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From Claus Ibsen <claus.ib...@gmail.com>
Subject Re: Dead letter handling in an embedded Camel client.
Date Wed, 15 Jan 2014 09:06:34 GMT
On Tue, Jan 14, 2014 at 4:59 PM, Paul Gale <paul.n.gale@gmail.com> wrote:
> Hi,
>
> What is the recommended way to handle the following scenario.
>
> I intend to embed Camel in a client (a standalone Java process). The
> client receives messages from a queue on an ActiveMQ 5.8.0 broker. The
> client's processor is expected to save each message to a database
> (amongst other things).
>
> I need for my client's behavior to satisfy the following criteria:
>
> 1. If the database goes offline the client's error handling logic
> should retry the database save indefinitely.
> 2. The client should not send an ACK to the broker for a given message
> until it is saved in the database.
> 3. The client should not process subsequent messages until the
> processing of the current one is successful.
> 4. The implementation of the client's retry logic should not require
> the involvement of the broker from which the message came.
>
> Questions:
>
> 1. What is the correct pattern for implementing dead letter handling
> in the client (for handling database retries) so that all of the above
> criteria can be satisfied?
>

Sounds like you only want the client to do dead letter handling / retry etc.

> 2. What gotchas should I be aware of, if any?
>

If I knew all the gotaches in the world I would be rich

> 3. It is my understanding that Camel's dead letter handling is
> separate and distinct from that of ActiveMQ's even when the Camel
> context is running inside a broker. Is that correct? (Seems obvious
> but I thought I'd check.)
>

Yes


> 4. Is the approach I am proposing to take flawed to the extent that
> some other approach must be taken?
>
> Thanks,
> Paul



-- 
Claus Ibsen
-----------------
Red Hat, Inc.
Email: cibsen@redhat.com
Twitter: davsclaus
Blog: http://davsclaus.com
Author of Camel in Action: http://www.manning.com/ibsen
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