com.tangosol.persistence

Class SafePersistenceWrappers.SafePersistenceEnvironment<R,T extends Throwable>

java.lang.Object

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

com.tangosol.persistence.SafePersistenceWrappers.SafePersistenceEnvironment<R,T>

Type Parameters:

R - the type of a raw, environment specific object representation

T - the type of a Throwable failure to protect

All Implemented Interfaces:

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

Enclosing class:

SafePersistenceWrappers

public static class SafePersistenceWrappers.SafePersistenceEnvironment<R,T extends Throwable>
extends NullImplementation.NullPersistenceEnvironment<R>

SafePersistenceEnvironment is a wrapper PersistenceEnvironment implementation which protects all operations on the underlying environment (and any PersistenceManger or PersistentStore instances opened through this environment) from unexpected failures, delegating the exception handling to a failure Continuation.

Field Summary

Fields

Modifier and Type	Field and Description
protected Continuation<? super T>	f_contFailure The failure continuation for this environment.
protected com.oracle.datagrid.persistence.PersistenceEnvironment<R>	f_env The underlying PersistenceEnvironment.
protected SafePersistenceWrappers.FailureContinuationFactory<R,? super T>	f_factoryCont The FailureContinuationFactory.

Fields inherited from class com.tangosol.util.NullImplementation.NullPersistenceEnvironment

INSTANCE

Constructor Summary

Constructors

Constructor and Description
SafePersistenceEnvironment(com.oracle.datagrid.persistence.PersistenceEnvironment<R> env) Construct a PersistenceEnvironment backed by the specified environment.
SafePersistenceEnvironment(com.oracle.datagrid.persistence.PersistenceEnvironment<R> env, Continuation<? super Throwable> cont) Construct a PersistenceEnvironment backed by the specified environment.
SafePersistenceEnvironment(com.oracle.datagrid.persistence.PersistenceEnvironment<R> env, SafePersistenceWrappers.FailureContinuationFactory<R,? super T> factory) Construct a PersistenceEnvironment backed by the specified environment.

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.
com.oracle.datagrid.persistence.PersistenceEnvironment<R>	getEnvironment() Return the underlying PersistenceEnvironment.
String[]	listSnapshots() Return the identifiers of the snapshots known to this environment.
protected void	onException(T t) Called to handle an unexpected exception.
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.
String	toString() Return a human readable description of this SafePersistenceEnvironment.
protected com.oracle.datagrid.persistence.PersistenceManager	wrap(com.oracle.datagrid.persistence.PersistenceManager<R> mgr) Wrap the specified manager in a SafePersistenceManager implementation.

Methods inherited from class java.lang.Object

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

Field Detail

f_env

protected final com.oracle.datagrid.persistence.PersistenceEnvironment<R> f_env

The underlying PersistenceEnvironment.

f_contFailure

protected final Continuation<? super T extends Throwable> f_contFailure

The failure continuation for this environment.

f_factoryCont

protected final SafePersistenceWrappers.FailureContinuationFactory<R,? super T extends Throwable> f_factoryCont

The FailureContinuationFactory.

Constructor Detail

SafePersistenceEnvironment

public SafePersistenceEnvironment(com.oracle.datagrid.persistence.PersistenceEnvironment<R> env)

Construct a PersistenceEnvironment backed by the specified environment.

Parameters:

env - the underlying PersistenceEnvironment

SafePersistenceEnvironment

public SafePersistenceEnvironment(com.oracle.datagrid.persistence.PersistenceEnvironment<R> env,
                                  Continuation<? super Throwable> cont)

Construct a PersistenceEnvironment backed by the specified environment.

Parameters:

env - the underlying PersistenceEnvironment

cont - the failure continuation to use to handle unexpected exceptions

SafePersistenceEnvironment

public SafePersistenceEnvironment(com.oracle.datagrid.persistence.PersistenceEnvironment<R> env,
                                  SafePersistenceWrappers.FailureContinuationFactory<R,? super T> factory)

Construct a PersistenceEnvironment backed by the specified environment.

Parameters:

env - the underlying PersistenceEnvironment

factory - the failure continuation factory to use to create handlers for unexpected exceptions

Method Detail

getEnvironment

public com.oracle.datagrid.persistence.PersistenceEnvironment<R> getEnvironment()

Return the underlying PersistenceEnvironment.

Returns:

the underlying PersistenceEnvironment

onException

protected void onException(T t)

Called to handle an unexpected exception.

Parameters:

t - the Throwable

wrap

protected com.oracle.datagrid.persistence.PersistenceManager wrap(com.oracle.datagrid.persistence.PersistenceManager<R> mgr)

Wrap the specified manager in a SafePersistenceManager implementation.

Parameters:

mgr - the underlying PersistenceManger

Returns:

a "safe" PersistenceManger or null if the specified manager is null

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>

Overrides:

openActive in class NullImplementation.NullPersistenceEnvironment<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>

Overrides:

openSnapshot in class NullImplementation.NullPersistenceEnvironment<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>

Overrides:

createSnapshot in class NullImplementation.NullPersistenceEnvironment<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 or null if the snapshot does not exist

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>

Overrides:

removeSnapshot in class NullImplementation.NullPersistenceEnvironment<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>

Overrides:

listSnapshots in class NullImplementation.NullPersistenceEnvironment<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>

Overrides:

release in class NullImplementation.NullPersistenceEnvironment<R>

toString

public String toString()

Return a human readable description of this SafePersistenceEnvironment.

Overrides:

toString in class Object

Returns:

a human readable description