com.google.common.cache
Interface AbstractCache.StatsCounter

All Known Implementing Classes:

AbstractCache.SimpleStatsCounter

Enclosing class:

AbstractCache<K,V>

@Beta
public static interface AbstractCache.StatsCounter

Accumulates statistics during the operation of a Cache for presentation by Cache.stats(). This is solely intended for consumption by Cache implementors.

Since:

10.0

Method Summary

void	recordConcurrentMiss() Records a single concurrent miss.
void	recordEviction() Records the eviction of an entry from the cache.
void	recordHit() Records a single hit.
void	recordLoadException(long loadTime) Records the failed load of a new entry.
void	recordLoadSuccess(long loadTime) Records the successful load of a new entry.
CacheStats	snapshot() Returns a snapshot of this counter's values.

Method Detail

recordHit

void recordHit()

Records a single hit. This should be called when a cache request returns a cached value.

recordLoadSuccess

void recordLoadSuccess(long loadTime)

Records the successful load of a new entry. This should be called when a cache request causes an entry to be loaded, and the loading completes succesfully. In contrast to recordConcurrentMiss(), this method should only be called by the loading thread.

Parameters:

loadTime - the number of nanoseconds the cache spent computing or retrieving the new value

recordLoadException

void recordLoadException(long loadTime)

Records the failed load of a new entry. This should be called when a cache request causes an entry to be loaded, but an exception is thrown while loading the entry. In contrast to recordConcurrentMiss(), this method should only be called by the loading thread.

Parameters:

loadTime - the number of nanoseconds the cache spent computing or retrieving the new value prior to an exception being thrown

recordConcurrentMiss

void recordConcurrentMiss()

Records a single concurrent miss. This should be called when a cache request returns a value which was loaded by a different thread. In contrast to recordLoadSuccess(long) and recordLoadException(long), this method should never be called by the loading thread. Multiple concurrent calls to Cache lookup methods with the same key on an absent value should result in a single call to either recordLoadSuccess or recordLoadException and multiple calls to this method, despite all being served by the results of a single load operation.

recordEviction

void recordEviction()

Records the eviction of an entry from the cache. This should only been called when an entry is evicted due to the cache's eviction strategy, and not as a result of manual invalidations.

snapshot

CacheStats snapshot()

Returns a snapshot of this counter's values. Note that this may be an inconsistent view, as it may be interleaved with update operations.