com.yammer.metrics.ehcache

Class InstrumentedEhcache

java.lang.Object

net.sf.ehcache.constructs.EhcacheDecoratorAdapter

com.yammer.metrics.ehcache.InstrumentedEhcache

All Implemented Interfaces:

Cloneable, net.sf.ehcache.Ehcache, net.sf.ehcache.terracotta.InternalEhcache

public class InstrumentedEhcache
extends net.sf.ehcache.constructs.EhcacheDecoratorAdapter

An instrumented Ehcache instance.

Field Summary

Fields inherited from class net.sf.ehcache.constructs.EhcacheDecoratorAdapter

underlyingCache

Method Summary

Methods

Modifier and Type	Method and Description
net.sf.ehcache.Element	get(Object key)
net.sf.ehcache.Element	get(Serializable key)
static net.sf.ehcache.Ehcache	instrument(net.sf.ehcache.Ehcache cache) Instruments the given Ehcache instance with get and put timers and a set of gauges for Ehcache's built-in statistics: hits The number of times a requested item was found in the cache. in-memory-hits Number of times a requested item was found in the memory store. off-heap-hits Number of times a requested item was found in the off-heap store. on-disk-hits Number of times a requested item was found in the disk store. misses Number of times a requested item was not found in the cache. in-memory-misses Number of times a requested item was not found in the memory store. off-heap-misses Number of times a requested item was not found in the off-heap store. on-disk-misses Number of times a requested item was not found in the disk store. objects Number of elements stored in the cache. in-memory-objects Number of objects in the memory store. off-heap-objects Number of objects in the off-heap store. on-disk-objects Number of objects in the disk store. mean-get-time The average get time.
void	put(net.sf.ehcache.Element element)
void	put(net.sf.ehcache.Element element, boolean doNotNotifyCacheReplicators)
net.sf.ehcache.Element	putIfAbsent(net.sf.ehcache.Element element)

Methods inherited from class net.sf.ehcache.constructs.EhcacheDecoratorAdapter

acquireReadLockOnKey, acquireWriteLockOnKey, addPropertyChangeListener, bootstrap, calculateInMemorySize, calculateOffHeapSize, calculateOnDiskSize, clearStatistics, clone, createQuery, disableDynamicFeatures, dispose, evictExpiredElements, flush, getAll, getAllWithLoader, getAverageGetTime, getAverageSearchTime, getBootstrapCacheLoader, getCacheConfiguration, getCacheEventNotificationService, getCacheExceptionHandler, getCacheManager, getDiskStoreSize, getGuid, getInternalContext, getKeys, getKeysNoDuplicateCheck, getKeysWithExpiryCheck, getLiveCacheStatistics, getMemoryStoreSize, getName, getOffHeapStoreSize, getQuiet, getQuiet, getRegisteredCacheExtensions, getRegisteredCacheLoaders, getRegisteredCacheWriter, getSampledCacheStatistics, getSearchAttribute, getSearchesPerSecond, getSize, getSizeBasedOnAccuracy, getStatistics, getStatisticsAccuracy, getStatus, getWithLoader, getWriterManager, hasAbortedSizeOf, initialise, isClusterBulkLoadEnabled, isClusterCoherent, isDisabled, isElementInMemory, isElementInMemory, isElementOnDisk, isElementOnDisk, isExpired, isKeyInCache, isNodeBulkLoadEnabled, isNodeCoherent, isPinned, isReadLockedByCurrentThread, isSampledStatisticsEnabled, isSearchable, isStatisticsEnabled, isValueInCache, isWriteLockedByCurrentThread, load, loadAll, putAll, putQuiet, putWithWriter, recalculateSize, registerCacheExtension, registerCacheLoader, registerCacheUsageListener, registerCacheWriter, releaseReadLockOnKey, releaseWriteLockOnKey, remove, remove, remove, remove, removeAll, removeAll, removeAll, removeAll, removeAndReturnElement, removeCacheUsageListener, removeElement, removePropertyChangeListener, removeQuiet, removeQuiet, removeWithWriter, replace, replace, setBootstrapCacheLoader, setCacheExceptionHandler, setCacheManager, setDisabled, setDiskStorePath, setName, setNodeBulkLoadEnabled, setNodeCoherent, setPinned, setSampledStatisticsEnabled, setStatisticsAccuracy, setStatisticsEnabled, setTransactionManagerLookup, toString, tryReadLockOnKey, tryWriteLockOnKey, unpinAll, unregisterCacheExtension, unregisterCacheLoader, unregisterCacheWriter, waitUntilClusterBulkLoadComplete, waitUntilClusterCoherent

Methods inherited from class java.lang.Object

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

Method Detail

instrument

public static net.sf.ehcache.Ehcache instrument(net.sf.ehcache.Ehcache cache)

Instruments the given Ehcache instance with get and put timers and a set of gauges for Ehcache's built-in statistics:

hits	The number of times a requested item was found in the cache.
in-memory-hits	Number of times a requested item was found in the memory store.
off-heap-hits	Number of times a requested item was found in the off-heap store.
on-disk-hits	Number of times a requested item was found in the disk store.
misses	Number of times a requested item was not found in the cache.
in-memory-misses	Number of times a requested item was not found in the memory store.
off-heap-misses	Number of times a requested item was not found in the off-heap store.
on-disk-misses	Number of times a requested item was not found in the disk store.
objects	Number of elements stored in the cache.
in-memory-objects	Number of objects in the memory store.
off-heap-objects	Number of objects in the off-heap store.
on-disk-objects	Number of objects in the disk store.
mean-get-time	The average get time. Because ehcache support JDK1.4.2, each get time uses System.currentTimeMillis(), rather than nanoseconds. The accuracy is thus limited.
mean-search-time	The average execution time (in milliseconds) within the last sample period.
eviction-count	The number of cache evictions, since the cache was created, or statistics were cleared.
searches-per-second	The number of search executions that have completed in the last second.
accuracy	A human readable description of the accuracy setting. One of "None", "Best Effort" or "Guaranteed".

N.B.: This enables Ehcache's sampling statistics with an accuracy level of "none."

Parameters:

cache - an Ehcache instance

Returns:

an instrumented decorator for cache

See Also:

Statistics

get

public net.sf.ehcache.Element get(Object key)
                           throws IllegalStateException,
                                  net.sf.ehcache.CacheException

Specified by:

get in interface net.sf.ehcache.Ehcache

Overrides:

get in class net.sf.ehcache.constructs.EhcacheDecoratorAdapter

Throws:

IllegalStateException

net.sf.ehcache.CacheException

get

public net.sf.ehcache.Element get(Serializable key)
                           throws IllegalStateException,
                                  net.sf.ehcache.CacheException

Specified by:

get in interface net.sf.ehcache.Ehcache

Overrides:

get in class net.sf.ehcache.constructs.EhcacheDecoratorAdapter

Throws:

IllegalStateException

net.sf.ehcache.CacheException

put

public void put(net.sf.ehcache.Element element)
         throws IllegalArgumentException,
                IllegalStateException,
                net.sf.ehcache.CacheException

Specified by:

put in interface net.sf.ehcache.Ehcache

Overrides:

put in class net.sf.ehcache.constructs.EhcacheDecoratorAdapter

Throws:

IllegalArgumentException

IllegalStateException

net.sf.ehcache.CacheException

put

public void put(net.sf.ehcache.Element element,
       boolean doNotNotifyCacheReplicators)
         throws IllegalArgumentException,
                IllegalStateException,
                net.sf.ehcache.CacheException

Specified by:

put in interface net.sf.ehcache.Ehcache

Overrides:

put in class net.sf.ehcache.constructs.EhcacheDecoratorAdapter

Throws:

IllegalArgumentException

IllegalStateException

net.sf.ehcache.CacheException

putIfAbsent

public net.sf.ehcache.Element putIfAbsent(net.sf.ehcache.Element element)
                                   throws NullPointerException

Specified by:

putIfAbsent in interface net.sf.ehcache.Ehcache

Overrides:

putIfAbsent in class net.sf.ehcache.constructs.EhcacheDecoratorAdapter

Throws:

NullPointerException