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by mr_nobody
2005 days ago
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I think the biggest difference is as defined by Martin Fowler: "
When building communication structures between different processes, we've seen many products and approaches that stress putting significant smarts into the communication mechanism itself. A good example of this is the Enterprise Service Bus (ESB), where ESB products often include sophisticated facilities for message routing, choreography, transformation, and applying business rules. The microservice community favours an alternative approach: smart endpoints and dumb pipes. Applications built from microservices aim to be as decoupled and as cohesive as possible - they own their own domain logic and act more as filters in the classical Unix sense - receiving a request, applying logic as appropriate and producing a response. These are choreographed using simple RESTish protocols rather than complex protocols such as WS-Choreography or BPEL or orchestration by a central tool." https://martinfowler.com/articles/microservices.html#SmartEn... |
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So here's another perspective, that of a software anthropologist .. .
Common patterns of networked systems were developed over decades, and as it developed over decades it built various advanced features on top of the core network call/response features - service busses - routing - useful abstractions like decoupling services from host processes - propogating security contexts through the chains of service calls that can develop when these systems evolve - strong typing, which enabled layers of tooling to replace manually doing jobs with these systems and various advanced features.
That was called SOA, because it looks at software architecture as a set of services.
Then along came a bunch of programmers that weren't very studious, started from scratch just doing basic message passing without all the advanced features that had been built up by the decades of previous hard won lessons. That was called microservices. Note the removal of the 'architecture' from microservices!
slightly /s