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1 /* |
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2 * Copyright (c) 2004-2008 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 |
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18 using System; |
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19 using System.Collections.Generic; |
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20 using System.Text; |
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21 using System.Threading; |
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22 using System.ComponentModel; |
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23 |
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24 namespace CrashDebuggerLib.Threading |
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25 { |
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26 // <summary> |
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27 // Serialises asynchronous requests - mainly because the symbol engine doesn't much |
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28 // like having dynamically loaded codesegments unloaded underneath it - i.e. it doesn't |
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29 // work multithreaded! |
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30 // </summary> |
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31 internal class AsyncOperationManager |
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32 { |
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33 #region Constructors |
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34 public AsyncOperationManager() |
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35 { |
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36 } |
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37 #endregion |
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38 |
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39 #region API |
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40 public void Clear() |
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41 { |
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42 lock ( this ) |
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43 { |
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44 iStarted = false; |
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45 iQueue.Clear(); |
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46 } |
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47 } |
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48 |
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49 public void Start() |
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50 { |
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51 lock ( this ) |
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52 { |
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53 iStarted = true; |
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54 StartNextOperation(); |
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55 } |
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56 } |
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57 |
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58 public void Queue( AsyncOperation aOperation ) |
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59 { |
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60 Queue( aOperation, false ); |
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61 } |
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62 |
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63 public void Queue( AsyncOperation aOperation, bool aHighPriority ) |
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64 { |
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65 lock ( this ) |
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66 { |
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67 if ( aHighPriority ) |
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68 { |
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69 iQueue.Insert( 0, aOperation ); |
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70 } |
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71 else |
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72 { |
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73 iQueue.Add( aOperation ); |
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74 } |
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75 } |
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76 |
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77 //System.Diagnostics.Debug.WriteLine( "[AOP] - Add - Queue now contains " + iQueue.Count + " entries..." ); |
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78 StartNextOperation(); |
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79 } |
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80 #endregion |
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81 |
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82 #region Event handlers |
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83 void Operation_RunWorkerCompleted( object aSender, RunWorkerCompletedEventArgs aArgs ) |
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84 { |
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85 lock ( this ) |
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86 { |
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87 AsyncOperation op = (AsyncOperation) aSender; |
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88 op.RunWorkerCompleted -= new RunWorkerCompletedEventHandler( Operation_RunWorkerCompleted ); |
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89 iPendingOperation = false; |
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90 } |
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91 // |
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92 StartNextOperation(); |
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93 //System.Diagnostics.Debug.WriteLine( "[AOP] - Fin -Queue now contains " + iQueue.Count + " entries..." ); |
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94 } |
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95 #endregion |
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96 |
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97 #region Properties |
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98 #endregion |
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99 |
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100 #region Internal methods |
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101 private void StartNextOperation() |
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102 { |
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103 lock ( this ) |
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104 { |
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105 if ( iStarted ) |
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106 { |
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107 if ( iQueue.Count > 0 && !iPendingOperation ) |
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108 { |
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109 AsyncOperation op = iQueue[ 0 ]; |
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110 iQueue.RemoveAt( 0 ); |
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111 // |
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112 op.RunWorkerCompleted += new RunWorkerCompletedEventHandler( Operation_RunWorkerCompleted ); |
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113 iPendingOperation = true; |
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114 op.RunWorkerAsync( op ); |
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115 // |
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116 //System.Diagnostics.Debug.WriteLine( "[AOP] - Start - Starting op with " + iQueue.Count + " remaining..." ); |
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117 } |
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118 else |
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119 { |
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120 System.Diagnostics.Debug.WriteLine( "[AOP] - Start - Is empty!" ); |
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121 } |
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122 } |
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123 else |
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124 { |
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125 System.Diagnostics.Debug.WriteLine( "[AOP] - Start - Queue is disabled!" ); |
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126 } |
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127 } |
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128 } |
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129 #endregion |
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130 |
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131 #region Data members |
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132 private List<AsyncOperation> iQueue = new List<AsyncOperation>(); |
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133 private bool iPendingOperation = false; |
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134 private bool iStarted = false; |
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135 #endregion |
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136 } |
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137 } |