Examples of org.eclipse.persistence.sessions.UnitOfWork

Package org.eclipse.persistence.sessions

Examples of org.eclipse.persistence.sessions.UnitOfWork

org.eclipse.persistence.sessions.UnitOfWork
Purpose: To allow object level transactions. This class represents the public API of the unit of work and should be used to maintain complete compatibility.
Description: The unit of work is a session that implements all of the normal protocol of an EclipseLink session. It can be spawned from any other session including another unit of work. Objects can be brought into the unit of work through reading them or through registering them. The unit of work will operate on its own object space, that is the objects within the unit of work will be clones of the original objects. When the unit of work is committed, all changes to any objects registered within the unit of work will be committed to the database. A minimal commit/update will be performed and any foreign keys/circular reference/referential integrity will be resolved. If the commit to the database is successful the changed objects will be merged back into the unit of work parent session.
Responsibilities:
- Allow parallel transactions against a session's objects.
- Allow nested transactions.
- Not require the application to write objects that is changes, automatically determine what has changed.
- Perform a minimal commit/update of all changes that occurred.
- Resolve foreign keys for newly created objects and maintain referential integrity.
- Allow for the object transaction to use its own object space.

     * @see  {@link Operation}
     */
    @Override
    public Object invoke(XRServiceAdapter xrService, Invocation invocation) {
        Object instance = invocation.getParameters().toArray()[0];
        UnitOfWork uow = xrService.getORSession().acquireUnitOfWork();
        // read the existing object into the uow
        uow.readObject(instance);
        // overwrite it
        uow.mergeClone(instance);
        uow.commit();
        return null;
    }

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     * @see  {@link Operation}
     */
    @Override
    public Object invoke(XRServiceAdapter xrService, Invocation invocation) {
        Object instance = invocation.getParameters().toArray()[0];
        UnitOfWork uow = xrService.getORSession().acquireUnitOfWork();
        uow.registerNewObject(instance);
        uow.commit();
        return null;
    }

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     * @see  {@link Operation}
     */
    @Override
    public Object invoke(XRServiceAdapter xrService, Invocation invocation) {
        Object clone = invocation.getParameters().toArray()[0];
        UnitOfWork uow = xrService.getORSession().acquireUnitOfWork();
        Object instance = uow.readObject(clone);
        uow.deleteObject(instance);
        uow.commit();
        return null;
    }

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     * @throws PersistenceException if an unsupported lock call is made
     */
    public void refresh(Object entity, LockModeType lockMode, Map properties) {
        try {
            verifyOpen();
            UnitOfWork uow = getActivePersistenceContext(checkForTransaction(false));
            if (! contains(entity, uow)) {
                throw new IllegalArgumentException(ExceptionLocalization.buildMessage("cant_refresh_not_managed_object", new Object[] { entity }));
            }


            // Get the read object query and apply the properties to it.

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     *   cannot be accessed.
     */
    public <T> T getReference(Class<T> entityClass, Object primaryKey) {
        try {
            verifyOpen();
            UnitOfWork session = (UnitOfWork)getActiveSession();            
            Object reference = session.getReference(entityClass, primaryKey);
            if (reference == null) {
                Object[] args = {primaryKey};
                String message = ExceptionLocalization.buildMessage("no_entities_retrieved_for_get_reference", args);
                throw new javax.persistence.EntityNotFoundException(message);
            }

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    super.beginTransaction(entityManager, definition);
    if (!definition.isReadOnly() && !this.lazyDatabaseTransaction) {
      // This is the magic bit. As with the existing Spring TopLink integration,
      // begin an early transaction to force EclipseLink to get a JDBC Connection
      // so that Spring can manage transactions with JDBC as well as EclipseLink.
      UnitOfWork uow = (UnitOfWork) getSession(entityManager);
      uow.beginEarlyTransaction();
    }
    // Could return the UOW, if there were any advantage in having it later.
    return null;
  }

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    super.beginTransaction(entityManager, definition);
    if (!definition.isReadOnly() && !this.lazyDatabaseTransaction) {
      // This is the magic bit. As with the existing Spring TopLink integration,
      // begin an early transaction to force EclipseLink to get a JDBC Connection
      // so that Spring can manage transactions with JDBC as well as EclipseLink.
      UnitOfWork uow = (UnitOfWork) getSession(entityManager);
      uow.beginEarlyTransaction();
    }
    // Could return the UOW, if there were any advantage in having it later.
    return null;
  }

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     * @param entity instance registered in the current persistence context.
     */
    public void refresh(Object entity) {
        try {
            verifyOpen();
            UnitOfWork uow = getActivePersistenceContext(checkForTransaction(!isExtended()));
            if (!contains(entity, uow)) {
                throw new IllegalArgumentException(ExceptionLocalization.buildMessage("cant_refresh_not_managed_object", new Object[] { entity }));
            }
            ReadObjectQuery query = new ReadObjectQuery();
            query.setSelectionObject(entity);
            query.refreshIdentityMapResult();
            query.cascadeByMapping();
            query.setLockMode(ObjectBuildingQuery.NO_LOCK);
            query.setIsExecutionClone(true);
            Object refreshedEntity = null;
            refreshedEntity = uow.executeQuery(query);
            if (refreshedEntity == null) {
                // bug5955326, ReadObjectQuery will now ensure the object is invalidated if refresh returns null.
                throw new EntityNotFoundException(ExceptionLocalization.buildMessage("entity_no_longer_exists_in_db", new Object[] { entity }));
            }
        } catch (RuntimeException exception) {

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     *   cannot be accessed.
     */
    public <T> T getReference(Class<T> entityClass, Object primaryKey) {
        try {
            verifyOpen();
            UnitOfWork session = (UnitOfWork)getActiveSession();            
            Object reference = session.getReference(entityClass, primaryKey);
            if (reference == null) {
                Object[] args = {primaryKey};
                String message = ExceptionLocalization.buildMessage("no_entities_retrieved_for_get_reference", args);
                throw new javax.persistence.EntityNotFoundException(message);
            }

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        Vector executeArguments = new NonSynchronizedVector();
        for (int i = 0; i < queryArgumentsSize; i++) {
            String argName = (String)queryArguments.get(i);
            executeArguments.add(invocation.getParameter(argName));
        }
        UnitOfWork uow = xrService.getORSession().acquireUnitOfWork();
        Object toBeDeleted = uow.executeQuery(roq, executeArguments);
        if (toBeDeleted != null) {
            uow.deleteObject(toBeDeleted);
            uow.commit();
        }
        return null;
    }

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Related Classes of org.eclipse.persistence.sessions.UnitOfWork

org.eclipse.persistence.internal.jpa.EntityManagerImpl

org.eclipse.persistence.internal.xr.DeleteOperation

org.eclipse.persistence.internal.xr.InsertOperation

org.eclipse.persistence.internal.xr.UpdateOperation

org.eclipse.persistence.jpa.rs.PersistenceContext

org.springframework.orm.jpa.vendor.EclipseLinkJpaDialect

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