Domain-Driven Design with Java - A Practitioner’s Guide

Chapter 8: Implementing Long-Running Workflows

In the long run, the pessimist may be proven right, but the optimist has a better time on the trip.

— Daniel Reardon

In the previous chapters, we looked at handling commands and queries within the context of a single aggregate. All the scenarios we have looked at thus far have been limited to a single interaction. However, not all capabilities can be implemented in the form of a simple request-response interaction, requiring coordination across multiple external systems or human-centric operations, or both. In other cases, there may be a need to react to triggers that are non-deterministic (occur conditionally or not at all) and/or are time-bound (based on a deadline). This may require managing ...