MBeanServer creation - Java Java Virtual Machine

Description

MBeanServer creation
/*
 * Main.java - main class for the Hello MBean and QueueSampler MXBean example.
 * Create the Hello MBean and QueueSampler MXBean, register them in the platform
 * MBean server, then wait forever (or until the program is interrupted).
 */

import java.beans.ConstructorProperties;
import java.util.Date;
import java.lang.management.ManagementFactory;
import java.util.Queue;
import java.util.concurrent.ArrayBlockingQueue;
import javax.management.MBeanServer;
import javax.management.ObjectName;

public class Main {
    /* For simplicity, we declare "throws Exception".
       Real programs will usually want finer-grained exception handling. */
    public static void main(String[] args) throws Exception {
        // Get the Platform MBean Server
        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();

        // Construct the ObjectName for the Hello MBean we will register
        ObjectName mbeanName = new ObjectName("com.example:type=Hello");

        // Create the Hello World MBean
        Hello mbean = new Hello();

        // Register the Hello World MBean
        mbs.registerMBean(mbean, mbeanName);

        // Construct the ObjectName for the QueueSampler MXBean we will register
        ObjectName mxbeanName = new ObjectName(
                "com.example:type=QueueSampler");

        // Create the Queue Sampler MXBean
        Queue<String> queue = new ArrayBlockingQueue<String>(10);
        queue.add("Request-1");
        queue.add("Request-2");
        queue.add("Request-3");
        QueueSampler mxbean = new QueueSampler(queue);

        // Register the Queue Sampler MXBean
        mbs.registerMBean(mxbean, mxbeanName);

        // Wait forever
        System.out.println("Waiting for incoming requests...");
        Thread.sleep(Long.MAX_VALUE);
    }
}
/*
 * QueueSample.java - Java type representing a snapshot of a given queue.
 * It bundles together the instant time the snapshot was taken, the queue
 * size and the queue head.
 */


 class QueueSample {

    private final Date date;
    private final int size;
    private final String head;

    @ConstructorProperties({ "date", "size", "head" })
    public QueueSample(Date date, int size, String head) {
        this.date = date;
        this.size = size;
        this.head = head;
    }

    public Date getDate() {
        return date;
    }

    public int getSize() {
        return size;
    }

    public String getHead() {
        return head;
    }
}


/*
 * QueueSampler.java - MXBean implementation for the QueueSampler MXBean.
 * This class must implement all the Java methods declared in the
 * QueueSamplerMXBean interface, with the appropriate behavior for each one.
 */


 class QueueSampler implements QueueSamplerMXBean {

    private Queue<String> queue;

    public QueueSampler(Queue<String> queue) {
        this.queue = queue;
    }

    public QueueSample getQueueSample() {
        synchronized (queue) {
            return new QueueSample(new Date(), queue.size(), queue.peek());
        }
    }

    public void clearQueue() {
        synchronized (queue) {
            queue.clear();
        }
    }
}
interface QueueSamplerMXBean {
    public QueueSample getQueueSample();

    public void clearQueue();
}

/*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
MBeanServer creation - Java Java Virtual Machine

Description

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