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| 1 | +/* | |
| 2 | + * Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package javax.management; | |
| 27 | + | |
| 28 | +// java import | |
| 29 | +import java.io.Serializable; | |
| 30 | + | |
| 31 | +/** | |
| 32 | + * Allows a query to be performed in the context of a specific MBean server. | |
| 33 | + * | |
| 34 | + * @since 1.5 | |
| 35 | + */ | |
| 36 | +public abstract class QueryEval implements Serializable { | |
| 37 | + | |
| 38 | + /* Serial version */ | |
| 39 | + private static final long serialVersionUID = 2675899265640874796L; | |
| 40 | + | |
| 41 | + private static ThreadLocal<MBeanServer> server = | |
| 42 | + new InheritableThreadLocal<MBeanServer>(); | |
| 43 | + | |
| 44 | + /** | |
| 45 | + * <p>Sets the MBean server on which the query is to be performed. | |
| 46 | + * The setting is valid for the thread performing the set. | |
| 47 | + * It is copied to any threads created by that thread at the moment | |
| 48 | + * of their creation.</p> | |
| 49 | + * | |
| 50 | + * <p>For historical reasons, this method is not static, but its | |
| 51 | + * behavior does not depend on the instance on which it is | |
| 52 | + * called.</p> | |
| 53 | + * | |
| 54 | + * @param s The MBean server on which the query is to be performed. | |
| 55 | + * | |
| 56 | + * @see #getMBeanServer | |
| 57 | + */ | |
| 58 | + public void setMBeanServer(MBeanServer s) { | |
| 59 | + server.set(s); | |
| 60 | + } | |
| 61 | + | |
| 62 | + /** | |
| 63 | + * <p>Return the MBean server that was most recently given to the | |
| 64 | + * {@link #setMBeanServer setMBeanServer} method by this thread. | |
| 65 | + * If this thread never called that method, the result is the | |
| 66 | + * value its parent thread would have obtained from | |
| 67 | + * <code>getMBeanServer</code> at the moment of the creation of | |
| 68 | + * this thread, or null if there is no parent thread.</p> | |
| 69 | + * | |
| 70 | + * @return the MBean server. | |
| 71 | + * | |
| 72 | + * @see #setMBeanServer | |
| 73 | + * | |
| 74 | + */ | |
| 75 | + public static MBeanServer getMBeanServer() { | |
| 76 | + return server.get(); | |
| 77 | + } | |
| 78 | +} | |