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annotate dwt/widgets/Synchronizer.d @ 5:1a8b3cb347e0

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Fix Ctors to 'this'
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 14:02:31 +0200
parents 380af2bdd8e5
children 5b53d338c709
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2007 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11 module dwt.widgets.Synchronizer;
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12
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13 import dwt.dwthelper.utils;
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14
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15
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16 import dwt.DWT;
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17 import dwt.DWTException;
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18 import dwt.graphics.Device;
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19 import dwt.internal.Compatibility;
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20
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21 /**
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22 * Instances of this class provide synchronization support
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23 * for displays. A default instance is created automatically
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24 * for each display, and this instance is sufficient for almost
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25 * all applications.
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26 * <p>
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27 * <b>IMPORTANT:</b> Typical application code <em>never</em>
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28 * needs to deal with this class. It is provided only to
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29 * allow applications which require non-standard
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30 * synchronization behavior to plug in the support they
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31 * require. <em>Subclasses which override the methods in
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32 * this class must ensure that the superclass methods are
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33 * invoked in their implementations</em>
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34 * </p>
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35 *
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36 * @see Display#setSynchronizer
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37 */
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38 public class Synchronizer {
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39 Display display;
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40 int messageCount;
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41 RunnableLock [] messages;
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42 Object messageLock = new Object ();
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43 Thread syncThread;
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44 static final int GROW_SIZE = 4;
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45 static final int MESSAGE_LIMIT = 64;
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46
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47 //TEMPORARY CODE
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48 static final bool IS_CARBON = "carbon".equals (DWT.getPlatform ());
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49
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50 /**
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51 * Constructs a new instance of this class.
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52 *
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53 * @param display the display to create the synchronizer on
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54 */
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55 public this (Display display) {
0
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56 this.display = display;
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57 }
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58
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59 void addLast (RunnableLock lock) {
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60 bool wake = false;
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61 synchronized (messageLock) {
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62 if (messages is null) messages = new RunnableLock [GROW_SIZE];
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63 if (messageCount is messages.length) {
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64 RunnableLock[] newMessages = new RunnableLock [messageCount + GROW_SIZE];
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65 System.arraycopy (messages, 0, newMessages, 0, messageCount);
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66 messages = newMessages;
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67 }
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68 messages [messageCount++] = lock;
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69 wake = messageCount is 1;
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70 }
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71 if (wake) display.wakeThread ();
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72 }
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73
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74 /**
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75 * Causes the <code>run()</code> method of the runnable to
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76 * be invoked by the user-interface thread at the next
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77 * reasonable opportunity. The caller of this method continues
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78 * to run in parallel, and is not notified when the
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79 * runnable has completed.
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80 *
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81 * @param runnable code to run on the user-interface thread.
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82 *
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83 * @see #syncExec
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84 */
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85 protected void asyncExec (Runnable runnable) {
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86 if (runnable is null) {
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87 //TEMPORARY CODE
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88 if (!IS_CARBON) {
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89 display.wake ();
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90 return;
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91 }
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92 }
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93 addLast (new RunnableLock (runnable));
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94 }
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95
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96 int getMessageCount () {
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97 synchronized (messageLock) {
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98 return messageCount;
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99 }
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100 }
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101
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102 void releaseSynchronizer () {
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103 display = null;
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104 messages = null;
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105 messageLock = null;
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106 syncThread = null;
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107 }
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108
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109 RunnableLock removeFirst () {
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110 synchronized (messageLock) {
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111 if (messageCount is 0) return null;
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112 RunnableLock lock = messages [0];
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113 System.arraycopy (messages, 1, messages, 0, --messageCount);
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114 messages [messageCount] = null;
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115 if (messageCount is 0) {
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116 if (messages.length > MESSAGE_LIMIT) messages = null;
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117 }
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118 return lock;
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119 }
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120 }
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121
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122 bool runAsyncMessages () {
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123 return runAsyncMessages (false);
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124 }
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125
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126 bool runAsyncMessages (bool all) {
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127 bool run = false;
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128 do {
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129 RunnableLock lock = removeFirst ();
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130 if (lock is null) return run;
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131 run = true;
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132 synchronized (lock) {
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133 syncThread = lock.thread;
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134 try {
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135 lock.run ();
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136 } catch (Throwable t) {
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137 lock.throwable = t;
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138 DWT.error (DWT.ERROR_FAILED_EXEC, t);
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139 } finally {
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140 syncThread = null;
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141 lock.notifyAll ();
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142 }
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143 }
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144 } while (all);
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145 return run;
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146 }
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147
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148 /**
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149 * Causes the <code>run()</code> method of the runnable to
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150 * be invoked by the user-interface thread at the next
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151 * reasonable opportunity. The thread which calls this method
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152 * is suspended until the runnable completes.
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153 *
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154 * @param runnable code to run on the user-interface thread.
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155 *
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156 * @exception DWTException <ul>
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157 * <li>ERROR_FAILED_EXEC - if an exception occurred when executing the runnable</li>
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158 * </ul>
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159 *
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160 * @see #asyncExec
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161 */
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162 protected void syncExec (Runnable runnable) {
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163 RunnableLock lock = null;
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164 synchronized (Device.class) {
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165 if (display is null || display.isDisposed ()) DWT.error (DWT.ERROR_DEVICE_DISPOSED);
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166 if (!display.isValidThread ()) {
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167 if (runnable is null) {
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168 display.wake ();
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169 return;
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170 }
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171 lock = new RunnableLock (runnable);
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172 /*
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173 * Only remember the syncThread for syncExec.
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174 */
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175 lock.thread = Thread.currentThread();
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176 addLast (lock);
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177 }
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178 }
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179 if (lock is null) {
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180 if (runnable !is null) runnable.run ();
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181 return;
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182 }
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183 synchronized (lock) {
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184 bool interrupted = false;
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185 while (!lock.done ()) {
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186 try {
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187 lock.wait ();
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188 } catch (InterruptedException e) {
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189 interrupted = true;
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190 }
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191 }
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192 if (interrupted) {
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193 Compatibility.interrupt();
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194 }
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195 if (lock.throwable !is null) {
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196 DWT.error (DWT.ERROR_FAILED_EXEC, lock.throwable);
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197 }
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198 }
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199 }
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parents:
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200
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201 }