/* * Copyright (c) 2005, 2008, 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.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; } }