io.druid.query

Interface CacheStrategy<T,CacheType,QueryType extends Query<T>>

public interface CacheStrategy<T,CacheType,QueryType extends Query<T>>

Method Summary

Modifier and Type	Method and Description
byte[]	computeCacheKey(QueryType query) Computes the cache key for the given query
com.fasterxml.jackson.core.type.TypeReference<CacheType>	getCacheObjectClazz() Returns the class type of what is used in the cache
com.google.common.base.Function<T,CacheType>	prepareForCache() Returns a function that converts from the QueryType's result type to something cacheable.
com.google.common.base.Function<CacheType,T>	pullFromCache() A function that does the inverse of the operation that the function prepareForCache returns

Method Detail

computeCacheKey

byte[] computeCacheKey(QueryType query)

Computes the cache key for the given query

Parameters:

query - the query to compute a cache key for

Returns:

the cache key

getCacheObjectClazz

com.fasterxml.jackson.core.type.TypeReference<CacheType> getCacheObjectClazz()

Returns the class type of what is used in the cache

Returns:

Returns the class type of what is used in the cache

prepareForCache

com.google.common.base.Function<T,CacheType> prepareForCache()

Returns a function that converts from the QueryType's result type to something cacheable. The resulting function must be thread-safe.

Returns:

a thread-safe function that converts the QueryType's result type into something cacheable

pullFromCache

com.google.common.base.Function<CacheType,T> pullFromCache()

A function that does the inverse of the operation that the function prepareForCache returns

Returns:

A function that does the inverse of the operation that the function prepareForCache returns