9.2.3 JMXMP Connector Client

The Client.java class is shown in Example 9–4. The only difference between the client in this example and that used in the RMI connector example is in the JMX service URL. The operations this example performs on the SimpleStandard MBean are identical to those performed in the RMI connector example. Consequently, the code has been abridged.

Example 9–4 JMXMP Connector Client

public class Client { 
 
   public static void main(String[] args) { 
     try { 
        // Create a JMXMP connector client 
        // 
        System.out.println("\nCreate a JMXMP connector client"); 
        JMXServiceURL url = 
            new JMXServiceURL("service:jmx:jmxmp://localhost:5555"); 
        JMXConnector jmxc = JMXConnectorFactory.connect(url, null); 
        MBeanServerConnection mbsc = jmxc.getMBeanServerConnection(); 
 
        // Get domains from MBeanServer, create SimpleStandard MBean 
        // 
        String domains[] = mbsc.getDomains(); 
        for (int i = 0; i < domains.length; i++) { 
            System.out.println("Domain[" + i + "] = " + domains[i]); 
        ObjectName mbeanName = new ObjectName(
             "MBeans:type=SimpleStandard"); 
        mbsc.createMBean("SimpleStandard", mbeanName, null, null); 
 
       // Perform simple MBean operations, add listener, reset MBean, 
       // remove listener, unregister MBean 
 
       [...] 
        
       // Close MBeanServer connection 
       // 
       jmxc.close(); 
     } catch (Exception e) { 
       e.printStackTrace(); 
     } 
   } 
} 

The Client.java class creates a JMXMP connector client that is configured to connect to the JMXMP connector server created by Server.

As you can see, Client defines a service URL url that allows the connector client to find the connector server.

The connector client, jmxc, is an instance of the JMXConnector interface, created by the connect() method of JMXConnectorFactory. The connect() method is passed the parameter url when it is called.

An instance of MBeanServerConnection, named mbsc, is then created by calling the getMBeanServerConnection() method of the JMXConnector instance jmxc.

The connector client is now connected to the MBean server created by Server, and can create MBeans and perform operations on them with the connection remaining completely transparent to both ends.

The client creates and registers the SimpleStandard MBean in the MBean server with a call to the createMBean() method of MBeanServerConnection, and performs the operations defined by SimpleStandard as if they were local MBean operations.

Finally, the client unregisters SimpleStandard and closes the connection.