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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 | } | ||