/* * Copyright (c) 2005, 2013, 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 lock. A lock can be a built-in object monitor, * an ownable synchronizer, or the {@link Condition Condition} * object associated with synchronizers. *
* An ownable synchronizer 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 * {@link ReentrantReadWriteLock ReentrantReadWriteLock} are * two examples of ownable synchronizers provided by the platform. * *
** * @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 identity hash code * of the object. This method returns a string equals to the value of: **
** *Attribute Name *Type ** *className *{@code java.lang.String} ** *identityHashCode *{@code java.lang.Integer} *
** where {@code lock} is the lock object. * * @return the string representation of a lock. */ public String toString() { return className + '@' + Integer.toHexString(identityHashCode); } }* lock.getClass().getName() + '@' + Integer.toHexString(System.identityHashCode(lock)) *