Examples of org.qi4j.api.unitofwork.UnitOfWork

org.qi4j.api.unitofwork.UnitOfWork
All operations on entities goes through an UnitOfWork.
A UnitOfWork allows you to access Entities and work with them. All modifications to Entities are recorded by the UnitOfWork, and at the end they may be sent to the underlying EntityStore by calling complete(). If the UoW was read-only you may instead simply discard() it.

A UoW differs from a traditional Transaction in the sense that it is not tied at all to the underlying storage resource. Because of this there is no timeout on a UoW. It can be very short or very long. Another difference is that if a call to complete() fails, and the cause is validation errors in the Entities of the UoW, then these can be corrected and the UoW retried. By contrast, when a Transaction commit fails, then the whole transaction has to be done from the beginning again.
A UoW can be associated with a Usecase. A Usecase describes the metainformation about the process to be performed by the UoW.
If a code block that uses a UoW throws an exception you need to ensure that this is handled properly, and that the UoW is closed before returning. Because discard() is a no-op if the UoW is closed, we therefore recommend the following template to be used:
```
 UnitOfWork uow = uowf.newUnitOfWork(); try { ... uow.complete(); } finally { uow.discard(); } 
```
This ensures that in the happy case the UoW is completed, and if any exception is thrown the UoW is discarded. After the UoW has completed the discard() method doesn't do anything, and so has no effect. You can choose to either add catch blocks for any exceptions, including exceptions from complete(), or skip them.


    @Test
    public void givenEntityWithPropertyConstraintsWhenInstantiatedThenPropertiesWork()
        throws Exception
    {
        UnitOfWork unitOfWork = module.newUnitOfWork();
        try
        {
            EntityBuilder<PersonEntity> builder = unitOfWork.newEntityBuilder( PersonEntity.class );
            PersonEntity personEntity = builder.instance();
            personEntity.givenName().set( "Rickard" );
            personEntity.familyName().set( "Öberg" );
            personEntity = builder.newInstance();


            personEntity.givenName().set( "Niclas" );
            personEntity.familyName().set( "Hedhman" );


            unitOfWork.complete();
        }
        finally
        {
            unitOfWork.discard();
        }
    }

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    @Test( expected = ConstraintViolationException.class )
    public void givenEntityWithNonOptionPropertyWhenInstantiatedThenException()
        throws Exception
    {
        UnitOfWork unitOfWork = module.newUnitOfWork();
        try
        {
            PersonEntity person = unitOfWork.newEntity( PersonEntity.class );


            unitOfWork.complete();
        }
        finally
        {
            unitOfWork.discard();
        }
    }

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    @Test
    public void givenEntityIsCreatedAndUnitOfWorkIsNotCompletedWhenEntityIsRemoveThenSuccessfulRemoval()
        throws Exception
    {
        UnitOfWork uow = module.newUnitOfWork();
        EntityBuilder<TestEntity> builder = uow.newEntityBuilder( TestEntity.class, "123" );
        builder.instance().test().set( "habba" );
        TestEntity test = builder.newInstance();
        uow.remove( test );
        uow.complete();
    }

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    @Test
    public void givenStandardPidRegulatorWhenNoChangeInInputExpectOutputToGoTowardsMinimum()
        throws Exception
    {
        UnitOfWork uow = module.newUnitOfWork();
        PidRegulator regulator = null;
        try
        {
            regulator = createPidRegulator( uow );
        }
        finally
        {
            if( regulator != null )
            {
                uow.remove( regulator );
            }
            // TODO: This problem is related to that uow.remove() has a bug.
            // If the Entity is both created and removed in the same session, then the remove() should simply remove
            // the entity from the internal UoW holding area, and not set the REMOVED status.


            // Probably that UnitOfWorkInstance.remove() should also call instanceCache.remove(), but the question is
            // then what is an InstanceKey vs EntityReference
            uow.complete();
        }
    }

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    }


    @Test
    public void entityBuilderAssociationTypeIsNotNull()
    {
        UnitOfWork uow = module.newUnitOfWork();
        try
        {
            EntityBuilder<Item> builder = uow.newEntityBuilder( Item.class );
            assertEquals( ItemType.class, qi4j.api().getEntityDescriptor( builder.instance()).state().getAssociationByName( "typeOfItem" ).type() );
        }
        finally
        {
            uow.discard();
        }
    }

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    }


    @Test
    public final void testImmutableEntityProperty()
    {
        UnitOfWork uow = module.newUnitOfWork();
        try
        {
            EntityBuilder<LocationEntity> builder = uow.newEntityBuilder( LocationEntity.class );
            builder.instance().name().set( "Rickard" );
            Location location = builder.newInstance();


            try
            {
                location.name().set( "Niclas" );
                Assert.fail( "Should be immutable" );
            }
            catch( IllegalStateException e )
            {
                // Ok
            }
        }
        finally
        {
            uow.discard();
        }
    }

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    @Test
    public void givenEntityInOneUnitOfWorkWhenCurrentUnitOfWorkHasChangedThenUnitOfWorkInjectionInEntityPointsToCorrectUow()
        throws Exception
    {
        Usecase usecase = UsecaseBuilder.newUsecase( "usecase1" );
        UnitOfWork uow = module.newUnitOfWork( usecase );
        try
        {
            Trial trial = uow.newEntity( Trial.class, "123" );
            trial.doSomething();
            uow.complete();
            uow = module.newUnitOfWork( usecase );
            usecase = UsecaseBuilder.newUsecase( "usecase2" );
            UnitOfWork uow2 = module.newUnitOfWork( usecase );
            trial = uow.get( trial );
            trial.doSomething();
            assertEquals( "123", ( (EntityComposite) trial ).identity().get() );
            assertEquals( "usecase1", trial.usecaseName() );
            uow2.discard();
        }
        catch( Throwable ex )
        {
            ex.printStackTrace();
        }

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    @Test( expected = ConstraintViolationException.class )
    public void givenEntityWithNonOptionPropertyWhenInstantiatedThenException()
        throws Exception
    {
        UnitOfWork unitOfWork = module.newUnitOfWork();
        try
        {
            PersonEntity person = unitOfWork.newEntity( PersonEntity.class );


            unitOfWork.complete();
        }
        finally
        {
            unitOfWork.discard();
        }
    }

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    @Test
    public void testThatServiceAndStructureInjectionWorkForValueWhenEntityRetrievedFromStore()
        throws Exception
    {
        UnitOfWork uow = null;
        try
        {
            ValueBuilder<Some> builder = module.newValueBuilder( Some.class );
            builder.prototype().data().set( "Niclas" );
            Some value = builder.newInstance();


            uow = module.newUnitOfWork();
            EntityBuilder<Niclas> eb = uow.newEntityBuilder( Niclas.class );
            eb.instance().value().set( value );
            Niclas niclas1 = eb.newInstance();
            String id = niclas1.identity().get();
            uow.complete();


            uow = module.newUnitOfWork();
            Niclas niclas2 = uow.get( Niclas.class, id );
            Some someValue = niclas2.value().get();
            Assert.assertEquals( someValue.data().get(), "Niclas" );
            Assert.assertNotNull( someValue.module() );
            Assert.assertNotNull( someValue.service() );
        }
        finally
        {
            if( uow != null )
            {
                uow.discard();
            }
        }
    }

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    @Test
    public void testAssemblyMixinsEntity()
        throws UnitOfWorkCompletionException
    {
        UnitOfWork uow = module.newUnitOfWork();
        FooEntity entity = uow.newEntity( FooEntity.class, "123" );
        uow.complete();


        uow = module.newUnitOfWork();
        Foo foo = uow.get( Foo.class, "123" );


        try
        {
            assertThat( "Custom mixin has executed", foo.test( "Foo", 42 ), equalTo( "Foo 42" ) );
        }
        finally
        {
            uow.discard();
        }
    }

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