com.tangosol.util

Class NullImplementation.NullPersistenceEnvironment<R>

java.lang.Object

com.tangosol.util.NullImplementation.NullPersistenceEnvironment<R>

Type Parameters:

R - the raw value type

All Implemented Interfaces:

com.oracle.datagrid.persistence.PersistenceEnvironment<R>

Direct Known Subclasses:

SafePersistenceWrappers.SafePersistenceEnvironment

Enclosing class:

NullImplementation

public static class NullImplementation.NullPersistenceEnvironment<R>
extends Object
implements com.oracle.datagrid.persistence.PersistenceEnvironment<R>

A PersistenceEnvironment that does nothing.

Field Summary

Fields

Modifier and Type	Field and Description
static NullImplementation.NullPersistenceEnvironment	INSTANCE Singleton instance of a NullPersistenceEnvironment.

Constructor Summary

Constructors

Constructor and Description
NullPersistenceEnvironment()

Method Summary

Modifier and Type	Method and Description
com.oracle.datagrid.persistence.PersistenceManager<R>	createSnapshot(String sSnapshot, com.oracle.datagrid.persistence.PersistenceManager<R> manager) Create a PersistenceManager used to manage the snapshot with the specified identifier.
String[]	listSnapshots() Return the identifiers of the snapshots known to this environment.
com.oracle.datagrid.persistence.PersistenceManager<R>	openActive() Open and return the singleton active PersistenceManager.
com.oracle.datagrid.persistence.PersistenceManager<R>	openSnapshot(String sSnapshot) Open a PersistenceManager used to access the snapshot with the specified identifier.
void	release() Release all resources held by this environment.
boolean	removeSnapshot(String sSnapshot) Remove the persistent artifacts associated with the snapshot with the specified identifier.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.oracle.datagrid.persistence.PersistenceEnvironment

createSnapshot

Field Detail

INSTANCE

public static final NullImplementation.NullPersistenceEnvironment INSTANCE

Singleton instance of a NullPersistenceEnvironment.

Constructor Detail

NullPersistenceEnvironment

public NullPersistenceEnvironment()

Method Detail

openActive

public com.oracle.datagrid.persistence.PersistenceManager<R> openActive()

Open and return the singleton active PersistenceManager.

Specified by:

openActive in interface com.oracle.datagrid.persistence.PersistenceEnvironment<R>

Returns:

the singleton active PersistenceManager or null if an active PersistenceManager has not been configured

openSnapshot

public com.oracle.datagrid.persistence.PersistenceManager<R> openSnapshot(String sSnapshot)

Open a PersistenceManager used to access the snapshot with the specified identifier.

Specified by:

openSnapshot in interface com.oracle.datagrid.persistence.PersistenceEnvironment<R>

Parameters:

sSnapshot - the snapshot identifier

Returns:

a PersistenceManager representing the snapshot

createSnapshot

public com.oracle.datagrid.persistence.PersistenceManager<R> createSnapshot(String sSnapshot,
                                                                            com.oracle.datagrid.persistence.PersistenceManager<R> manager)

Create a PersistenceManager used to manage the snapshot with the specified identifier.

Specified by:

createSnapshot in interface com.oracle.datagrid.persistence.PersistenceEnvironment<R>

Parameters:

sSnapshot - the snapshot identifier

manager - the optional PersistenceManager to create a snapshot of; if null, an empty snapshot will be created

Returns:

a PersistenceManager representing the snapshot

removeSnapshot

public boolean removeSnapshot(String sSnapshot)

Remove the persistent artifacts associated with the snapshot with the specified identifier.

Specified by:

removeSnapshot in interface com.oracle.datagrid.persistence.PersistenceEnvironment<R>

Parameters:

sSnapshot - the snapshot identifier

Returns:

true if the snapshot was successfully deleted, false otherwise

listSnapshots

public String[] listSnapshots()

Return the identifiers of the snapshots known to this environment.

Specified by:

listSnapshots in interface com.oracle.datagrid.persistence.PersistenceEnvironment<R>

Returns:

a list of the known snapshot identifiers

release

public void release()

Release all resources held by this environment. Note that the behavior of all other methods on this environment is undefined after this method is called.

Specified by:

release in interface com.oracle.datagrid.persistence.PersistenceEnvironment<R>