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31 lines
2 KiB
Markdown
31 lines
2 KiB
Markdown
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# Fabric API Lookup API (v1)
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This module allows API instances to be associated with game objects without specifying how the association is implemented.
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This is useful when the same API could be implemented more than once or implemented in different ways.
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See also the [package-info.java file](src/main/java/net/fabricmc/fabric/api/lookup/v1/package-info.java).
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* What we call an API is any object that can be offered or queried, possibly by different mods, to be used in an agreed-upon manner.
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* This module allows flexible retrieving of such APIs from blocks in the world, represented by the generic type `A`.
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* It also provides building blocks for defining custom ways of retrieving APIs from other game objects.
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# Retrieving APIs from blocks
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See the javadoc of `BlockApiLookup` for a full usage example.
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## [`BlockApiLookup`](src/main/java/net/fabricmc/fabric/api/lookup/v1/block/BlockApiLookup.java)
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The primary way of querying API instances for blocks in the world.
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It exposes a `find` function to retrieve an API instance, and multiple `register*` functions to register Apis for blocks and block entities.
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Instances can be obtained using the `get` function.
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## [`BlockApiCache`](src/main/java/net/fabricmc/fabric/api/lookup/v1/block/BlockApiCache.java)
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A `BlockApiLookup` bound to a position and a server world, allowing much faster repeated API queries.
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# Retrieving APIs from custom objects
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The subpackage `custom` provides helper classes to accelerate implementations of `ApiLookup`s for custom objects,
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similar to the existing `BlockApiLookup`, but with different query parameters.
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## [`ApiLookupMap`](src/main/java/net/fabricmc/fabric/api/lookup/v1/custom/ApiLookupMap.java)
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A map meant to be used as the backing storage for custom `ApiLookup` instances, to implement a custom equivalent of `BlockApiLookup#get`.
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## [`ApiProviderMap`](src/main/java/net/fabricmc/fabric/api/lookup/v1/custom/ApiProviderMap.java)
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A fast thread-safe copy-on-write map meant to be used as the backing storage for registered providers.
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