Component

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Component

Components are the main building blocks in Polylith.

A component is an encapsulated block of code that can be assembled together with a base and a set of other components into services, libraries or tools. Components achieve encapsulation and composability by separating their private implementation from their public interface:
The dark green represents the implementation and the light green represents the interface.
Each component lives in a separate directory under the components directory, and contains a src, test and resources directory:
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▾ workspace
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  ▾ components
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    ▾ mycomponent
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      ▸ src
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      ▸ test
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      ▸ resources
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The src directory often contains at least two namespaces, one for the interface and one for the implementation:
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▾ src
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    interface.clj
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    core.clj
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A component's interface is a namespace that exposes a collection of functions for other components or bases to call. Each function in a component’s interface “passes-through” to an equivalent function in its private implementation (the core namespace in this example). This “pass-through” approach enables full code navigation and refactoring, whilst maintaining encapsulation.
Code examples of components can be found in the RealWorld example app and in the Polylith Tool.

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Last modified 2mo ago

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