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source: trunk/sources/HeuristicLab.SequentialEngine/3.3/SequentialEngine.cs @ 2879

Last change on this file since 2879 was 2851, checked in by swagner, 15 years ago

Operator architecture refactoring (#95)

  • worked on algorithms
File size: 2.9 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 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 HeuristicLab.Core;
24using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
25
26namespace HeuristicLab.SequentialEngine {
27  /// <summary>
28  /// Represents an engine that executes its steps sequentially, also if they could be executed
29  /// in parallel.
30  /// </summary>
31  [EmptyStorableClass]
32  [Creatable("Engines")]
33  [Item("Sequential Engine", "Engine for sequential execution of algorithms.")]
34  public class SequentialEngine : Engine {
35    private IOperator currentOperator;
36
37    /// <summary>
38    /// Deals with the next operation, if it is an <see cref="AtomicOperation"/> it is executed,
39    /// if it is a <see cref="CompositeOperation"/> its single operations are pushed on the execution stack.
40    /// </summary>
41    /// <remarks>If an error occurs during the execution the operation is aborted and the operation
42    /// is pushed on the stack again.<br/>
43    /// If the execution was successful <see cref="EngineBase.OnOperationExecuted"/> is called.</remarks>
44    protected override void ProcessNextOperator() {
45      currentOperator = null;
46      IOperation next = ExecutionStack.Pop();
47      OperationCollection coll = next as OperationCollection;
48      while (coll != null) {
49        for (int i = coll.Count - 1; i >= 0; i--)
50          ExecutionStack.Push(coll[i]);
51        next = ExecutionStack.Count > 0 ? ExecutionStack.Pop() : null;
52        coll = next as OperationCollection;
53      }
54      IAtomicOperation operation = next as IAtomicOperation;
55      if (operation != null) {
56        try {
57          currentOperator = operation.Operator;
58          ExecutionStack.Push(operation.Operator.Execute((IExecutionContext)operation));
59          currentOperator = null;
60        }
61        catch (Exception ex) {
62          ExecutionStack.Push(operation);
63          Stop();
64          OnExceptionOccurred(ex);
65        }
66        if (operation.Operator.Breakpoint)
67          Stop();
68      }
69    }
70
71    protected override void OnCanceledChanged() {
72      if (Canceled && (currentOperator != null))
73        currentOperator.Abort();
74    }
75  }
76}
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