On Sun, 21 Oct 2001, David Jencks wrote: > This is very interesting. As I understand your proposal, it has or can > have a centralized facility that knows and sets a stack of tasks that need > to be done on each message, and puts all the messages in whatever state of > progress throught their task stack into the same queue. Did I get it?
pretty much. > Alternatively, your message could have no knowledge about what needed to > happen to it, each task could put its output into a unique queue (or one of > several depending on the final state, e.g. ok vs error), and all the > routing could be done by selecting which queue an mdb listens on. it really gets down to messaging vs typical rmi calls doesn't it? As you mention below, javaspaces is very much what I'm talking about, isn't it. I suppose what I was thinking was that when a task was finished, if it needed something else done, it would specify the next task to be done. when the dispatcher got a message with no more tasks, it would send it to the final destination. output would be put as attributes in the message > Maybe my interpretation that your idea involves putting all the messages > through the same queue several times is wrong or not essential? I do see all messages going to the same address, mainly so that the mdb can act as in a similar capacity to a dispatcher servlet. > It seems to me as if this could lead to fast steps waiting for slow > steps, since the messages have to be delivered in order. I'm not sure if I quite get what you mean here. The tasks in each message would need to be done in order, but thats only a dependency thing, I haven't really considered the situation where we have four tasks, A, B, C and D - with B and C requiring A's output, and D requiring B and C's output - is that what you're talking about? > I'm not sure what other people think, but it has always seemed to me that > javaspaces provide a more elegant way of doing this kind of stuff. > However, I haven't had time yet to write a javaspace connector or find a > fast persistent free javaspace implementation. yes (o: I haven't used Javaspaces myself, but have done a _little_ bit of reading about it... might be time to do some more reading and doing. thanks for the feedback. cheers dim _______________________________________________ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
