Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.utils.thread / src / org / simantics / utils / threads / WorkerThread.java

diff --git a/bundles/org.simantics.utils.thread/src/org/simantics/utils/threads/WorkerThread.java b/bundles/org.simantics.utils.thread/src/org/simantics/utils/threads/WorkerThread.java
new file mode 100644 (file)
index 0000000..a48187b
--- /dev/null
+++ b/bundles/org.simantics.utils.thread/src/org/simantics/utils/threads/WorkerThread.java
@@ -0,0 +1,124 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+/*\r
+ *\r
+ * @author Toni Kalajainen\r
+ */\r
+package org.simantics.utils.threads;\r
+\r
+import java.util.LinkedList;\r
+import java.util.concurrent.Semaphore;\r
+\r
+import org.simantics.utils.threads.internal.Pair;\r
+\r
+\r
+/**\r
+ * Thread manager\r
+ * \r
+ * TODO Replace with ScheduledThreadPoolExecutor\r
+ */\r
+public class WorkerThread extends Thread implements IThreadWorkQueue {\r
+\r
+    LinkedList<Pair<Runnable, Semaphore>> list         = new LinkedList<Pair<Runnable, Semaphore>>();\r
+\r
+    boolean                               stop         = false;\r
+\r
+    Semaphore                             finishPermit = new Semaphore(0);\r
+\r
+    public WorkerThread() {\r
+        super();\r
+    }\r
+    \r
+    public WorkerThread(String name) {\r
+        super(name);\r
+    }\r
+    \r
+    public void stopDispatchingEvents(boolean blockUntilCompleted) {\r
+        synchronized (this) {\r
+            stop = true;\r
+            notify();\r
+        }\r
+        if (blockUntilCompleted) {\r
+            try {\r
+                finishPermit.acquire();\r
+            } catch (InterruptedException e) {\r
+            }\r
+        }\r
+    }\r
+\r
+    @Override\r
+    public void run() {\r
+        try {\r
+            while (!stop) {\r
+                while (true) {\r
+                    Pair<Runnable, Semaphore> p = null;\r
+                    synchronized (this) {\r
+                        if(list.isEmpty())\r
+                            break;\r
+                        p = list.pop();\r
+                    }                                         \r
+                    Runnable r = p.first;\r
+                    try {\r
+                        r.run();\r
+                    } catch (RuntimeException rte) {\r
+                        rte.printStackTrace();\r
+                    }\r
+                    if (p.second != null)\r
+                        p.second.release(1);\r
+                }\r
+                synchronized (this) {\r
+                    if (!stop)\r
+                        try {\r
+                            wait(10000L);\r
+                        } catch (InterruptedException e) {\r
+                        }\r
+                }\r
+            }\r
+        } finally {\r
+            finishPermit.release();\r
+        }\r
+    }\r
+\r
+    @Override\r
+    public boolean syncExec(Runnable runnable) {\r
+        Semaphore s = new Semaphore(0);\r
+        synchronized (this) {\r
+            if (stop)\r
+                return false;\r
+            Pair<Runnable, Semaphore> p = new Pair<Runnable, Semaphore>(runnable, s);\r
+            list.addFirst(p);\r
+            notify();\r
+        }\r
+        return true;\r
+    }\r
+\r
+    @Override\r
+    public synchronized Thread asyncExec(Runnable runnable) {\r
+        if (stop)\r
+            return null;\r
+        Pair<Runnable, Semaphore> p = new Pair<Runnable, Semaphore>(runnable, new Semaphore(0));\r
+        list.addLast(p);\r
+        notify();\r
+        return this;\r
+    }\r
+\r
+    @Override\r
+    public boolean currentThreadAccess() {\r
+        return Thread.currentThread() == this;\r
+    }\r
+\r
+    @Override\r
+    public Thread getThread() {\r
+        return this;\r
+    }\r
+\r
+}\r