Package org.apache.openjpa.datacache

Interface DataCacheManager

All Known Implementing Classes:

DataCacheManagerImpl

public interface DataCacheManager

Manages the system's data and query caches. You can retrieve the data cache manager from the OpenJPAConfiguration.getDataCacheManagerInstance().
Manages zero or more individual caches or partitions. Each individual partition is identified by a string-based identifier. Decides eligibility to cache for managed types.

Author:

Abe White, Patrick Linskey, Pinaki Poddar

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)	Return the named data cache.
CacheDistributionPolicy	getDistributionPolicy()	Return the user-specific policy that suggests the cache where a managed entity state is stored.
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.
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 the cache where the given managed proxy instance should be cached.
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.

Method Details

initialize

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

Initialize the manager, supplying the cache configuration.

getSystemDataCache

DataCache getSystemDataCache()

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

getDataCache

DataCache getDataCache(String name)

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

getDataCache

DataCache getDataCache(String name,
 boolean create)

Return the named data cache. If the given name is null, the default data cache is returned.

Parameters:

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

getSystemQueryCache

QueryCache getSystemQueryCache()

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

getPCDataGenerator

DataCachePCDataGenerator getPCDataGenerator()

Return the PCData generator if configured.

getClearableScheduler

ClearableScheduler getClearableScheduler()

Return the runnable which schedules evictions.

selectCache

DataCache selectCache(OpenJPAStateManager sm)

Select the cache where the given managed proxy instance should be cached. This decision may override the cache returned by policy as specified by the user.

Parameters:

sm - the managed proxy instance

Returns:

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

Since:

2.0.0

getDistributionPolicy

CacheDistributionPolicy getDistributionPolicy()

Return the user-specific policy that suggests the cache where a managed entity state is stored.

Since:

2.0.0

close

void close()

Close all caches.

stopCaching

void stopCaching(String cls)

Stop caching the type matching the provided class name.

startCaching

void startCaching(String cls)

Start caching the type matching the provided class name.

listKnownTypes

Map<String,Boolean> listKnownTypes()

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