Cloud Native Development Patterns and Best Practices by John Gilbert

Author:John Gilbert
Language: eng
Format: epub, pdf
Publisher: Packt
Published: 2018-02-12T10:51:17+00:00

Solution

Redesign the user experience to be eventually consistent. Replace synchronous inter-component communication with asynchronous inter-component communication by using the event stream to publish events which trigger downstream commands. Upstream components apply the Database-First variant of the Event Sourcing pattern to publish domain events that reflect changes in their state. Downstream components react to the domain events by performing a command and publishing a domain event to reflect the outcome of the command.

This cycle repeats through as many steps as are necessary to complete the activity. The cycle can fan-out to perform steps in parallel and then fan-in as well. Collaborators apply the CQRS pattern to avoid needing to synchronously retrieve relevant information. The CQRS Event Sourced Join technique can be used to implement fan-in. Ultimately, the outcome of the collaboration is revealed to the user.

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