Hi,
the communication pattern you are referring to is called Enhanced
Acknowledgement as defined in chapter 2.9.3 of the HL7 spec. Note that this
goes along with setting MSH-15 and MSH-16 of the initiating message
depending on what kind of acks you expect as response.
Anyway, HAPI currently does not support Enhanced Acknowledgement - the
server framework expects exactly one response with MSA-1 referring to the
original message ID, regardless whether this is a communication
acknowledgment or an application response. Enhanced Acknowledgement seems to
be rather rarely used compared to the Original Acknowledgement mode.
If you think that this is a major issue (maybe others need this as well?),
feel free to file a feature request in the HAPI tracker. Of course,
contributions are also always welcome!
cheers
Christian
Paulo Ferreira-6 wrote:
>
> Hi,
>
> Currently, i'm using API libs to synchronize information between the two
> systems. Recently, I had some difficulty in using the aplication handlers
> (from HAPI) to listen for unsolicited messages.
>
> Use case:
> We need to syncronize some information between two clinical information
> systems: from system A to B. For that, system A send OMP_O09 message to
> system B, receiving the corresponding receipt of communication and
> subscribe ORP_O10 message (comming from system B) as a application
> acknowledgement using Application handlers.
>
> Problem:
> - OMP_O09 message is sent successfully from A to B, and SimpleServer
> (listener) is started on A;
> - Comunication acknowledgement (ACK) is returned in response;
> - System B sent Applicational acknowledgement (ORP_O10) to A with some
> information about the success of the operation performed;
> - SimpleServer (listener) receive ORP_O10 but considers it as "Unexpected
> Message Received";
>
> [LOG]
> (HapiLogImpl.java:78) - Accepted connection from 192.168.4.202
> (HapiLogImpl.java:33) - ACK ID: MSG305
> (HapiLogImpl.java:78) - End of input stream reached.
> (HapiLogImpl.java:78) - Closing connection (no more messages available).
> (HapiLogImpl.java:33) - ACK ID: MSG305
> (HapiLogImpl.java:78) - Unexpected Message Received:
> MSH|^~\&|SAM|1030101|PEM|SPMS|20120820173323.644+0100||ORP^O10|be5c9b09-e93b-
>
> 465e-aaeb-d533b6b4b6ce|P|2.5
> MSA|AA|MSG305|Success|||
> [/LOG]
>
>
> After some code analysis we detect that in processMessage (method of
> Receiver class) is invoked conn.findRecipient(ackID) method that verify if
> ackId is in receipts table. As ACK already been processed, ackID has been
> removed from receipts table, this causes a null MessageReceipt. So the
> message is not processed.
>
> [CODE FROM RECEIVER CLASS]
> protected void processMessage(String message) {
> String ackID = conn.getParser().getAckID(message);
> if (ackID == null) {
> Grunt g = new Grunt(conn, message);
> g.start();
> }
> else {
> MessageReceipt mr = conn.findRecipient(ackID);
> if (mr == null) {
> log.info( "Unexpected Message Received: " + message );
> }
> else {
> mr.setMessage(message);
> }
> }
> }
>
> [/CODE FROM RECEIVER CLASS]
>
> It seems that sendAndReceive method from Initiator class is ONLY SUITEABLE
> for send a mensage and receive the corresponding comunication ACK!
>
> I wonder if anyone can help me with this issue. On one hand I wonder if
> this is really a problem that has not yet been spoken. On the other hand,
> if there are other solutions that you seem better suited for this
> situation.
>
>
> Cheers,
>
> Paulo Ferreira.
>
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