1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Linq;
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4 | using System.Text;
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5 | using System.ComponentModel;
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6 | using System.Threading;
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7 | using System.Collections.ObjectModel;
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8 | using System.Collections.Specialized;
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9 | using System.Collections;
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10 |
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11 | namespace HeuristicLab.BackgroundProcessing {
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12 |
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13 |
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14 | /// <summary>
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15 | /// Provides a list of all currently running or pending ObservableBackgroundWorkers.
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16 | /// </summary>
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17 | public class WorkerMonitor : ObservableEnumerable<ObservableBackgroundWorker> {
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18 |
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19 | public static WorkerMonitor Default = new WorkerMonitor();
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20 |
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21 | public event ThreadExceptionEventHandler ThreadException;
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22 | public event NotifyCollectionChangedEventHandler CollectionChanged;
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23 |
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24 | private List<ObservableBackgroundWorker> BackgroundWorkers;
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25 | private ReaderWriterLockSlim workerLock;
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26 |
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27 | public WorkerMonitor() {
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28 | BackgroundWorkers = new List<ObservableBackgroundWorker>();
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29 | workerLock = new ReaderWriterLockSlim(LockRecursionPolicy.NoRecursion);
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30 | }
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31 |
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32 | internal void RegisterWorker(ObservableBackgroundWorker worker) {
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33 | worker.RunWorkerCompleted += worker_RunWorkerCompleted;
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34 | worker.WorkerStopped += worker_WorkerStopped;
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35 | try {
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36 | workerLock.EnterUpgradeableReadLock();
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37 | try {
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38 | workerLock.EnterWriteLock();
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39 | BackgroundWorkers.Add(worker);
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40 | } finally {
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41 | workerLock.ExitWriteLock();
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42 | }
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43 | int index = BackgroundWorkers.Count - 1;
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44 | OnCollectionChanged(new NotifyCollectionChangedEventArgs(
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45 | NotifyCollectionChangedAction.Add, worker, index));
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46 | } finally {
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47 | workerLock.ExitUpgradeableReadLock();
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48 | }
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49 | }
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50 |
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51 | void worker_WorkerStopped(object sender, EventArgs e) {
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52 | ObservableBackgroundWorker worker = sender as ObservableBackgroundWorker;
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53 | try {
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54 | workerLock.EnterUpgradeableReadLock();
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55 | int index = BackgroundWorkers.IndexOf(worker);
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56 | try {
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57 | workerLock.EnterWriteLock();
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58 | BackgroundWorkers.RemoveAt(index);
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59 | } finally {
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60 | workerLock.ExitWriteLock();
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61 | }
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62 | OnCollectionChanged(new NotifyCollectionChangedEventArgs(
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63 | NotifyCollectionChangedAction.Remove, worker, index));
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64 | } finally {
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65 | workerLock.ExitUpgradeableReadLock();
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66 | }
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67 | }
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68 |
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69 | private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) {
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70 | ObservableBackgroundWorker worker = sender as ObservableBackgroundWorker;
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71 | if (e.Error != null) {
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72 | OnThreadException(new Exception(worker.Name, e.Error));
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73 | }
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74 | }
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75 |
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76 | protected void OnThreadException(Exception x) {
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77 | if (ThreadException != null)
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78 | ThreadException(this, new ThreadExceptionEventArgs(x));
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79 | }
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80 |
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81 | public IEnumerator<ObservableBackgroundWorker> GetEnumerator() {
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82 | try {
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83 | workerLock.EnterReadLock();
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84 | IList<ObservableBackgroundWorker> copy = BackgroundWorkers.ToList();
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85 | return copy.GetEnumerator();
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86 | } finally {
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87 | workerLock.ExitReadLock();
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88 | }
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89 | }
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90 |
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91 | IEnumerator IEnumerable.GetEnumerator() {
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92 | return GetEnumerator();
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93 | }
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94 |
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95 | protected void OnCollectionChanged(NotifyCollectionChangedEventArgs args) {
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96 | if (CollectionChanged != null)
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97 | CollectionChanged(this, args);
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98 | }
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99 |
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100 | public void CancelAll() {
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101 | List<ObservableBackgroundWorker> cancelableWorkers = GetCancelableWorkers();
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102 | lock (cancelableWorkers) {
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103 | foreach (var worker in cancelableWorkers.ToList()) {
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104 | worker.WorkerStopped += (sender, args) => {
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105 | lock (cancelableWorkers) {
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106 | cancelableWorkers.Remove((ObservableBackgroundWorker)sender);
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107 | Monitor.Pulse(cancelableWorkers);
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108 | }
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109 | };
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110 | worker.CancelAsync();
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111 | if (!worker.IsRunning)
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112 | cancelableWorkers.Remove(worker);
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113 | }
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114 | while (cancelableWorkers.Count > 0)
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115 | Monitor.Wait(cancelableWorkers);
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116 | }
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117 | }
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118 |
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119 | private List<ObservableBackgroundWorker> GetCancelableWorkers() {
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120 | try {
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121 | workerLock.EnterReadLock();
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122 | return BackgroundWorkers.Where(w => w.WorkerSupportsCancellation).ToList();
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123 | } finally {
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124 | workerLock.ExitReadLock();
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125 | }
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126 | }
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127 | }
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128 | }
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