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annotate dwt/widgets/Synchronizer.d @ 128:07399639c0c8

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Added DWT extension to dwt.widgets.MessageBox
author Jacob Carlborg <doob@me.com>
date Sat, 17 Jan 2009 16:26:49 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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 * Port to the D programming language:
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12 * Jacob Carlborg <doob@me.com>
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13 *******************************************************************************/
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14 module dwt.widgets.Synchronizer;
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16
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17 import dwt.DWT;
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18 import dwt.DWTException;
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19 import dwt.graphics.Device;
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20 import dwt.internal.Compatibility;
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22 import tango.core.Thread;
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23 import tango.core.Exception;
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25 import dwt.dwthelper.utils;
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26 import dwt.widgets.Display;
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27 import dwt.widgets.RunnableLock;
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29 /**
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30 * Instances of this class provide synchronization support
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31 * for displays. A default instance is created automatically
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32 * for each display, and this instance is sufficient for almost
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33 * all applications.
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34 * <p>
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35 * <b>IMPORTANT:</b> Typical application code <em>never</em>
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36 * needs to deal with this class. It is provided only to
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37 * allow applications which require non-standard
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38 * synchronization behavior to plug in the support they
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39 * require. <em>Subclasses which override the methods in
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40 * this class must ensure that the superclass methods are
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41 * invoked in their implementations</em>
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42 * </p>
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43 *
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44 * @see Display#setSynchronizer
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45 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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46 */
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47 public class Synchronizer {
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48 Display display;
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49 int messageCount;
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50 RunnableLock [] messages;
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51 Object messageLock;
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52 Thread syncThread;
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53 static const int GROW_SIZE = 4;
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54 static const int MESSAGE_LIMIT = 64;
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56 //TEMPORARY CODE
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57 static const bool IS_CARBON = "carbon".equals (DWT.getPlatform ());
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58
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59 /**
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60 * Constructs a new instance of this class.
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61 *
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62 * @param display the display to create the synchronizer on
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63 */
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64 public this (Display display) {
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65 this.display = display;
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66 messageLock = new Object ();
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67 }
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68
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69 void addLast (RunnableLock lock) {
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70 bool wake = false;
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71 synchronized (messageLock) {
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72 if (messages is null) messages = new RunnableLock [GROW_SIZE];
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73 if (messageCount is messages.length) {
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74 RunnableLock[] newMessages = new RunnableLock [messageCount + GROW_SIZE];
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75 System.arraycopy (messages, 0, newMessages, 0, messageCount);
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76 messages = newMessages;
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77 }
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78 messages [messageCount++] = lock;
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79 wake = messageCount is 1;
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80 }
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81 if (wake) display.wakeThread ();
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82 }
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83
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84 /**
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85 * Causes the <code>run()</code> method of the runnable to
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86 * be invoked by the user-interface thread at the next
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87 * reasonable opportunity. The caller of this method continues
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88 * to run in parallel, and is not notified when the
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89 * runnable has completed.
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90 *
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91 * @param runnable code to run on the user-interface thread.
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92 *
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93 * @see #syncExec
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94 */
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95 public void asyncExec (Runnable runnable) {
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96 if (runnable is null) {
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97 //TEMPORARY CODE
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98 if (!IS_CARBON) {
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99 display.wake ();
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100 return;
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101 }
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102 }
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103 addLast (new RunnableLock (runnable));
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104 }
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105
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106 int getMessageCount () {
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107 synchronized (messageLock) {
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108 return messageCount;
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109 }
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110 }
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111
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112 void releaseSynchronizer () {
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113 display = null;
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114 messages = null;
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115 messageLock = null;
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116 syncThread = null;
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117 }
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118
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119 RunnableLock removeFirst () {
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120 synchronized (messageLock) {
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121 if (messageCount is 0) return null;
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122 RunnableLock lock = messages [0];
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123 System.arraycopy (messages, 1, messages, 0, --messageCount);
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124 messages [messageCount] = null;
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125 if (messageCount is 0) {
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126 if (messages.length > MESSAGE_LIMIT) messages = null;
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127 }
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128 return lock;
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129 }
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130 }
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131
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132 bool runAsyncMessages () {
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133 return runAsyncMessages (false);
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134 }
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135
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136 bool runAsyncMessages (bool all) {
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137 bool run = false;
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138 do {
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139 RunnableLock lock = removeFirst ();
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140 if (lock is null) return run;
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141 run = true;
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142 synchronized (lock) {
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143 syncThread = lock.thread;
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144 try {
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145 lock.run ();
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146 } catch (Throwable t) {
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147 lock.throwable = t;
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148 DWT.error (DWT.ERROR_FAILED_EXEC, t);
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149 } finally {
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150 syncThread = null;
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151 lock.notifyAll ();
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152 }
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153 }
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154 } while (all);
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155 return run;
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156 }
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157
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158 /**
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159 * Causes the <code>run()</code> method of the runnable to
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160 * be invoked by the user-interface thread at the next
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161 * reasonable opportunity. The thread which calls this method
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162 * is suspended until the runnable completes.
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163 *
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164 * @param runnable code to run on the user-interface thread.
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165 *
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166 * @exception DWTException <ul>
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167 * <li>ERROR_FAILED_EXEC - if an exception occurred when executing the runnable</li>
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168 * </ul>
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169 *
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170 * @see #asyncExec
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171 */
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172 public void syncExec (Runnable runnable) {
0
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173 RunnableLock lock = null;
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174 synchronized (Device.classinfo) {
0
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175 if (display is null || display.isDisposed ()) DWT.error (DWT.ERROR_DEVICE_DISPOSED);
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176 if (!display.isValidThread ()) {
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177 if (runnable is null) {
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178 display.wake ();
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179 return;
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180 }
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181 lock = new RunnableLock (runnable);
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182 /*
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183 * Only remember the syncThread for syncExec.
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184 */
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185 lock.thread = Thread.getThis();
0
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186 addLast (lock);
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187 }
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188 }
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189 if (lock is null) {
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190 if (runnable !is null) runnable.run ();
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191 return;
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192 }
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193 synchronized (lock) {
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194 bool interrupted = false;
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195 while (!lock.done ()) {
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196 try {
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197 lock.wait ();
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198 } catch (InterruptedException e) {
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199 interrupted = true;
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200 }
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201 }
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202 if (interrupted) {
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203 Compatibility.interrupt();
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204 }
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205 if (lock.throwable !is null) {
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206 DWT.error (DWT.ERROR_FAILED_EXEC, lock.throwable);
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207 }
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208 }
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209 }
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210
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211 }