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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/**
 * 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>();

    
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.
For historical reasons, this method is not static, but its
behavior does not depend on the instance on which it is
called.
Params:
s – The MBean server on which the query is to be performed.
See Also:
getMBeanServer/**
     * <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);
    }

    
Return the MBean server that was most recently given to the setMBeanServer method by this thread. If this thread never called that method, the result is the value its parent thread would have obtained from getMBeanServer at the moment of the creation of
this thread, or null if there is no parent thread.
See Also:
setMBeanServer
Returns:
the MBean server./**
     * <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();
    }
}