Re: Java class return data to calling CL program

Can't cite specific articles. Just read that doing a RCVF message and
waiting for a message to arrives was very expensive. Data queues are very
efficient Probably that messages are being polled rather than event driven.
Wish I could cite a specific source.

On Wed, Jan 19, 2011 at 11:00 AM, Charles Wilt <charles.wilt@xxxxxxxxx>wrote:

Alan,

I'd be curious as to where you've read that....

I'm pretty sure both use the MI Queue object.

Perhaps you're thinking of "monitoring exceptions" as is using the
MONMSG, or the MONITOR op-code to handle exceptions?

Exception handling is expensive, so for example when converting dates,
if you expect a higher percentage of invalid dates, it's better to
check first before doing the conversion that way you avoid the expense
of throwing an exception.

Charles

On Wed, Jan 19, 2011 at 11:48 AM, Alan Campin <alan0307d@xxxxxxxxx> wrote:

I always read that the worse thing you can do to the system is to monitor

on

a message queue. It is very expensive but that might have changed with

new

processors. Data queues very efficient.

On Tue, Jan 18, 2011 at 8:01 PM, Joe Sam Shirah <joe_sam@xxxxxxxxxxxxx
wrote:

Hi David,

Yeah, theoretically ...

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

There's a better argument now to use data queues because there's less
maintenance involved than there used to be. However, if you check the

list

where this question has appeared many times, I've always suggested

message

queues, but never pooh-poohed data queues, chiefly because I never saw a
reason to down anyone else's ideas. Message queues are Just Another

Method

of IPC.


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: Tuesday, January 18, 2011 7:21 PM
Subject: Re: Java class return data to calling CL program

On 1/18/2011 4:47 PM, Joe Sam Shirah wrote:

Native message queues are another possibility.

Yeah, theoretically ... but data queues are specifically intended to

pass

data around. Message queues aren't.

david


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