org.infinispan.persistence.jpa

Class JpaStore

java.lang.Object

org.infinispan.persistence.jpa.JpaStore

All Implemented Interfaces:

Lifecycle, AdvancedCacheLoader, AdvancedCacheWriter, AdvancedLoadWriteStore, CacheLoader, CacheWriter, ExternalStore

public class JpaStore
extends Object
implements AdvancedLoadWriteStore

Author:

Ray Tsang

Nested Class Summary

Nested classes/interfaces inherited from interface org.infinispan.persistence.spi.AdvancedCacheLoader

AdvancedCacheLoader.CacheLoaderTask<K,V>, AdvancedCacheLoader.TaskContext

Nested classes/interfaces inherited from interface org.infinispan.persistence.spi.AdvancedCacheWriter

AdvancedCacheWriter.PurgeListener<K>

Constructor Summary

Constructors

Constructor and Description
JpaStore()

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all the data from the storage.
boolean	contains(Object key) Returns true if the storage contains an entry associated with the given key.
boolean	delete(Object key)
void	init(InitializationContext ctx) Used to initialize a cache loader.
protected boolean	isValidKeyType(Object key)
MarshalledEntry	load(Object key) Fetches an entry from the storage.
void	process(KeyFilter filter, AdvancedCacheLoader.CacheLoaderTask task, Executor executor, boolean fetchValue, boolean fetchMetadata) Iterates in parallel over the entries in the storage using the threads from the executor pool.
void	purge(Executor threadPool, AdvancedCacheWriter.PurgeListener listener) Using the thread in the pool, removed all the expired data from the persistence storage.
int	size() Returns the number of elements in the store.
void	start() Invoked on component start
void	stop() Invoked on component stop
void	write(MarshalledEntry entry) Persists the entry to the storage.

Methods inherited from class java.lang.Object

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

Constructor Detail

JpaStore

public JpaStore()

Method Detail

init

public void init(InitializationContext ctx)

Description copied from interface: CacheLoader

Used to initialize a cache loader. Typically invoked by the PersistenceManager when setting up cache loaders.

Specified by:

init in interface CacheLoader

Specified by:

init in interface CacheWriter

start

public void start()

Description copied from interface: Lifecycle

Invoked on component start

Specified by:

start in interface Lifecycle

stop

public void stop()

Description copied from interface: Lifecycle

Invoked on component stop

Specified by:

stop in interface Lifecycle

isValidKeyType

protected boolean isValidKeyType(Object key)

clear

public void clear()

Description copied from interface: AdvancedCacheWriter

Removes all the data from the storage.

Specified by:

clear in interface AdvancedCacheWriter

delete

public boolean delete(Object key)

Specified by:

delete in interface CacheWriter

Returns:

true if the entry existed in the persistent store and it was deleted.

write

public void write(MarshalledEntry entry)

Description copied from interface: CacheWriter

Persists the entry to the storage.

Specified by:

write in interface CacheWriter

See Also:

MarshalledEntry

contains

public boolean contains(Object key)

Description copied from interface: CacheLoader

Returns true if the storage contains an entry associated with the given key.

Specified by:

contains in interface CacheLoader

load

public MarshalledEntry load(Object key)

Description copied from interface: CacheLoader

Fetches an entry from the storage. If a MarshalledEntry needs to be created here, InitializationContext.getMarshalledEntryFactory() and InitializationContext.getByteBufferFactory() should be used.

Specified by:

load in interface CacheLoader

Returns:

the entry, or null if the entry does not exist

process

public void process(KeyFilter filter,
                    AdvancedCacheLoader.CacheLoaderTask task,
                    Executor executor,
                    boolean fetchValue,
                    boolean fetchMetadata)

Description copied from interface: AdvancedCacheLoader

Iterates in parallel over the entries in the storage using the threads from the executor pool. For each entry the CacheLoaderTask#processEntry(MarshalledEntry, TaskContext) is invoked. Before passing an entry to the callback task, the entry should be validated against the filter. Implementors should build an AdvancedCacheLoader.TaskContext instance (implementation) that is fed to the AdvancedCacheLoader.CacheLoaderTask on every invocation. The AdvancedCacheLoader.CacheLoaderTask might invoke AdvancedCacheLoader.TaskContext.stop() at any time, so implementors of this method should verify TaskContext's state for early termination of iteration. The method should only return once the iteration is complete or as soon as possible in the case TaskContext.stop() is invoked.

Specified by:

process in interface AdvancedCacheLoader

Parameters:

filter - to validate which entries should be feed into the task. Might be null.

task - callback to be invoked in parallel for each stored entry that passes the filter check

executor - an external thread pool to be used for parallel iteration

fetchValue - whether or not to fetch the value from the persistent store. E.g. if the iteration is intended only over the key set, no point fetching the values from the persistent store as well

fetchMetadata - whether or not to fetch the metadata from the persistent store. E.g. if the iteration is intended only ove the key set, then no pint fetching the metadata from the persistent store as well

size

public int size()

Description copied from interface: AdvancedCacheLoader

Returns the number of elements in the store.

Specified by:

size in interface AdvancedCacheLoader

purge

public void purge(Executor threadPool,
                  AdvancedCacheWriter.PurgeListener listener)

Description copied from interface: AdvancedCacheWriter

Using the thread in the pool, removed all the expired data from the persistence storage. For each removed entry, the supplied listener is invoked.

When this method returns all entries will be purged and no tasks will be running due to this loader in the provided executor. If however an exception is thrown there could be tasks still pending or running in the executor.

Specified by:

purge in interface AdvancedCacheWriter