bundles/org.simantics.simulator.variable/src/org/simantics/simulator/variable/impl/SimpleRealm.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2013 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  *     Semantum Oy - initial API and implementation\r
  12  *******************************************************************************/\r
  13 package org.simantics.simulator.variable.impl;\r
  14 \r
  15 import java.util.ArrayDeque;\r
  16 import java.util.concurrent.CountDownLatch;\r
  17 import java.util.concurrent.Semaphore;\r
  18 import java.util.concurrent.TimeUnit;\r
  19 \r
  20 import org.simantics.simulator.variable.Realm;\r
  21 \r
  22 public class SimpleRealm implements Realm {\r
  23 \r
  24         private ArrayDeque<Runnable> tasks = new ArrayDeque<Runnable>();\r
  25         private Semaphore taskCount = new Semaphore(0);\r
  26 \r
  27         public void executeTasks() {            \r
  28                 while(taskCount.tryAcquire()) {\r
  29                         Runnable task;\r
  30                         synchronized (tasks) {\r
  31                                 task = tasks.poll();\r
  32                         }\r
  33                         task.run();\r
  34                 }\r
  35         }\r
  36          \r
  37         public void waitTasks(long waitDuration) throws InterruptedException {\r
  38                 taskCount.tryAcquire(waitDuration, TimeUnit.MILLISECONDS);\r
  39         }\r
  40         \r
  41         @Override\r
  42         public void syncExec(final Runnable runnable) throws InterruptedException {\r
  43                 final CountDownLatch latch = new CountDownLatch(1);\r
  44                 asyncExec(new Runnable() {\r
  45                         @Override\r
  46                         public void run() {\r
  47                                 runnable.run();\r
  48                                 latch.countDown();\r
  49                         }                       \r
  50                 });\r
  51                 latch.await();\r
  52         }\r
  53 \r
  54         @Override\r
  55         public void asyncExec(Runnable runnable) {\r
  56                 synchronized (tasks) {\r
  57                         tasks.add(runnable);                    \r
  58                 }\r
  59                 taskCount.release();\r
  60         }\r
  61 \r
  62 }\r