package org.eclipse.jdi.internal.event; | |
/* | |
* (c) Copyright IBM Corp. 2000, 2001. | |
* All Rights Reserved. | |
*/ | |
import com.sun.jdi.*; | |
import com.sun.jdi.event.*; | |
import com.sun.jdi.connect.*; | |
import com.sun.jdi.request.*; | |
import org.eclipse.jdi.TimeoutException; | |
import org.eclipse.jdi.internal.*; | |
import org.eclipse.jdi.internal.connect.*; | |
import org.eclipse.jdi.internal.jdwp.*; | |
import org.eclipse.jdi.internal.request.*; | |
import java.io.*; | |
/** | |
* 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); | |
} | |
/* | |
* @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)); | |
} else { | |
throw e; | |
} | |
} | |
} | |
} |