Java Reference
In-Depth Information
Listing 3.2
startHTMLAdapter() method that adds the HTML adapter to the agent
protected void startHTMLAdapter()
{
HtmlAdaptorServer adapter = new HtmlAdaptorServer();
ObjectName adapterName = null;
try
{
adapter.setPort( 9092 );
//create the HTML adapter
adapterName = new ObjectName(
"JMXBookAgent:name=html,port=9092" );
server.registerMBean( adapter, adapterName );
adapter.start();
}
catch(Exception e)
{
ExceptionUtil.printException( e );
System.out.println("Error Starting HTML Adapter for Agent");
}
}
Remember from the previous chapter that the HTML adapter is an MBean and
therefore must be registered with the agent like any other MBean. It needs an
ObjectName instance, which you provide with the domain of the agent and a few
descriptive properties. Once it is registered on the MBean server, you call its
start() method to initialize it. If any errors occur, you print them out to the
agent output.
Notice in the catch block that the method uses a class called ExceptionUtil ;
it's a utility class that you'll write at the end of this chapter. It contains a single
static method, printException() , which prints MBeanException s and the excep-
tions wrapped within.
Adding the RMI connector
You have seen the HTML adapter created and registered twice in this topic, but
you have yet to see any code for the RMI connector. (Remember, we aren't cover-
ing the connector extensively in this chapter—we're only showing how to use it
during a simple test. Later chapters use the connector to add and manipulate
MBeans in the agent. For a detailed discussion of the connector, you can jump
ahead to chapter 9.)
Listing 3.3 shows the startRMIConnector() method that is invoked by the agent
constructor. Its purpose is to create and start the RMI connector for this agent.
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