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/*
* Copyright (c) 1998, 2002, 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.
*/
package com.sun.tools.example.debug.bdi;
import com.sun.jdi.*;
//### Should handle target VM death or connection failure cleanly.
public class ThreadInfo {
private ThreadReference thread;
private int status;
private int frameCount;
Object userObject; // User-supplied annotation.
private boolean interrupted = false;
private void assureInterrupted() throws VMNotInterruptedException {
if (!interrupted) {
throw new VMNotInterruptedException();
}
}
ThreadInfo (ThreadReference thread) {
this.thread = thread;
this.frameCount = -1;
}
public ThreadReference thread() {
return thread;
}
public int getStatus() throws VMNotInterruptedException {
assureInterrupted();
update();
return status;
}
public int getFrameCount() throws VMNotInterruptedException {
assureInterrupted();
update();
return frameCount;
}
public StackFrame getFrame(int index) throws VMNotInterruptedException {
assureInterrupted();
update();
try {
return thread.frame(index);
} catch (IncompatibleThreadStateException e) {
// Should not happen
interrupted = false;
throw new VMNotInterruptedException();
}
}
public Object getUserObject() {
return userObject;
}
public void setUserObject(Object obj) {
userObject = obj;
}
// Refresh upon first access after cache is cleared.
void update() throws VMNotInterruptedException {
if (frameCount == -1) {
try {
status = thread.status();
frameCount = thread.frameCount();
} catch (IncompatibleThreadStateException e) {
// Should not happen
interrupted = false;
throw new VMNotInterruptedException();
}
}
}
// Called from 'ExecutionManager'.
void validate() {
interrupted = true;
}
void invalidate() {
interrupted = false;
frameCount = -1;
status = ThreadReference.THREAD_STATUS_UNKNOWN;
}
}
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