[
https://issues.apache.org/activemq/browse/CAMEL-1366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=49958#action_49958
]
Michael Chen commented on CAMEL-1366:
-------------------------------------
As I stated above, I want to end the current process chain without sending back
a reply. When the long running services is completed, the reply will be sent
then and only then. This free up the original processing thread immediately.
The original caller still gets the response it expect.
I now realize that the RouteBuilder methods like inOnly(), outOnly(), etc. are
useless. They only effects downstream processors in the route. It does NOT
change the MEP of the endpoint and its behavior. I will submit a separate bug
on this.
> EndpointMessageListener should respect ExchangePattern
> ------------------------------------------------------
>
> Key: CAMEL-1366
> URL: https://issues.apache.org/activemq/browse/CAMEL-1366
> Project: Apache Camel
> Issue Type: Bug
> Components: camel-jms
> Affects Versions: 1.6.0
> Environment: ActiveMQ/Camel
> Reporter: Michael Chen
>
> In all current releases,
> org.apache.camel.component.jms.EndpointMessageListener.onMessage() has the
> following logic (line 90 in 1.6.0 code):
> {code}
> // send the reply
> if (rce == null && body != null && !disableReplyTo) {
> sendReply(replyDestination, message, exchange, body);
> }
> {code}
> This logic should also respect ExchangePattern of the exchange, so I propose
> a change to:
> {code}
> // send the reply
> if (rce == null && body != null && exchange.isOutCapable()) {
> sendReply(replyDestination, message, exchange, body);
> }
> {code}
> This change allows a processing pattern where the route may change the
> ExchangePattern using methods like RouteBuilder.inOnly() to switch the MEP at
> will so that the reply is send at a later time (true asynchronous exchange).
> This processing pattern is particularly useful for integrating long running
> services. For example,
> {code}
> // Java DSL
> from("activemq:my_queue?exchangePattern=InOnly").to("predict_weather://?reply_later=true");
> // or
> from("activemq:my_queue2").inOnly().to("predict_weather://?reply_later=true");
> {code}
> The flaw of the current logic makes it impossible to do true asynchronous
> exchange, because 1) it does not respect the ExchangePattern; 2) if property
> "disableReplyTo" is used, the "org.apache.camel.jms.replyDestination"
> property will not be set (see method createExchange in the same file), thus
> downstream cannot find the reply destination.
> The proposed change can also deprecate the disableReplyTo property and put
> the MEP concept into good use.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
