OK. I was thinking about that but it was difficult to find some way to
create "private queue". Are there any examples?
Miro.
On Fri, May 23, 2008 at 12:57 AM, <glassfish_at_javadesktop.org> wrote:
> Miroslav,
>
> Read this carefully.
>
> Callbacks are a dead end. IT CAN NOT BE DONE. There are several reasons
> that make it utterly impractical.
>
> The most "straightforward" solution is simply JMS.
>
> One of the features of JMS is a "private queue". Essentially, an attribute
> of the message being sent is a queue that the reciever can use to send back
> a result to the caller. This technique is a way to make what is nominally an
> asynchronous call, effectively a synchronous one.
>
> When your client makes the initial request, it can set up a private
> response queue that it can listen to. The server (a Message Driven Bean)
> will listen to the "main queue", process what it wants to, and each time it
> may need to "call back", it can set up its own private queue, send a message
> to the client using the private queue the client originally sent, then
> listen for a response on its own private queue. The client gathers its
> information, and replies on the servers private queue. It can do that as
> often as it likes.
>
> When it's all done, the private queues are destroyed and processing moves
> on.
>
> It's a little cumbersome, but it works, and its portable, and should suit
> your need quite well.
>
> The interchange all happens in the JMS server, the server never talks
> directly to the client.
>
> Also, you'll need to ensure that you have enough instances of your Message
> Bean, since it sounds like it can block while waiting for the users (which
> means you'll need enough MDBs to service however many simultaneous blocked
> users you may have).
> [Message sent by forum member 'whartung' (whartung)]
>
> http://forums.java.net/jive/thread.jspa?messageID=276149
>
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