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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » Receiving variable length message over TCPIP

Receiving variable length message over TCPIP

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mjain

Posted: Tue Sep 04, 2012 6:42 am Post subject: Receiving variable length message over TCPIP

Novice

Joined: 01 May 2012
Posts: 15

Hi,
I have a message flow which sends data to remote host over TCPIPCLientOutput node and receives the response through TCPIPClientReceive node. The response is not a fixed length data but message length is sent in first four bytes. Also the remote host does not close the connection once it is done sending the response data. Now if I set property "Record Detection" of ClientReceive node as Closed Connection, it always times out and I cant set same to Parsed Record Sequence a I want to receive data in BLOB. Is there any way we can receive variable length data in BLOB format?....Is there any way I can use the first four bytes to know the length of response?. Any help is appreciated.

mqjeff

Posted: Tue Sep 04, 2012 6:56 am Post subject:

Grand Master

Joined: 25 Jun 2008
Posts: 17447

You don't say if the record is terminated by a delimiter. You should double-check that.

it's also dead-easy to create a message model that contains a 4 byte field and a blob string where the length of the blob is determined by the 4 byte field.

PEPERO

Posted: Tue Sep 04, 2012 9:55 pm Post subject:

Disciple

Joined: 30 May 2011
Posts: 177

You could use two receive nodes. the first one reads the 4 byte binary message length. Using a transformation node you could set the message length property of the second TCPIPRECEIVE node dynamically with in the localenvironment tree structure.

smdavies99

Posted: Tue Sep 04, 2012 10:25 pm Post subject:

Jedi Council

Joined: 10 Feb 2003
Posts: 6076
Location: Somewhere over the Rainbow this side of Never-never land.

PEPERO wrote:

This is a pretty common scenario.
The 1st node gets the leght information and then after converting it into an integer puts it into the LocelEnvironment and passes it onto the the second node. something like this may do the job.

Code:

CREATE COMPUTE MODULE My_Flow_Extract_TCPIP_Length
CREATE FUNCTION Main() RETURNS BOOLEAN
BEGIN
   declare cLength char;
   set cLength = cast(InputRoot.BLOB.BLOB as char CCSID 1208);
   set OutputLocalEnvironment.TCPIP.Receive.Length = trim(right(cLength,4));
   RETURN TRUE;
END;

_________________
WMQ User since 1999
MQSI/WBI/WMB/'Thingy' User since 2002
Linux user since 1995

Every time you reinvent the wheel the more square it gets (anon). If in doubt think and investigate before you ask silly questions.

mjain

Posted: Tue Sep 04, 2012 11:48 pm Post subject:

Novice

Joined: 01 May 2012
Posts: 15

Thanks Pepero....
Even I thought of same way and was succesfully able to test it as well. But I was not sure if its good way to have two receive nodes.

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