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	/*
	* Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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 General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* This source code is provided to illustrate the usage of a given feature
	* or technique and has been deliberately simplified. Additional steps
	* required for a production-quality application, such as security checks,
	* input validation and proper error handling, might not be present in
	* this sample code.
	*/


	package com.sun.tools.example.debug.bdi;

	import com.sun.jdi.*;
	import com.sun.jdi.event.*;

	import com.sun.tools.example.debug.event.*;

	import javax.swing.SwingUtilities;

	/**
	*/
	class JDIEventSource extends Thread {

	private /final/ EventQueue queue;
	private /final/ Session session;
	private /final/ ExecutionManager runtime;
	private final JDIListener firstListener = new FirstListener();

	private boolean wantInterrupt; //### Hack

	/**
	* Create event source.
	*/
	JDIEventSource(Session session) {
	super("JDI Event Set Dispatcher");
	this.session = session;
	this.runtime = session.runtime;
	this.queue = session.vm.eventQueue();
	}

	@Override
	public void run() {
	try {
	runLoop();
	} catch (Exception exc) {
	//### Do something different for InterruptedException???
	// just exit
	}
	session.running = false;
	}

	private void runLoop() throws InterruptedException {
	AbstractEventSet es;
	do {
	EventSet jdiEventSet = queue.remove();
	es = AbstractEventSet.toSpecificEventSet(jdiEventSet);
	session.interrupted = es.suspendedAll();
	dispatchEventSet(es);
	} while(!(es instanceof VMDisconnectEventSet));
	}

	//### Gross foul hackery!
	private void dispatchEventSet(final AbstractEventSet es) {
	SwingUtilities.invokeLater(new Runnable() {
	@Override
	public void run() {
	boolean interrupted = es.suspendedAll();
	es.notify(firstListener);
	boolean wantInterrupt = JDIEventSource.this.wantInterrupt;
	for (JDIListener jl : session.runtime.jdiListeners) {
	es.notify(jl);
	}
	if (interrupted && !wantInterrupt) {
	session.interrupted = false;
	//### Catch here is a hack
	try {
	session.vm.resume();
	} catch (VMDisconnectedException ee) {}
	}
	if (es instanceof ThreadDeathEventSet) {
	ThreadReference t = ((ThreadDeathEventSet)es).getThread();
	session.runtime.removeThreadInfo(t);
	}
	}
	});
	}

	private void finalizeEventSet(AbstractEventSet es) {
	if (session.interrupted && !wantInterrupt) {
	session.interrupted = false;
	//### Catch here is a hack
	try {
	session.vm.resume();
	} catch (VMDisconnectedException ee) {}
	}
	if (es instanceof ThreadDeathEventSet) {
	ThreadReference t = ((ThreadDeathEventSet)es).getThread();
	session.runtime.removeThreadInfo(t);
	}
	}

	//### This is a Hack, deal with it
	private class FirstListener implements JDIListener {

	@Override
	public void accessWatchpoint(AccessWatchpointEventSet e) {
	session.runtime.validateThreadInfo();
	wantInterrupt = true;
	}

	@Override
	public void classPrepare(ClassPrepareEventSet e) {
	wantInterrupt = false;
	runtime.resolve(e.getReferenceType());
	}

	@Override
	public void classUnload(ClassUnloadEventSet e) {
	wantInterrupt = false;
	}

	@Override
	public void exception(ExceptionEventSet e) {
	wantInterrupt = true;
	}

	@Override
	public void locationTrigger(LocationTriggerEventSet e) {
	session.runtime.validateThreadInfo();
	wantInterrupt = true;
	}

	@Override
	public void modificationWatchpoint(ModificationWatchpointEventSet e) {
	session.runtime.validateThreadInfo();
	wantInterrupt = true;
	}

	@Override
	public void threadDeath(ThreadDeathEventSet e) {
	wantInterrupt = false;
	}

	@Override
	public void threadStart(ThreadStartEventSet e) {
	wantInterrupt = false;
	}

	@Override
	public void vmDeath(VMDeathEventSet e) {
	//### Should have some way to notify user
	//### that VM died before the session ended.
	wantInterrupt = false;
	}

	@Override
	public void vmDisconnect(VMDisconnectEventSet e) {
	//### Notify user?
	wantInterrupt = false;
	session.runtime.endSession();
	}

	@Override
	public void vmStart(VMStartEventSet e) {
	//### Do we need to do anything with it?
	wantInterrupt = false;
	}
	}
	}

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