| /* |
| * Copyright (c) 2005, 2017, 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 java.util.concurrent.locks.*; |
| import sun.management.LockInfoCompositeData; |
| |
| /** |
| * Information about a <em>lock</em>. A lock can be a built-in object monitor, |
| * an <em>ownable synchronizer</em>, or the {@link Condition Condition} |
| * object associated with synchronizers. |
| * <p> |
| * <a id="OwnableSynchronizer">An ownable synchronizer</a> is |
| * a synchronizer that may be exclusively owned by a thread and uses |
| * {@link AbstractOwnableSynchronizer AbstractOwnableSynchronizer} |
| * (or its subclass) to implement its synchronization property. |
| * {@link ReentrantLock ReentrantLock} and the write-lock (but not |
| * the read-lock) of {@link ReentrantReadWriteLock ReentrantReadWriteLock} are |
| * two examples of ownable synchronizers provided by the platform. |
| * |
| * <h3><a id="MappedType">MXBean Mapping</a></h3> |
| * {@code LockInfo} is mapped to a {@link CompositeData CompositeData} |
| * as specified in the {@link #from from} method. |
| * |
| * @see java.util.concurrent.locks.AbstractOwnableSynchronizer |
| * @see java.util.concurrent.locks.Condition |
| * |
| * @author Mandy Chung |
| * @since 1.6 |
| */ |
| |
| public class LockInfo { |
| |
| private String className; |
| private int identityHashCode; |
| |
| /** |
| * Constructs a {@code LockInfo} 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. |
| */ |
| public LockInfo(String className, int identityHashCode) { |
| if (className == null) { |
| throw new NullPointerException("Parameter className cannot be null"); |
| } |
| this.className = className; |
| this.identityHashCode = identityHashCode; |
| } |
| |
| /** |
| * package-private constructors |
| */ |
| LockInfo(Object lock) { |
| this.className = lock.getClass().getName(); |
| this.identityHashCode = System.identityHashCode(lock); |
| } |
| |
| /** |
| * Returns the fully qualified name of the class of the lock object. |
| * |
| * @return the fully qualified name of the class of the lock object. |
| */ |
| public String getClassName() { |
| return className; |
| } |
| |
| /** |
| * Returns the identity hash code of the lock object |
| * returned from the {@link System#identityHashCode} method. |
| * |
| * @return the identity hash code of the lock object. |
| */ |
| public int getIdentityHashCode() { |
| return identityHashCode; |
| } |
| |
| /** |
| * Returns a {@code LockInfo} object represented by the |
| * given {@code CompositeData}. |
| * The given {@code CompositeData} must contain the following attributes: |
| * <table class="striped" style="margin-left:2em;"> |
| * <caption style="display:none">The attributes and the types the given CompositeData contains</caption> |
| * <thead style="text-align:left"> |
| * <tr> |
| * <th scope="col">Attribute Name</th> |
| * <th scope="col">Type</th> |
| * </tr> |
| * </thead> |
| * <tbody style="text-align:left"> |
| * <tr> |
| * <th scope="row">className</th> |
| * <td>{@code java.lang.String}</td> |
| * </tr> |
| * <tr> |
| * <th scope="row">identityHashCode</th> |
| * <td>{@code java.lang.Integer}</td> |
| * </tr> |
| * </tbody> |
| * </table> |
| * |
| * @param cd {@code CompositeData} representing a {@code LockInfo} |
| * |
| * @throws IllegalArgumentException if {@code cd} does not |
| * represent a {@code LockInfo} with the attributes described |
| * above. |
| * @return a {@code LockInfo} object represented |
| * by {@code cd} if {@code cd} is not {@code null}; |
| * {@code null} otherwise. |
| * |
| * @since 1.8 |
| */ |
| public static LockInfo from(CompositeData cd) { |
| if (cd == null) { |
| return null; |
| } |
| |
| if (cd instanceof LockInfoCompositeData) { |
| return ((LockInfoCompositeData) cd).getLockInfo(); |
| } else { |
| return LockInfoCompositeData.toLockInfo(cd); |
| } |
| } |
| |
| /** |
| * Returns a string representation of a lock. The returned |
| * string representation consists of the name of the class of the |
| * lock object, the at-sign character `@', and the unsigned |
| * hexadecimal representation of the <em>identity</em> hash code |
| * of the object. This method returns a string equals to the value of: |
| * <blockquote> |
| * <pre> |
| * lock.getClass().getName() + '@' + Integer.toHexString(System.identityHashCode(lock)) |
| * </pre></blockquote> |
| * where {@code lock} is the lock object. |
| * |
| * @return the string representation of a lock. |
| */ |
| public String toString() { |
| return className + '@' + Integer.toHexString(identityHashCode); |
| } |
| } |