Question
Morgan Stanley
IN
Last activity: 4 Oct 2018 13:54 EDT
DSM: How to execute a Data Flow
We have two ways of calling a data flow from an activity:
1. call Data-Decision-DDF-RunOptions.pxRunSingleCaseDDF
2. DataFlow-Execute
Is there any difference (technically) between the above two methods of calling data flow
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Accepted Solution
Pegasystems Inc.
NL
Hi haria,
Just for completeness, there's one more way of executing data flows: Data-Decision-DDF-RunOptions.pxStartRun.
pxStartRun and pxRunSingleCaseDDF are activities for two specific use cases, the first one is used to trigger a batch run and the second one allows the user to submit a page for processing via data flow and extract the result at the end of the run. Technically the first one is an async run of a data flow with defined sources and destinations while the second one is a sync execution to be used with a data flow with Abstract source and destination so the input can be provided and the output can be extracted.
DataFlow-Execute is a friendlier way of executing runs. It takes into consideration the type of data flow that needs to be executed and exposes the possible operations to be executed like Browse, Save, Process and etc. (Please, refer to the help section for more details on this)
I recommend you use DataFlow-Execute to trigger a run as it supports all possible operations on data flows and is simpler to use.
Let me know if you need more details on it.
Regards,
Henrique
Morgan Stanley
IN
Thanks for the reply Henrique.
One more question:
What does the option Submit step page do..
Its being displayed in the DataFlow-Execute method when i call the data flow with both output and input as abstract.
Pegasystems Inc.
NL
Hi haria,
That checkbox gives the option of submiting either the Step page of the activity step or a different page as the input data for the selected data flow.
Keep it checked if you want to use the step page as input data or uncked it if you want to input a different page.
Regards,
Henrique
futureproofAI
HU
Hi pereh,
Thank you for summarizing the differences of these activities and the DataFlow-Execute method.
I would like to ask another question regarding this topic.
If pxStartRun is async and pxRunSingleCaseDDF is sync, how is DataFlow-Execute being executed?
As I saw in previous posts (for example here: https://collaborate.pega.com/discussion/it-true-whenever-cache-hit-returned-system-does-not-invoke-database) it should be async but in https://academy.pega.com/library/72/decisioning-as-a-service training material - when they prepare the response in the service - the don't use any wait for the results of the DataFlow-Execute.
Thank you for the help,
Mate Jani
Pegasystems Inc.
NL
Note that as of 7.4 we also have a dedicated shape in the process flow to execute a single decision. This is showcased in DMSample, see e.g. the Offer Recommendation flow for Customer Desk.
