printereventhandler.java

高级java2 大学教程(含源码,经典的Java学习教程

// Fig. 24.11: PrinterEventHandler.java
// The class adds a listener to the broadcaster MBean and
// defines the event handlers when event occurs.

// deitel package
package com.deitel.advjhtp1.jmx.Client;

// JMX core packages
import javax.management.*;

// JDMK core packages
import com.sun.jdmk.comm.RmiConnectorClient;
import com.sun.jdmk.comm.ClientNotificationHandler;

// Deitel packages
import com.deitel.advjhtp1.jmx.Printer.*;

public class PrinterEventHandler {

   private RmiConnectorClient rmiClient;
   private PrinterEventListener eventTarget;

   // notification listener annonymous inner class
   private NotificationListener notificationListener =   
      new NotificationListener() {
         public void handleNotification(
            Notification notification, Object handback ) 
         {
            // retrieve notification type
            String notificationType = notification.getType();

            // handle different notifications  
            if ( notificationType.equals( 
               "PrinterEvent.OUT_OF_PAPER" ) ) { 
                  handleOutOfPaperEvent(); 
                  return;
            }
            
            if ( notificationType.equals( 
               "PrinterEvent.LOW_TONER" ) ) { 
                  handleLowTonerEvent(); 
                  return; 
            }

            if ( notificationType.equals( 
               "PrinterEvent.PAPER_JAM" ) ) {
                  handlePaperJamEvent();
                  return;   
            }

         } // end method handleNotification

      }; // end annonymous inner class

   // default constructor
   public PrinterEventHandler(
      RmiConnectorClient inputRmiClient,
      PrinterEventListener inputEventTarget ) 
   {
      rmiClient = inputRmiClient;
      eventTarget = inputEventTarget;
      
      // set notification push mode
        rmiClient.setMode( ClientNotificationHandler.PUSH_MODE );      
      
      // register listener
      try {
         ObjectName objectName = new ObjectName( 
            rmiClient.getDefaultDomain() 
            + ":type=" + "PrinterEventBroadcaster" );

         rmiClient.addNotificationListener( objectName,
            notificationListener, null, null );
      } 

      // if MBean does not exist in the MBean server
      catch ( InstanceNotFoundException exception) {
         exception.printStackTrace();
      }

      // if the format of the object name is wrong
      catch ( MalformedObjectNameException exception ) {
         exception.printStackTrace();
      }

   } // end PrinterEventHandler constructor
   
   // delegate out of paper event
   private void handleOutOfPaperEvent()
   {
      eventTarget.outOfPaper();
   }
   
   // delegate low toner event
   private void handleLowTonerEvent()
   {
      eventTarget.lowToner();
   }
   
   // delegate paper jam event
   private void handlePaperJamEvent()
   {
      eventTarget.paperJam();
   }
}

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