Mercurial > pub > ImplabNet

annotate Implab/Promise.cs @ 71:1714fd8678ef

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
code cleanup
author cin
date Wed, 03 Sep 2014 18:34:02 +0400
parents 790e8a997d30
children d67b95eddaf4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
aa367305156b small fixes
cin
parents: 1
diff changeset
1 using System;
aa367305156b small fixes
cin
parents: 1
diff changeset
2 using System.Collections.Generic;
aa367305156b small fixes
cin
parents: 1
diff changeset
3 using System.Reflection;
aa367305156b small fixes
cin
parents: 1
diff changeset
4 using System.Diagnostics;
aa367305156b small fixes
cin
parents: 1
diff changeset
5 using System.Threading;
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
6 using Implab.Parallels;
2
aa367305156b small fixes
cin
parents: 1
diff changeset
7
aa367305156b small fixes
cin
parents: 1
diff changeset
8 namespace Implab {
aa367305156b small fixes
cin
parents: 1
diff changeset
9
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
10 public delegate void ErrorHandler(Exception e);
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
11 public delegate T ErrorHandler<out T>(Exception e);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
12 public delegate void ResultHandler<in T>(T result);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
13 public delegate TNew ResultMapper<in TSrc, out TNew>(TSrc result);
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
14 public delegate IPromise<TNew> ChainedOperation<in TSrc, TNew>(TSrc result);
2
aa367305156b small fixes
cin
parents: 1
diff changeset
15
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
16 /// <summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
17 /// Класс для асинхронного получения результатов. Так называемое "обещание".
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
18 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
19 /// <typeparam name="T">Тип получаемого результата</typeparam>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
20 /// <remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
21 /// <para>Сервис при обращении к его методу дает обещаиние о выполнении операции,
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
22 /// клиент получив такое обещание может установить ряд обратных вызово для получения
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
23 /// событий выполнения обещания, тоесть завершения операции и предоставлении результатов.</para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
24 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
25 /// Обещение может быть как выполнено, так и выполнено с ошибкой. Для подписки на
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
26 /// данные события клиент должен использовать методы <c>Then</c>.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
27 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
28 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
29 /// Сервис, в свою очередь, по окончанию выполнения операции (возможно с ошибкой),
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
30 /// использует методы <c>Resolve</c> либо <c>Reject</c> для оповещения клиетна о
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
31 /// выполнении обещания.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
32 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
33 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
34 /// Если сервер успел выполнить обещание еще до того, как клиент на него подписался,
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
35 /// то в момент подписки клиента будут вызваны соответсвующие события в синхронном
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
36 /// режиме и клиент будет оповещен в любом случае. Иначе, обработчики добавляются в
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
37 /// список в порядке подписания и в этом же порядке они будут вызваны при выполнении
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
38 /// обещания.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
39 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
40 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
41 /// Обрабатывая результаты обещания можно преобразовывать результаты либо инициировать
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
42 /// связанные асинхронные операции, которые также возвращают обещания. Для этого следует
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
43 /// использовать соответствующую форму методе <c>Then</c>.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
44 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
45 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
46 /// Также хорошим правилом является то, что <c>Resolve</c> и <c>Reject</c> должен вызывать
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
47 /// только инициатор обещания иначе могут возникнуть противоречия.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
48 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
49 /// </remarks>
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
50 public class Promise<T> : IPromise<T> {
2
aa367305156b small fixes
cin
parents: 1
diff changeset
51
28
cin
parents: 27
diff changeset
52 protected struct HandlerDescriptor {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
53 public ResultHandler<T> resultHandler;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
54 public ErrorHandler errorHandler;
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
55 public Action cancellHandler;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
56
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
57 public void Resolve(T result) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
58 if (resultHandler != null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
59 try {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
60 resultHandler(result);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
61 } catch (Exception e) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
62 Reject(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
63 }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
64 }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
65
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
66 public void Reject(Exception err) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
67 if (errorHandler != null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
68 try {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
69 errorHandler(err);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
70 } catch {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
71 }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
72 }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
73
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
74 public void Cancel() {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
75 if (cancellHandler != null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
76 try {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
77 cancellHandler();
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
78 } catch {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
79 }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
80 }
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
81 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
82
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
83 const int UNRESOLVED_SATE = 0;
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
84 const int TRANSITIONAL_STATE = 1;
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
85 const int SUCCEEDED_STATE = 2;
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
86 const int REJECTED_STATE = 3;
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
87 const int CANCELLED_STATE = 4;
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
88
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
89 readonly bool m_cancellable;
9
cin
parents: 7
diff changeset
90
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
91 int m_childrenCount = 0;
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
92 int m_state;
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
93 T m_result;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
94 Exception m_error;
9
cin
parents: 7
diff changeset
95
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
96 readonly MTQueue<HandlerDescriptor> m_handlers = new MTQueue<HandlerDescriptor>();
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
97
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
98 public Promise() {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
99 m_cancellable = true;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
100 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
101
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
102 public Promise(IPromise parent, bool cancellable) {
7
7ea9363fef6c inital progress handling
cin
parents: 6
diff changeset
103 m_cancellable = cancellable;
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
104 if (parent != null)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
105 AddHandler(
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
106 null,
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
107 null,
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
108 () => {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
109 if (parent.IsExclusive)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
110 parent.Cancel();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
111 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
112 );
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
113 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
114
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
115 bool BeginTransit() {
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
116 return UNRESOLVED_SATE == Interlocked.CompareExchange(ref m_state, TRANSITIONAL_STATE, UNRESOLVED_SATE);
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
117 }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
118
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
119 void CompleteTransit(int state) {
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
120 if (TRANSITIONAL_STATE != Interlocked.CompareExchange(ref m_state, state, TRANSITIONAL_STATE))
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
121 throw new InvalidOperationException("Can't complete transition when the object isn't in the transitional state");
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
122 }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
123
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
124 void WaitTransition() {
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
125 while (m_state == TRANSITIONAL_STATE) {
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
126 /* noop */
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
127 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
128 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
129
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
130 public bool IsResolved {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
131 get {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
132 return m_state > 1;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
133 }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
134 }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
135
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
136 public bool IsCancelled {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
137 get {
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
138 return m_state == CANCELLED_STATE;
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
139 }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
140 }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
141
29
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
142 public Type PromiseType {
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
143 get { return typeof(T); }
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
144 }
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
145
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
146 /// <summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
147 /// Выполняет обещание, сообщая об успешном выполнении.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
148 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
149 /// <param name="result">Результат выполнения.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
150 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
151 public void Resolve(T result) {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
152 if (BeginTransit()) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
153 m_result = result;
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
154 CompleteTransit(SUCCEEDED_STATE);
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
155 OnStateChanged();
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
156 } else {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
157 WaitTransition();
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
158 if (m_state != CANCELLED_STATE)
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
159 throw new InvalidOperationException("The promise is already resolved");
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
160 }
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
161 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
162
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
163 /// <summary>
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
164 /// Выполняет обещание, сообщая об успешном выполнении. Результатом выполнения будет пустое значения.
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
165 /// </summary>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
166 /// <remarks>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
167 /// Данный вариант удобен в случаях, когда интересен факт выполнения операции, нежели полученное значение.
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
168 /// </remarks>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
169 public void Resolve() {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
170 Resolve(default(T));
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
171 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
172
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
173 /// <summary>
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
174 /// Выполняет обещание, сообщая об ошибке
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
175 /// </summary>
16
cin
parents: 15
diff changeset
176 /// <remarks>
cin
parents: 15
diff changeset
177 /// Поскольку обещание должно работать в многопточной среде, при его выполнении сразу несколько потоков
cin
parents: 15
diff changeset
178 /// могу вернуть ошибку, при этом только первая будет использована в качестве результата, остальные
cin
parents: 15
diff changeset
179 /// будут проигнорированы.
cin
parents: 15
diff changeset
180 /// </remarks>
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
181 /// <param name="error">Исключение возникшее при выполнении операции</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
182 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
183 public void Reject(Exception error) {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
184 if (BeginTransit()) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
185 m_error = error;
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
186 CompleteTransit(REJECTED_STATE);
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
187 OnStateChanged();
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
188 } else {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
189 WaitTransition();
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
190 if (m_state == SUCCEEDED_STATE)
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
191 throw new InvalidOperationException("The promise is already resolved");
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
192 }
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
193 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
194
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
195 /// <summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
196 /// Отменяет операцию, если это возможно.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
197 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
198 /// <returns><c>true</c> Операция была отменена, обработчики не будут вызваны.<c>false</c> отмена не возможна, поскольку обещание уже выполнено и обработчики отработали.</returns>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
199 public bool Cancel() {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
200 if (BeginTransit()) {
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
201 CompleteTransit(CANCELLED_STATE);
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
202 OnStateChanged();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
203 return true;
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
204 } else {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
205 return false;
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
206 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
207 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
208
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
209 // сделано для возвращаемого типа void
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
210 protected void InternalCancel() {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
211 Cancel();
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
212 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
213
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
214 /// <summary>
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
215 /// Adds new handlers to this promise.
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
216 /// </summary>
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
217 /// <param name="success">The handler of the successfully completed operation.
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
218 /// This handler will recieve an operation result as a parameter.</param>
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
219 /// <param name="error">Handles an exception that may occur during the operation.</param>
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
220 /// <returns>The new promise chained to this one.</returns>
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
221 public IPromise<T> Then(ResultHandler<T> success, ErrorHandler error) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
222 if (success == null && error == null)
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
223 return this;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
224
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
225 var medium = new Promise<T>(this, true);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
226
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
227 ResultHandler<T> resultHandler;
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
228 if (success != null)
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
229 resultHandler = x => {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
230 success(x);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
231 medium.Resolve(x);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
232 };
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
233 else
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
234 resultHandler = medium.Resolve;
2
aa367305156b small fixes
cin
parents: 1
diff changeset
235
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
236 ErrorHandler errorHandler;
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
237 if (error != null)
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
238 errorHandler = x => {
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
239 // несмотря на то, что обработчик ошибки вызывается безопасно,
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
240 // т.е. возникшие в нем ошибки будут подавлены, нам нужно
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
241 // гарантировать, что ошибка будет передана дальше по цепочке обещаний
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
242 try {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
243 error(x);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
244 } catch { }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
245 medium.Reject(x);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
246 };
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
247 else
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
248 errorHandler = medium.Reject;
2
aa367305156b small fixes
cin
parents: 1
diff changeset
249
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
250 AddHandler(resultHandler, errorHandler, medium.InternalCancel);
2
aa367305156b small fixes
cin
parents: 1
diff changeset
251
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
252 return medium;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
253 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
254
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
255 public IPromise Then(Action success, ErrorHandler error) {
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
256 return Then(x => success(), error);
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
257 }
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
258
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
259 public IPromise Then(Action success) {
32
8eca2652d2ff fixed: StackOverflow in IPromiseBase.Then(handler)
cin
parents: 30
diff changeset
260 return Then(x => success());
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
261 }
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
262
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
263 /// <summary>
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
264 /// Adds new handlers to this promise.
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
265 /// </summary>
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
266 /// <param name="success">The handler of the successfully completed operation.
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
267 /// This handler will recieve an operation result as a parameter.</param>
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
268 /// <param name="error">Handles an exception that may occur during the operation and returns the value which will be used as the result of the operation.</param>
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
269 /// <returns>The new promise chained to this one.</returns>
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
270 public IPromise<T> Then(ResultHandler<T> success, ErrorHandler<T> error) {
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
271 if (success == null && error == null)
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
272 return this;
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
273
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
274 var medium = new Promise<T>(this, true);
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
275
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
276 ResultHandler<T> resultHandler;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
277 ErrorHandler errorHandler;
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
278
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
279 if (success != null)
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
280 resultHandler = x => {
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
281 success(x);
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
282 medium.Resolve(x);
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
283 };
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
284 else
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
285 resultHandler = medium.Resolve;
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
286
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
287 if (error != null)
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
288 errorHandler = x => {
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
289 try {
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
290 medium.Resolve(error(x));
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
291 } catch (Exception e) {
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
292 medium.Reject(e);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
293 }
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
294 };
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
295 else
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
296 errorHandler = medium.Reject;
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
297
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
298 AddHandler(resultHandler, errorHandler, medium.InternalCancel);
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
299
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
300 return medium;
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
301 }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
302
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
303
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
304 public IPromise<T> Then(ResultHandler<T> success) {
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
305 if (success == null)
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
306 return this;
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
307
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
308 var medium = new Promise<T>(this, true);
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
309
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
310 ResultHandler<T> resultHandler;
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
311
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
312 if (success != null)
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
313 resultHandler = x => {
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
314 success(x);
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
315 medium.Resolve(x);
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
316 };
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
317 else
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
318 resultHandler = medium.Resolve;
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
319
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
320 AddHandler(resultHandler, medium.Reject, medium.InternalCancel);
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
321
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
322 return medium;
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
323 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
324
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
325 public IPromise<T> Error(ErrorHandler error) {
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
326 return Then((ResultHandler<T>)null, error);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
327 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
328
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
329 /// <summary>
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
330 /// Handles error and allows to keep the promise.
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
331 /// </summary>
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
332 /// <remarks>
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
333 /// If the specified handler throws an exception, this exception will be used to reject the promise.
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
334 /// </remarks>
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
335 /// <param name="handler">The error handler which returns the result of the promise.</param>
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
336 /// <returns>New promise.</returns>
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
337 public IPromise<T> Error(ErrorHandler<T> handler) {
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
338 if (handler == null)
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
339 return this;
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
340
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
341 var medium = new Promise<T>(this, true);
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
342
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
343 AddHandler(
27
cin
parents: 26
diff changeset
344 x => medium.Resolve(x),
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
345 e => {
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
346 try {
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
347 medium.Resolve(handler(e));
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
348 } catch (Exception e2) {
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
349 medium.Reject(e2);
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
350 }
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
351 },
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
352 medium.InternalCancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
353 );
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
354
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
355 return medium;
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
356 }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
357
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
358 public IPromise<T> Anyway(Action handler) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
359 if (handler == null)
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
360 return this;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
361
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
362 var medium = new Promise<T>(this,true);
2
aa367305156b small fixes
cin
parents: 1
diff changeset
363
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
364 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
365 x => {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
366 // to avoid handler being called multiple times we handle exception by ourselfs
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
367 try {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
368 handler();
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
369 medium.Resolve(x);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
370 } catch (Exception e) {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
371 medium.Reject(e);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
372 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
373 },
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
374
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
375 e => {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
376 try {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
377 handler();
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
378 } catch { }
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
379 medium.Reject(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
380 },
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
381
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
382 medium.InternalCancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
383 );
2
aa367305156b small fixes
cin
parents: 1
diff changeset
384
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
385 return medium;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
386 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
387
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
388 /// <summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
389 /// Позволяет преобразовать результат выполения операции к новому типу.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
390 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
391 /// <typeparam name="TNew">Новый тип результата.</typeparam>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
392 /// <param name="mapper">Преобразование результата к новому типу.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
393 /// <param name="error">Обработчик ошибки. Данный обработчик получит
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
394 /// исключение возникшее при выполнении операции.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
395 /// <returns>Новое обещание, которое будет выполнено при выполнении исходного обещания.</returns>
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
396 public IPromise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper, ErrorHandler error) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
397 if (mapper == null)
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
398 throw new ArgumentNullException("mapper");
2
aa367305156b small fixes
cin
parents: 1
diff changeset
399
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
400 // создаем прицепленное обещание
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
401 var chained = new Promise<TNew>(this,true);
2
aa367305156b small fixes
cin
parents: 1
diff changeset
402
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
403 ResultHandler<T> resultHandler = result => chained.Resolve(mapper(result));
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
404 ErrorHandler errorHandler = delegate(Exception e) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
405 if (error != null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
406 try {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
407 error(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
408 } catch { }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
409 // в случае ошибки нужно передать исключение дальше по цепочке
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
410 chained.Reject(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
411 };
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
412
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
413
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
414 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
415 resultHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
416 errorHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
417 chained.InternalCancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
418 );
2
aa367305156b small fixes
cin
parents: 1
diff changeset
419
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
420 return chained;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
421 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
422
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
423 public IPromise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
424 return Map(mapper, null);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
425 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
426
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
427 /// <summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
428 /// Сцепляет несколько аснхронных операций. Указанная асинхронная операция будет вызвана после
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
429 /// выполнения текущей, а результат текущей операции может быть использован для инициализации
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
430 /// новой операции.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
431 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
432 /// <typeparam name="TNew">Тип результата указанной асинхронной операции.</typeparam>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
433 /// <param name="chained">Асинхронная операция, которая должна будет начаться после выполнения текущей.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
434 /// <param name="error">Обработчик ошибки. Данный обработчик получит
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
435 /// исключение возникшее при выполнении текуещй операции.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
436 /// <returns>Новое обещание, которое будет выполнено по окончанию указанной аснхронной операции.</returns>
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
437 public IPromise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained, ErrorHandler error) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
438
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
439 // проблема в том, что на момент связывания еще не начата асинхронная операция, поэтому нужно
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
440 // создать посредника, к которому будут подвызяваться следующие обработчики.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
441 // когда будет выполнена реальная асинхронная операция, она обратиться к посреднику, чтобы
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
442 // передать через него результаты работы.
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
443 var medium = new Promise<TNew>(this, true);
2
aa367305156b small fixes
cin
parents: 1
diff changeset
444
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
445 ResultHandler<T> resultHandler = delegate(T result) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
446 if (medium.IsCancelled)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
447 return;
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
448
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
449 var promise = chained(result);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
450
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
451 promise.Then(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
452 x => medium.Resolve(x),
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
453 e => medium.Reject(e)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
454 );
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
455
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
456 // notify chained operation that it's not needed anymore
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
457 // порядок вызова Then, Cancelled важен, поскольку от этого
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
458 // зависит IsExclusive
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
459 medium.Cancelled(() => {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
460 if(promise.IsExclusive)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
461 promise.Cancel();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
462 });
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
463
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
464 // внешняя отмена связанной операции рассматривается как ошибка
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
465 promise.Cancelled(() => medium.Reject(new OperationCanceledException()));
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
466 };
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
467
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
468 ErrorHandler errorHandler = delegate(Exception e) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
469 if (error != null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
470 error(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
471 // в случае ошибки нужно передать исключение дальше по цепочке
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
472 medium.Reject(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
473 };
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
474
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
475 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
476 resultHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
477 errorHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
478 medium.InternalCancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
479 );
2
aa367305156b small fixes
cin
parents: 1
diff changeset
480
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
481 return medium;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
482 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
483
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
484 public IPromise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
485 return Chain(chained, null);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
486 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
487
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
488 public IPromise<T> Cancelled(Action handler) {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
489 AddHandler(null, null, handler);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
490 return this;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
491 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
492
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
493 /// <summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
494 /// Adds the specified handler for all cases (success, error, cancel)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
495 /// </summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
496 /// <param name="handler">The handler that will be called anyway</param>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
497 /// <returns>self</returns>
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
498 public IPromise<T> Finally(Action handler) {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
499 if (handler == null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
500 throw new ArgumentNullException("handler");
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
501 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
502 x => handler(),
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
503 e => handler(),
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
504 handler
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
505 );
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
506 return this;
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
507 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
508
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
509 /// <summary>
29
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
510 /// Преобразует результат обещания к нужному типу
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
511 /// </summary>
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
512 /// <typeparam name="T2"></typeparam>
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
513 /// <returns></returns>
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
514 public IPromise<T2> Cast<T2>() {
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
515 return Map(x => (T2)(object)x, null);
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
516 }
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
517
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
518 /// <summary>
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
519 /// Дожидается отложенного обещания и в случае успеха, возвращает
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
520 /// его, результат, в противном случае бросает исключение.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
521 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
522 /// <remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
523 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
524 /// Если ожидание обещания было прервано по таймауту, это не значит,
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
525 /// что обещание было отменено или что-то в этом роде, это только
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
526 /// означает, что мы его не дождались, однако все зарегистрированные
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
527 /// обработчики, как были так остались и они будут вызваны, когда
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
528 /// обещание будет выполнено.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
529 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
530 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
531 /// Такое поведение вполне оправдано поскольку таймаут может истечь
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
532 /// в тот момент, когда началась обработка цепочки обработчиков, и
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
533 /// к тому же текущее обещание может стоять в цепочке обещаний и его
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
534 /// отклонение может привести к непрогнозируемому результату.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
535 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
536 /// </remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
537 /// <param name="timeout">Время ожидания</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
538 /// <returns>Результат выполнения обещания</returns>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
539 public T Join(int timeout) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
540 var evt = new ManualResetEvent(false);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
541 Anyway(() => evt.Set());
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
542 Cancelled(() => evt.Set());
2
aa367305156b small fixes
cin
parents: 1
diff changeset
543
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
544 if (!evt.WaitOne(timeout, true))
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
545 throw new TimeoutException();
2
aa367305156b small fixes
cin
parents: 1
diff changeset
546
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
547 switch (m_state) {
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
548 case SUCCEEDED_STATE:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
549 return m_result;
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
550 case CANCELLED_STATE:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
551 throw new OperationCanceledException();
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
552 case REJECTED_STATE:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
553 throw new TargetInvocationException(m_error);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
554 default:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
555 throw new ApplicationException(String.Format("Invalid promise state {0}", m_state));
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
556 }
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
557 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
558
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
559 public T Join() {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
560 return Join(Timeout.Infinite);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
561 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
562
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
563 void AddHandler(ResultHandler<T> success, ErrorHandler error, Action cancel) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
564 if (success != null || error != null)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
565 Interlocked.Increment(ref m_childrenCount);
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
566
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
567 HandlerDescriptor handler = new HandlerDescriptor {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
568 resultHandler = success,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
569 errorHandler = error,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
570 cancellHandler = cancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
571 };
2
aa367305156b small fixes
cin
parents: 1
diff changeset
572
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
573 bool queued;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
574
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
575 if (!IsResolved) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
576 m_handlers.Enqueue(handler);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
577 queued = true;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
578 } else {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
579 // the promise is in resolved state, just invoke the handled with minimum overhead
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
580 queued = false;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
581 InvokeHandler(handler);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
582 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
583
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
584 if (queued && IsResolved && m_handlers.TryDequeue(out handler))
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
585 // if the promise have been resolved while we was adding handler to the queue
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
586 // we can't guarantee that someone is still processing it
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
587 // therefore we will fetch a handler from the queue and execute it
27
cin
parents: 26
diff changeset
588 // note that fetched handler may be not the one that we have added
cin
parents: 26
diff changeset
589 // even we can fetch no handlers at all :)
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
590 InvokeHandler(handler);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
591 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
592
27
cin
parents: 26
diff changeset
593 protected virtual void InvokeHandler(HandlerDescriptor handler) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
594 switch (m_state) {
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
595 case SUCCEEDED_STATE:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
596 handler.Resolve(m_result);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
597 break;
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
598 case REJECTED_STATE:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
599 handler.Reject(m_error);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
600 break;
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
601 case CANCELLED_STATE:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
602 handler.Cancel();
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
603 break;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
604 default:
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
605 // do nothing
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
606 return;
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
607 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
608 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
609
65
653c4e04968b minor changes
cin
parents: 33
diff changeset
610 void OnStateChanged() {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
611 HandlerDescriptor handler;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
612 while (m_handlers.TryDequeue(out handler))
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
613 InvokeHandler(handler);
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
614 }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
615
9
cin
parents: 7
diff changeset
616 public bool IsExclusive {
cin
parents: 7
diff changeset
617 get {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
618 return m_childrenCount <= 1;
9
cin
parents: 7
diff changeset
619 }
cin
parents: 7
diff changeset
620 }
cin
parents: 7
diff changeset
621
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
622 /// <summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
623 /// Объединяет несколько обещаний в одно, результатом которого является массив результатов других обещаний.
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
624 /// Если хотябы одно из переданных обещаний не будет выполнено, то новое обещение тоже не будет выполнено.
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
625 /// При отмене нового обещания, переданные обещания также будут отменены, если никто больше на них не подписан.
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
626 /// </summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
627 /// <param name="promises">Список обещаний. Если список пустой, то результирующее обещание возвращается уже выполненным.</param>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
628 /// <returns>Обещание объединяющее в себе результат переданных обещаний.</returns>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
629 /// <exception cref="ArgumentNullException"><paramref name="promises"/> не может быть null</exception>
30
2fad2d1f4b03 small refactoring, cleanup.
cin
parents: 29
diff changeset
630 public static IPromise<T[]> CreateComposite(IList<IPromise<T>> promises) {
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
631 if (promises == null)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
632 throw new ArgumentNullException();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
633
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
634 // создаем аккумулятор для результатов и результирующее обещание
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
635 var result = new T[promises.Count];
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
636 var promise = new Promise<T[]>();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
637
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
638 // special case
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
639 if (promises.Count == 0) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
640 promise.Resolve(result);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
641 return promise;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
642 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
643
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
644 int pending = promises.Count;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
645
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
646 for (int i = 0; i < promises.Count; i++) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
647 var dest = i;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
648
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
649 if (promises[i] != null) {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
650 promises[i].Then(
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
651 x => {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
652 result[dest] = x;
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
653 if (Interlocked.Decrement(ref pending) == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
654 promise.Resolve(result);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
655 },
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
656 e => promise.Reject(e)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
657 );
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
658 } else {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
659 if (Interlocked.Decrement(ref pending) == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
660 promise.Resolve(result);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
661 }
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
662 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
663
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
664 promise.Cancelled(
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
665 () => {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
666 foreach (var d in promises)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
667 if (d != null && d.IsExclusive)
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
668 d.Cancel();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
669 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
670 );
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
671
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
672 return promise;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
673 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
674
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
675 /// <summary>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
676 /// Объединяет несколько обещаний в одно. Результирующее обещание будет выполнено при
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
677 /// выполнении всех указанных обещаний. При этом возвращаемые значения первичных обещаний
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
678 /// игнорируются.
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
679 /// </summary>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
680 /// <param name="promises">Коллекция первичных обещаний, которые будут объеденены в одно.</param>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
681 /// <returns>Новое обещание, объединяющее в себе переданные.</returns>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
682 /// <remarks>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
683 /// Если в коллекции встречаюься <c>null</c>, то они воспринимаются как выполненные обещания.
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
684 /// </remarks>
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
685 public static IPromise CreateComposite(ICollection<IPromise> promises) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
686 if (promises == null)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
687 throw new ArgumentNullException();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
688 if (promises.Count == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
689 return Promise<object>.ResultToPromise(null);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
690
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
691 int countdown = promises.Count;
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
692
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
693 var result = new Promise<object>();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
694
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
695 foreach (var d in promises) {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
696 if (d == null) {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
697 if (Interlocked.Decrement(ref countdown) == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
698 result.Resolve(null);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
699 } else {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
700 d.Then(() => {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
701 if (Interlocked.Decrement(ref countdown) == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
702 result.Resolve(null);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
703 });
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
704 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
705 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
706
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
707 result.Cancelled(() => {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
708 foreach (var d in promises)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
709 if (d != null && d.IsExclusive)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
710 d.Cancel();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
711 });
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
712
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
713 return result;
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
714 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
715
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
716 public static Promise<T> ResultToPromise(T result) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
717 var p = new Promise<T>();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
718 p.Resolve(result);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
719 return p;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
720 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
721
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
722 public static Promise<T> ExceptionToPromise(Exception error) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
723 if (error == null)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
724 throw new ArgumentNullException();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
725
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
726 var p = new Promise<T>();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
727 p.Reject(error);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
728 return p;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
729 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
730
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
731 #region IPromiseBase explicit implementation
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
732
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
733 IPromise IPromise.Error(ErrorHandler error) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
734 return Error(error);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
735 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
736
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
737 IPromise IPromise.Anyway(Action handler) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
738 return Anyway(handler);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
739 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
740
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
741 IPromise IPromise.Finally(Action handler) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
742 return Finally(handler);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
743 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
744
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
745 IPromise IPromise.Cancelled(Action handler) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
746 return Cancelled(handler);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
747 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
748
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
749 void IPromise.Join() {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
750 Join();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
751 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
752
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
753 void IPromise.Join(int timeout) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
754 Join(timeout);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
755 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
756
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
757 #endregion
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
758
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
759
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
760
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
761 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
762 }