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source: trunk/sources/HeuristicLab.Core/3.3/Engine.cs @ 12438

Last change on this file since 12438 was 12012, checked in by ascheibe, 10 years ago

#2212 merged r12008, r12009, r12010 back into trunk

File size: 5.5 KB
RevLine 
[2]1#region License Information
2/* HeuristicLab
[12012]3 * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
[2]4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using System.Threading;
[5193]25using System.Threading.Tasks;
[3376]26using HeuristicLab.Common;
[1823]27using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
[2]28
29namespace HeuristicLab.Core {
[2664]30  [Item("Engine", "A base class for engines.")]
[3017]31  [StorableClass]
[3262]32  public abstract class Engine : Executable, IEngine {
[2653]33    [Storable]
[3289]34    protected ILog log;
35    public ILog Log {
36      get { return log; }
37    }
38
39    [Storable]
[2834]40    private Stack<IOperation> executionStack;
41    protected Stack<IOperation> ExecutionStack {
[2653]42      get { return executionStack; }
[2]43    }
[1667]44
[5193]45    #region Variables for communication between threads
46    private CancellationTokenSource cancellationTokenSource;
47    private bool stopPending;
[3262]48    private DateTime lastUpdateTime;
[5193]49    #endregion
[776]50
[4722]51    [StorableConstructor]
[5193]52    protected Engine(bool deserializing) : base(deserializing) { }
[4722]53    protected Engine(Engine original, Cloner cloner)
54      : base(original, cloner) {
55      log = cloner.Clone(original.log);
56      executionStack = new Stack<IOperation>();
57      IOperation[] contexts = original.executionStack.ToArray();
58      for (int i = contexts.Length - 1; i >= 0; i--)
59        executionStack.Push(cloner.Clone(contexts[i]));
60    }
61    protected Engine()
62      : base() {
63      log = new Log();
64      executionStack = new Stack<IOperation>();
[3289]65    }
[2]66
[3262]67    public sealed override void Prepare() {
68      base.Prepare();
69      executionStack.Clear();
70      OnPrepared();
71    }
[2834]72    public void Prepare(IOperation initialOperation) {
[3262]73      base.Prepare();
[2653]74      executionStack.Clear();
[2834]75      if (initialOperation != null)
76        executionStack.Push(initialOperation);
[2790]77      OnPrepared();
[2]78    }
[3289]79    protected override void OnPrepared() {
80      Log.LogMessage("Engine prepared");
81      base.OnPrepared();
82    }
83
[3262]84    public override void Start() {
85      base.Start();
[5193]86      cancellationTokenSource = new CancellationTokenSource();
87      stopPending = false;
88      Task task = Task.Factory.StartNew(Run, cancellationTokenSource.Token, cancellationTokenSource.Token);
89      task.ContinueWith(t => {
90        try {
91          t.Wait();
92        }
93        catch (AggregateException ex) {
94          try {
95            ex.Flatten().Handle(x => x is OperationCanceledException);
96          }
97          catch (AggregateException remaining) {
98            if (remaining.InnerExceptions.Count == 1) OnExceptionOccurred(remaining.InnerExceptions[0]);
99            else OnExceptionOccurred(remaining);
100          }
101        }
102        cancellationTokenSource.Dispose();
103        cancellationTokenSource = null;
104        if (stopPending) executionStack.Clear();
105        if (executionStack.Count == 0) OnStopped();
106        else OnPaused();
107      });
[2]108    }
[3289]109    protected override void OnStarted() {
110      Log.LogMessage("Engine started");
111      base.OnStarted();
112    }
113
[3262]114    public override void Pause() {
115      base.Pause();
[5193]116      cancellationTokenSource.Cancel();
[2]117    }
[3289]118    protected override void OnPaused() {
119      Log.LogMessage("Engine paused");
120      base.OnPaused();
121    }
122
[3262]123    public override void Stop() {
124      base.Stop();
[5193]125      if (ExecutionState == ExecutionState.Paused) {
126        executionStack.Clear();
127        OnStopped();
128      } else {
129        stopPending = true;
130        cancellationTokenSource.Cancel();
131      }
[2]132    }
[3289]133    protected override void OnStopped() {
134      Log.LogMessage("Engine stopped");
135      base.OnStopped();
136    }
[2]137
[3289]138    protected override void OnExceptionOccurred(Exception exception) {
139      Log.LogException(exception);
140      base.OnExceptionOccurred(exception);
141    }
142
[2]143    private void Run(object state) {
[5193]144      CancellationToken cancellationToken = (CancellationToken)state;
145
[2653]146      OnStarted();
[9343]147      lastUpdateTime = DateTime.UtcNow;
[5240]148      System.Timers.Timer timer = new System.Timers.Timer(250);
[5193]149      timer.AutoReset = true;
150      timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
[3262]151      timer.Start();
[5193]152      try {
153        Run(cancellationToken);
[2]154      }
[5193]155      finally {
[5444]156        timer.Elapsed -= new System.Timers.ElapsedEventHandler(timer_Elapsed);
[5193]157        timer.Stop();
[9343]158        ExecutionTime += DateTime.UtcNow - lastUpdateTime;
[5193]159      }
[3262]160
[5193]161      cancellationToken.ThrowIfCancellationRequested();
[2]162    }
[5193]163    protected abstract void Run(CancellationToken cancellationToken);
[2]164
[3262]165    private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e) {
[5240]166      System.Timers.Timer timer = (System.Timers.Timer)sender;
167      timer.Enabled = false;
[9343]168      DateTime now = DateTime.UtcNow;
[3262]169      ExecutionTime += now - lastUpdateTime;
170      lastUpdateTime = now;
[5240]171      timer.Enabled = true;
[3226]172    }
[2]173  }
174}
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