| /* |
| * Copyright (c) 2005, 2006, 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 java.lang.management; |
| |
| import javax.management.openmbean.CompositeData; |
| import sun.management.MonitorInfoCompositeData; |
| |
| /** |
| * Information about an object monitor lock. An object monitor is locked |
| * when entering a synchronization block or method on that object. |
| * |
| * <h4>MXBean Mapping</h4> |
| * <tt>MonitorInfo</tt> is mapped to a {@link CompositeData CompositeData} |
| * with attributes as specified in |
| * the {@link #from from} method. |
| * |
| * @author Mandy Chung |
| * @since 1.6 |
| */ |
| public class MonitorInfo extends LockInfo { |
| |
| private int stackDepth; |
| private StackTraceElement stackFrame; |
| |
| /** |
| * Construct a <tt>MonitorInfo</tt> object. |
| * |
| * @param className the fully qualified name of the class of the lock object. |
| * @param identityHashCode the {@link System#identityHashCode |
| * identity hash code} of the lock object. |
| * @param stackDepth the depth in the stack trace where the object monitor |
| * was locked. |
| * @param stackFrame the stack frame that locked the object monitor. |
| * @throws IllegalArgumentException if |
| * <tt>stackDepth</tt> ≥ 0 but <tt>stackFrame</tt> is <tt>null</tt>, |
| * or <tt>stackDepth</tt> < 0 but <tt>stackFrame</tt> is not |
| * <tt>null</tt>. |
| */ |
| public MonitorInfo(String className, |
| int identityHashCode, |
| int stackDepth, |
| StackTraceElement stackFrame) { |
| super(className, identityHashCode); |
| if (stackDepth >= 0 && stackFrame == null) { |
| throw new IllegalArgumentException("Parameter stackDepth is " + |
| stackDepth + " but stackFrame is null"); |
| } |
| if (stackDepth < 0 && stackFrame != null) { |
| throw new IllegalArgumentException("Parameter stackDepth is " + |
| stackDepth + " but stackFrame is not null"); |
| } |
| this.stackDepth = stackDepth; |
| this.stackFrame = stackFrame; |
| } |
| |
| /** |
| * Returns the depth in the stack trace where the object monitor |
| * was locked. The depth is the index to the <tt>StackTraceElement</tt> |
| * array returned in the {@link ThreadInfo#getStackTrace} method. |
| * |
| * @return the depth in the stack trace where the object monitor |
| * was locked, or a negative number if not available. |
| */ |
| public int getLockedStackDepth() { |
| return stackDepth; |
| } |
| |
| /** |
| * Returns the stack frame that locked the object monitor. |
| * |
| * @return <tt>StackTraceElement</tt> that locked the object monitor, |
| * or <tt>null</tt> if not available. |
| */ |
| public StackTraceElement getLockedStackFrame() { |
| return stackFrame; |
| } |
| |
| /** |
| * Returns a <tt>MonitorInfo</tt> object represented by the |
| * given <tt>CompositeData</tt>. |
| * The given <tt>CompositeData</tt> must contain the following attributes |
| * as well as the attributes specified in the |
| * <a href="LockInfo.html#MappedType"> |
| * mapped type</a> for the {@link LockInfo} class: |
| * <blockquote> |
| * <table border> |
| * <tr> |
| * <th align=left>Attribute Name</th> |
| * <th align=left>Type</th> |
| * </tr> |
| * <tr> |
| * <td>lockedStackFrame</td> |
| * <td><tt>CompositeData as specified in the |
| * <a href="ThreadInfo.html#StackTrace">stackTrace</a> |
| * attribute defined in the {@link ThreadInfo#from |
| * ThreadInfo.from} method. |
| * </tt></td> |
| * </tr> |
| * <tr> |
| * <td>lockedStackDepth</td> |
| * <td><tt>java.lang.Integer</tt></td> |
| * </tr> |
| * </table> |
| * </blockquote> |
| * |
| * @param cd <tt>CompositeData</tt> representing a <tt>MonitorInfo</tt> |
| * |
| * @throws IllegalArgumentException if <tt>cd</tt> does not |
| * represent a <tt>MonitorInfo</tt> with the attributes described |
| * above. |
| |
| * @return a <tt>MonitorInfo</tt> object represented |
| * by <tt>cd</tt> if <tt>cd</tt> is not <tt>null</tt>; |
| * <tt>null</tt> otherwise. |
| */ |
| public static MonitorInfo from(CompositeData cd) { |
| if (cd == null) { |
| return null; |
| } |
| |
| if (cd instanceof MonitorInfoCompositeData) { |
| return ((MonitorInfoCompositeData) cd).getMonitorInfo(); |
| } else { |
| MonitorInfoCompositeData.validateCompositeData(cd); |
| String className = MonitorInfoCompositeData.getClassName(cd); |
| int identityHashCode = MonitorInfoCompositeData.getIdentityHashCode(cd); |
| int stackDepth = MonitorInfoCompositeData.getLockedStackDepth(cd); |
| StackTraceElement stackFrame = MonitorInfoCompositeData.getLockedStackFrame(cd); |
| return new MonitorInfo(className, |
| identityHashCode, |
| stackDepth, |
| stackFrame); |
| } |
| } |
| |
| } |
