org.apache.jackrabbit.oak.plugins.document.persistentCache

Class PersistentCacheStats

java.lang.Object

javax.management.StandardMBean

org.apache.jackrabbit.oak.commons.jmx.AnnotatedStandardMBean

org.apache.jackrabbit.oak.plugins.document.persistentCache.PersistentCacheStats

All Implemented Interfaces:

DynamicMBean, MBeanRegistration, CacheStatsMBean, PersistentCacheStatsMBean

public class PersistentCacheStats
extends AnnotatedStandardMBean
implements PersistentCacheStatsMBean

Persistence Cache Statistics.

Field Summary

Fields inherited from interface org.apache.jackrabbit.oak.api.jmx.PersistentCacheStatsMBean

TYPE

Constructor Summary

Constructors

Constructor and Description
PersistentCacheStats(CacheType cacheType, StatisticsProvider provider)

Method Summary

Modifier and Type	Method and Description
void	addWriteGeneration(int generation)
String	cacheInfoAsString() Gathers the stats of the cache for logging.
long	estimateCurrentWeight() Total weight of the complete cache.
double	getAverageLoadPenalty() Returns the average time spent loading new values.
CompositeData	getBroadcastRecvRateHistory()
long	getElementCount() Get the number of elements/objects in the cache.
long	getEvictionCount() Returns the number of times an entry has been evicted.
long	getHitCount() Returns the number of times com.google.common.cache.Cache lookup methods have returned a cached value.
CompositeData	getHitPercentageHistory()
double	getHitRate() Returns the ratio of cache requests which were hits.
CompositeData	getHitRateHistory()
CompositeData	getInvalidateAllRateHistory()
CompositeData	getInvalidateOneRateHistory()
long	getLoadCount() Returns the total number of times that com.google.common.cache.Cache lookup methods attempted to load new values.
long	getLoadExceptionCount() Returns the number of times com.google.common.cache.Cache lookup methods threw an exception while loading a new value.
double	getLoadExceptionRate() Returns the ratio of cache loading attempts which threw exceptions.
CompositeData	getLoadExceptionRateHistory()
CompositeData	getLoadRateHistory()
long	getLoadSuccessCount() Returns the number of times com.google.common.cache.Cache lookup methods have successfully loaded a new value.
long	getMaxTotalWeight() The maximum weight of entries the cache may contain.
long	getMissCount() Returns the number of times com.google.common.cache.Cache lookup methods have returned an uncached (newly loaded) value, or null.
double	getMissRate() Returns the ratio of cache requests which were misses.
String	getName()
CompositeData	getPutRateHistory()
CompositeData	getPutRejectedAlreadyPersistedRateHistory()
CompositeData	getPutRejectedAsCachedInSecRateHistory()
CompositeData	getPutRejectedEntryNotUsedRateHistory()
CompositeData	getPutRejectedQueueFullRateHistory()
long	getRequestCount() Returns the number of times com.google.common.cache.Cache lookup methods have returned either a cached or uncached value.
CompositeData	getRequestRateHistory()
long	getTotalLoadTime() Returns the total number of nanoseconds the cache has spent loading new values.
CompositeData	getUsedSpaceHistory()
void	markBytesWritten(long numBytes)
void	markException()
void	markHit()
void	markInvalidateAll()
void	markInvalidateOne()
void	markPut()
void	markPutRejectedAlreadyPersisted()
void	markPutRejectedAsCachedInSecondary()
void	markPutRejectedEntryNotUsed()
void	markPutRejectedQueueFull()
void	markRecvBroadcast()
void	markRequest()
void	removeReadGeneration(int generation)
void	resetStats() Reset the cache stats
TimerStats.Context	startLoaderTimer()
TimerStats.Context	startReadTimer()

Methods inherited from class org.apache.jackrabbit.oak.commons.jmx.AnnotatedStandardMBean

getDescription, getDescription, getDescription, getDescription, getImpact, getParameterName

Methods inherited from class javax.management.StandardMBean

cacheMBeanInfo, getAttribute, getAttributes, getCachedMBeanInfo, getClassName, getConstructors, getDescription, getDescription, getDescription, getImplementation, getImplementationClass, getMBeanInfo, getMBeanInterface, getParameterName, invoke, postDeregister, postRegister, preDeregister, preRegister, setAttribute, setAttributes, setImplementation

Methods inherited from class java.lang.Object

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

Constructor Detail

PersistentCacheStats

public PersistentCacheStats(CacheType cacheType,
                            StatisticsProvider provider)

Method Detail

markHit

public void markHit()

markRequest

public void markRequest()

markException

public void markException()

markPut

public void markPut()

markRecvBroadcast

public void markRecvBroadcast()

markInvalidateOne

public void markInvalidateOne()

markInvalidateAll

public void markInvalidateAll()

markPutRejectedAlreadyPersisted

public void markPutRejectedAlreadyPersisted()

markPutRejectedEntryNotUsed

public void markPutRejectedEntryNotUsed()

markPutRejectedAsCachedInSecondary

public void markPutRejectedAsCachedInSecondary()

markPutRejectedQueueFull

public void markPutRejectedQueueFull()

startReadTimer

public TimerStats.Context startReadTimer()

startLoaderTimer

public TimerStats.Context startLoaderTimer()

addWriteGeneration

public void addWriteGeneration(int generation)

removeReadGeneration

public void removeReadGeneration(int generation)

markBytesWritten

public void markBytesWritten(long numBytes)

getName

public String getName()

Specified by:

getName in interface CacheStatsMBean

getRequestCount

public long getRequestCount()

Description copied from interface: CacheStatsMBean

Returns the number of times com.google.common.cache.Cache lookup methods have returned either a cached or uncached value. This is defined as getHitCount + getMissCount.

Specified by:

getRequestCount in interface CacheStatsMBean

getHitCount

public long getHitCount()

Description copied from interface: CacheStatsMBean

Returns the number of times com.google.common.cache.Cache lookup methods have returned a cached value.

Specified by:

getHitCount in interface CacheStatsMBean

getHitRate

public double getHitRate()

Description copied from interface: CacheStatsMBean

Returns the ratio of cache requests which were hits. This is defined as getHitCount / getRequestCount, or 1.0 when getRequestCount == 0. Note that getHitRate + getMissRate =~ 1.0.

Specified by:

getHitRate in interface CacheStatsMBean

getMissCount

public long getMissCount()

Description copied from interface: CacheStatsMBean

Returns the number of times com.google.common.cache.Cache lookup methods have returned an uncached (newly loaded) value, or null. Multiple concurrent calls to com.google.common.cache.Cache lookup methods on an absent value can result in multiple misses, all returning the results of a single cache load operation.

Specified by:

getMissCount in interface CacheStatsMBean

getMissRate

public double getMissRate()

Description copied from interface: CacheStatsMBean

Returns the ratio of cache requests which were misses. This is defined as getMissCount / getRequestCount, or 0.0 when getRequestCount == 0. Note that getHitRate + getMissRate =~ 1.0. Cache misses include all requests which weren't cache hits, including requests which resulted in either successful or failed loading attempts, and requests which waited for other threads to finish loading. It is thus the case that getMissCount >= getLoadSuccessCount + getLoadExceptionCount. Multiple concurrent misses for the same key will result in a single load operation.

Specified by:

getMissRate in interface CacheStatsMBean

getLoadCount

public long getLoadCount()

Description copied from interface: CacheStatsMBean

Returns the total number of times that com.google.common.cache.Cache lookup methods attempted to load new values. This includes both successful load operations, as well as those that threw exceptions. This is defined as getLoadSuccessCount + getLoadExceptionCount.

Specified by:

getLoadCount in interface CacheStatsMBean

getLoadSuccessCount

public long getLoadSuccessCount()

Description copied from interface: CacheStatsMBean

Returns the number of times com.google.common.cache.Cache lookup methods have successfully loaded a new value. This is always incremented in conjunction with CacheStatsMBean.getMissCount(), though getMissCount is also incremented when an exception is encountered during cache loading (see CacheStatsMBean.getLoadExceptionCount()). Multiple concurrent misses for the same key will result in a single load operation.

Specified by:

getLoadSuccessCount in interface CacheStatsMBean

getLoadExceptionCount

public long getLoadExceptionCount()

Description copied from interface: CacheStatsMBean

Returns the number of times com.google.common.cache.Cache lookup methods threw an exception while loading a new value. This is always incremented in conjunction with getMissCount, though getMissCount is also incremented when cache loading completes successfully (see CacheStatsMBean.getLoadSuccessCount()). Multiple concurrent misses for the same key will result in a single load operation.

Specified by:

getLoadExceptionCount in interface CacheStatsMBean

getLoadExceptionRate

public double getLoadExceptionRate()

Description copied from interface: CacheStatsMBean

Returns the ratio of cache loading attempts which threw exceptions. This is defined as getLoadExceptionCount / (getLoadSuccessCount + getLoadExceptionCount), or 0.0 when getLoadSuccessCount + getLoadExceptionCount == 0.

Specified by:

getLoadExceptionRate in interface CacheStatsMBean

estimateCurrentWeight

public long estimateCurrentWeight()

Description copied from interface: CacheStatsMBean

Total weight of the complete cache. Depending on implementation it might be the amount of RAM taken by the cache

Specified by:

estimateCurrentWeight in interface CacheStatsMBean

Returns:

to weight of the cache

getRequestRateHistory

public CompositeData getRequestRateHistory()

Specified by:

getRequestRateHistory in interface PersistentCacheStatsMBean

getHitRateHistory

public CompositeData getHitRateHistory()

Specified by:

getHitRateHistory in interface PersistentCacheStatsMBean

getLoadRateHistory

public CompositeData getLoadRateHistory()

Specified by:

getLoadRateHistory in interface PersistentCacheStatsMBean

getLoadExceptionRateHistory

public CompositeData getLoadExceptionRateHistory()

Specified by:

getLoadExceptionRateHistory in interface PersistentCacheStatsMBean

getHitPercentageHistory

public CompositeData getHitPercentageHistory()

Specified by:

getHitPercentageHistory in interface PersistentCacheStatsMBean

getPutRateHistory

public CompositeData getPutRateHistory()

Specified by:

getPutRateHistory in interface PersistentCacheStatsMBean

getPutRejectedAlreadyPersistedRateHistory

public CompositeData getPutRejectedAlreadyPersistedRateHistory()

Specified by:

getPutRejectedAlreadyPersistedRateHistory in interface PersistentCacheStatsMBean

getPutRejectedEntryNotUsedRateHistory

public CompositeData getPutRejectedEntryNotUsedRateHistory()

Specified by:

getPutRejectedEntryNotUsedRateHistory in interface PersistentCacheStatsMBean

getPutRejectedQueueFullRateHistory

public CompositeData getPutRejectedQueueFullRateHistory()

Specified by:

getPutRejectedQueueFullRateHistory in interface PersistentCacheStatsMBean

getPutRejectedAsCachedInSecRateHistory

public CompositeData getPutRejectedAsCachedInSecRateHistory()

Specified by:

getPutRejectedAsCachedInSecRateHistory in interface PersistentCacheStatsMBean

getInvalidateOneRateHistory

public CompositeData getInvalidateOneRateHistory()

Specified by:

getInvalidateOneRateHistory in interface PersistentCacheStatsMBean

getInvalidateAllRateHistory

public CompositeData getInvalidateAllRateHistory()

Specified by:

getInvalidateAllRateHistory in interface PersistentCacheStatsMBean

getBroadcastRecvRateHistory

public CompositeData getBroadcastRecvRateHistory()

Specified by:

getBroadcastRecvRateHistory in interface PersistentCacheStatsMBean

getUsedSpaceHistory

public CompositeData getUsedSpaceHistory()

Specified by:

getUsedSpaceHistory in interface PersistentCacheStatsMBean

cacheInfoAsString

public String cacheInfoAsString()

Description copied from interface: CacheStatsMBean

Gathers the stats of the cache for logging.

Specified by:

cacheInfoAsString in interface CacheStatsMBean

Specified by:

cacheInfoAsString in interface PersistentCacheStatsMBean

getTotalLoadTime

public long getTotalLoadTime()

Description copied from interface: CacheStatsMBean

Returns the total number of nanoseconds the cache has spent loading new values. This can be used to calculate the miss penalty. This value is increased every time getLoadSuccessCount or getLoadExceptionCount is incremented.

Specified by:

getTotalLoadTime in interface CacheStatsMBean

getAverageLoadPenalty

public double getAverageLoadPenalty()

Description copied from interface: CacheStatsMBean

Returns the average time spent loading new values. This is defined as getTotalLoadTime / (getLoadSuccessCount + getLoadExceptionCount).

Specified by:

getAverageLoadPenalty in interface CacheStatsMBean

getEvictionCount

public long getEvictionCount()

Description copied from interface: CacheStatsMBean

Returns the number of times an entry has been evicted. This count does not include manual com.google.common.cache.Cache#invalidate invalidations.

Specified by:

getEvictionCount in interface CacheStatsMBean

getElementCount

public long getElementCount()

Description copied from interface: CacheStatsMBean

Get the number of elements/objects in the cache.

Specified by:

getElementCount in interface CacheStatsMBean

Returns:

the number of elements

getMaxTotalWeight

public long getMaxTotalWeight()

Description copied from interface: CacheStatsMBean

The maximum weight of entries the cache may contain.

Specified by:

getMaxTotalWeight in interface CacheStatsMBean

Returns:

the maximum total weight of entries the cache may contain

resetStats

public void resetStats()

Description copied from interface: CacheStatsMBean

Reset the cache stats

Specified by:

resetStats in interface CacheStatsMBean