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annotate dwt/widgets/Synchronizer.d @ 31:92c102dd64a3

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Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
author Frank Benoit <benoit@tionex.de>
date Mon, 28 Jan 2008 04:47:28 +0100
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children 41dbc4d9faab
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31
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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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 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwt.widgets.Synchronizer;
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14
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15 import dwt.widgets.Display;
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16 import dwt.widgets.RunnableLock;
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17 import dwt.dwthelper.Runnable;
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18 import dwt.dwthelper.System;
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19 import dwt.internal.Compatibility;
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20
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21 import dwt.DWT;
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22 import tango.core.Thread;
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23 import tango.core.Exception;
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24
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25 /**
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26 * Instances of this class provide synchronization support
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27 * for displays. A default instance is created automatically
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28 * for each display, and this instance is sufficient for almost
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29 * all applications.
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30 * <p>
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31 * <b>IMPORTANT:</b> Typical application code <em>never</em>
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32 * needs to deal with this class. It is provided only to
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33 * allow applications which require non-standard
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34 * synchronization behavior to plug in the support they
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35 * require. <em>Subclasses which override the methods in
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36 * this class must ensure that the superclass methods are
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37 * invoked in their implementations</em>
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38 * </p>
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39 *
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40 * @see Display#setSynchronizer
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41 */
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42 public class Synchronizer {
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43 Display display;
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44 int messageCount;
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45 RunnableLock [] messages;
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46 Object messageLock;
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47 Thread syncThread;
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48
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49 /**
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50 * Constructs a new instance of this class.
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51 *
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52 * @param display the display to create the synchronizer on
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53 */
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54 public this (Display display) {
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55 this.display = display;
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56 messageLock = new Object ();
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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 [4];
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63 if (messageCount is messages.length) {
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64 RunnableLock[] newMessages = new RunnableLock [messageCount + 4];
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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 public void asyncExec (Runnable runnable) {
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86 if (runnable is null) {
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87 display.wake ();
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88 return;
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89 }
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90 addLast (new RunnableLock (runnable));
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91 }
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92
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93 int getMessageCount () {
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94 synchronized (messageLock) {
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95 return messageCount;
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96 }
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97 }
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98
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99 void releaseSynchronizer () {
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100 display = null;
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101 messages = null;
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102 messageLock = null;
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103 syncThread = null;
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104 }
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105
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106 RunnableLock removeFirst () {
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107 synchronized (messageLock) {
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108 if (messageCount is 0) return null;
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109 RunnableLock lock = messages [0];
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110 System.arraycopy (messages, 1, messages, 0, --messageCount);
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111 messages [messageCount] = null;
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112 if (messageCount is 0) {
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113 if (messages.length > 64) messages = null;
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114 }
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115 return lock;
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116 }
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117 }
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118
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119 bool runAsyncMessages () {
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120 return runAsyncMessages (false);
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121 }
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122
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123 bool runAsyncMessages (bool all) {
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124 bool run = false;
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125 do {
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126 RunnableLock lock = removeFirst ();
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127 if (lock is null) return run;
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128 run = true;
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129 synchronized (lock) {
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130 syncThread = lock.thread;
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131 try {
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132 lock.run ();
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133 } catch (TracedException t) {
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134 lock.throwable = t;
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135 DWT.error (DWT.ERROR_FAILED_EXEC, t);
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136 } finally {
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137 syncThread = null;
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138 lock.notifyAll ();
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139 }
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140 }
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141 } while (all);
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142 return run;
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143 }
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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144
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Frank Benoit <benoit@tionex.de>
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145 /**
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146 * Causes the <code>run()</code> method of the runnable to
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147 * be invoked by the user-interface thread at the next
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148 * reasonable opportunity. The thread which calls this method
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149 * is suspended until the runnable completes.
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150 *
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151 * @param runnable code to run on the user-interface thread.
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152 *
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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153 * @exception DWTException <ul>
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154 * <li>ERROR_FAILED_EXEC - if an exception occurred when executing the runnable</li>
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155 * </ul>
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156 *
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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157 * @see #asyncExec
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158 */
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159 public void syncExec (Runnable runnable) {
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160 if (display.isValidThread ()) {
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161 if (runnable !is null) runnable.run ();
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162 return;
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163 }
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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164 if (runnable is null) {
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165 display.wake ();
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166 return;
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167 }
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168 RunnableLock lock = new RunnableLock (runnable);
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169 /*
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170 * Only remember the syncThread for syncExec.
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171 */
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172 lock.thread = Thread.getThis();
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173 synchronized (lock) {
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174 addLast (lock);
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175 bool interrupted = false;
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176 while (!lock.done ()) {
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177 try {
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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178 lock.wait ();
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179 } catch (SyncException e) {
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180 interrupted = true;
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181 }
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182 }
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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183 if (interrupted) {
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184 Compatibility.interrupt();
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185 }
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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186 if (lock.throwable !is null) {
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187 DWT.error (DWT.ERROR_FAILED_EXEC, lock.throwable);
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188 }
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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189 }
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
Frank Benoit <benoit@tionex.de>
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190 }
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
Frank Benoit <benoit@tionex.de>
parents:
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191
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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192 }