JMS QueueSender receiving response possible?
hi,
i am trying to write a JMS application. i can send a message from a QueueSender to a QueueReceiver with no problem. but is there a way the sender can get a response from the receiver after it sent something out? this would be similar to sending data via socket, where you can get a response back after you sent something out.
the only way i can think of is to instantiate a QueueReceiver object in the QueueSender class, but this makes things complicated as i would also need to create a separate message queue for each sender. Can someone give me some hints? thanks.
Hi,
Your query is not clear, if you are expecting the acknowledgement from the receiver you can do it by passing one of the values metioned below as second argument to createQueueSession or createTopicSession
Session.AUTO_ACKNOWLEDGE
or
Session.CLIENT_ACKNOWLEDGE
Regards
Mandagiri
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>
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Hi All,
Pl. help me with ur expertise in the foll. scenario we are facing.
Scenario:
I have a requirement where I need to notify the exceptions to my client while
the client request's are processed asynchronously and my client is waiting in
synchronous for the response.
The client is sending a message to one queue (QueueA) and waiting for response
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Tks and regds
C R Baradwaj
Raghuram Bharadwaj C wrote:
> Tom,
>
> Once again thanks a lot for your prompt response!
>
> Yes, A Knows how many downstream queues are involved.
>
> For unanticipated multiple responses
>
> If I do a select for update in all the MDB's listening to "QueueB/QueueC/QueueD",
> only one response message will be sent to the "ResponseQ".
Does this run the risk of serializing the database access? If
B/C/D have no messages so that a new operation causes all
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respective selectForUpdate calls, losing parallelism?
>
> The response from all the datasource(s) are updated in the database by the MDB.
> The MDB which updates the database last will consolidate all the response(s) and
> send one final response to the "ResponseQ".
>
> This will be picked up the client who is waiting in the "ResponseQ". There wont
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>
> In this situation, How do I handle exceptions that occur in downstream MDB's?
Use multiple responses. MDB's send error message on response.
Or have failing MDB put an error message in the database table, so
that the final responder can read the error message?
>
> Many Thanks in Advance,
> C R Baradwaj
>
>
>
>
>
>
>
>
>
>
> Tom Barnes <[email protected]> wrote:
>
>>
>>Raghuram Bharadwaj C wrote:
>>
>>>Thanks tom for your support!
>>>
>>>Let me explain more about the problem.
>>>
>>>Scenario
>>>========
>>>Lets take a simplest case where the client is sending a message to
>>
>>"QueueA" and
>>
>>>he is now waiting for a response in the "ResponseQ"
>>>
>>>The MDB listening to "QueueA" wakes up and split the message(s) into
>>
>>three and
>>
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>>
>>are
>>
>>>"QueueB", "QueueC" and "QueueD".
>>>
>>>The MDB listening to the datasource specific queue(s) picks up the
>>
>>datasource
>>
>>>request sends it to the datasource and gets the response back from
>>
>>the datasource.
>>
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>>
>>MDB also check(s)
>>
>>>after updating the database to see all response(s) from all the datasource(s)
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>>
>>the "ResponseQ".
>>
>>>
>>>The client listening to the "ResponseQ" gets the acknowledgement and
>>
>>hit the database
>>
>>>to collect all the response(s) from all the datasource(s). These response(s)
>>
>>are
>>
>>>formatted and sent a response to the client. We have also created uniqueid
>>
>>for
>>
>>>identifying each request. This uniqueid is set in the JMSCorrelationID.
>>
>>The client
>>
>>>uses the uniqueid to collect all the response(s) for the request he
>>
>>had sent.
>>
>>>Problem
>>>=======
>>>If an error/exception occurred in a one of the MDB which is listening
>>
>>to QueueB/QueueC/QueueD.
>>
>>>How do we handle this?
>>>
>>>Please let me know all the possibilities that you would have done in
>>
>>this case.
>>
>>>
>>Does A know how many downstream queues are involved? As part of its
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>>
>>This way there are no race conditions
>>involving unanticipated multiple responses or missing
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>>algorithm you mention above can create.
>>Assuming just B and C (no D):
>> B detects C is done by checking the DB
>> C detects B is done by checking the DB **at the same time**
>> Two response messages get sent
>> - or -
>> B finishes detects C not done, and sends no message.
>> C finishes, B is finished but not reflected in DB yet, sends
>> no message.
>>
>>NOTE: Be aware that when a transaction commits, different
>>resources can response "faster" than others. The transaction
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>>same commit, a database insert and a queue insert is
>>performed, it is possible for a consumer to receive the
>>new message BEFORE the new database insert actually completes.
>>
>>
>>>
>>>Many Thanks in Advance,
>>>
>>>C R Baradwaj
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>Assuming that
>>>
>>>Tom Barnes <[email protected]> wrote:
>>>
>>>
>>>>One approach is to send an "error" message to QB that uses
>>>>the JMSCorrelationID the consumer is expecting. This will
>>>>wake up the consumer, and the consumer can react to
>>>>the error as needed.
>>>>
>>>>Another is to use two asynchronous listeners, one on the
>>>>response queue, and one on a temporary (client created)
>>>>queue. On error detection the MDB can send error messages
>>>>to the temporary queue.
>>>>
>>>>You may want to skim the book "Professional JMS" - as I
>>>>recall, it contains a section on queueing design patterns.
>>>>
>>>>Tom
>>>>
>>>>Raghuram Bharadwaj C wrote:
>>>>
>>>>
>>>>
>>>>>Hi All,
>>>>>
>>>>>Pl. help me with ur expertise in the foll. scenario we are facing.
>>>>>
>>>>>Scenario:
>>>>>I have a requirement where I need to notify the exceptions to my client
>>>>
>>>>while
>>>>
>>>>
>>>>>the client request's are processed asynchronously and my client is
>>>>
>>>>waiting in
>>>>
>>>>
>>>>>synchronous for the response.
>>>>>
>>>>>The client is sending a message to one queue (QueueA) and waiting
>>
>>for
>>
>>>>response
>>>>
>>>>
>>>>>in another queue (QueueB). The message from "QueueA" is picked up
>>
>>by
>>
>>>>a MDB listening
>>>>
>>>>
>>>>>to "QueueA" and it throws an exception while processing some "business
>>>>
>>>>logic".
>>>>
>>>>
>>>>>In this case how do I notify to my client who is waiting in another
>>>>
>>>>queue. i.e.
>>>>
>>>>
>>>>>"QueueB" that there is an exception occurred while processing the
>>
>>business
>>
>>>>logic.
>>>>
>>>>
>>>>>I am using JMSCorrelationID to uniquely identify a response for a
>>
>>request
>>
>>>>sent
>>>>
>>>>
>>>>>by the client.
>>>>>
>>>>>What are the possible options to handle exceptions in JMS for an implementation
>>>>>like the one mentioned above.
>>>>>
>>>>>Any comments/feedback/pointers will be REALLY REALLY appreciated.
>>>>>
>>>>>Tks and regds
>>>>>C R Baradwaj
>>>>
>
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What is will be Service Number?
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