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How is an integration event handled in a microservice?
When an event is published to multiple receiver microservices (to as many microservices as are subscribed to the integration event), the appropriate event handler in each receiver microservice handles the event. An integration event is basically a data-holding class, as in the following example:
Do you need synchronous communication between multiple microservices?
If possible, never depend on synchronous communication (request/response) between multiple microservices, not even for queries. The goal of each microservice is to be autonomous and available to the client consumer, even if the other services that are part of the end-to-end application are down or unhealthy.
When to publish an event in microservice architecture?
In this architecture style, a service publishes an event when there are changes to its public models or entities. Interested services can subscribe to these events. For example, another service could use the events to construct a materialized view of the data that is more suitable for querying.
Can a domain be modeled across multiple microservices?
Therefore, you should identify and design them carefully. An entity’s identity can cross multiple microservices or Bounded Contexts. The same identity (that is, the same Id value, although perhaps not the same domain entity) can be modeled across multiple Bounded Contexts or microservices.
What do you need to know about integration events?
Integration Events: for communication from entities in different domains, wen need to implement an event-based communication where a microservice publishes an event when something notable happens, such as when it updates a business entity. Other microservices subscribe to those events.
How are integration events used in CQRS design?
This kind of Integration Event is pretty similar to the events used in a full CQRS with a different “reads-database” than the “writes-database” and you need to propagate changes/events from the transactional or “writes-database” to the “reads-database”.
Why do we need to know about microservices?
It uses the concept of requests, responses, commands, or events to abstract the implementations behind a single entry point. This way of implementing the application logic helps the developers in your team keep the logic separated from the web part of the application.