/*

 * 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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

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 */

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

import com.sun.jdi.*;

import com.sun.jdi.event.*;

import java.util.*;

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();

    }

    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() {

            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 {

        public void accessWatchpoint(AccessWatchpointEventSet e) {

            session.runtime.validateThreadInfo();

            wantInterrupt = true;

        }

        public void classPrepare(ClassPrepareEventSet e)  {

            wantInterrupt = false;

            runtime.resolve(e.getReferenceType());

        }

        public void classUnload(ClassUnloadEventSet e)  {

            wantInterrupt = false;

        }

        public void exception(ExceptionEventSet e)  {

            wantInterrupt = true;

        }

        public void locationTrigger(LocationTriggerEventSet e)  {

            session.runtime.validateThreadInfo();

            wantInterrupt = true;

        }

        public void modificationWatchpoint(ModificationWatchpointEventSet e)  {

            session.runtime.validateThreadInfo();

            wantInterrupt = true;

        }

        public void threadDeath(ThreadDeathEventSet e)  {

            wantInterrupt = false;

        }

        public void threadStart(ThreadStartEventSet e)  {

            wantInterrupt = false;

        }

        public void vmDeath(VMDeathEventSet e)  {

            //### Should have some way to notify user

            //### that VM died before the session ended.

            wantInterrupt = false;

        }

        public void vmDisconnect(VMDisconnectEventSet e)  {

            //### Notify user?

            wantInterrupt = false;

            session.runtime.endSession();

        }

        public void vmStart(VMStartEventSet e)  {

            //### Do we need to do anything with it?

            wantInterrupt = false;

        }

    }

}