[Jnode-svn-commits] SF.net SVN: jnode: [4027] trunk/core/src/test/org/jnode/test/threads/ DaemonThreadGroupTest.java

[<cr...@us...>]

Revision: 4027
          http://jnode.svn.sourceforge.net/jnode/?rev=4027&view=rev
Author:   crawley
Date:     2008-04-26 23:58:47 -0700 (Sat, 26 Apr 2008)

Log Message:
-----------
Testcase for behaviour of daemon ThreadGroups.

Added Paths:
-----------
    trunk/core/src/test/org/jnode/test/threads/DaemonThreadGroupTest.java

Added: trunk/core/src/test/org/jnode/test/threads/DaemonThreadGroupTest.java
===================================================================
--- trunk/core/src/test/org/jnode/test/threads/DaemonThreadGroupTest.java	                        (rev 0)
+++ trunk/core/src/test/org/jnode/test/threads/DaemonThreadGroupTest.java	2008-04-27 06:58:47 UTC (rev 4027)
@@ -0,0 +1,105 @@
+/*
+ * $Id: BasicTest.java 2224 2006-01-01 12:49:03Z epr $
+ *
+ * JNode.org
+ * Copyright (C) 2008 JNode.org
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but 
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; If not, write to the Free Software Foundation, Inc., 
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+package org.jnode.test.threads;
+
+/**
+ * Test the behaviour of daemon ThreadGroups.  Literally, the javadoc says that 
+ * a daemon ThreadGroup is destroyed when the last active thread is "stopped".
+ * But it really means when it "dies".  There is also the issue of unstarted
+ * Threads; do they prevent a daemon ThreadGroup from being destroyed?
+ * 
+ * @author cr...@jn...
+ */
+public class DaemonThreadGroupTest {
+    
+    public static class BarbieThread extends Thread {
+
+        public BarbieThread(ThreadGroup tg) {
+            super(tg, "barbie");
+        }
+
+        @Override
+        public void run() {
+            // (Don't ask ...)
+            try {
+                sleep(3000);
+            }
+            catch (InterruptedException ex) {
+                System.err.println("Barbie: \"what?\"");
+            }
+            System.err.println("Barbie: \"I'm a Barbie girl, in a Barbie world\"");
+            System.err.println("Barbie: \"zzzzzzz ....\"");
+            try {
+                sleep(3000);
+            }
+            catch (InterruptedException ex) {
+                System.err.println("Barbie: \"what?\"");
+            }
+            System.err.println("Barbie: \"Made of plastic, life is so fantastic\"");
+        }
+    }
+    
+    private static void threadGroupTest(ThreadGroup tg1, ThreadGroup tg2, boolean expectDeath) 
+    throws Exception {
+        if (tg1.isDestroyed() || tg2.isDestroyed()) {
+            System.err.println("ERROR: already destroyed");
+            return;
+        }
+        BarbieThread bt = new BarbieThread(tg2);
+        bt.start();
+        if (tg1.isDestroyed()) {
+            System.err.println("ERROR: destroyed too soon");
+            return;
+        }
+        
+        bt.join();
+            
+        System.err.println("Bye bye Barbie");
+        if (tg1.isDestroyed() != expectDeath) {
+            System.err.println("ERROR: tg1.isDestroyed() (" + tg1.isDestroyed() + 
+                    ") != expectDeath (" + expectDeath + ")");
+        }
+    }
+
+    /**
+     * @param args
+     */
+    public static void main(String[] args) throws Exception {
+        System.err.println("First test: non-daemon group");
+        ThreadGroup tg = new ThreadGroup("test1");
+        tg.setDaemon(false);
+        threadGroupTest(tg, tg, false);
+        
+        System.err.println("Second test: daemon group");
+        tg = new ThreadGroup("test2");
+        tg.setDaemon(true);
+        threadGroupTest(tg, tg, true);
+        
+        System.err.println("Third test: daemon group with child group");
+        tg = new ThreadGroup("test3");
+        ThreadGroup tg2 = new ThreadGroup(tg, "child");
+        tg.setDaemon(true);
+        tg2.setDaemon(true);
+        threadGroupTest(tg, tg2, true);
+        
+        System.err.println("Done");
+    }
+}


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