Re: Java class return data to calling CL program

Hi David,

First,

message queue's are not what I would think of when someone mentions
transferring bulk data between processes.

I agree. I also wouldn't think of data queues, web services,
communications, or many other forms of IPC for bulk data, although maybe our
defintions differ. .

I'm curious as to why you used message queue's instead of data queue's?

We had some things that were critical to our client's revenue stream,
and reliablity and low maintenance with as little interruption as possible
were major considerations. After looking at the force to disk and memory
reclamation options, our conclusion was that message queues wouldn't be much
slower than data queues and offered some attractive features like message
wrap and a standard user interface. That meant we could track operations
and even manually send messages for graceful shutdown or program behavior
changes.

A supervisor program retrieves/sends messages and invokes the
appropriate class to handle the operations requested by the message.

One could do the same with data queues, but it would take more
programming. We've been happy with our choice and no client complaints.


Joe Sam

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----- Original Message ----- From: "David Gibbs" <david@xxxxxxxxxxxx>
To: "Java Programming on and around the IBM i" <java400-l@xxxxxxxxxxxx>
Sent: Wednesday, January 19, 2011 2:15 PM
Subject: Re: Java class return data to calling CL program

Joe Sam Shirah wrote:

No theory to it. I've used message queues since 2000.

I'm curious as to why you used message queue's instead of data queue's?

What advantage do they have over data queue's?

I said "In theory" only because it's message queue's are not what I would
think of when someone mentions transferring bulk data between processes.

david

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