1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using System;
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23 | using System.Collections.Generic;
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24 | using System.Linq;
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25 | using System.Threading;
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26 | using HeuristicLab.Common;
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27 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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28 |
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29 | namespace HeuristicLab.Core {
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30 | [Item("Engine", "A base class for engines.")]
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31 | [StorableClass]
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32 | public abstract class Engine : Executable, IEngine {
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33 | [Storable]
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34 | protected ILog log;
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35 | public ILog Log {
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36 | get { return log; }
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37 | }
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38 |
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39 | [Storable]
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40 | private Stack<IOperation> executionStack;
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41 | protected Stack<IOperation> ExecutionStack {
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42 | get { return executionStack; }
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43 | }
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44 |
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45 | #region Variables for communication between threads
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46 | private CancellationTokenSource cancellationTokenSource;
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47 | private bool stopPending;
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48 | private DateTime lastUpdateTime;
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49 | #endregion
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50 |
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51 | [StorableConstructor]
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52 | protected Engine(bool deserializing) : base(deserializing) { }
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53 | protected Engine(Engine original, Cloner cloner)
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54 | : base(original, cloner) {
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55 | log = cloner.Clone(original.log);
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56 | executionStack = new Stack<IOperation>();
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57 | IOperation[] contexts = original.executionStack.ToArray();
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58 | for (int i = contexts.Length - 1; i >= 0; i--)
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59 | executionStack.Push(cloner.Clone(contexts[i]));
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60 | }
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61 | protected Engine()
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62 | : base() {
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63 | log = new Log();
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64 | executionStack = new Stack<IOperation>();
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65 | }
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66 |
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67 | public sealed override void Prepare() {
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68 | base.Prepare();
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69 | executionStack.Clear();
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70 | OnPrepared();
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71 | }
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72 | public void Prepare(IOperation initialOperation) {
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73 | base.Prepare();
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74 | executionStack.Clear();
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75 | if (initialOperation != null)
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76 | executionStack.Push(initialOperation);
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77 | OnPrepared();
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78 | }
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79 | protected override void OnPrepared() {
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80 | Log.LogMessage("Engine prepared");
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81 | base.OnPrepared();
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82 | }
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83 |
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84 | public override void Start(CancellationToken cancellationToken) {
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85 | base.Start(cancellationToken);
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86 | cancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
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87 | stopPending = false;
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88 |
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89 | try {
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90 | Run((object)cancellationTokenSource.Token);
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91 | } catch (OperationCanceledException) {
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92 | } catch (AggregateException ae) {
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93 | OnExceptionOccurred(ae.InnerExceptions.SingleOrDefault() ?? ae);
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94 | } catch (Exception e) {
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95 | OnExceptionOccurred(e);
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96 | }
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97 |
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98 | cancellationTokenSource.Dispose();
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99 | cancellationTokenSource = null;
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100 | if (stopPending) executionStack.Clear();
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101 | if (executionStack.Count == 0) OnStopped();
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102 | else OnPaused();
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103 | }
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104 | protected override void OnStarted() {
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105 | Log.LogMessage("Engine started");
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106 | base.OnStarted();
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107 | }
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108 |
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109 | public override void Pause() {
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110 | base.Pause();
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111 | cancellationTokenSource.Cancel();
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112 | }
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113 | protected override void OnPaused() {
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114 | Log.LogMessage("Engine paused");
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115 | base.OnPaused();
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116 | }
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117 |
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118 | public override void Stop() {
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119 | base.Stop();
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120 | if (ExecutionState == ExecutionState.Paused) {
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121 | executionStack.Clear();
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122 | OnStopped();
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123 | } else {
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124 | stopPending = true;
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125 | cancellationTokenSource.Cancel();
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126 | }
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127 | }
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128 | protected override void OnStopped() {
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129 | Log.LogMessage("Engine stopped");
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130 | base.OnStopped();
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131 | }
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132 |
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133 | protected override void OnExceptionOccurred(Exception exception) {
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134 | Log.LogException(exception);
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135 | base.OnExceptionOccurred(exception);
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136 | }
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137 |
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138 | private void Run(object state) {
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139 | CancellationToken cancellationToken = (CancellationToken)state;
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140 |
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141 | OnStarted();
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142 | lastUpdateTime = DateTime.UtcNow;
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143 | System.Timers.Timer timer = new System.Timers.Timer(250);
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144 | timer.AutoReset = true;
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145 | timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
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146 | timer.Start();
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147 | try {
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148 | Run(cancellationToken);
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149 | } finally {
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150 | timer.Elapsed -= new System.Timers.ElapsedEventHandler(timer_Elapsed);
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151 | timer.Stop();
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152 | ExecutionTime += DateTime.UtcNow - lastUpdateTime;
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153 | }
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154 |
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155 | cancellationToken.ThrowIfCancellationRequested();
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156 | }
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157 | protected abstract void Run(CancellationToken cancellationToken);
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158 |
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159 | private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e) {
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160 | System.Timers.Timer timer = (System.Timers.Timer)sender;
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161 | timer.Enabled = false;
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162 | DateTime now = DateTime.UtcNow;
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163 | ExecutionTime += now - lastUpdateTime;
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164 | lastUpdateTime = now;
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165 | timer.Enabled = true;
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166 | }
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167 | }
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168 | }
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