1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2010 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 HeuristicLab.Core;
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24 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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25 |
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26 | namespace HeuristicLab.SequentialEngine {
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27 | /// <summary>
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28 | /// Represents an engine that executes its steps sequentially, also if they could be executed
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29 | /// in parallel.
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30 | /// </summary>
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31 | [StorableClass]
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32 | [Item("Sequential Engine", "Engine for sequential execution of algorithms.")]
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33 | public class SequentialEngine : Engine {
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34 | private IOperator currentOperator;
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35 |
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36 | /// <summary>
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37 | /// Deals with the next operation, if it is an <see cref="AtomicOperation"/> it is executed,
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38 | /// if it is a <see cref="CompositeOperation"/> its single operations are pushed on the execution stack.
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39 | /// </summary>
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40 | /// <remarks>If an error occurs during the execution the operation is aborted and the operation
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41 | /// is pushed on the stack again.<br/>
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42 | /// If the execution was successful <see cref="EngineBase.OnOperationExecuted"/> is called.</remarks>
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43 | protected override void ProcessNextOperator() {
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44 | currentOperator = null;
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45 | IOperation next = ExecutionStack.Pop();
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46 | OperationCollection coll = next as OperationCollection;
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47 | while (coll != null) {
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48 | for (int i = coll.Count - 1; i >= 0; i--)
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49 | ExecutionStack.Push(coll[i]);
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50 | next = ExecutionStack.Count > 0 ? ExecutionStack.Pop() : null;
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51 | coll = next as OperationCollection;
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52 | }
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53 | IAtomicOperation operation = next as IAtomicOperation;
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54 | if (operation != null) {
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55 | try {
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56 | currentOperator = operation.Operator;
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57 | ExecutionStack.Push(operation.Operator.Execute((IExecutionContext)operation));
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58 | }
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59 | catch (Exception ex) {
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60 | ExecutionStack.Push(operation);
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61 | OnExceptionOccurred(ex);
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62 | Pause();
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63 | }
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64 | if (operation.Operator.Breakpoint)
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65 | Pause();
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66 | }
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67 | }
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68 |
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69 | public override void Pause() {
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70 | base.Pause();
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71 | if (currentOperator != null) currentOperator.Abort();
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72 | }
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73 | public override void Stop() {
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74 | base.Stop();
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75 | if (currentOperator != null) currentOperator.Abort();
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76 | }
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77 | }
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78 | }
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