bundles/org.simantics.utils.thread/src/org/simantics/utils/threads/ExecutorWorker.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 /*
  13  *
  14  * @author Toni Kalajainen
  15  */
  16 package org.simantics.utils.threads;
  17
  18 import java.util.concurrent.Callable;
  19 import java.util.concurrent.ScheduledFuture;
  20 import java.util.concurrent.ScheduledThreadPoolExecutor;
  21 import java.util.concurrent.TimeUnit;
  22
  23
  24 public class ExecutorWorker {
  25
  26         private static ExecutorWorker instance;
  27
  28         static class DelayedExecution implements Comparable<DelayedExecution> {
  29                 Executable executable;
  30                 long executionTime;
  31                 @Override
  32                 public int compareTo(DelayedExecution o) {
  33                         if (o.executionTime<executionTime) return -1;
  34                         if (o.executionTime>executionTime) return 1;
  35                         return 0;
  36                 }
  37         }
  38
  39         public static ExecutorWorker getInstance()
  40         {
  41                 if (instance == null)
  42                         instance = new ExecutorWorker();
  43                 return instance;
  44         }
  45
  46         ExecutorWorker() {
  47         }
  48
  49         ScheduledThreadPoolExecutor pool = new ScheduledThreadPoolExecutor(1);
  50
  51         public synchronized ScheduledFuture<Object> timerExec(final Executable executable, int delay)
  52         {
  53                 Callable<Object> c = new Callable<Object>() {
  54                         @Override
  55                         public Object call() throws Exception {
  56                 // FIXME: executable.runnable gets called twice!
  57                                 ThreadUtils.asyncExec(executable.threadAccess, executable.runnable);
  58                                 //executable.runnable.run();
  59                                 return null;
  60                         }
  61                 };
  62                 return pool.schedule(c, delay, TimeUnit.MILLISECONDS);
  63         }
  64
  65 }