org.axonframework.repository

Class GenericJpaRepository<T extends AggregateRoot>

java.lang.Object

org.axonframework.repository.AbstractRepository<T>

org.axonframework.repository.LockingRepository<T>

org.axonframework.repository.GenericJpaRepository<T>

Type Parameters:

T - The type of aggregate the repository provides access to

All Implemented Interfaces:

Repository<T>

Direct Known Subclasses:

HybridJpaRepository

public class GenericJpaRepository<T extends AggregateRoot>
extends LockingRepository<T>

Generic repository implementation that stores JPA annotated aggregates. These aggregates must implement AggregateRoot and have the proper JPA Annotations.

Optionally, the repository may be configured with a locking scheme. The repository will always force optimistic locking in the backing data store. The optional lock in the repository is in addition to this optimistic lock. Note that locks on this repository will not be shared with other repository instances.

When this repository is requested to persist changes to an aggregate, it will also flush the EntityManager, to enforce checking of database constraints and optimistic locks.

Since:

0.7

Author:

Allard Buijze

Constructor Summary

Constructors

Constructor and Description
GenericJpaRepository(EntityManagerProvider entityManagerProvider, Class<T> aggregateType) Initialize a repository for storing aggregates of the given aggregateType.
GenericJpaRepository(EntityManagerProvider entityManagerProvider, Class<T> aggregateType, LockManager lockManager) Initialize a repository for storing aggregates of the given aggregateType with an additional lockManager.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	doDeleteWithLock(T aggregate) Perform the actual deleting of the aggregate.
protected T	doLoad(Object aggregateIdentifier, Long expectedVersion) Perform the actual loading of an aggregate.
protected void	doSaveWithLock(T aggregate) Perform the actual saving of the aggregate.
void	setForceFlushOnSave(boolean forceFlushOnSave) Indicates whether the EntityManager's state should be flushed each time an aggregate is saved.

Methods inherited from class org.axonframework.repository.LockingRepository

add, doDelete, doSave, load

Methods inherited from class org.axonframework.repository.AbstractRepository

getAggregateType, load, postDelete, postSave, setEventBus, validateOnLoad

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericJpaRepository

public GenericJpaRepository(EntityManagerProvider entityManagerProvider,
                    Class<T> aggregateType)

Initialize a repository for storing aggregates of the given aggregateType. No additional locking will be used.

Parameters:

entityManagerProvider - The EntityManagerProvider providing the EntityManager instance for this EventStore

aggregateType - the aggregate type this repository manages

GenericJpaRepository

public GenericJpaRepository(EntityManagerProvider entityManagerProvider,
                    Class<T> aggregateType,
                    LockManager lockManager)

Initialize a repository for storing aggregates of the given aggregateType with an additional lockManager.

Parameters:

entityManagerProvider - The EntityManagerProvider providing the EntityManager instance for this repository

aggregateType - the aggregate type this repository manages

lockManager - the additional locking strategy for this repository

Method Detail

doSaveWithLock

protected void doSaveWithLock(T aggregate)

Description copied from class: LockingRepository

Perform the actual saving of the aggregate. All necessary locks have been verified.

Specified by:

doSaveWithLock in class LockingRepository<T extends AggregateRoot>

Parameters:

aggregate - the aggregate to store

doDeleteWithLock

protected void doDeleteWithLock(T aggregate)

Description copied from class: LockingRepository

Perform the actual deleting of the aggregate. All necessary locks have been verified.

Specified by:

doDeleteWithLock in class LockingRepository<T extends AggregateRoot>

Parameters:

aggregate - the aggregate to delete

doLoad

protected T doLoad(Object aggregateIdentifier,
       Long expectedVersion)

Description copied from class: LockingRepository

Perform the actual loading of an aggregate. The necessary locks have been obtained.

Specified by:

doLoad in class LockingRepository<T extends AggregateRoot>

Parameters:

aggregateIdentifier - the identifier of the aggregate to load

expectedVersion - The expected version of the aggregate

Returns:

the fully initialized aggregate

setForceFlushOnSave

public void setForceFlushOnSave(boolean forceFlushOnSave)

Indicates whether the EntityManager's state should be flushed each time an aggregate is saved. Defaults to true.

Flushing the EntityManager will force JPA to send state changes to the database. Any key violations and failing optimistic locks will be identified in an early stage.

Parameters:

forceFlushOnSave - whether or not to flush the EntityManager after each save. Defaults to true.

See Also:

EntityManager.flush()