16 Creating EDR Listeners

Example 16-1 Using a Pure JMS Listener

public class ClientJMSListener implements MessageListener {
  public void onMessage(Message msg) {
    // Extract the EdrData object or array
    if(o instanceof EdrData[]) {
      for(EdrData edr : (EdrData[])o) {
        //do something with each EDR
      }
    } 
  }
}

Example 16-2 Using a Subclass of JMSListener with No Filter Specified

public class SampleEdrJMSListener extends JMSListener {
  public SampleEdrJMSListener(String url) throws Exception {
    // Register in the JMS topic. No filter is specified so 
    // the "tag" filtering mechanism will be used.
    register(url);
  }
  @Override
  public void onEdr(EdrData edr, ConfigDescriptor descriptor) {
    // The "tag" mechanism will filter the stream of EDRs according
    // to the internal filtering. To know which type of EDR is 
    // actually provided in this method, we have to determine the 
    // instance of the ConfigDescriptor as follow:
    if(descriptor instanceof EdrConfigDescriptor) {
      // do something with this EDR
    } else if(descriptor instanceof AlarmConfigDescriptor) {
      // do something with this alarm
    } else if(descriptor instanceof CdrConfigDescriptor) {
      // do something with this CDR
    }
  }
}

Example 16-3 Using a Subclass of JMSListener with a Specified Filter

public class SampleEdrJMSListener extends JMSListener {

  public SampleEdrJMSListener(String url) throws Exception {
    // Register in the JMS topic. Use the default alarm filter. 
    // Note that in this case all classes needed by the alarm.xml file 
    // must be in the current class loader in order for the filtering 
    // to work correctly.
    register(url, EdrFilterFactory.createDefaultFilterForAlarm());
  }
  @Override
  public void onEdr(EdrData edr, ConfigDescriptor descriptor) {
    // Only AlarmConfigDescriptor should be received here. 
    // Just check before casting.
    if(descriptor instanceof AlarmConfigDescriptor) {
      ... do something with this alarm
    }
  }
}