[Architect] Abp 框架原理解析(5) UnitOfWork

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public interface IUnitOfWork

{

    //1.开启事务

    //2.设置Filter(本例中不做演示)

    void Begin(UnitOfWorkOptions options);

    void Complete();

}

public class UnitOfWorkOptions

{

    public bool? IsTransactional { get; set; }

}

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public class EfUnitOfWork : UnitOfWorkBase

{

    public static DbContext DbContext { get; set; }

    public static DbContext GetDbContext()

    {

        if (DbContext == null)

        {

            DbContext = new DemoDb();

        }

        return DbContext;

    }

    public override void Begin(UnitOfWorkOptions options)

    {

        if (options.IsTransactional == true)

        {

            CurrentTransaction = new TransactionScope();

        }

    }

    public TransactionScope CurrentTransaction { get; set; }

    public override void Complete()

    {

        SaveChanges();

        if (CurrentTransaction != null)

        {

            CurrentTransaction.Complete();

        }

    }

    private void SaveChanges()

    {

        DbContext.SaveChanges();

    }

}

public abstract class UnitOfWorkBase : IUnitOfWork

{

    public virtual void Begin(UnitOfWorkOptions options)

    {

    }

    public virtual void Complete()

    {

    }

}

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public interface IRepository

{

}

public interface ITaskRepository : IRepository

{

    void Add(Task task);

}

public class TaskRepository : ITaskRepository

{

    public void Add(Task task)

    {

        var db = (DemoDb)EfUnitOfWork.GetDbContext();

        db.Tasks.Add(task);

    }

}

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public interface IApplicationService

{

}

public interface ITaskAppService : IApplicationService

{

    void CreateTask(CreateTaskInput input);

}

public class TaskAppService : ITaskAppService

{

    private ITaskRepository _repository;

    public TaskAppService(ITaskRepository repository)

    {

        _repository = repository;

    }

    public void CreateTask(CreateTaskInput input)

    {

        _repository.Add(new Task(input.Name));

    }

}

public class CreateTaskInput

{

    public string Name { get; set; }

}

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internal class UnitOfWorkInterceptor : IInterceptor

{

    private IUnitOfWork _unitOfWork;

    public UnitOfWorkInterceptor(IUnitOfWork unitOfWork)

    {

        _unitOfWork = unitOfWork;

    }

    public void Intercept(IInvocation invocation)

    {

        _unitOfWork.Begin(new UnitOfWorkOptions());

        invocation.Proceed();

        _unitOfWork.Complete();

    }

}

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static void Kernel_ComponentRegistered(string key, Castle.MicroKernel.IHandler handler)

{

    var type = handler.ComponentModel.Implementation;

    if (typeof(IApplicationService).IsAssignableFrom(type) || typeof(IRepository).IsAssignableFrom(type))

    {

        handler.ComponentModel.Interceptors.Add(new InterceptorReference(typeof(UnitOfWorkInterceptor)));

    }

}

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static void Main(string[] args)

{

    using (var container = new WindsorContainer())

    {

        container.Register(Component.For<IInterceptor, UnitOfWorkInterceptor>());//先注入拦截器

        container.Register(Component.For<IUnitOfWork, EfUnitOfWork>());

        container.Kernel.ComponentRegistered += Kernel_ComponentRegistered;

        container.Register(Component.For<ITaskAppService, TaskAppService>());

        container.Register(Component.For<ITaskRepository, TaskRepository>());

        var person = container.Resolve<ITaskAppService>();

        person.CreateTask(new CreateTaskInput() { Name = "3333" });

    }

    Console.ReadKey();

}