/**************************************************************************
* Copyright (c) 2006 by Chris Gray, /k/ Embedded Java Solutions. *
* All rights reserved. *
* *
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* 1. Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* 2. Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* 3. Neither the name of Chris Gray, /k/ Embedded Java Solutions nor the *
* names of other contributors may be used to endorse or promote *
* products derived from this software without specific prior written *
* permission. *
* *
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. *
* IN NO EVENT SHALL CHRIS GRAY OR OTHER CONTRIBUTORS BE LIABLE *
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF *
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR *
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE *
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN *
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
**************************************************************************/
package wonka.vm;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.util.Vector;
public final class JDWP extends Thread {
private static JDWP theJDWP;
private static native boolean isEnabled();
private static native boolean isRunning();
/** A Vector of WeakReference's to all existing instances of ClassLoader.
*/
private static Vector refsToClassLoaders;
/** A reference queue used to clean up dead WeakReferences.
*/
private static ReferenceQueue refQ;
/** Remove from refsToClassLoaders all references which have been cleared.
*/
private static void purgeClassLoaders() {
synchronized(refsToClassLoaders) {
WeakReference wr = (WeakReference)refQ.poll();
while (wr != null) {
refsToClassLoaders.remove(wr);
wr = (WeakReference)refQ.poll();
}
}
}
/** Add a WeakReference to a ClassLoader to refsToClassLoaders.
*/
public static synchronized void registerClassLoader(ClassLoader cl) {
if (!isEnabled()) {
return;
}
if (refQ == null) {
refQ = new ReferenceQueue();
refsToClassLoaders = new Vector();
}
else {
purgeClassLoaders();
}
refsToClassLoaders.add(new WeakReference(cl, refQ));
}
public static synchronized JDWP getInstance() {
if (theJDWP == null) {
theJDWP = new JDWP();
}
while (!isRunning()) {
try {
Thread.sleep(1000);
}
catch (InterruptedException ie) {
}
}
return theJDWP;
}
private JDWP() {
super("JDWP");
setPriority(10);
setDaemon(true);
start();
}
public native void run();
}