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In order to clarify the semantic of lookup, we'd like to introduce some top-level APIs for general lookup operations without caching:

• LookupFunction / AsyncLookupFunction, an extended version of TableFunction to make the API more straight forward.
• LookupFunctionProvider / AsyncLookupProvider, serve as the creator of LookupFunction / AsyncLookupFunction in table source

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More specifically,  we'd like to provide public interfaces for the most 2 common cases to lookup source developers, which we call are named as partial and full caching.

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• FullCachingLookupProvider, for reusing the ability of scanning.
• FullCachingReloadTriggerCacheReloadTrigger, for customizing reloading strategies of all entries in the full cache. 

Also we'd like to provide two default implementations of CacheReloadTrigger:

• PeriodicCacheReloadTrigger, for triggering reload periodically with a specific interval
• TimedCacheReloadTrigger, for triggering reload at the specific time and repeat with the interval in days.

Public Interfaces

Lookup Functions

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