org.axonframework.saga.repository.jpa
Class JpaSagaRepository

java.lang.Object
  org.axonframework.saga.repository.AbstractSagaRepository
      org.axonframework.saga.repository.jpa.JpaSagaRepository

All Implemented Interfaces:

SagaRepository

public class JpaSagaRepository
extends AbstractSagaRepository

JPA implementation of the Saga Repository. It uses an EntityManager to persist the actual saga in a backing store.

After each operations that modified the backing store, EntityManager.flush() is invoked to ensure the store contains the last modifications. To override this behavior, see

Since:

0.7

Author:

Allard Buijze

Constructor Summary

JpaSagaRepository(EntityManagerProvider entityManagerProvider)
Initializes a Saga Repository with a JavaSerializer.

Method Summary

protected void	deleteSaga(Saga saga) Remove the given saga as well as all known association values pointing to it from the repository.
protected Set<String>	findAssociatedSagaIdentifiers(Class<? extends Saga> type, AssociationValue associationValue) Finds the identifiers of the sagas of given type associated with the given associationValue.
Saga	load(String sagaId) Loads a known Saga instance by its unique identifier.
protected void	removeAssociationValue(AssociationValue associationValue, String sagaType, String sagaIdentifier) Removes the association value that has been associated with Saga, identified with the given sagaIdentifier.
void	setResourceInjector(ResourceInjector resourceInjector) Sets the ResourceInjector to use to inject Saga instances with any (temporary) resources they might need.
void	setSerializer(Serializer serializer) Sets the Serializer instance to serialize Sagas with.
void	setUseExplicitFlush(boolean useExplicitFlush) Sets whether or not to do an explicit EntityManager.flush() after each data modifying operation on the backing storage.
protected void	storeAssociationValue(AssociationValue associationValue, String sagaType, String sagaIdentifier) Store the given associationValue, which has been associated with given sagaIdentifier.
protected void	storeSaga(Saga saga) Stores a newly created Saga instance.
protected String	typeOf(Class<? extends Saga> sagaClass) Returns the type identifier to use for the given sagaClass.
protected void	updateSaga(Saga saga) Update a stored Saga, by replacing it with the given saga instance.

Methods inherited from class org.axonframework.saga.repository.AbstractSagaRepository

add, commit, find

Methods inherited from class java.lang.Object

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

Constructor Detail

JpaSagaRepository

public JpaSagaRepository(EntityManagerProvider entityManagerProvider)

Initializes a Saga Repository with a JavaSerializer.

Parameters:

entityManagerProvider - The EntityManagerProvider providing the EntityManager instance for this repository

Method Detail

load

public Saga load(String sagaId)

Description copied from interface: SagaRepository

Loads a known Saga instance by its unique identifier. Returned Sagas must be committed after processing. Due to the concurrent nature of Sagas, it is not unlikely for a Saga to have ceased to exist after it has been found based on associations. Therefore, a repository should return null in case a Saga doesn't exists, as opposed to throwing an exception.

Parameters:

sagaId - The unique identifier of the Saga to load

Returns:

The Saga instance, or null if no such saga exists

removeAssociationValue

protected void removeAssociationValue(AssociationValue associationValue,
                                      String sagaType,
                                      String sagaIdentifier)

Description copied from class: AbstractSagaRepository

Removes the association value that has been associated with Saga, identified with the given sagaIdentifier.

Specified by:

removeAssociationValue in class AbstractSagaRepository

Parameters:

associationValue - The value to remove as association value for the given saga

sagaType - The type of the Saga to remove the association from

sagaIdentifier - The identifier of the Saga to remove the association from

typeOf

protected String typeOf(Class<? extends Saga> sagaClass)

Description copied from class: AbstractSagaRepository

Returns the type identifier to use for the given sagaClass. This information is typically provided by the Serializer, if the repository stores serialized instances.

Specified by:

typeOf in class AbstractSagaRepository

Parameters:

sagaClass - The type of saga to get the type identifier for.

Returns:

The type identifier to use for the given sagaClass

storeAssociationValue

protected void storeAssociationValue(AssociationValue associationValue,
                                     String sagaType,
                                     String sagaIdentifier)

Description copied from class: AbstractSagaRepository

Store the given associationValue, which has been associated with given sagaIdentifier.

Specified by:

storeAssociationValue in class AbstractSagaRepository

Parameters:

associationValue - The association value to store

sagaType - Type type of saga the association value belongs to

sagaIdentifier - The saga related to the association value

findAssociatedSagaIdentifiers

protected Set<String> findAssociatedSagaIdentifiers(Class<? extends Saga> type,
                                                    AssociationValue associationValue)

Description copied from class: AbstractSagaRepository

Finds the identifiers of the sagas of given type associated with the given associationValue.

Specified by:

findAssociatedSagaIdentifiers in class AbstractSagaRepository

Parameters:

type - The type of saga to find identifiers for

associationValue - The value the saga must be associated with

Returns:

The identifiers of sagas associated with the given associationValue

deleteSaga

protected void deleteSaga(Saga saga)

Description copied from class: AbstractSagaRepository

Remove the given saga as well as all known association values pointing to it from the repository. If no such saga exists, nothing happens.

Specified by:

deleteSaga in class AbstractSagaRepository

Parameters:

saga - The saga instance to remove from the repository

updateSaga

protected void updateSaga(Saga saga)

Description copied from class: AbstractSagaRepository

Update a stored Saga, by replacing it with the given saga instance.

Specified by:

updateSaga in class AbstractSagaRepository

Parameters:

saga - The saga that has been modified and needs to be updated in the storage

storeSaga

protected void storeSaga(Saga saga)

Description copied from class: AbstractSagaRepository

Stores a newly created Saga instance.

Specified by:

storeSaga in class AbstractSagaRepository

Parameters:

saga - The newly created Saga instance to store.

setResourceInjector

public void setResourceInjector(ResourceInjector resourceInjector)

Sets the ResourceInjector to use to inject Saga instances with any (temporary) resources they might need. These are typically the resources that could not be persisted with the Saga.

Parameters:

resourceInjector - The resource injector

setSerializer

public void setSerializer(Serializer serializer)

Sets the Serializer instance to serialize Sagas with. Defaults to the XStream Serializer.

Parameters:

serializer - the Serializer instance to serialize Sagas with

setUseExplicitFlush

public void setUseExplicitFlush(boolean useExplicitFlush)

Sets whether or not to do an explicit EntityManager.flush() after each data modifying operation on the backing storage. Default to true

Parameters:

useExplicitFlush - true to force flush, false otherwise.