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Microservices are not just code modules or libraries â they contain everything from the operating system, platform, framework, runtime and dependencies, packaged as one unit of execution. Each microservice is an independent, autonomous process with no dependency on other microservices. It doesnât even know or acknowledge the existence of other microservices. Microservices communicate with each other through language and platform-agnostic application programming interfaces (APIs). These APIs are typically exposed as Rest endpoints or can be invoked via lightweight messaging protocols such as RabbitMQ. They are loosely coupled with each other avoiding synchronous and blocking-calls whenever possible.
Most microservices frameworks focus on helping you build fragile, single instance microservices - which, by definition, arenât scalable or resilient. Lagom helps you build microservices as systems â Reactive systems, to be precise â so that your microservices are elastic and resilient from within. Building Reactive Systems can be hard, but Lagom abstracts the complexities away.