strangler pattern - Monolithic application is incrementally modernized by extracting services from the application untill the monolithic application shrinks to no existence or becomes one of the service in the microservice architecture.
This will ensure that the business served by the application will not get impacted when the application is being cut over to a microservice architecture.
Strategies for refactoring a monolith to microservices:
1. Implement new features as services (stop monolith from growing)
While this will help the monolith from growing further and gives the microservice benefits of faster development/deployment, a new feature may not always qualify as a separate service.
API gateway is the minimum requirement for introducing new service as it needs to be in front of the monolith application and the new service so that the request can be routed appropriately.
REST/domain message interactions between the new service and monolithic application is required for getting the data for the new service.
2. Separate presentation tier and backend
Move the presentation tier to a separate application using Single Page Application frameworks like Angular/React. This will allow the UI development to be decoupled from backend and also tests the REST APIs which are to be directly exposed to the end user.
3. Break up monolith by extracting services based on the business capabilities
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