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ribs2011 · Posted: Fri Nov 25, 2011 11:46 am Post subject:

The msgflow goes as mentioned below:

MQInput >> Database1 >> Database2 >>(OUT1) RouteToLabel1
>>(OUT2) RouteToLabel2
label1 >> MQOutput1
label2 >> MQOutput2
label3 >> MQOutput3

ESQL for Datebase1 :
------------------
CREATE DATABASE MODULE DATABASE1
CREATE FUNCTION Main() RETURNS BOOLEAN
BEGIN

SET LocalEnvironment.Destination.RouterList.DestinationData[1].LabelName = 'label1';
SET LocalEnvironment.Destination.RouterList.DestinationData[2].LabelName = 'label2';
SET LocalEnvironment.Destination.RouterList.DestinationData[2].LabelName = 'label3';
RETURN TRUE;
END;
END MODULE;

ESQL for Datebase2 :
------------------
CREATE DATABASE MODULE DATABASE2
CREATE FUNCTION Main() RETURNS BOOLEAN
BEGIN
PROPAGATE TO TERMINAL 'out';
PROPAGATE TO TERMINAL 'out1';
RETURN FALSE;
END;
END MODULE;

**Mode property of both the RouteToLabel nodes are configured for 'Route to Last'

a. Drive the flow by putting any message
b. At Database1 node the LocalEnvironment variables will be assigned
c. At Database2 node the first Propogate statement gets executed and the message goes through the OUT1 terminal to RouteToLabel1 node. As per the mode property, the RouteToLabel node routes the message to label3 and removes this entry.
At this point the DestinationList in the LocalEnvironment tree shows only 2 entries, label1 and label2.
d. Now, the control comes back to Database2 node and executes the Propogate 2 statement. At this point the LocalEnvironment again shows the DestinationList having label3 which was deleted in point c by RouteToLabel node. And the message goes through the OUT2 terminal and to RouteToLabel2 node and the RouteToLabel node again routes it to label3 and removes it.

Question:
---------
At point c, the first RouteToLabel node routes the message to label3 and removes the last entry, label3. But when the control again reaches the next Propogate statement, again we get the original LocalEnvironment tree with label3 in it.

My guess here is that the Propogate statement only propogates a copy of the message from the buffer and when the control returns, we again get the unmodified message tree. Is this true ? Else can some one explain on this behaviour.

Thanks in advance !!