More agent services: monitors and timers - JMX in Action - page 301

Listing 12.3 CorrectiveStringMonitorMBean.java

package jmxbook.ch12;

import javax.management.*;
import javax.management.monitor.*;

public class CorrectiveStringMonitor extends StringMonitor
implements CorrectiveStringMonitorMBean
{

private ObjectName executeName = null;
private String executeMethod = null;

public CorrectiveStringMonitor()
{
super();
}

public void setExecutableMethodOnDiffer(
ObjectName name, String methodName )
{
this.executeName = name;
this.executeMethod = methodName;

}

public void sendNotification( Notification not )
{
if( not.getType().equals(
MonitorNotification.STRING_TO_COMPARE_VALUE_DIFFERED ) )
{
try
{
server.invoke( executeName, executeMethod, null, null );
}
catch( Exception e )
{
e.printStackTrace();
}
}

B

Override
sendNotification()
to take
corrective step

super.sendNotification( not );
}

}

B

The CorrectiveStringMonitor class overrides its parent's sendNotification()
method in order to watch for the String -differ notification. For this demonstra-
tion, this notification tells the MBean to take its corrective measure. When an
instance of the class notices a notification being sent of the differ type, it invokes