| Author |
Message
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| raj12121 |
 Posted: Wed Mar 09, 2011 8:57 pm Post subject: UDP Saga |
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Newbie
Joined: 09 Mar 2011
Posts: 8
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I have two message flows (udp1.msgflow and udp2.msgflow) in the same schema (project.test).
Requirement : Set up a UDP (e.g database schema ) which will be visible to all the flows inthe same schema.
Experiment:
Created an UDP (V1) in the flow edtitor and specified the UDP DECLARE ** syntax in the esql of flow1 (udp1.msgflow) with a default value DEFV1.
The value of UDP on udp1.msgflow is set to MYV1.
UDP variable is accessed from second flow.
Issue :
UDP variable V1 in udp1.msgflow correctly display the customised value i.e MYV1
Where as UDP variable V1 in udp2.msgflow displays the default value DEFV1.
Any ideas.
udp2.esql
| Code: |
BROKER SCHEMA project.test
CREATE COMPUTE MODULE udp2_Compute
CREATE FUNCTION Main() RETURNS BOOLEAN
BEGIN
CALL CopyMessageHeaders();
CALL CopyEntireMessage();
SET OutputRoot.XML.UDP.V1 = V1;
RETURN TRUE;
END;
CREATE PROCEDURE CopyMessageHeaders() BEGIN
DECLARE I INTEGER 1;
DECLARE J INTEGER;
SET J = CARDINALITY(InputRoot.*[]);
WHILE I < J DO
SET OutputRoot.*[I] = InputRoot.*[I];
SET I = I + 1;
END WHILE;
END;
CREATE PROCEDURE CopyEntireMessage() BEGIN
SET OutputRoot = InputRoot;
END;
END MODULE;
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udp1.esql
| Code: |
BROKER SCHEMA project.test
DECLARE V1 EXTERNAL CHARACTER 'DEFV1' ;
CREATE COMPUTE MODULE upd_Compute
CREATE FUNCTION Main() RETURNS BOOLEAN
BEGIN
CALL CopyMessageHeaders();
CALL CopyEntireMessage();
SET OutputRoot.XML.UDP.V1 = V1;
RETURN TRUE;
END;
CREATE PROCEDURE CopyMessageHeaders() BEGIN
DECLARE I INTEGER 1;
DECLARE J INTEGER;
SET J = CARDINALITY(InputRoot.*[]);
WHILE I < J DO
SET OutputRoot.*[I] = InputRoot.*[I];
SET I = I + 1;
END WHILE;
END;
CREATE PROCEDURE CopyEntireMessage() BEGIN
SET OutputRoot = InputRoot;
END;
END MODULE;
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| MQEnthu |
| Posted: Wed Mar 09, 2011 9:41 pm Post subject: |
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Partisan
Joined: 06 Oct 2008
Posts: 329
Location: India
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AFAIK... if you edit the UDP values using the Message Flow editor in a flow, the newly edited value is available to all the nodes in that flow....And the new value is not available to the other flow even though they are in same schema...
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It is good to remember the past,
but don't let past capture your future |
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| raj12121 |
| Posted: Thu Mar 10, 2011 11:50 am Post subject: |
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Newbie
Joined: 09 Mar 2011
Posts: 8
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| The value was edited using bar editor. How can this be achieved ? Any solution ? |
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| mqjeff |
| Posted: Thu Mar 10, 2011 12:47 pm Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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I do not believe that user defined properties exist outside the context of a given flow.
Likewise, ESQL SHARED variables are not shared between flows. |
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| raj12121 |
| Posted: Thu Mar 10, 2011 4:59 pm Post subject: |
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Newbie
Joined: 09 Mar 2011
Posts: 8
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Thanks mqjeff,
what is the solution for the below requirement .
Multiple flows in same schema requires a customisable property (e.g database schema) at deploy time. Instead of exposing UDPs for each and every flow .. is there a way to define one customisable property which will be visible to all the flows in the same schema.
Thanks |
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| smdavies99 |
| Posted: Thu Mar 10, 2011 10:20 pm Post subject: |
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Jedi Council
Joined: 10 Feb 2003
Posts: 6076
Location: Somewhere over the Rainbow this side of Never-never land.
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do you really mean
and not run time?
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Every time you reinvent the wheel the more square it gets (anon). If in doubt think and investigate before you ask silly questions. |
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| raj12121 |
| Posted: Fri Mar 11, 2011 3:15 am Post subject: |
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Newbie
Joined: 09 Mar 2011
Posts: 8
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| yes, my bad also should be visible at run time. |
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| mqjeff |
| Posted: Fri Mar 11, 2011 3:29 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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You are not asking how to define a variable that is visible to many flows - you already have that.
You are asking how to ensure that all of the flows access the same instance of that variable.
I don't think you can do that from ESQL, because the ESQL runtime is not constructed the same way that a JVM is constructed.
But I don't think you need to do this, really. How often is this variable really going to change? Does it really need to be changed without redeploying things? |
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| raj12121 |
| Posted: Fri Mar 11, 2011 3:36 am Post subject: |
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Newbie
Joined: 09 Mar 2011
Posts: 8
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| thanks mqjeff, i will go with defining udp for every flow. |
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| terminator_xyz |
| Posted: Tue Aug 19, 2014 4:16 pm Post subject: one question |
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Novice
Joined: 29 Jul 2014
Posts: 15
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sorry to reopen this topic.
If i need to use the UDP V1 in 2nd flow, should I still declare this UDP in 2nd flow, and not need to declare in 2nd esql using DECLARE EXTERNAL....? |
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