Package org.apache.openjpa.instrumentation

Class AbstractDataCacheInstrument

java.lang.Object

org.apache.openjpa.lib.instrumentation.AbstractInstrument

org.apache.openjpa.instrumentation.AbstractDataCacheInstrument

All Implemented Interfaces:

DataCacheInstrument, Instrument

Direct Known Subclasses:

DataCacheJMXInstrument

public abstract class AbstractDataCacheInstrument
extends AbstractInstrument
implements DataCacheInstrument

Provides a basic instrument implementation wrapper for the data cache. This class can be extended to create a provider specific instrument for the data cache.

Field Summary

Fields

Modifier and Type	Field	Description
static final long	NO_STATS	Value indicating that cache statistics are not available.

Constructor Summary

Constructors

Constructor	Description
AbstractDataCacheInstrument()

Method Summary

Modifier and Type	Method	Description
void	cache(String className, boolean enable)	This method is used to enable/disable caching for the specified className.
void	clear()	Clears all data from the DataCache.
void	collectStatistics(boolean enable)
String	getCacheName()	Returns the name of the cache
Map<String,long[]>	getCacheStatistics()	Returns the CacheStatistics for the cache.
String	getConfigId()
String	getContextRef()
long	getHitCount()	Returns the hit count since cache statistics were last reset
long	getHitCount(String c)	Gets number of total read requests that has been found in cache for the given class since last reset.
InstrumentationLevel	getLevel()	Gets the instrumentation level of this instrument.
long	getReadCount()	Returns the read count since cache statistics were last reset
long	getReadCount(String c)	Gets number of total read requests for the given class since last reset.
Boolean	getStatisticsEnabled()	Returns true if cache statistics are currently being calculated.
long	getTotalHitCount()	Returns the total hits since start.
long	getTotalHitCount(String c)	Gets number of total read requests that has been found in cache for the given class since start.
long	getTotalReadCount()	Returns the total reads since start.
long	getTotalReadCount(String c)	Gets number of total read requests for the given class since start.
long	getTotalWriteCount()	Returns the total writes since start.
long	getTotalWriteCount(String c)	Gets number of total write requests for the given class since start.
long	getWriteCount()	Returns the write count since cache statistics were last reset
long	getWriteCount(String c)	Gets number of total write requests for the given class since last reset.
Map<String,Boolean>	listKnownTypes()	Returns the names of classes that are known to the cache and whether or not they are currently being cached.
void	reset()	Resets cache statistics
void	setConfigId(String cid)
void	setContextRef(String cref)
void	setDataCache(DataCache dc)
void	setDataCacheManager(DataCacheManager dcm)
Date	sinceDate()	Returns date since cache statistics collection were last reset.
Date	startDate()	Returns date cache statistics collection started.

Methods inherited from class org.apache.openjpa.lib.instrumentation.AbstractInstrument

getContext, getName, getOptions, getProvider, initialize, isStarted, restart, setContext, setOptions, setProvider, setStarted

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.openjpa.lib.instrumentation.Instrument

start, stop

Field Details

NO_STATS

public static final long NO_STATS

Value indicating that cache statistics are not available.

See Also:

• Constant Field Values

Constructor Details

AbstractDataCacheInstrument

public AbstractDataCacheInstrument()

Method Details

setDataCache

public void setDataCache(DataCache dc)

setDataCacheManager

public void setDataCacheManager(DataCacheManager dcm)

setConfigId

public void setConfigId(String cid)

setContextRef

public void setContextRef(String cref)

getHitCount

public long getHitCount()

Description copied from interface: DataCacheInstrument

Returns the hit count since cache statistics were last reset

Specified by:

getHitCount in interface DataCacheInstrument

getReadCount

public long getReadCount()

Description copied from interface: DataCacheInstrument

Returns the read count since cache statistics were last reset

Specified by:

getReadCount in interface DataCacheInstrument

getTotalHitCount

public long getTotalHitCount()

Description copied from interface: DataCacheInstrument

Returns the total hits since start.

Specified by:

getTotalHitCount in interface DataCacheInstrument

getTotalReadCount

public long getTotalReadCount()

Description copied from interface: DataCacheInstrument

Returns the total reads since start.

Specified by:

getTotalReadCount in interface DataCacheInstrument

getTotalWriteCount

public long getTotalWriteCount()

Description copied from interface: DataCacheInstrument

Returns the total writes since start.

Specified by:

getTotalWriteCount in interface DataCacheInstrument

getWriteCount

public long getWriteCount()

Description copied from interface: DataCacheInstrument

Returns the write count since cache statistics were last reset

Specified by:

getWriteCount in interface DataCacheInstrument

reset

public void reset()

Description copied from interface: DataCacheInstrument

Resets cache statistics

Specified by:

reset in interface DataCacheInstrument

sinceDate

public Date sinceDate()

Description copied from interface: DataCacheInstrument

Returns date since cache statistics collection were last reset.

Specified by:

sinceDate in interface DataCacheInstrument

startDate

public Date startDate()

Description copied from interface: DataCacheInstrument

Returns date cache statistics collection started.

Specified by:

startDate in interface DataCacheInstrument

getConfigId

public String getConfigId()

getContextRef

public String getContextRef()

getCacheName

public String getCacheName()

Description copied from interface: DataCacheInstrument

Returns the name of the cache

Specified by:

getCacheName in interface DataCacheInstrument

getWriteCount

public long getWriteCount(String c)

Description copied from interface: DataCacheInstrument

Gets number of total write requests for the given class since last reset.

Specified by:

getWriteCount in interface DataCacheInstrument

getTotalWriteCount

public long getTotalWriteCount(String c)

Description copied from interface: DataCacheInstrument

Gets number of total write requests for the given class since start.

Specified by:

getTotalWriteCount in interface DataCacheInstrument

getTotalReadCount

public long getTotalReadCount(String c)

Description copied from interface: DataCacheInstrument

Gets number of total read requests for the given class since start.

Specified by:

getTotalReadCount in interface DataCacheInstrument

getTotalHitCount

public long getTotalHitCount(String c)

Description copied from interface: DataCacheInstrument

Gets number of total read requests that has been found in cache for the given class since start.

Specified by:

getTotalHitCount in interface DataCacheInstrument

getReadCount

public long getReadCount(String c)

Description copied from interface: DataCacheInstrument

Gets number of total read requests for the given class since last reset.

Specified by:

getReadCount in interface DataCacheInstrument

getHitCount

public long getHitCount(String c)

Description copied from interface: DataCacheInstrument

Gets number of total read requests that has been found in cache for the given class since last reset.

Specified by:

getHitCount in interface DataCacheInstrument

getLevel

public InstrumentationLevel getLevel()

Description copied from interface: Instrument

Gets the instrumentation level of this instrument. The instrumentation level determines if and when the instrument will automatically start and stop.

Specified by:

getLevel in interface Instrument

Overrides:

getLevel in class AbstractInstrument

Returns:

the instrumentation level of the instrument

cache

public void cache(String className,
 boolean enable)

Description copied from interface: DataCacheInstrument

This method is used to enable/disable caching for the specified className.

Specified by:

cache in interface DataCacheInstrument

listKnownTypes

public Map<String,Boolean> listKnownTypes()

Description copied from interface: DataCacheInstrument

Returns the names of classes that are known to the cache and whether or not they are currently being cached.

Specified by:

listKnownTypes in interface DataCacheInstrument

collectStatistics

public void collectStatistics(boolean enable)

Specified by:

collectStatistics in interface DataCacheInstrument

Parameters:

enable - - If true, the cache will start collecting statistics. Else cache statistics will not be collected.

getStatisticsEnabled

public Boolean getStatisticsEnabled()

Description copied from interface: DataCacheInstrument

Returns true if cache statistics are currently being calculated. False otherwise.

Specified by:

getStatisticsEnabled in interface DataCacheInstrument

getCacheStatistics

public Map<String,long[]> getCacheStatistics()

Description copied from interface: DataCacheInstrument

Returns the CacheStatistics for the cache. The format for this map is: Type(String) => Enabled(Boolean),Read(Long),Hit(Long),Write(Long)

Specified by:

getCacheStatistics in interface DataCacheInstrument

clear

public void clear()

Description copied from interface: DataCacheInstrument

Clears all data from the DataCache.

Specified by:

clear in interface DataCacheInstrument