Sunday, June 28, 2009

tibRV java app receiving msg -- the flow

The flow:
* my app creates "my private queue", calling the no-arg constructor TibrvQueue(void)
* my app (or the system) creates a callback-method object, which must implement onMsg(TibrvListener,TibrvMsg). This is not a bean and definitely not a domain entity.
* my app creates myListner, calling its constructor with
** a callback-method object
** myPrivateQueue
** a subject
** other arguments

* my app calls queue.dispatch(void) or poll(void). Unlike JMS, NO message is returned, not on this thread!
* Messages arrive and onMsg(..) runs in the dispatch thread, asynchronously, with
** first arg = myListner
** 2nd arg = the actual message

------------------------
Component - Description

Event Object - Represents program interest in a set of events, and the occurrence of a matching event. See Events on page 81.

Event Driver - The event driver recognizes the occurrence of events, and places them in the appropriate event queues for dispatch. Rendezvous software starts the event driver as part of its process initialization sequence (the open call). See Event Driver on page 83. No java api i believe.

Event Queue - A program (""my app"") creates event queues to hold event objects in order until the program (""my app"") can process them.

Event Dispatch Call - A Rendezvous function call that removes an event from an event queue or queue group, and runs the appropriate callback function to process the event. I think my app calls this in my app's thread.

Callback Function - A program (""my app"") defines callback functions to process events asynchronously. See Callback Functions on page 89.

Dispatcher Thread - Programs (""my app"") usually dedicate one or more threads to the task of dispatching events. Callback functions run in these threads. class com.tibco.tibrv.TibrvDispatcher extends java.lang.Thread. Event Dispatcher Thread is a common design pattern in java, c#...

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