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| Java PCF - MQIACF_FORCE to clear open queue fails |
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Message
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| petmor |
 Posted: Tue Jul 09, 2013 10:48 am Post subject: Java PCF - MQIACF_FORCE to clear open queue fails |
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Apprentice
Joined: 20 Jun 2002
Posts: 45
Location: Pasadena, CA
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Hi,
I wrote some Java using the PCF API to clear unwanted messages from queues. Here is an excerpt:
for (int i = 0; i < s.length; i++) {
PCFMessage request = new PCFMessage(CMQCFC.MQCMD_CLEAR_Q);
request.addParameter(CMQC.MQCA_Q_NAME, s[i]);
try {
pcfCM.agent.send(request);
} catch (PCFException e) {
.
.
.
}
This works fine except on queues held open by a process. I want to clear those queues also, so I added a line "request.addParameter(CMQCFC.MQIACF_FORCE, CMQCFC.MQFC_YES);" to specify FORCE, but this results in a "3020 (0BCC) (RC3020): MQRCCF_PARM_COUNT_TOO_BIG'". The code with FORCE is pasted below.
for (int i = 0; i < s.length; i++) {
PCFMessage request = new PCFMessage(CMQCFC.MQCMD_CLEAR_Q);
request.addParameter(CMQC.MQCA_Q_NAME, s[i]);
request.addParameter(CMQCFC.MQIACF_FORCE, CMQCFC.MQFC_YES);
try {
pcfCM.agent.send(request);
} catch (PCFException e) {
.
.
.
}
Obviously I am not using the option properly, so what am I doing incorrectly, and what is the proper way to specify FORCE without throwing the RC3020?
Thanks!
Peter |
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| mqjeff |
| Posted: Tue Jul 09, 2013 11:06 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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Well, first of all, there isn't a valid FORCE parameter for the Clear Queue PCF message...
Secondly, you really don't likely want to clear messages out from underneath a running application.
Thirdly, if you do want to clear them, the only reliable way is to GET them. |
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| petmor |
| Posted: Tue Jul 09, 2013 12:42 pm Post subject: |
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Apprentice
Joined: 20 Jun 2002
Posts: 45
Location: Pasadena, CA
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Hi,
Thanks mqjeff for your reply. I only tried Force because the suggested Programmer Response for MQRC4004 recommends "Wait until the object is not in use, and then retry the operation. Alternatively specify Force as MQFC_YES for a change command." I would not have known otherwise without your input.
I agree it is a bad idea to purge messages from open queues. This process runs only on one of our development servers as a clean-up job, where the purged messages will not be missed.
I'll try a GET instead. Thanks again!
Peter |
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| mqjeff |
| Posted: Tue Jul 09, 2013 12:55 pm Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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| petmor wrote: |
| Thanks mqjeff for your reply. I only tried Force because the suggested Programmer Response for MQRC4004 recommends "Wait until the object is not in use, and then retry the operation. Alternatively specify Force as MQFC_YES for a change command." |
That's being technical about the meaning of "change command".
It means a Change PCF message or an Alter MQSC command, neither of which are the Clear command.
MQExplorer gives you a popup to either use Clear or to use MQGET - again because CLEAR doesn't have a FORCE option.
In general, if you're doing anything with PCF messages, keep the docs handy. |
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