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| Why do we need to call MQCLOSE/MQDISC |
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| vandemon |
 Posted: Mon Jun 14, 2010 8:59 pm Post subject: Why do we need to call MQCLOSE/MQDISC |
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Apprentice
Joined: 14 Jun 2010
Posts: 32
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| I'm new to Websphere MQ, and I am conducting a testing on WMQ using VB6. I found out that WMQ will automatically close the open input and open output after 5 second when my application closed. My application did not call any MQCLOSE or MQDISC upon form closing. So why do we need to call MQCLOSE/MQDISC eventhough the WMQ will close it for us? |
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| zpat |
| Posted: Mon Jun 14, 2010 11:23 pm Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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Where are you looking to determine it has closed the handles?
It's good practice to do this explicitly. It can also affect the way any open syncpoint is handled. |
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| vandemon |
| Posted: Mon Jun 14, 2010 11:53 pm Post subject: |
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Apprentice
Joined: 14 Jun 2010
Posts: 32
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| bruce2359 |
| Posted: Tue Jun 15, 2010 5:21 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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| Quote: |
| It's good practice to do this explicitly. |
It's a best practice in all programming languages to explicitly close what you open (files, for example). Most programming language reference manuals will tell you that the results of not closing what you open are unpredictable.
Unpredictable means that your results may vary by platform, version/release/modification level of MQ, the language translator, the o/s, and many other variables.
This same thought process applies to initializing variables, testing (validating) the presence of numbers before doing aritimetic, and so on. Hence, the best practice.
_________________
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ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| mqjeff |
| Posted: Tue Jun 15, 2010 9:38 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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Every time you write an open statement in code, write the close statement.
Then put more code in between. |
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