printereventbroadcaster.java

java2高级教程大学教程的配套光盘源码

// Fig. 24.10: PrinterEventBroadcaster.java
// This class defines an MBean that 
// provides events information.

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

// JMX core packages
import javax.management.MBeanNotificationInfo;
import javax.management.NotificationBroadcasterSupport;

// extends NotificationBroadcasterSupport to adopt its 
// functionality.
public class PrinterEventBroadcaster 
   extends NotificationBroadcasterSupport
   implements PrinterEventBroadcasterMBean {

   private static final String OUT_OF_PAPER = 
      "PrinterEvent.OUT_OF_PAPER";
   private static final String LOW_TONER = 
      "PrinterEvent.LOW_TONER";
   private static final String PAPER_JAM = 
      "PrinterEvent.PAPER_JAM";

   // provide information about deliverable events
   public MBeanNotificationInfo[] getNotificationInfo() 
   {
      // array containing descriptor objects
      MBeanNotificationInfo[] descriptorArray = 
         new MBeanNotificationInfo[ 1 ];
                
      // different event types
      String[] notificationTypes = new String[ 3 ];
      notificationTypes[ 0 ] = 
         PrinterEventBroadcaster.OUT_OF_PAPER;
      notificationTypes[ 1 ] = 
         PrinterEventBroadcaster.LOW_TONER;
      notificationTypes[ 2 ] =
         PrinterEventBroadcaster.PAPER_JAM;
      
      // notification class type
      String classType = "javax.management.Notification";
      
      // description of MBeanNotificationInfo
      String description =
         "Notification types for PrinterEventBroadcaster";
      
      // populate descriptor array
      descriptorArray[ 0 ] = new MBeanNotificationInfo( 
         notificationTypes, classType, description );
          
      return descriptorArray;   

   } // end method getNotificationInfo
}

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