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Braam Smith (BraamCLSA)
Partner Success Tech Lead - APAC
Pegasystems Inc.
BraamCLSA Member since 2012 100 posts
Posted: October 29, 2020
Last activity: October 29, 2020

Implementing specializations of Pega OTB Classes [LSA Data Excellence]

Ideally a specialization of a capability delivered from a Pega class is driven by a justifiable, Client-specific need to vary the existing behavior. For example, the PegaData-Address.PostalCode property references an Edit Validate rule that checks the pattern entered for a Postal Code. 

The pattern enforced out-of-the-box may not be suitable in the Client's region, in which case the existing rule would be specialized to reference a different Edit Validate, or perhaps none at all.

A client-specific subclass MyOrg-Data-Address which direct-inherits from PegaData-Address allows the PostalCode property to be class-specialized in a way that allows applications that need this alternative PostalCode behavior. Those applications define Address properties that reference MyOrg-Data-Address as their data type. Should the Pega-provided behavior in PegaData-Address be needed by other applications for the same client, those applications can continue to engage it by referencing PegaData-Address for the data type of their Address properties.

This approach is more upgrade-friendly too, for should future improvements be provided to the PegaData-Address.PostalCode formats...

  • These improvements shall be honored by the client applications that referenced PegaData-Address for their Address data; whilst 
  • Those client applications that referenced MyOrg-Data-Address - consciously overriding the Pega implementation with something client-specific - continue to realize the specialized behavior at runtime.

Inevitably there will be situations where Ruleset-specialization is the only practical method of specialization available. Maintain an inventory in your project documentation of Pega-provided rules that have been masked by Ruleset-specialization, as these should be reviewed specifically when upgrading Pega.


Discussion on this topic was sought from the LSA Data Excellence (Pega 8.4) webinar conducted in July 2020. The webinar and its full set of discussions that arose from it are available at LSA Data Excellence: Webinar, Questions & Answers

***Edited by Moderator: Pooja to add Developer Knowledge Share tag***
Pega Platform 8.4.1 Data Integration Case Management Lead System Architect Senior System Architect Developer Knowledge Share