bundles/org.simantics.utils.thread.swt/src/org/simantics/utils/threads/SWTThread.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 /*\r
  13  *\r
  14  * @author Toni Kalajainen\r
  15  */\r
  16 package org.simantics.utils.threads;\r
  17 \r
  18 import java.util.concurrent.Executor;\r
  19 \r
  20 import org.eclipse.swt.widgets.Display;\r
  21 import org.eclipse.swt.widgets.Widget;\r
  22 \r
  23 public class SWTThread implements IThreadWorkQueue, Executor {\r
  24 \r
  25         final Display display;\r
  26         \r
  27         public static IThreadWorkQueue getThreadAccess(Display display)\r
  28         {\r
  29                 return new SWTThread(display);\r
  30         }\r
  31         \r
  32         public static IThreadWorkQueue getThreadAccess(Widget widget)\r
  33         {\r
  34                 return new SWTThread(widget.getDisplay());\r
  35         }\r
  36         \r
  37         public static IThreadWorkQueue getThreadAccess() {\r
  38                 return new SWTThread(Display.getDefault());\r
  39         }\r
  40         \r
  41         SWTThread(Display display)\r
  42         {\r
  43                 this.display = display;\r
  44         }\r
  45         \r
  46         @Override\r
  47         public Thread asyncExec(Runnable runnable) {\r
  48                 // Don't accept work if the SWT thread is disposed.\r
  49                 if (display.isDisposed())\r
  50                         return null;\r
  51                 display.asyncExec(runnable);\r
  52                 return display.getThread();\r
  53         }\r
  54 \r
  55         @Override\r
  56         public boolean syncExec(Runnable runnable) {\r
  57                 // Don't accept work if the SWT thread is disposed.\r
  58                 if (display.isDisposed())\r
  59                         return false;\r
  60                 if (display.getThread() == Thread.currentThread ())\r
  61                         runnable.run();\r
  62                 else \r
  63                         display.syncExec(runnable);\r
  64                 return true;\r
  65         }\r
  66 \r
  67         @Override\r
  68         public boolean currentThreadAccess() {\r
  69                 // A disposed SWT thread can never be the current thread access\r
  70                 if (display.isDisposed())\r
  71                         return false;\r
  72                 return display.getThread() == Thread.currentThread ();\r
  73         }\r
  74 \r
  75         @Override\r
  76         public Thread getThread() {\r
  77                 // Use null to indicate disposed SWT thread.\r
  78                 if (display.isDisposed())\r
  79                         return null;\r
  80                 return display.getThread();\r
  81         }\r
  82         \r
  83         @Override\r
  84         public String toString() {\r
  85                 return "SWT Thread";\r
  86         }\r
  87 \r
  88         @Override\r
  89         public void execute(Runnable command) {\r
  90                 syncExec(command);\r
  91         }\r
  92 }\r