Set an Exception Listener

All the APIs support the ability to set an exception listener on the connection that gets invoked when a connection breaks or experiences a fault-tolerant failover.

When the event is a disconnect, the exception handler can call various EMS methods without any problem. However, when the event is a fault-tolerant failover, the exception handler is not allowed to call any EMS method. To do so risks a deadlock. You can call the setExceptionOnFTSwitch method to receive an exception that contains the new server URL after a fault-tolerant failover has occurred.

The following examples demonstrate how to establish an exception listener for a connection.

  • Java

    Implement an ExceptionListener.onException method, use the Connection object’s setExceptionListener method to register the exception listener, and call Tibjms.setExceptionOnFTSwitch to call the exception handler after a fault-tolerant failover: 

      public class tibjmsMsgConsumer
          implements ExceptionListener
  {
.....
  public void onException(JMSException e)
       {
         /* Handle exception */
       }
.....
  connection.setExceptionListener(this);
  com.tibco.tibjms.Tibjms.setExceptionOnFTSwitch(true);
.....
  }

    See the tibjmsMsgConsumer.java sample client for a working example (without the setExceptionOnFTSwitch call).

  • C

    Define an onException function to handle exceptions, use the tibemsConnection_SetExceptionListener function to call onException when an error is encountered, and call tibems_setExceptionOnFTSwitch to call the exception handler after a fault-tolerant failover: 

      void onException(
    tibemsConnection    conn,
    tibems_status       reason,
    void*               closure)
  {
     /* Handle exception */
  }
.....
  status = tibemsConnection_SetExceptionListener(
                                            connection,
                                            onException, 
                                            NULL);
  tibems_setExceptionOnFTSwitch(TIBEMS_TRUE);

    See the tibemsMsgConsumer.c sample client for a working example (without the setExceptionOnFTSwitch call).

  • C#

    Implement an IExceptionListener.OnException method, set the Connection object’s ExceptionListener property to register the exception listener, and call Tibems.SetExceptionOnFTSwitch to call the exception handler after a fault-tolerant failover: 

      public class csMsgConsumer : IExceptionListener
  {
.....
  public void OnException(EMSException e) 
      {
     /* Handle exception */
      }
.....
  connection.ExceptionListener = this;
  TIBCO.EMS.Tibems.SetExceptionOnFTSwitch(true);
.....
  }

    See the csMsgConsumer.cs sample client for a working example (without the setExceptionOnFTSwitch call).