Managing State in Luminus

How to Handle Stateful Resources in Clojure Applications

Most real-world applications will interact with external resources such as databases. Typically, in order to interact with a database, we have to initialize a connection when our application starts, use this connection to access the database, and then tear it down when the application shuts down.

In some cases, these resources may even depend on one another. We may be getting configuration from one resource and then using it to initialize a different resource. A large application may have a number of different resources that are interdependent and have to be coordinated.

The advantage of this approach is that it allows us to keep the application code completely stateless and lets us inject the stateful resources at runtime. The two main benefits are that the core application logic remains pure and we can easily provide mock resources to it for testing.

That’s a fine approach for building applications, but there are tradeoffs when using Component. Component introduces simplicity by providing a formal separation between pure and impure code, but it also adds complexity in terms of the structure of the application.

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