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source: branches/Async/HeuristicLab.Optimization/3.3/Algorithms/BasicAlgorithm.cs @ 15232

Last change on this file since 15232 was 15232, checked in by jkarder, 7 years ago

#2258: worked on exception handling

File size: 4.2 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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.Linq;
24using System.Threading;
25using HeuristicLab.Common;
26using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
27
28namespace HeuristicLab.Optimization {
29  [StorableClass]
30  public abstract class BasicAlgorithm : Algorithm, IStorableContent {
31    public string Filename { get; set; }
32
33    [Storable]
34    private ResultCollection results;
35    public override ResultCollection Results {
36      get { return results; }
37    }
38
39    private CancellationTokenSource cancellationTokenSource;
40    protected CancellationTokenSource CancellationTokenSource {
41      get { return cancellationTokenSource; }
42      private set { cancellationTokenSource = value; }
43    }
44
45    [StorableConstructor]
46    protected BasicAlgorithm(bool deserializing) : base(deserializing) { }
47    protected BasicAlgorithm(BasicAlgorithm original, Cloner cloner)
48      : base(original, cloner) {
49      results = cloner.Clone(original.Results);
50    }
51    protected BasicAlgorithm()
52      : base() {
53      results = new ResultCollection();
54    }
55
56    public override void Prepare() {
57      if (Problem == null) return;
58      base.Prepare();
59      results.Clear();
60      OnPrepared();
61    }
62
63    public override void Start(CancellationToken cancellationToken) {
64      base.Start(cancellationToken);
65      CancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
66
67      OnStarted();
68      try {
69        Run((object)cancellationTokenSource.Token);
70      } catch (OperationCanceledException) {
71      } catch (AggregateException ae) {
72        OnExceptionOccurred(ae.InnerExceptions.SingleOrDefault() ?? ae);
73      } catch (Exception e) {
74        OnExceptionOccurred(e);
75      }
76
77      CancellationTokenSource.Dispose();
78      CancellationTokenSource = null;
79      OnStopped();
80    }
81
82    public override void Pause() {
83      throw new NotSupportedException("Pause is not supported in basic algorithms.");
84    }
85
86    public override void Stop() {
87      // CancellationToken.ThrowIfCancellationRequested() must be called from within the Run method, otherwise stop does nothing
88      // alternatively check the IsCancellationRequested property of the cancellation token
89      base.Stop();
90      CancellationTokenSource.Cancel();
91    }
92
93
94    private DateTime lastUpdateTime;
95    private void Run(object state) {
96      CancellationToken cancellationToken = (CancellationToken)state;
97      lastUpdateTime = DateTime.UtcNow;
98      System.Timers.Timer timer = new System.Timers.Timer(250);
99      timer.AutoReset = true;
100      timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
101      timer.Start();
102      try {
103        Run(cancellationToken);
104      } finally {
105        timer.Elapsed -= new System.Timers.ElapsedEventHandler(timer_Elapsed);
106        timer.Stop();
107        ExecutionTime += DateTime.UtcNow - lastUpdateTime;
108      }
109    }
110
111    protected abstract void Run(CancellationToken cancellationToken);
112
113    #region Events
114    private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e) {
115      System.Timers.Timer timer = (System.Timers.Timer)sender;
116      timer.Enabled = false;
117      DateTime now = DateTime.UtcNow;
118      ExecutionTime += now - lastUpdateTime;
119      lastUpdateTime = now;
120      timer.Enabled = true;
121    }
122    #endregion
123
124  }
125}
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