Microservices

Use it if you care about independent deployability!

This requires the following: - Information hiding - Low coupling - Strong cohesion

Cohesion: code that changes together, stays together

We need the following property in our system:

Note

“A structure is stable if cohesion is strong and coupling is low” - Constantine S. Law

Types of coupling (in order of increasing coupling):

• Domain: Behaviour coupling (Service A depends on Service B)

• Common: Data coupling (Services sharing the same resource e.g. database)

• Content: Even worse data coupling aka pathalogical coupling (Service depends on the internals of another service e.g. database)

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• Tag: misc