/*******************************************************************************
* Copyright (c) 2000, 2011 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdi.internal.event;
import java.io.IOException;
import org.eclipse.jdi.TimeoutException;
import org.eclipse.jdi.internal.MirrorImpl;
import org.eclipse.jdi.internal.VirtualMachineImpl;
import org.eclipse.jdi.internal.connect.PacketReceiveManager;
import org.eclipse.jdi.internal.jdwp.JdwpCommandPacket;
import org.eclipse.jdi.internal.request.RequestID;
import com.sun.jdi.VMDisconnectedException;
import com.sun.jdi.event.EventQueue;
import com.sun.jdi.event.EventSet;
/**
* this class implements the corresponding interfaces declared by the JDI
* specification. See the com.sun.jdi package for more information.
*
*/
public class EventQueueImpl extends MirrorImpl implements EventQueue {
/** Flag used to see if a VMDisconnectEvent has already been generated. */
private boolean genereatedVMDisconnectEvent = false;
/**
* Creates new EventQueueImpl.
*/
public EventQueueImpl(VirtualMachineImpl vmImpl) {
super("EventQueue", vmImpl); //$NON-NLS-1$
}
/*
* @return Returns next EventSet from Virtual Machine.
*/
public EventSet remove() throws InterruptedException {
return remove(PacketReceiveManager.TIMEOUT_INFINITE);
}
/*
* @return Returns next EventSet from Virtual Machine, returns null if times
* out.
*/
public EventSet remove(long timeout) throws InterruptedException {
// Return a received EventSet or null if no EventSet is received in
// time.
// Note that handledJdwpEventSet() is not don in a 'finally' clause
// because
// it must also be done when an 'empty' set is read (i.e. a set composed
// of internal
// events only).
try {
// We remove elements from event sets that are generated from
// inside, therefore the set may become empty.
EventSetImpl set;
do {
JdwpCommandPacket packet = getCommandVM(
JdwpCommandPacket.E_COMPOSITE, timeout);
initJdwpEventSet(packet);
set = EventSetImpl.read(this, packet.dataInStream());
handledJdwpEventSet();
} while (set.isEmpty());
return set;
} catch (TimeoutException e) {
// Timeout in getCommand, JDI spec says return null.
handledJdwpEventSet();
return null;
} catch (IOException e) {
// This means the already received data is invalid.
handledJdwpEventSet();
defaultIOExceptionHandler(e);
return null;
} catch (VMDisconnectedException e) {
// JDI spec says that a VMDisconnectedException must always be
// preceeded by a VMDisconnectEvent.
handledJdwpEventSet();
if (!genereatedVMDisconnectEvent) {
genereatedVMDisconnectEvent = true;
return new EventSetImpl(virtualMachineImpl(),
new VMDisconnectEventImpl(virtualMachineImpl(),
RequestID.nullID));
}
throw e;
}
}
}