Package org.apache.openjpa.datacache

Class DataCacheManagerImpl

java.lang.Object

org.apache.openjpa.datacache.DataCacheManagerImpl

All Implemented Interfaces:

DataCacheManager, Closeable

public class DataCacheManagerImpl
extends Object
implements Closeable, DataCacheManager

Default data cache manager provides handle to utilities PCDataGenerator, ClearableScheduler and CacheDistributionPolicy for the cache operation. This implementation also determines whether a managed type is eligible to cache.

Author:

Abe White, Patrick Linskey, Pinaki Poddar

Constructor Summary

Constructors

Constructor	Description
DataCacheManagerImpl()

Method Summary

Modifier and Type	Method	Description
void	close()	Close all caches.
ClearableScheduler	getClearableScheduler()	Return the runnable which schedules evictions.
DataCache	getDataCache(String name)	Return the named data cache, or null if it does not exist.
DataCache	getDataCache(String name, boolean create)	Returns the named cache.
CacheDistributionPolicy	getDistributionPolicy()	Gets the instance-based cache distribution policy, if configured.
DataCachePCDataGenerator	getPCDataGenerator()	Return the PCData generator if configured.
DataCache	getSystemDataCache()	Return the system-wide data cache, or null if caching is not enabled.
QueryCache	getSystemQueryCache()	Return the system query cache, or null if not configured.
void	initialize(OpenJPAConfiguration conf, ObjectValue dataCache, ObjectValue queryCache)	Initialize the manager, supplying the cache configuration.
boolean	isCachable(ClassMetaData meta)	Affirms if the given type is eligible for cache.
Map<String,Boolean>	listKnownTypes()	Returns the names of classes that are known to the cache and whether or not they are currently being cached.
DataCache	selectCache(OpenJPAStateManager sm)	Select cache for the given managed instance.
void	setTypes(Set<String> includedTypes, Set<String> excludedTypes)
void	startCaching(String cls)	Start caching the type matching the provided class name.
void	stopCaching(String cls)	Stop caching the type matching the provided class name.

Methods inherited from class java.lang.Object

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

Constructor Details

DataCacheManagerImpl

public DataCacheManagerImpl()

Method Details

initialize

public void initialize(OpenJPAConfiguration conf,
 ObjectValue dataCache,
 ObjectValue queryCache)

Description copied from interface: DataCacheManager

Initialize the manager, supplying the cache configuration.

Specified by:

initialize in interface DataCacheManager

getSystemDataCache

public DataCache getSystemDataCache()

Description copied from interface: DataCacheManager

Return the system-wide data cache, or null if caching is not enabled.

Specified by:

getSystemDataCache in interface DataCacheManager

getDataCache

public DataCache getDataCache(String name)

Description copied from interface: DataCacheManager

Return the named data cache, or null if it does not exist.

Specified by:

getDataCache in interface DataCacheManager

getDataCache

public DataCache getDataCache(String name,
 boolean create)

Returns the named cache. If the given name is name or the name of the cache plugin then returns the main cache. Otherwise, delegates to the main cache to obtain a partition.

Specified by:

getDataCache in interface DataCacheManager

create - if true, the cache will be created if it does not already exist

getSystemQueryCache

public QueryCache getSystemQueryCache()

Description copied from interface: DataCacheManager

Return the system query cache, or null if not configured.

Specified by:

getSystemQueryCache in interface DataCacheManager

getPCDataGenerator

public DataCachePCDataGenerator getPCDataGenerator()

Description copied from interface: DataCacheManager

Return the PCData generator if configured.

Specified by:

getPCDataGenerator in interface DataCacheManager

getClearableScheduler

public ClearableScheduler getClearableScheduler()

Description copied from interface: DataCacheManager

Return the runnable which schedules evictions.

Specified by:

getClearableScheduler in interface DataCacheManager

close

public void close()

Description copied from interface: DataCacheManager

Close all caches.

Specified by:

close in interface Closeable

Specified by:

close in interface DataCacheManager

selectCache

public DataCache selectCache(OpenJPAStateManager sm)

Select cache for the given managed instance. If type based verification affirms the type to be cached then the instance based policy is called to determine the target cache.

Specified by:

selectCache in interface DataCacheManager

Parameters:

sm - the managed proxy instance

Returns:

the cache that will store the state of the given managed instance.

getDistributionPolicy

public CacheDistributionPolicy getDistributionPolicy()

Gets the instance-based cache distribution policy, if configured.

Specified by:

getDistributionPolicy in interface DataCacheManager

isCachable

public boolean isCachable(ClassMetaData meta)

Affirms if the given type is eligible for cache.

setTypes

public void setTypes(Set<String> includedTypes,
 Set<String> excludedTypes)

startCaching

public void startCaching(String cls)

Description copied from interface: DataCacheManager

Start caching the type matching the provided class name.

Specified by:

startCaching in interface DataCacheManager

stopCaching

public void stopCaching(String cls)

Description copied from interface: DataCacheManager

Stop caching the type matching the provided class name.

Specified by:

stopCaching in interface DataCacheManager

listKnownTypes

public Map<String,Boolean> listKnownTypes()

Description copied from interface: DataCacheManager

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 DataCacheManager