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.

    private Voyage V200T;
    private Voyage V300A;


    @Before
    public void beforeEachTest() throws Exception {
        UnitOfWork uow = module.currentUnitOfWork();
        CARGOS = uow.get(Cargos.class,  CargosEntity.CARGOS_ID );
        HONGKONG = uow.get( Location.class, CNHKG.code().get() );
        STOCKHOLM = uow.get( Location.class, SESTO.code().get() );
        NEWYORK = uow.get( Location.class, USNYC.code().get() );
        DALLAS = uow.get( Location.class, USDAL.code().get() );
        V100S = uow.get( Voyage.class, "V100S" );
        V200T = uow.get( Voyage.class, "V200T" );
        V300A = uow.get( Voyage.class, "V300A" );
        trackingId = new BookNewCargo( CARGOS, HONGKONG, STOCKHOLM, day( 17 ) ).createCargo( "ABC" );
        cargo = uow.get( Cargo.class, trackingId.id().get() );
        Itinerary itinerary = itinerary(
              leg( V100S, HONGKONG, NEWYORK, day( 1 ), day( 8 ) ),
              leg( V200T, NEWYORK, DALLAS, day( 9 ), day( 12 ) ),
              leg( V300A, DALLAS, STOCKHOLM, day( 13 ),
                   arrival = day( 16 ) )

View Full Code Here

    }


    @Test( expected = RouteException.class )
    public void deviation2a_OriginAndDestinationSame() throws Exception
    {
        UnitOfWork uow = module.currentUnitOfWork();
        Location HONGKONG = uow.get( Location.class, CNHKG.code().get() );
        Cargos CARGOS = uow.get( Cargos.class, CargosEntity.CARGOS_ID );
        new BookNewCargo( CARGOS, HONGKONG, HONGKONG, day( 17 ) ).book();
    }

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    }


    @Test( expected = RouteException.class )
    public void deviation_2b_1_DeadlineInThePastNotAccepted() throws Exception
    {
        UnitOfWork uow = module.currentUnitOfWork();
        Location HONGKONG = uow.get( Location.class, CNHKG.code().get() );
        Location STOCKHOLM = uow.get( Location.class, SESTO.code().get() );
        Cargos CARGOS = uow.get( Cargos.class, CargosEntity.CARGOS_ID );
        new BookNewCargo( CARGOS, HONGKONG, STOCKHOLM, day( -1 ) ).book();
    }

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    }


    @Test( expected = RouteException.class )
    public void deviation_2b_2_DeadlineTodayIsTooEarly() throws Exception
    {
        UnitOfWork uow = module.currentUnitOfWork();
        Location HONGKONG = uow.get( Location.class, CNHKG.code().get() );
        Location STOCKHOLM = uow.get( Location.class, SESTO.code().get() );
        Cargos CARGOS = uow.get( Cargos.class, CargosEntity.CARGOS_ID );
        new BookNewCargo( CARGOS, HONGKONG, STOCKHOLM, day( 0 ) ).book();
    }

View Full Code Here

    }


    @Test
    public void deviation_2b_3_DeadlineTomorrowIsOkay() throws Exception
    {
        UnitOfWork uow = module.currentUnitOfWork();
        Location HONGKONG = uow.get( Location.class, CNHKG.code().get() );
        Location STOCKHOLM = uow.get( Location.class, SESTO.code().get() );
        Cargos CARGOS = uow.get( Cargos.class, CargosEntity.CARGOS_ID );
        new BookNewCargo( CARGOS, HONGKONG, STOCKHOLM, day( 1 ) ).book();
    }

View Full Code Here

    }


    @Test
    public void step_2_CreateNewCargo() throws Exception
    {
        UnitOfWork uow = module.currentUnitOfWork();
        Location HONGKONG = uow.get( Location.class, CNHKG.code().get() );
        Location STOCKHOLM = uow.get( Location.class, SESTO.code().get() );
        Cargos CARGOS = uow.get( Cargos.class, CargosEntity.CARGOS_ID );
        // Create cargo with valid input from customer
        TrackingId trackingId = new BookNewCargo( CARGOS, HONGKONG, STOCKHOLM, day( 17 ) ).book();


        // Retrieve created cargo from store
        Cargo cargo = uow.get( Cargo.class, trackingId.id().get() );


        // Test cargo data
        assertThat( cargo.trackingId().get(), is( equalTo( trackingId ) ) );
        assertThat( cargo.origin().get(), is( equalTo( HONGKONG ) ) );

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    }


    @Test( expected = FoundNoRoutesException.class )
    public void deviation_3a_NoRoutesCanBeThatFast() throws Exception
    {
        UnitOfWork uow = module.currentUnitOfWork();
        Location HONGKONG = uow.get( Location.class, CNHKG.code().get() );
        Location STOCKHOLM = uow.get( Location.class, SESTO.code().get() );
        Cargos CARGOS = uow.get( Cargos.class, CargosEntity.CARGOS_ID );
        TrackingId trackingId = new BookNewCargo( CARGOS, HONGKONG, STOCKHOLM, day( 1 ) ).book();
        Cargo cargo = uow.get( Cargo.class, trackingId.id().get() );


        // No routes will be found
        new BookNewCargo( cargo ).routeCandidates();
    }

View Full Code Here


    @Before
    public void beforeEachTest()
        throws Exception
    {
        UnitOfWork uow = module.currentUnitOfWork();
        Cargos CARGOS = uow.get( Cargos.class, CargosEntity.CARGOS_ID );
        Location HONGKONG = uow.get( Location.class, CNHKG.code().get() );
        SHANGHAI = uow.get( Location.class, CNSHA.code().get() );
        STOCKHOLM = uow.get( Location.class, SESTO.code().get() );
        Location NEWYORK = uow.get( Location.class, USNYC.code().get() );
        DALLAS = uow.get( Location.class, USDAL.code().get() );
        Voyage V100S = uow.get( Voyage.class, "V100S" );
        V200T = uow.get( Voyage.class, "V200T" );
        V300A = uow.get( Voyage.class, "V300A" );


        // Create cargo
        trackingId = new BookNewCargo( CARGOS, HONGKONG, STOCKHOLM, day( 17 ) ).createCargo( "ABC" );
        cargo = uow.get( Cargo.class, trackingId.id().get() );
        Itinerary itinerary = itinerary(
            leg( V100S, HONGKONG, NEWYORK, day( 1 ), day( 8 ) ),
            leg( V200T, NEWYORK, DALLAS, day( 9 ), day( 12 ) ),
            leg( V300A, DALLAS, STOCKHOLM, day( 13 ), day( 16 ) )
        );

View Full Code Here

    }


    @Test
    public void step_3_CalculatePossibleRoutes() throws Exception
    {
        UnitOfWork uow = module.currentUnitOfWork();
        Location HONGKONG = uow.get( Location.class, CNHKG.code().get() );
        Location STOCKHOLM = uow.get( Location.class, SESTO.code().get() );
        Cargos CARGOS = uow.get( Cargos.class, CargosEntity.CARGOS_ID );


        // Create valid cargo
        TrackingId trackingId = new BookNewCargo( CARGOS, HONGKONG, STOCKHOLM, day( 30 ) ).book();
        Cargo cargo = uow.get( Cargo.class, trackingId.id().get() );


        // Step 3 - Find possible routes
        List<Itinerary> routeCandidates = new BookNewCargo( cargo ).routeCandidates();


        // Check possible routes

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    }


    @Test
    public void step_5_AssignCargoToRoute() throws Exception
    {
        UnitOfWork uow = module.currentUnitOfWork();
        Location HONGKONG = uow.get( Location.class, CNHKG.code().get() );
        Location STOCKHOLM = uow.get( Location.class, SESTO.code().get() );
        Cargos CARGOS = uow.get( Cargos.class, CargosEntity.CARGOS_ID );


        // Create valid cargo
        Date deadline = day( 30 );
        TrackingId trackingId = new BookNewCargo( CARGOS, HONGKONG, STOCKHOLM, deadline ).book();
        Cargo cargo = uow.get( Cargo.class, trackingId.id().get() );


        List<Itinerary> routeCandidates = new BookNewCargo( cargo ).routeCandidates();


        // Get first route found
        // Would normally be found with an Itinerary id from customer selection

View Full Code Here

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