bundles/org.simantics.g2d/src/org/simantics/g2d/image/impl/AsyncImage.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 package org.simantics.g2d.image.impl;\r
  13 \r
  14 import java.util.EnumSet;\r
  15 import java.util.concurrent.Executor;\r
  16 import java.util.concurrent.LinkedBlockingQueue;\r
  17 import java.util.concurrent.ThreadFactory;\r
  18 import java.util.concurrent.ThreadPoolExecutor;\r
  19 import java.util.concurrent.TimeUnit;\r
  20 \r
  21 import org.simantics.g2d.image.DefaultImages;\r
  22 import org.simantics.g2d.image.Image;\r
  23 import org.simantics.utils.datastructures.cache.IProvider;\r
  24 \r
  25 /**\r
  26  * AsyncImage acquires Image from IProvider asynchronously.\r
  27  * Wait symbol is shown while symbol is acquired.\r
  28  *\r
  29  * @author Toni Kalajainen <toni.kalajainen@vtt.fi>\r
  30  */\r
  31 public class AsyncImage extends ImageProxy {\r
  32 \r
  33     static EnumSet<Feature> caps = EnumSet.of(Feature.Volatile, Feature.Vector);\r
  34 \r
  35     private static ThreadFactory tf = new ThreadFactory() {\r
  36         @Override\r
  37         public Thread newThread(Runnable r) {\r
  38             Thread t = new Thread(new ThreadGroup("Renderer"), r);\r
  39             t.setDaemon(false);\r
  40             return t;\r
  41         }\r
  42     };\r
  43     private static Executor EXECUTOR =\r
  44         new ThreadPoolExecutor(\r
  45                 0,\r
  46                 1,\r
  47                 3L, TimeUnit.SECONDS,\r
  48                 new LinkedBlockingQueue<Runnable>(),\r
  49                 tf);\r
  50 \r
  51     public AsyncImage(final IProvider<Image> imgProvider) {\r
  52         super(DefaultImages.UNKNOWN.get());\r
  53         EXECUTOR.execute(new Runnable() {\r
  54             @Override\r
  55             public void run() {\r
  56                 setSource(DefaultImages.GRAB.get());\r
  57                 setSource(imgProvider.get());\r
  58             }});\r
  59     }\r
  60 \r
  61     @Override\r
  62     public EnumSet<Feature> getFeatures() {\r
  63         return EnumSet.of(Feature.Volatile);\r
  64     }\r
  65 \r
  66 }\r
  67 \r