author | Jussi Ryoma <ext-jussi.s.ryoma@nokia.com> |
Fri, 27 Aug 2010 12:21:46 +0300 | |
changeset 3 | 045ade241ef5 |
parent 0 | 818e61de6cd1 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2004-2008 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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|
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using System; |
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using System.Text; |
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using System.Threading; |
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using System.Collections; |
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using SymBuildParsingLib.Utils; |
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using SymBuildParsingLib.Lexer; |
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using SymBuildParsingLib.Token; |
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|
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namespace SymBuildParsingLib.Grouper |
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{ |
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public class SymGrouper |
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{ |
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#region Enumerations |
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public enum TEvent |
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{ |
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EEventGroupingStarted = 0, |
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EEventGroupingPaused, |
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EEventGroupingTokenReady, |
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EEventGroupingComplete |
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}; |
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#endregion |
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|
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#region Observer interface |
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public delegate void GrouperObserver( SymGrouper aGrouper, TEvent aEvent, SymToken aToken ); |
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#endregion |
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|
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#region Events |
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public event GrouperObserver GrouperObservers; |
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#endregion |
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|
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#region Constructors & destructor |
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public SymGrouper( SymLexer aLexer ) |
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{ |
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// The mastermind implements all the logic for grouping token runs into |
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// more sophisticated/logical token groupings. |
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iMastermind.MastermindObservers += new SymGrouperMastermind.MastermindObserver( MastermindObserver ); |
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|
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// Observe the lexer for tokens |
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aLexer.LexerObservers += new SymLexer.LexerObserver( LexerTokenHandler ); |
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|
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// Prepare worker thread |
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ThreadStart threadStart = new ThreadStart( DoGrouping ); |
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iWorkerThread = new Thread( threadStart ); |
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iWorkerThread.Name = "SymGrouperWorkerThread"; |
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iWorkerThread.IsBackground = true; |
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iWorkerThread.Start(); |
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} |
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#endregion |
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#region Internal methods |
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private void ReportEvent( TEvent aEvent, SymToken aToken ) |
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{ |
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if ( GrouperObservers != null ) |
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{ |
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GrouperObservers( this, aEvent, aToken ); |
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} |
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} |
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#endregion |
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#region Internal threading related |
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private void DoGrouping() |
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{ |
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ReportEvent( TEvent.EEventGroupingStarted, SymToken.NullToken() ); |
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bool lexerFinished = false; |
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do |
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{ |
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// Count how many tokens we have... |
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lock( this ) |
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{ |
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iMastermind.PerformGrouping(); |
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lexerFinished = iLexerFinished; |
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} |
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// Wait until there are more items to process |
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if ( lexerFinished == false ) |
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{ |
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ReportEvent( TEvent.EEventGroupingPaused, SymToken.NullToken() ); |
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iSemaphore.Wait(); |
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ReportEvent( TEvent.EEventGroupingStarted, SymToken.NullToken() ); |
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} |
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} |
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while ( lexerFinished == false ); |
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|
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ReportEvent( TEvent.EEventGroupingComplete, SymToken.NullToken() ); |
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} |
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#endregion |
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#region Event handlers |
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private void LexerTokenHandler( SymLexer aLexer, SymLexer.TEvent aEvent, SymToken aToken ) |
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{ |
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if ( aEvent == SymLexer.TEvent.EEventLexingToken ) |
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110 |
{ |
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111 |
// Store the token |
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112 |
lock( this ) |
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113 |
{ |
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114 |
iMastermind.EnqueueLexedToken( aToken ); |
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115 |
} |
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116 |
|
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117 |
// and signal the worker thread if it is waiting... |
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118 |
if ( iSemaphore.Count == 0 ) |
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119 |
{ |
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120 |
iSemaphore.Signal(); |
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121 |
} |
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122 |
} |
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else if ( aEvent == SymLexer.TEvent.EEventLexingComplete ) |
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124 |
{ |
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125 |
lock( this ) |
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126 |
{ |
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127 |
iLexerFinished = true; |
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128 |
} |
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129 |
|
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130 |
// and signal the worker thread if it is waiting... |
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131 |
if ( iSemaphore.Count == 0 ) |
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132 |
{ |
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133 |
iSemaphore.Signal(); |
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134 |
} |
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135 |
} |
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136 |
} |
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137 |
|
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138 |
private void MastermindObserver( SymGrouperMastermind.TEvent aEvent, SymToken aGroupedToken ) |
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139 |
{ |
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140 |
// We've received a token from the grouper. Pass it on to our observer to handle. |
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141 |
if ( aEvent == SymGrouperMastermind.TEvent.EEventGroupTokenReady ) |
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142 |
{ |
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ReportEvent( TEvent.EEventGroupingTokenReady, aGroupedToken ); |
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144 |
} |
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145 |
} |
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146 |
#endregion |
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147 |
|
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148 |
#region Data members |
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149 |
private Thread iWorkerThread; |
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150 |
private SymGrouperMastermind iMastermind = new SymGrouperMastermind(); |
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151 |
private SymSemaphore iSemaphore = new SymSemaphore( 0, 1 ); |
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152 |
private bool iLexerFinished = false; |
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153 |
#endregion |
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154 |
} |
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155 |
} |