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Challenge

Designing an email application

3 Tasks

20 mins

Pega Platform 8.5
Visible to all users
Advanced Pega Platform 8.5 Pega Platform 8.6 English

Scenario

Front Stage needs to schedule the sending of automatically generated emails at a specific date and time in the future. When generating emails using this feature, FSG employees need to edit the content of the email. At any time before the email is scheduled to send, Front Stage employees must be able to easily edit the contents of the email, cancel it, or send it manually. If the email is not canceled or sent manually ahead of schedule, the system needs to send the email automatically at the scheduled date and time. It must be possible to incorporate this automatic email generation, scheduling, and editing capability into any present and future applications built for Front Stage.

Produce a design document for a solution that satisfies Front Stage's requirements for the automatic email generation, scheduling, and editing functionality. The design document describes the thought process used to arrive at the recommended approach and includes at least three viable alternative design options, a comparison of the Pros and Cons of each of the approaches considered, and an explanation as to why the recommended approach is preferred.

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Detailed Tasks

1 Identify design options

There are at least three possible approaches for a solution:

  1. Spun-off email process (flow) that is part of a Pega Component (pyMode=Component) component
  2. Job scheduler-processed email data instances
  3. Spun-off email subcase defined by a (pyMode=Application) modular built-on application

Spun-off email process component

The functionality that needs to send emails at a scheduled time can be defined in a process that is included in a (pyMode=Component) component. Case types reference this process within their life cycle. The component-defined process spins-off a second process. The spun-off process contains an assignment with a service-level agreement (SLA). The SLA reacts to a DateTime property defined by the component, one that any case type inherits.

Job scheduler-processed email data instances

The Data-Corr-Email class is extended to include scheduling information. Instances of that class are stored separately. Users can open email instances that are related to cases to which they have access. A job scheduler periodically queries these data instances to look for emails where the time-to-send is in the past, but the email has not been sent. When the job scheduler successfully sends the email, the job scheduler updates the data instance to flag the message as having been sent.

Email subcase component application

Create a (pyMode=Application) component application with a single email case that is always created as a child case. Data propagation is used to tell the Email child case when to send an email. The Email child case assumes that the parent case's most recently attached Data-Corr-Email instance contains the information about the email to be sent. The email child case supports a UI to allow email editing before the message is sent.

2 Evaluate design options

Design Pros Cons 
Spun-off email process
  • Simple design; easy to implement
  • Editing the email requires locking the case
  • Specialization options limited

Job scheduler-processed email data instances

  • Locking is independent of the case that created each instance
  • More difficult to manage

Email subcase component application

  • Subcase can be configured as Do not lock parent or inherit optimistic locking from its parent
  • Has its own life cycle, data model, settings, and views
  • Simplified reporting and security
  • Can be configured to be self testable
  • If an event is canceled, email subcases need to be withdrawn
  • More complex to implement

3 Recommend the best solution

The email subcase modular built-on application option is preferred because it:

  • Fully satisfies the requirements
  • Is more configurable
  • Simplifies testing

 



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