Sync & Async subscribers on the same channel ?

[sudheerk84]

I have a requirement where i need some of the subscribers (say A and B) to be synchronously called where as the other subscribers (say C and D )need to be asynchronous.

So what i am trying to say is does the subscriber have any way of saying if its sync or async ? or its always the property of channel(through task executors)

Is this possible in a single channel ?

With multiple channels i have a solution. I make independent syn and async channels and let the subscriber s connect to teh respective channels.

[oleg.zhurakousky]

Distributing messages synchronously or asynchronously is currently the responsibility of the MessageDispatcher which defines task-executor.
However, what you are proposing is essentially to move the task-executor to the subscribers, which is interesting and requires more thought.
Please open a JIRA feature request and we'll take a look at it
Cheers

[sudheerk84]

Thanks Oleg

I have created a ticket for the same

http://jira.springframework.org/browse/INT-784

[iwein]

There are two ways you can do this with current functionality. First you can use a separate channel for C and D and use a bridge.

<channel id="input">
<service-activator id="A" input-channel="input" .../>
<service-activator id="B" input-channel="input" .../>
<bridge input-channel="input" output-channel="async"/>
<channel id="async" task-executor="pool" />
<.. "C" />
<.. "D" />

You can also look beyond Spring Integration and use @Async (supported in Spring 3.0) for example to do asynchronous handoff in the services themselves.