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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » Broker 6.1 Shared Row Locks

Broker 6.1 Shared Row Locks

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jonesn

Posted: Thu May 14, 2009 1:52 am Post subject: Broker 6.1 Shared Row Locks

Apprentice

Joined: 09 Jan 2002
Posts: 47

Chaps,

I am working on a flow which reads records from a file and builds up a message containing information from about 900 rows. I use a couple of shared rows: one containing counts/totals and the other containing the message I am building up. This works OK till I try to update an element in one row with values from the other. I get an exception stating that I have attempted to get a write and a read lock. I would be grateful if anyone can explain how locking works when using shared rows.

Thanks
_________________
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Nick Jones
IBM Certified Solutions Expert (WebSphere MQ Integrator)

mgk

Posted: Thu May 14, 2009 2:20 am Post subject:

Padawan

Joined: 31 Jul 2003
Posts: 1642

Posting your code would be helpful, but essentially you have a readLock if the ROW is on the right of an '=' and a writeLock if it is on the left of an '=' You cannot have both at once. Therefore assign the value you are reading to a temp variable then assign the temp value back to the tree.

regards,
_________________
MGK
The postings I make on this site are my own and don't necessarily represent IBM's positions, strategies or opinions.

jonesn

Posted: Thu May 14, 2009 3:01 am Post subject:

Apprentice

Joined: 09 Jan 2002
Posts: 47

Thanks MGK,

By wrapping the expression to the right of the assignment in FIELDVALUE it converts to scalar & the assignment is successful. I am assuming it was failing because of the tree copy limitation I just discovered.

FYI here is the code fragment.

Set outRef.esb:invoiceNumber = fieldvalue (headRef.batchNumber);
Set outRef.esb:invoiceDate = fieldvalue (headRef.todaysYYYYMMDDChar);

Thanks
_________________
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Nick Jones
IBM Certified Solutions Expert (WebSphere MQ Integrator)

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