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/*
* Copyright 2005 Sun Microsystems, Inc. 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. 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
* have any questions.
*/
package com.sun.tools.jdi;
import com.sun.jdi.*;
public class MonitorInfoImpl extends MirrorImpl
implements MonitorInfo, ThreadListener {
/* Once false, monitorInfo should not be used.
* access synchronized on (vm.state())
*/
private boolean isValid = true;
ObjectReference monitor;
ThreadReference thread;
int stack_depth;
MonitorInfoImpl(VirtualMachine vm, ObjectReference mon,
ThreadReferenceImpl thread, int dpth) {
super(vm);
this.monitor = mon;
this.thread = thread;
this.stack_depth = dpth;
thread.addListener(this);
}
/*
* ThreadListener implementation
* Must be synchronized since we must protect against
* sending defunct (isValid == false) stack ids to the back-end.
*/
public boolean threadResumable(ThreadAction action) {
synchronized (vm.state()) {
if (isValid) {
isValid = false;
return false; /* remove this stack frame as a listener */
} else {
throw new InternalException(
"Invalid stack frame thread listener");
}
}
}
private void validateMonitorInfo() {
if (!isValid) {
throw new InvalidStackFrameException("Thread has been resumed");
}
}
public ObjectReference monitor() {
validateMonitorInfo();
return monitor;
}
public int stackDepth() {
validateMonitorInfo();
return stack_depth;
}
public ThreadReference thread() {
validateMonitorInfo();
return thread;
}
}
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