Interface AbstractCache.StatsCounter

All Known Implementing Classes:

AbstractCache.SimpleStatsCounter

Enclosing class:

AbstractCache<K,V>

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

Author:

Charles Fry

Method Summary

Modifier and Type	Method	Description
void	recordEviction()	Records the eviction of an entry from the cache.
void	recordHits(int count)	Records cache hits.
void	recordLoadException(long loadTime)	Records the failed load of a new entry.
void	recordLoadSuccess(long loadTime)	Records the successful load of a new entry.
void	recordMisses(int count)	Records cache misses.
CacheStats	snapshot()	Returns a snapshot of this counter's values.

Method Details

recordHits

void recordHits(int count)

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

Parameters:

count - the number of hits to record

Since:

11.0

recordMisses

void recordMisses(int count)

Records cache misses. This should be called when a cache request returns a value that was not found in the cache. This method should be called by the loading thread, as well as by threads blocking on the load. 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.

Parameters:

count - the number of misses to record

Since:

11.0

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 successfully. In contrast to recordMisses(int), 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 recordMisses(int), 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

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.