Mercurial > pub > ImplabNet

annotate Implab/Components/RunnableComponent.cs @ 238:bdfdba6b645b v2

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fixed unpredictable Safe.Dispose behaviour
author cin
date Fri, 01 Dec 2017 01:28:56 +0300
parents 5dc21f6a3222
children eee3e49dd1ff
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 using System;
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2 using System.Diagnostics.CodeAnalysis;
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3
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4 namespace Implab.Components {
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5 public abstract class RunnableComponent : IDisposable, IRunnable, IInitializable {
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6 enum Commands {
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7 Ok = 0,
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8 Fail,
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9 Init,
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10 Start,
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11 Stop,
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12 Dispose,
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13 Reset,
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14 Last = Reset
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15 }
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16
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17 class StateMachine {
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18 public static readonly ExecutionState[,] ReusableTransitions;
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19 public static readonly ExecutionState[,] NonreusableTransitions;
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20
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21 class StateBuilder {
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22 readonly ExecutionState[,] m_states;
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23
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24 public ExecutionState[,] States {
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25 get { return m_states; }
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26 }
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27 public StateBuilder(ExecutionState[,] states) {
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28 m_states = states;
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29 }
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30
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31 public StateBuilder() {
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32 m_states = new ExecutionState[(int)ExecutionState.Last + 1, (int)Commands.Last + 1];
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33 }
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34
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35 public StateBuilder Edge(ExecutionState s1, ExecutionState s2, Commands cmd) {
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36 m_states[(int)s1, (int)cmd] = s2;
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37 return this;
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38 }
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39
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40 public StateBuilder Clone() {
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41 return new StateBuilder((ExecutionState[,])m_states.Clone());
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42 }
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43 }
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44
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45 static StateMachine() {
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46 ReusableTransitions = new ExecutionState[(int)ExecutionState.Last + 1, (int)Commands.Last + 1];
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47
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48 var common = new StateBuilder()
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49 .Edge(ExecutionState.Created, ExecutionState.Initializing, Commands.Init)
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50 .Edge(ExecutionState.Created, ExecutionState.Disposed, Commands.Dispose)
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51
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52 .Edge(ExecutionState.Initializing, ExecutionState.Ready, Commands.Ok)
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53 .Edge(ExecutionState.Initializing, ExecutionState.Failed, Commands.Fail)
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54
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55 .Edge(ExecutionState.Ready, ExecutionState.Starting, Commands.Start)
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56 .Edge(ExecutionState.Ready, ExecutionState.Disposed, Commands.Dispose)
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57
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58 .Edge(ExecutionState.Starting, ExecutionState.Running, Commands.Ok)
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59 .Edge(ExecutionState.Starting, ExecutionState.Failed, Commands.Fail)
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60 .Edge(ExecutionState.Starting, ExecutionState.Stopping, Commands.Stop)
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61 .Edge(ExecutionState.Starting, ExecutionState.Disposed, Commands.Dispose)
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62
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63 .Edge(ExecutionState.Running, ExecutionState.Failed, Commands.Fail)
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64 .Edge(ExecutionState.Running, ExecutionState.Stopping, Commands.Stop)
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65 .Edge(ExecutionState.Running, ExecutionState.Disposed, Commands.Dispose)
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66
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67 .Edge(ExecutionState.Failed, ExecutionState.Disposed, Commands.Dispose)
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68 .Edge(ExecutionState.Failed, ExecutionState.Initializing, Commands.Reset)
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69
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70 .Edge(ExecutionState.Stopping, ExecutionState.Failed, Commands.Fail)
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71 .Edge(ExecutionState.Stopping, ExecutionState.Disposed, Commands.Dispose)
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72
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73 .Edge(ExecutionState.Disposed, ExecutionState.Disposed, Commands.Dispose);
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74
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75 var reusable = common
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76 .Clone()
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77 .Edge(ExecutionState.Stopping, ExecutionState.Ready, Commands.Ok);
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78
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79 var nonreusable = common
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80 .Clone()
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81 .Edge(ExecutionState.Stopping, ExecutionState.Disposed, Commands.Ok);
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82
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83 NonreusableTransitions = nonreusable.States;
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84 ReusableTransitions = reusable.States;
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85
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86 }
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87
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88 readonly ExecutionState[,] m_states;
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89
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90 public ExecutionState State {
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91 get;
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92 private set;
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93 }
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94
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95 public StateMachine(ExecutionState[,] states, ExecutionState initial) {
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96 State = initial;
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97 m_states = states;
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98 }
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99
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100 public bool Move(Commands cmd) {
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101 var next = m_states[(int)State, (int)cmd];
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102 if (next == ExecutionState.Undefined)
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103 return false;
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104 State = next;
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105 return true;
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106 }
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107 }
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108
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109 IPromise m_pending;
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110 Exception m_lastError;
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111
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112 readonly StateMachine m_stateMachine;
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113 readonly bool m_reusable;
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114 public event EventHandler<StateChangeEventArgs> StateChanged;
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115
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116 /// <summary>
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117 /// Initializes component state.
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118 /// </summary>
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119 /// <param name="initialized">If set, the component initial state is <see cref="ExecutionState.Ready"/> and the component is ready to start, otherwise initialization is required.</param>
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120 /// <param name="reusable">If set, the component may start after it has been stopped, otherwise the component is disposed after being stopped.</param>
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121 protected RunnableComponent(bool initialized, bool reusable) {
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122 m_stateMachine = new StateMachine(
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123 reusable ? StateMachine.ReusableTransitions : StateMachine.NonreusableTransitions,
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124 initialized ? ExecutionState.Ready : ExecutionState.Created
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125 );
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126 m_reusable = reusable;
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127 }
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128
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129 /// <summary>
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130 /// Initializes component state. The component created with this constructor is not reusable, i.e. it will be disposed after stop.
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131 /// </summary>
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132 /// <param name="initialized">If set, the component initial state is <see cref="ExecutionState.Ready"/> and the component is ready to start, otherwise initialization is required.</param>
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133 protected RunnableComponent(bool initialized) : this(initialized, false) {
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134 }
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135
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136 void ThrowInvalidCommand(Commands cmd) {
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137 if (m_stateMachine.State == ExecutionState.Disposed)
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138 throw new ObjectDisposedException(ToString());
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139
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140 throw new InvalidOperationException(String.Format("Command {0} is not allowed in the state {1}", cmd, m_stateMachine.State));
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141 }
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142
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143 bool MoveIfInState(Commands cmd, IPromise pending, Exception error, ExecutionState state) {
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144 ExecutionState prev, current;
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145 lock (m_stateMachine) {
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146 if (m_stateMachine.State != state)
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147 return false;
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148
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149 prev = m_stateMachine.State;
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150 if (!m_stateMachine.Move(cmd))
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151 ThrowInvalidCommand(cmd);
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152 current = m_stateMachine.State;
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153
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154 m_pending = pending;
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155 m_lastError = error;
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156 }
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157 if (prev != current)
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158 OnStateChanged(prev, current, error);
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159 return true;
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160 }
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161
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162 bool MoveIfPending(Commands cmd, IPromise pending, Exception error, IPromise expected) {
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163 ExecutionState prev, current;
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164 lock (m_stateMachine) {
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165 if (m_pending != expected)
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166 return false;
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167 prev = m_stateMachine.State;
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168 if (!m_stateMachine.Move(cmd))
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169 ThrowInvalidCommand(cmd);
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170 current = m_stateMachine.State;
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171 m_pending = pending;
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172 m_lastError = error;
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173 }
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174 if (prev != current)
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175 OnStateChanged(prev, current, error);
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176 return true;
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177 }
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178
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179 IPromise Move(Commands cmd, IPromise pending, Exception error) {
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180 ExecutionState prev, current;
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181 IPromise ret;
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182 lock (m_stateMachine) {
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183 prev = m_stateMachine.State;
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184 if (!m_stateMachine.Move(cmd))
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185 ThrowInvalidCommand(cmd);
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186 current = m_stateMachine.State;
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187
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188 ret = m_pending;
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189 m_pending = pending;
210
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190 m_lastError = error;
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191
205
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192 }
210
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193 if (prev != current)
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194 OnStateChanged(prev, current, error);
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195 return ret;
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parents: 203
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196 }
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197
210
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198 /// <summary>
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199 /// Handles the state of the component change event, raises the <see cref="StateChanged"/> event, handles
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200 /// the transition to the <see cref="ExecutionState.Disposed"/> state (calls <see cref="Dispose(bool)"/> method).
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201 /// </summary>
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202 /// <param name="previous">The previous state</param>
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203 /// <param name="current">The current state</param>
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204 /// <param name="error">The last error if any.</param>
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205 /// <remarks>
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206 /// <para>
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207 /// If the previous state and the current state are same this method isn't called, such situiation is treated
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parents: 208
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208 /// as the component hasn't changed it's state.
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209 /// </para>
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210 /// <para>
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211 /// When overriding this method ensure the call is made to the base implementation, otherwise it will lead to
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212 /// the wrong behavior of the component.
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213 /// </para>
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214 /// </remarks>
205
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parents: 203
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215 protected virtual void OnStateChanged(ExecutionState previous, ExecutionState current, Exception error) {
210
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216 StateChanged.DispatchEvent(
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parents: 208
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217 this,
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218 new StateChangeEventArgs {
205
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219 State = current,
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220 LastError = error
210
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221 }
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222 );
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223 if (current == ExecutionState.Disposed) {
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224 GC.SuppressFinalize(this);
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225 Dispose(true);
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226 }
184
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227 }
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228
203
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229 /// <summary>
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parents: 202
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230 /// Moves the component from running to failed state.
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parents: 202
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231 /// </summary>
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parents: 202
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232 /// <param name="error">The exception which is describing the error.</param>
205
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233 protected bool Fail(Exception error) {
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234 return MoveIfInState(Commands.Fail, null, error, ExecutionState.Running);
203
4d9830a9bbb8 Added 'Fail' method to RunnableComponent which allows component to move from
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parents: 202
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235 }
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parents: 202
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236
205
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237 /// <summary>
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238 /// Tries to reset <see cref="ExecutionState.Failed"/> state to <see cref="ExecutionState.Ready"/>.
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239 /// </summary>
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240 /// <returns>True if component is reset to <see cref="ExecutionState.Ready"/>, false if the componet wasn't
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241 /// in <see cref="ExecutionState.Failed"/> state.</returns>
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parents: 203
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242 /// <remarks>
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cin
parents: 203
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243 /// This method checks the current state of the component and if it's in <see cref="ExecutionState.Failed"/>
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244 /// moves component to <see cref="ExecutionState.Initializing"/>.
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parents: 203
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245 /// The <see cref="OnResetState()"/> is called and if this method completes succesfully the component moved
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246 /// to <see cref="ExecutionState.Ready"/> state, otherwise the component is moved to <see cref="ExecutionState.Failed"/>
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247 /// state. If <see cref="OnResetState()"/> throws an exception it will be propagated by this method to the caller.
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parents: 203
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248 /// </remarks>
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parents: 203
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249 protected bool ResetState() {
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parents: 203
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250 if (!MoveIfInState(Commands.Reset, null, null, ExecutionState.Failed))
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parents: 203
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251 return false;
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parents: 203
diff changeset
252
184
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parents: 180
diff changeset
253 try {
205
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parents: 203
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254 OnResetState();
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parents: 203
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255 Move(Commands.Ok, null, null);
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parents: 203
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256 return true;
184
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parents: 180
diff changeset
257 } catch (Exception err) {
205
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parents: 203
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258 Move(Commands.Fail, null, err);
184
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diff changeset
259 throw;
205
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parents: 203
diff changeset
260 }
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parents: 203
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261 }
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parents: 203
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262
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parents: 203
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263 /// <summary>
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parents: 203
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264 /// This method is called by <see cref="ResetState"/> to reinitialize component in the failed state.
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parents: 203
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265 /// </summary>
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parents: 203
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266 /// <remarks>
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parents: 203
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267 /// Default implementation throws <see cref="NotImplementedException"/> which will cause the component
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268 /// fail to reset it's state and it left in <see cref="ExecutionState.Failed"/> state.
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269 /// If this method doesn't throw exceptions the component is moved to <see cref="ExecutionState.Ready"/> state.
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270 /// </remarks>
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271 protected virtual void OnResetState() {
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parents: 203
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272 throw new NotImplementedException();
184
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diff changeset
273 }
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parents: 180
diff changeset
274
185
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275 IPromise InvokeAsync(Commands cmd, Func<IPromise> action, Action<IPromise, IDeferred> chain) {
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parents: 184
diff changeset
276 IPromise promise = null;
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parents: 184
diff changeset
277 IPromise prev;
184
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diff changeset
278
185
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279 var task = new ActionChainTask(action, null, null, true);
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280
205
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281 Action<Exception> errorOrCancel = e => {
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parents: 203
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282 if (e == null)
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parents: 203
diff changeset
283 e = new OperationCanceledException();
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parents: 203
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284 MoveIfPending(Commands.Fail, null, e, promise);
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parents: 203
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285 throw new PromiseTransientException(e);
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parents: 203
diff changeset
286 };
184
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parents: 180
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287
205
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parents: 203
diff changeset
288 promise = task.Then(
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parents: 203
diff changeset
289 () => MoveIfPending(Commands.Ok, null, null, promise),
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parents: 203
diff changeset
290 errorOrCancel,
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parents: 203
diff changeset
291 errorOrCancel
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parents: 203
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292 );
196
40d7fed4a09e fixed promise chaining behavior, the error handler doesn't handle result or cancellation handlers exceptions these exceptions are propagated to the next handlers.
cin
parents: 187
diff changeset
293
205
8200ab154c8a Added ResetState to RunnableComponent to reset in case of failure
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parents: 203
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294 prev = Move(cmd, promise, null);
157
cin
parents: 156
diff changeset
295
185
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parents: 184
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296 if (prev == null)
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297 task.Resolve();
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parents: 184
diff changeset
298 else
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299 chain(prev, task);
156
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
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300
185
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parents: 184
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301 return promise;
156
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
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302 }
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parents:
diff changeset
303
184
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304
156
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
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parents:
diff changeset
305 #region IInitializable implementation
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306
205
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parents: 203
diff changeset
307 public void Initialize() {
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diff changeset
308 Move(Commands.Init, null, null);
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parents: 203
diff changeset
309
8200ab154c8a Added ResetState to RunnableComponent to reset in case of failure
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parents: 203
diff changeset
310 try {
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parents: 203
diff changeset
311 OnInitialize();
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parents: 203
diff changeset
312 Move(Commands.Ok, null, null);
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cin
parents: 203
diff changeset
313 } catch (Exception err) {
8200ab154c8a Added ResetState to RunnableComponent to reset in case of failure
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parents: 203
diff changeset
314 Move(Commands.Fail, null, err);
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parents: 203
diff changeset
315 throw;
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cin
parents: 203
diff changeset
316 }
184
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parents: 180
diff changeset
317 }
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diff changeset
318
d6a8cba73acc working on runnable component
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diff changeset
319 protected virtual void OnInitialize() {
156
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
320 }
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
321
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
322 #endregion
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
323
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
324 #region IRunnable implementation
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
325
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
326 public IPromise Start() {
185
822aab37b107 runnable component, work in progress
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parents: 184
diff changeset
327 return InvokeAsync(Commands.Start, OnStart, null);
156
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
328 }
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
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parents:
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329
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
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diff changeset
330 protected virtual IPromise OnStart() {
205
8200ab154c8a Added ResetState to RunnableComponent to reset in case of failure
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parents: 203
diff changeset
331 return Promise.Success;
156
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
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332 }
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
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333
185
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parents: 184
diff changeset
334 public IPromise Stop() {
210
5dc21f6a3222 Code review for RunnableComponent
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diff changeset
335 return InvokeAsync(Commands.Stop, OnStop, StopPending);
185
822aab37b107 runnable component, work in progress
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parents: 184
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336 }
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337
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diff changeset
338 protected virtual IPromise OnStop() {
205
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parents: 203
diff changeset
339 return Promise.Success;
156
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
340 }
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
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parents:
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341
185
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342 /// <summary>
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diff changeset
343 /// Stops the current operation if one exists.
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parents: 184
diff changeset
344 /// </summary>
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parents: 184
diff changeset
345 /// <param name="current">Current.</param>
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parents: 184
diff changeset
346 /// <param name="stop">Stop.</param>
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diff changeset
347 protected virtual void StopPending(IPromise current, IDeferred stop) {
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diff changeset
348 if (current == null) {
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diff changeset
349 stop.Resolve();
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parents: 184
diff changeset
350 } else {
187
dd4a3590f9c6 Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler
cin
parents: 186
diff changeset
351 // связваем текущую операцию с операцией остановки
dd4a3590f9c6 Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler
cin
parents: 186
diff changeset
352 current.On(
dd4a3590f9c6 Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler
cin
parents: 186
diff changeset
353 stop.Resolve, // если текущая операция заверщилась, то можно начинать остановку
dd4a3590f9c6 Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler
cin
parents: 186
diff changeset
354 stop.Reject, // если текущая операция дала ошибку - то все плохо, нельзя продолжать
dd4a3590f9c6 Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler
cin
parents: 186
diff changeset
355 e => stop.Resolve() // если текущая отменилась, то можно начинать остановку
dd4a3590f9c6 Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler
cin
parents: 186
diff changeset
356 );
dd4a3590f9c6 Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler
cin
parents: 186
diff changeset
357 // посылаем текущей операции сигнал остановки
185
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diff changeset
358 current.Cancel();
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parents: 184
diff changeset
359 }
156
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
360 }
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
361
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
362 public ExecutionState State {
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
363 get {
203
4d9830a9bbb8 Added 'Fail' method to RunnableComponent which allows component to move from
cin
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diff changeset
364 return m_stateMachine.State;
156
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
365 }
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
366 }
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
367
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
368 public Exception LastError {
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
cin
parents:
diff changeset
369 get {
185
822aab37b107 runnable component, work in progress
cin
parents: 184
diff changeset
370 return m_lastError;
156
97fbbf816844 Promises: SignalXXX methods merged into SignalHandler method.
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371 }
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372 }
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373
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374 #endregion
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375
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376 #region IDisposable implementation
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377
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378 /// <summary>
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379 /// Releases all resource used by the <see cref="Implab.Components.RunnableComponent"/> object.
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380 /// </summary>
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381 /// <remarks>
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382 /// <para>Will not try to stop the component, it will just release all resources.
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383 /// To cleanup the component gracefully use <see cref="Stop()"/> method.</para>
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384 /// <para>
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385 /// In normal cases the <see cref="Dispose()"/> method shouldn't be called, the call to the <see cref="Stop()"/>
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386 /// method is sufficient to cleanup the component. Call <see cref="Dispose()"/> only to cleanup after errors,
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387 /// especially if <see cref="Stop"/> method is failed. Using this method insted of <see cref="Stop()"/> may
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388 /// lead to the data loss by the component.
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389 /// </para></remarks>
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390 [SuppressMessage("Microsoft.Design", "CA1063:ImplementIDisposableCorrectly", Justification = "Dipose(bool) and GC.SuppessFinalize are called")]
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391 public void Dispose() {
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392 Move(Commands.Dispose, null, null);
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393 }
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394
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395 ~RunnableComponent() {
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396 Dispose(false);
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397 }
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398
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399 #endregion
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400
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401 /// <summary>
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402 /// Releases all resources used by the component, called automatically, override this method to implement your cleanup.
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403 /// </summary>
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404 /// <param name="disposing">true if this method is called during normal dispose process.</param>
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405 /// <param name="pending">The operation which is currenty pending</param>
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406 protected virtual void Dispose(bool disposing) {
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407 }
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408
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409 }
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410 }
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411