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42 lines
2.2 KiB
Markdown
42 lines
2.2 KiB
Markdown
# Architecture
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Datasheet Server uses the architecture diagrammed above to allow effective
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management of the sheets it represents.
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It exposes an API with four endpoints:
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* `/:sheet/:tab/:resource` - the primary means of accessing data in the
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server. The name of a sheet is specified in
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[sheets_config.js](https://github.com/forensic-architecture/datasheet-server/blob/develop/src/sheets_config.js#L7).
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Each tab on the sheet is in lower case, with spaces replaced by
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underscores. The resource name is the same as the name of the blueprinter
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specified for the tab is sheets_config.js.
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* `/:sheet/:tab/:resource/:id` - when the resource is a list, items in the list
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can be accessed individually as well.
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* `/update` - when this route is queried with a GET request, each of the
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fetchers in the server will update their models from the relevant sheet.
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* `/blueprints` - a JSON object that represents all available sheets, tabs, and
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resources in the server.
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# Controller
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The [controller](https://github.com/forensic-architecture/datasheet-server/blob/develop/src/lib/Controller.js)
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manages all of the fetchers in the server. Its `update` triggers the update
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mechanisms of all the `update`s in the fetchers it manages. Its `retrieve` and
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`retrieveFrag` methods find the appropriate fetcher, and trigger its
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respectively named method. Its `bluerprints` method collects the blueprints
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from all fetchers, and presents them as a single list.
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# Fetcher
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The [fetcher](https://github.com/forensic-architecture/datasheet-server/blob/develop/src/lib/Fetcher.js)
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is the most complex component in datasheet server. Its responsiblity is to
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interface with a sheet, and store the data from that sheet in a model. It also
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makes information from that model available to the controller.
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# Model
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The model layer is an [interface](https://github.com/forensic-architecture/datasheet-server/blob/develop/src/models/Interface.js)
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that specifies how stored data must be made available to a fetcher. The
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implementation of the model layer ([StoreJson](https://github.com/forensic-architecture/datasheet-server/blob/develop/src/models/StoreJson.js)
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is one example) determines the time and space complexity of retrieval.
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