Re: This is a software design question - ILE related

M
Hello Nathan,

You wrote:
>If you create a "server" to return data through a queue, you run into one
>challenge - you must ensure the correct data is returned to the correct
>user.  If you use only two queues (request queue + response queue) you must
>somehow synchronize the requesting procedure to only one concurrent job.
>You don't want to run into a case where one job puts a request on a queue
>and a different job retrieves the response.

That's what keyed queues are for.  Use the job number as the key value.  The 
server batch 
job can determine the sender's job number from the sender information 
associated with a 
data queue or the sender can provide

For example;
        INPUTQ non-keyed with sender data

        OUTPUTQ 6-byte key 

or

        INOUTQ with 6-byte key with sender data

In both cases:
                Sender uses key of zero to enqueue
                Receiver uses key of zero to dequeue
                Receiver uses job number from sender data to enqueue
                Sender uses own job number to dequeue

You could also include the job number as part of the data enqueued by the 
sender.

Regards,
Simon Coulter.

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