Hi Paul,
The data queue monitor uses the QMHRDQM API to read the messages of a given data queue. Since the QMHRDQM API does not remove messages from the queue, reposting of messages is not required.
Honestly I already thought about posting and deleting messages. Here are my concerns about that:
a) I think that we can safely assume that people usually use data structures to build the message data. So what shall we do when the message data is composed of binary or packed values?
b) Removing messages from a data queue is not easy. As you already pointed out, iSphere had to receive and repost the messages, ignoring the messages to be removed. Can you think of a save way to do that? Actually the plug-in cannot do that, because of network problem that may happen all the time. Most likely iSphere had to use commands to dump the queue to a physical file and to repost the messages from the file. Both commands had to be called from a CL program on the IBM i server. Just reading and reposting the messages one by one is not save enough because of possible network problems. Another option could be to create an empty "staging" queue (save/restore and QCLRDTAQ, problem: produce temporary name), then populate that queue with the remaining messages and eventually rename that queue to the original name. Another problem is that the messages that are removed could only be identified by their index number, when the whole thing runs on the IBM I server. Last but not least there had to be an exclusive lock on the queue from the point when the user selects the messages to the end of the job.
Everybody: What are your ideas for solving the problem?
Regards,
Thomas.
-----Ursprüngliche Nachricht-----
Von: WDSCI-L [mailto:wdsci-l-bounces@xxxxxxxxxxxx] Im Auftrag von Paul Bailey
Gesendet: Dienstag, 20. September 2016 12:32
An: Rational Developer for IBM i / Websphere Development Studio Client for System i & iSeries
Betreff: [WDSCI-L] iSphere data queue monitor
Hi Thomas/Frank,
I've been playing with the data queue monitor recently and I like it. I have a question, and a possible enhancement request.
Is the monitor displaying the data in the data queue passively, or is it reading and reposting the data queue items?
Can we have a feature to enable posting and deleting items from a data queue? The posting part should be fine, using the QSNDDTAQ api, but removing an item might require removing all and reposting the ones still required.
What do you think?
-Paul.
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