Mercurial > pub > ImplabNet
annotate Implab/AbstractPromiseT.cs @ 209:a867536c68fc v2
Bound promise to CancellationToken
Added new states to ExecutionSate enum.
Added Safe.Guard() method to handle cleanup of the result of the promise
| author | cin |
|---|---|
| date | Wed, 16 Nov 2016 03:06:08 +0300 |
| parents | 86187b01c4e0 |
| children | cbe10ac0731e |
| rev | line source |
|---|---|
| 144 | 1 using System; |
| 2 using Implab.Parallels; | |
| 3 | |
| 4 namespace Implab { | |
| 5 public abstract class AbstractPromise<T> : AbstractEvent<AbstractPromise<T>.HandlerDescriptor>, IPromise<T> { | |
| 6 public struct HandlerDescriptor { | |
| 7 readonly Action m_handler; | |
| 8 readonly Action<T> m_success; | |
| 9 readonly Action<Exception> m_error; | |
| 10 readonly Action<Exception> m_cancel; | |
| 11 readonly PromiseEventType m_mask; | |
| 12 | |
| 13 public HandlerDescriptor(Action<T> success, Action<Exception> error, Action<Exception> cancel) { | |
| 14 m_success = success; | |
| 15 m_error = error; | |
| 16 m_cancel = cancel; | |
| 145 | 17 |
| 18 m_handler = null; | |
| 19 m_mask = 0; | |
| 144 | 20 } |
| 21 | |
| 22 public HandlerDescriptor(Action success, Action<Exception> error, Action<Exception> cancel) { | |
| 23 m_handler = success; | |
| 145 | 24 m_success = null; |
| 144 | 25 m_error = error; |
| 26 m_cancel = cancel; | |
| 27 m_mask = PromiseEventType.Success; | |
| 28 } | |
| 29 | |
| 30 public HandlerDescriptor(Action handler, PromiseEventType mask) { | |
| 31 m_handler = handler; | |
| 32 m_mask = mask; | |
| 145 | 33 m_success = null; |
| 34 m_error = null; | |
| 35 m_cancel = null; | |
| 144 | 36 } |
| 37 | |
| 38 public void SignalSuccess(T result) { | |
| 39 if (m_success != null) { | |
| 40 try { | |
| 41 m_success(result); | |
|
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42 // Analysis disable once EmptyGeneralCatchClause |
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43 } catch { |
| 144 | 44 } |
| 145 | 45 } else if ((m_mask & PromiseEventType.Success) != 0 && m_handler != null) { |
| 144 | 46 try { |
| 47 m_handler(); | |
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48 // Analysis disable once EmptyGeneralCatchClause |
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49 } catch { |
| 144 | 50 } |
| 51 } | |
| 52 } | |
| 53 | |
| 54 public void SignalError(Exception err) { | |
| 55 if (m_error != null) { | |
| 56 try { | |
| 57 m_error(err); | |
| 58 // Analysis disable once EmptyGeneralCatchClause | |
| 59 } catch { | |
| 60 } | |
| 145 | 61 } else if ((m_mask & PromiseEventType.Error) != 0 && m_handler != null) { |
| 144 | 62 try { |
| 63 m_handler(); | |
| 64 // Analysis disable once EmptyGeneralCatchClause | |
| 65 } catch { | |
| 66 } | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 public void SignalCancel(Exception reason) { | |
| 71 if (m_cancel != null) { | |
| 72 try { | |
| 73 m_cancel(reason); | |
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74 // Analysis disable once EmptyGeneralCatchClause |
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75 } catch { |
| 144 | 76 } |
| 145 | 77 } else if ((m_mask & PromiseEventType.Cancelled) != 0 && m_handler != null) { |
| 144 | 78 try { |
| 79 m_handler(); | |
| 80 // Analysis disable once EmptyGeneralCatchClause | |
| 81 } catch { | |
| 82 } | |
| 83 } | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 public Type PromiseType { | |
| 88 get { | |
| 89 return typeof(T); | |
| 90 } | |
| 91 } | |
| 92 | |
| 145 | 93 public T Join() { |
| 144 | 94 WaitResult(-1); |
| 95 return m_result; | |
| 96 } | |
| 145 | 97 public T Join(int timeout) { |
| 144 | 98 WaitResult(timeout); |
| 99 return m_result; | |
| 100 } | |
| 101 | |
| 145 | 102 void IPromise.Join() { |
| 103 WaitResult(-1); | |
| 104 } | |
| 105 void IPromise.Join(int timeout) { | |
| 106 WaitResult(timeout); | |
| 107 } | |
| 108 | |
| 144 | 109 public IPromise<T> On(Action<T> success, Action<Exception> error, Action<Exception> cancel) { |
| 110 AddHandler(new HandlerDescriptor(success, error, cancel)); | |
| 111 return this; | |
| 112 } | |
| 113 | |
| 114 public IPromise<T> On(Action<T> success, Action<Exception> error) { | |
| 115 AddHandler(new HandlerDescriptor(success, error, null)); | |
| 116 return this; | |
| 117 } | |
| 118 | |
| 119 public IPromise<T> On(Action<T> success) { | |
| 120 AddHandler(new HandlerDescriptor(success, null, null)); | |
| 121 return this; | |
| 122 } | |
| 123 | |
| 124 public IPromise<T> On(Action handler, PromiseEventType events) { | |
| 125 AddHandler(new HandlerDescriptor(handler, events)); | |
| 126 return this; | |
| 127 } | |
| 128 | |
| 129 public IPromise<T> On(Action success, Action<Exception> error, Action<Exception> cancel) { | |
| 130 AddHandler(new HandlerDescriptor(success, error, cancel)); | |
| 131 return this; | |
| 132 } | |
| 133 | |
| 134 public IPromise<T> On(Action success, Action<Exception> error) { | |
| 135 AddHandler(new HandlerDescriptor(success, error, null)); | |
| 136 return this; | |
| 137 } | |
| 138 | |
| 139 public IPromise<T> On(Action success) { | |
| 140 AddHandler(new HandlerDescriptor(success, null, null)); | |
| 141 return this; | |
| 142 } | |
| 143 | |
| 144 IPromise IPromise.On(Action success, Action<Exception> error, Action<Exception> cancel) { | |
| 145 AddHandler(new HandlerDescriptor(success, error, cancel)); | |
| 146 return this; | |
| 147 } | |
| 148 | |
| 149 IPromise IPromise.On(Action success, Action<Exception> error) { | |
| 150 AddHandler(new HandlerDescriptor(success, error, null)); | |
| 151 return this; | |
| 152 } | |
| 153 | |
| 154 IPromise IPromise.On(Action success) { | |
| 155 AddHandler(new HandlerDescriptor(success, null, null)); | |
| 156 return this; | |
| 157 } | |
| 158 | |
| 145 | 159 IPromise IPromise.On(Action handler, PromiseEventType events) { |
| 160 AddHandler(new HandlerDescriptor(handler, events)); | |
| 161 return this; | |
| 162 } | |
| 163 | |
| 144 | 164 public IPromise<T2> Cast<T2>() { |
| 165 return (IPromise<T2>)this; | |
| 166 } | |
| 167 | |
| 168 #region implemented abstract members of AbstractPromise | |
| 169 | |
| 170 protected override Signal GetResolveSignal() { | |
| 171 var signal = new Signal(); | |
| 172 AddHandler(new HandlerDescriptor(signal.Set, PromiseEventType.All)); | |
| 173 return signal; | |
| 174 } | |
| 175 | |
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176 protected override void SignalHandler(HandlerDescriptor handler, int signal) { |
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177 switch (signal) { |
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178 case SUCCEEDED_STATE: |
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179 handler.SignalSuccess(m_result); |
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180 break; |
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181 case REJECTED_STATE: |
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182 handler.SignalError(Error); |
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183 break; |
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184 case CANCELLED_STATE: |
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185 handler.SignalCancel(CancellationReason); |
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186 break; |
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187 default: |
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188 throw new InvalidOperationException(String.Format("Invalid promise signal: {0}", signal)); |
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189 } |
| 144 | 190 } |
| 191 | |
| 192 #endregion | |
| 193 | |
| 194 T m_result; | |
| 195 | |
| 196 protected void SetResult(T value) { | |
| 197 if (BeginSetResult()) { | |
| 198 m_result = value; | |
| 199 EndSetResult(); | |
| 200 } | |
| 201 } | |
| 202 } | |
| 203 } | |
| 204 |