Acknowledge Alarm

[LamLuong]

Dear author,
I am having a trouble with acknowledging an Alarm in UAExpert. When I try to acknowledge it, it prompts me to enter a message, however after entering a message, nothing happened, I expected the Alarm to switch “acknowledged” mode.

I saw that you have following function
@OverRide
   public void call(CallContext context, List requests) {
       List results = Lists.newArrayListWithCapacity(requests.size());
       System.out.println(requests.size());
       results.add(
           new CallMethodResult(
                           new StatusCode(StatusCodes.Good_CallAgain),
                           new StatusCode[0],
                           new DiagnosticInfo[0],
                           new Variant[0]
                       ));

       context.success(results);
   }

I overrode this method because the acknowledge action calls this function, but I am not sure how to create a proper response. Could you please help me with an example that would allow the alarm status to be updated to "acknowledged"?
Thanks

[kevinherron]

This is a tricky question that depends on how you've implemented alarms and events.

In your AddressSpace implementation you'd probably want to override getInvocationHandler:

  @Override
  protected MethodInvocationHandler getInvocationHandler(NodeId objectId, NodeId methodId) throws UaException {
    if (methodId.equals(NodeIds.AcknowledgeableConditionType_Acknowledge)) {
      // TODO if objectId == conditionId of some AcknowledgeableConditionType instance, do some acknowledge logic?
    } else {
      return super.getInvocationHandler(objectId, methodId);
    }
  }

The acknowledge method is called using the condition id as the object id. Presumably you have some kind of bookkeeping that knows what alarm/condition instances are currently active and what their state is.