| /* |
| * Copyright (c) 1999, 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 javax.management; |
| |
| // java import |
| import java.io.Serializable; |
| |
| /** |
| * Allows a query to be performed in the context of a specific MBean server. |
| * |
| * @since 1.5 |
| */ |
| public abstract class QueryEval implements Serializable { |
| |
| /* Serial version */ |
| private static final long serialVersionUID = 2675899265640874796L; |
| |
| private static ThreadLocal<MBeanServer> server = |
| new InheritableThreadLocal<MBeanServer>(); |
| |
| /** |
| * <p>Sets the MBean server on which the query is to be performed. |
| * The setting is valid for the thread performing the set. |
| * It is copied to any threads created by that thread at the moment |
| * of their creation.</p> |
| * |
| * <p>For historical reasons, this method is not static, but its |
| * behavior does not depend on the instance on which it is |
| * called.</p> |
| * |
| * @param s The MBean server on which the query is to be performed. |
| * |
| * @see #getMBeanServer |
| */ |
| public void setMBeanServer(MBeanServer s) { |
| server.set(s); |
| } |
| |
| /** |
| * <p>Return the MBean server that was most recently given to the |
| * {@link #setMBeanServer setMBeanServer} method by this thread. |
| * If this thread never called that method, the result is the |
| * value its parent thread would have obtained from |
| * <code>getMBeanServer</code> at the moment of the creation of |
| * this thread, or null if there is no parent thread.</p> |
| * |
| * @return the MBean server. |
| * |
| * @see #setMBeanServer |
| * |
| */ |
| public static MBeanServer getMBeanServer() { |
| return server.get(); |
| } |
| } |