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| Finding out default queue manager name |
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| leot |
 Posted: Mon Apr 22, 2002 2:32 pm Post subject: |
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Novice
Joined: 21 Apr 2002
Posts: 24
Location: NYC
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I am using MQSeries Java API (non-JMS).
If I set queue manager name to "" or null when connecting, I get a connection to whatever is set as default manager.
Once I connected: is there a way to find what manager I am connected to?
Thanks,
Leo |
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| StefanSievert |
| Posted: Mon Apr 22, 2002 2:58 pm Post subject: |
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Partisan
Joined: 28 Oct 2001
Posts: 333
Location: San Francisco
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Yes, you can MQOPEN the queue manager object MQOT_QMGR with the MQOO_INQUIRE options set and inquire the name attribute. The application programming guide (or the programmable systems management guide) should contain the details.
Hope that helps,
Stefan
_________________
Stefan Sievert
IBM Certified * WebSphere MQ |
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| leot |
| Posted: Mon Apr 22, 2002 3:57 pm Post subject: |
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Novice
Joined: 21 Apr 2002
Posts: 24
Location: NYC
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I looked up MQOO_INQUIRE, and it appears that this is a value for the queue opening options, not the manager. In fact, I cannot see any options for connecting to a queue manager, other than an int that specifies whether I want fast or not. And what API calls do I use to inquire about queue manager name? I cannot find any methods in MQQueueManager that return its name either.
Thanks,
Leo |
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| leot |
| Posted: Mon Apr 22, 2002 3:58 pm Post subject: |
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Novice
Joined: 21 Apr 2002
Posts: 24
Location: NYC
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I meant "fast bindings", not just "fast".
Sorry.
Leo |
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| StefanSievert |
| Posted: Tue Apr 23, 2002 10:24 am Post subject: |
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Partisan
Joined: 28 Oct 2001
Posts: 333
Location: San Francisco
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| Quote: |
On 2002-04-22 16:57, leot wrote:
I looked up MQOO_INQUIRE, and it appears that this is a value for the queue opening options, not the manager. In fact, I cannot see any options for connecting to a queue manager, other than an int that specifies whether I want fast or not. And what API calls do I use to inquire about queue manager name? I cannot find any methods in MQQueueManager that return its name either.
Thanks,
Leo
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Leo,
this is a quote from the MQOPEN call description in the Application Programming reference:
<quote>
MQOO_INQUIRE
Open object to inquire attributes.
The queue, namelist, process definition, or queue manager is opened for use with subsequent MQINQ calls.
This option is valid for all types of object other than distribution lists.
</quote>
So, you need to specify MQOT_Q_MGR as the objectType in the object descriptor on the MQOPEN and then call MQINQ to inquire for the attribute 'QMgrName'. Please see the description for the MQINQ call in the APR manual for details.
If you are familiar with C, here's an extract of the IBM provided sample program amqscnxc.c which does exactly what you are looking for:
| Quote: |
/******************************************************************/
/* */
/* Open the queue manager object to find out its name */
/* */
/******************************************************************/
od.ObjectType = MQOT_Q_MGR; /* open the queue manager object*/
MQOPEN(Hcon, /* connection handle */
&od, /* object descriptor for queue */
MQOO_INQUIRE + /* open it for inquire */
MQOO_FAIL_IF_QUIESCING, /* but not if MQM stopping */
&Hobj, /* object handle */
&OpenCode, /* MQOPEN completion code */
&Reason); /* reason code */
/* report reason, if any */
if (Reason != MQRC_NONE)
{
printf("MQOPEN ended with reason code %ldn", Reason);
}
if (OpenCode == MQCC_FAILED)
{
printf("Unable to open queue manager for inquiren");
}
/******************************************************************/
/* */
/* Inquire the name of the queue manager */
/* */
/******************************************************************/
if (OpenCode != MQCC_FAILED)
{
Selector = MQCA_Q_MGR_NAME;
MQINQ(Hcon, /* connection handle */
Hobj, /* object handle for q manager */
1, /* inquire only one selector */
&Selector, /* the selector to inquire */
0, /* no integer attributes needed */
NULL, /* so no buffer supplied */
MQ_Q_MGR_NAME_LENGTH, /* inquiring a q manager name */
QMName, /* the buffer for the name */
&CompCode, /* MQINQ completion code */
&Reason); /* reason code */
if (Reason == MQRC_NONE)
{
printf("Connection established to queue manager %-48.48sn",
QMName);
}
else
{
/* report reason, if any */
printf("MQINQ ended with reason code %ldn", Reason);
}
}
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The same logic should be available for Java code, though I couldn't find any samples. Maybe somebody else has more info.
Hope that gets you started,
Stefan
_________________
Stefan Sievert
IBM Certified * MQSeries
[ This Message was edited by: StefanSievert on 2002-04-23 11:26 ] |
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| StefanSievert |
| Posted: Tue Apr 23, 2002 10:35 am Post subject: |
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Partisan
Joined: 28 Oct 2001
Posts: 333
Location: San Francisco
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Leo,
I just did a little more reading in the Using Java manual. You should be able to retrieve the name of the queue manager by doing something like this:
MQManagedObject mqmo = (MQManagedObject)yourQueueManagerObject;
and then invoking mqmo.inquire using the arguments required to retrieve the queue manager name. The algorithm seems to be the same.
Stefan
_________________
Stefan Sievert
IBM Certified * WebSphere MQ |
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| leot |
| Posted: Wed Apr 24, 2002 4:12 am Post subject: |
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Novice
Joined: 21 Apr 2002
Posts: 24
Location: NYC
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Stefan,
Thanks for your help!
I was eventually pointed in the same direction as you suggested: using inquire() of the MQManagedObject, of which MQQueueManager is descendant.
Do you know if it is in anybody's plans at IBM to keep making MQSeries Java API more like Java, and less like C? (the inquire() method is a perfect example - a method whose behavior is fully determined by the arguments passed, and returns have to be parsed and interrogated according to some not-so-obvious rules)
Thanks again,
Leo |
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