Interface QueryCachingPolicy

All Known Implementing Classes:
UsageTrackingQueryCachingPolicy

public interface QueryCachingPolicy
A policy defining which filters should be cached.

Implementations of this class must be thread-safe.

See Also:
WARNING: This API is experimental and might change in incompatible ways in the next release.
  • Method Summary

    Modifier and Type
    Method
    Description
    void
    onUse(Query query)
    Callback that is called every time that a cached filter is used.
    boolean
    Whether the given Query is worth caching.
  • Method Details

    • onUse

      void onUse(Query query)
      Callback that is called every time that a cached filter is used. This is typically useful if the policy wants to track usage statistics in order to make decisions.
    • shouldCache

      boolean shouldCache(Query query) throws IOException
      Whether the given Query is worth caching. This method will be called by the QueryCache to know whether to cache. It will first attempt to load a DocIdSet from the cache. If it is not cached yet and this method returns true then a cache entry will be generated. Otherwise an uncached scorer will be returned.
      Throws:
      IOException