Package org.apache.druid.client.cache

Class BackgroundCachePopulator

java.lang.Object

org.apache.druid.client.cache.BackgroundCachePopulator

All Implemented Interfaces:

CachePopulator

public class BackgroundCachePopulator
extends Object
implements CachePopulator

CachePopulator implementation that uses a ExecutorService thread pool to populate a cache in the background. Used if config "druid.*.cache.numBackgroundThreads" is greater than 0.

Constructor Summary

Constructors

Constructor	Description
BackgroundCachePopulator(ExecutorService exec, com.fasterxml.jackson.databind.ObjectMapper objectMapper, CachePopulatorStats cachePopulatorStats, long maxEntrySize)

Method Summary

Modifier and Type	Method	Description
<T, CacheType> Sequence<T>	wrap(Sequence<T> sequence, Function<T,CacheType> cacheFn, Cache cache, Cache.NamedKey cacheKey)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

BackgroundCachePopulator

public BackgroundCachePopulator(ExecutorService exec,
 com.fasterxml.jackson.databind.ObjectMapper objectMapper,
 CachePopulatorStats cachePopulatorStats,
 long maxEntrySize)

Method Details

wrap

public <T,
CacheType> Sequence<T> wrap(Sequence<T> sequence,
 Function<T,CacheType> cacheFn,
 Cache cache,
 Cache.NamedKey cacheKey)

Specified by:

wrap in interface CachePopulator