HelloWorldExample


1   /*
2    * Copyright (C) The MX4J Contributors.
3    * All rights reserved.
4    *
5    * This software is distributed under the terms of the MX4J License version 1.0.
6    * See the terms of the MX4J License in the documentation provided with this software.
7    */
8   
9   package mx4j.examples.mbeans.helloworld;
10  
11  import javax.management.MBeanServer  ;
12  import javax.management.MBeanServerFactory  ;
13  import javax.management.ObjectName  ;
14  
15  /**
16   * JMX HelloWorld example. <p>
17   * Instead of saying "Hello", this simple class shows how is possible to create services,
18   * register them in the JMX Agent, and invoke methods on them <strong>without</strong>
19   * having a reference to them. <br>
20   * One can create a service that can reload its configuration at runtime, and be queried
21   * on how many times the configuration is reloaded, and expose it as standard MBean. <br>
22   * This class shows in code what is possible to do via a management interface: once the
23   * service is registered, one can connect via (for example) the HTTP adaptor and
24   * invoke methods on the MBean. <br>
25   * The service (the MBean) can be registered in one host, while the system administrator
26   * can connect to the HTTP adaptor from another host using a browser and ask the service
27   * to reload its configuration, without stopping it nor being forced to login to the
28   * remote host.
29   *
30   * @version $Revision: 1.1 $
31   */
32  public class HelloWorldExample
33  {
34     public static void main(String  [] args) throws Exception  
35     {
36        // Create an instance of MBeanServer
37        MBeanServer   server = MBeanServerFactory.createMBeanServer();
38  
39        // Create an ObjectName for the MBean
40        ObjectName   name = new ObjectName  (":mbean=helloworld");
41  
42        // Create and register the MBean in the MBeanServer
43        server.createMBean("mx4j.examples.mbeans.helloworld.HelloWorld", name, null);
44  
45        // Invoke a method on it
46        server.invoke(name, "reloadConfiguration", new Object  [0], new String  [0]);
47  
48        // Invoke an attribute on it
49        Integer   times = (Integer  )server.getAttribute(name, "HowManyTimes");
50  
51        System.out.println("The configuration was reloaded " + times + " times.");
52     }
53  }
54
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