/*
* Copyright (c) 1999, 2007, 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.
*
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*/
package javax.management;
// java import
import java.io.Serializable;
// RI import
import javax.management.MBeanServer;
/**
* 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();
}
}