38 lines
1.5 KiB
Markdown
38 lines
1.5 KiB
Markdown
# Module Taxonomy
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Marginalia has a lot of modules, and their names have specific meanings with architectural consequences. These are outlined below.
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## Library
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A library is independent of the search engine domain. It solves a single problem. Maybe it's a B-Tree implementation,
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a locality sensitive hash algorithm. Whatever. It does not know what an URL is, or a document. It's more primitive
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than that.
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These could hypothetically be broken off and shipped separately, or just yoinked from the codebase and used elsewhere.
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These libraries are co-licensed under MIT to facilitate that, the rest of the search engine is and will be AGPL.
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## Feature
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A feature is essentially a domain-specific library. It solves some specific problem. Maybe extracting keywords from a
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document, or parsing a search query. Features exist to separate conceptually isolated logic. It may only depend on
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libraries and models.
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## Models
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A module package contains domain-specific data representations. It may contain light logic related to e.g. serialization, but should
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primarily focus on the data.
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## APIs
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A module package contains domain-specific interface between processes.
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## Process
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A process is a batch job that reads files and performs some task. It may depend on libraries, features and models. It may not explicitly
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depend on a service or another process.
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## Service
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A service offers a web service interface. It may depend on libraries, features and models and APIs. It may not explicitly depend on a
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process or another service.
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