JDK14/Java14源码在线阅读

/*
 * Copyright (c) 1999, 2017, 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;

import java.lang.System.Logger.Level;
import com.sun.jmx.defaults.JmxProperties;
import com.sun.jmx.defaults.ServiceName;
import com.sun.jmx.mbeanserver.Util;

/**
 * Represents  the MBean server from the management point of view.
 * The MBeanServerDelegate MBean emits the MBeanServerNotifications when
 * an MBean is registered/unregistered in the MBean server.
 *
 * @since 1.5
 */
public class MBeanServerDelegate implements MBeanServerDelegateMBean,
                                            NotificationEmitter   {

    /** The MBean server agent identification.*/
    private String mbeanServerId ;

    /** The NotificationBroadcasterSupport object that sends the
        notifications */
    private final NotificationBroadcasterSupport broadcaster;

    private static long oldStamp = 0;
    private final long stamp;
    private long sequenceNumber = 1;

    private static final MBeanNotificationInfo[] notifsInfo;

    static {
        final String[] types  = {
            MBeanServerNotification.UNREGISTRATION_NOTIFICATION,
            MBeanServerNotification.REGISTRATION_NOTIFICATION
        };
        notifsInfo = new MBeanNotificationInfo[1];
        notifsInfo[0] =
            new MBeanNotificationInfo(types,
                    "javax.management.MBeanServerNotification",
                    "Notifications sent by the MBeanServerDelegate MBean");
    }

    /**
     * Create a MBeanServerDelegate object.
     */
    public MBeanServerDelegate () {
        stamp = getStamp();
        broadcaster = new NotificationBroadcasterSupport() ;
    }


    /**
     * Returns the MBean server agent identity.
     *
     * @return the identity.
     */
    public synchronized String getMBeanServerId() {
        if (mbeanServerId == null) {
            String localHost;
            try {
                localHost = java.net.InetAddress.getLocalHost().getHostName();
            } catch (java.net.UnknownHostException e) {
                JmxProperties.MISC_LOGGER.log(Level.TRACE,
                        "Can't get local host name, " +
                        "using \"localhost\" instead. Cause is: "+e);
                localHost = "localhost";
            }
            mbeanServerId = localHost + "_" + stamp;
        }
        return mbeanServerId;
    }

    /**
     * Returns the full name of the JMX specification implemented
     * by this product.
     *
     * @return the specification name.
     */
    public String getSpecificationName() {
        return ServiceName.JMX_SPEC_NAME;
    }

    /**
     * Returns the version of the JMX specification implemented
     * by this product.
     *
     * @return the specification version.
     */
    public String getSpecificationVersion() {
        return ServiceName.JMX_SPEC_VERSION;
    }

    /**
     * Returns the vendor of the JMX specification implemented
     * by this product.
     *
     * @return the specification vendor.
     */
    public String getSpecificationVendor() {
        return ServiceName.JMX_SPEC_VENDOR;
    }

    /**
     * Returns the JMX implementation name (the name of this product).
     *
     * @return the implementation name.
     */
    public String getImplementationName() {
        return ServiceName.JMX_IMPL_NAME;
    }

    /**
     * Returns the JMX implementation version (the version of this product).
     *
     * @return the implementation version.
     */
    public String getImplementationVersion() {
        try {
            return System.getProperty("java.runtime.version");
        } catch (SecurityException e) {
            return "";
        }
    }

    /**
     * Returns the JMX implementation vendor (the vendor of this product).
     *
     * @return the implementation vendor.
     */
    public String getImplementationVendor()  {
        return ServiceName.JMX_IMPL_VENDOR;
    }

    // From NotificationEmitter extends NotificationBroacaster
    //
    public MBeanNotificationInfo[] getNotificationInfo() {
        final int len = MBeanServerDelegate.notifsInfo.length;
        final MBeanNotificationInfo[] infos =
        new MBeanNotificationInfo[len];
        System.arraycopy(MBeanServerDelegate.notifsInfo,0,infos,0,len);
        return infos;
    }

    // From NotificationEmitter extends NotificationBroacaster
    //
    public synchronized
        void addNotificationListener(NotificationListener listener,
                                     NotificationFilter filter,
                                     Object handback)
        throws IllegalArgumentException {
        broadcaster.addNotificationListener(listener,filter,handback) ;
    }

    // From NotificationEmitter extends NotificationBroacaster
    //
    public synchronized
        void removeNotificationListener(NotificationListener listener,
                                        NotificationFilter filter,
                                        Object handback)
        throws ListenerNotFoundException {
        broadcaster.removeNotificationListener(listener,filter,handback) ;
    }

    // From NotificationEmitter extends NotificationBroacaster
    //
    public synchronized
        void removeNotificationListener(NotificationListener listener)
        throws ListenerNotFoundException {
        broadcaster.removeNotificationListener(listener) ;
    }

    /**
     * Enables the MBean server to send a notification.
     * If the passed <var>notification</var> has a sequence number lesser
     * or equal to 0, then replace it with the delegate's own sequence
     * number.
     * @param notification The notification to send.
     *
     */
    public void sendNotification(Notification notification) {
        if (notification.getSequenceNumber() < 1) {
            synchronized (this) {
                notification.setSequenceNumber(this.sequenceNumber++);
            }
        }
        broadcaster.sendNotification(notification);
    }

    /**

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