[Architect] Abp 框架原理解析(5) UnitOfWork
本节目录
介绍
UOW(全称UnitOfWork)是指工作单元.
在Abp中,工作单元对于仓储和应用服务方法默认开启。并在一次请求中,共享同一个工作单元.
同时在Abp中,不仅支持同一个数据库连接,还支持事务处理.
分析Abp源码
1.UnitOfWorkRegistrar
2.ComponentRegistered
3.IsConventionalUowClass
4.Intercept
5.PerformSyncUow
实现UOW
定义IUnitOfWork
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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; }
} |
实现uow,在uow中会提供db的创建,这样才能管理到每个db.
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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()
{
}
} |
定义与实现仓储层,这里不再做DbProvider.
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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);
}
} |
定义与实现应用层
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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; }
} |
定义与实现uow拦截器
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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();
}
} |
定义在IApplicationService与IRepository接口下拦截
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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)));
}
} |
执行
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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();
} |
会自动在application method的结尾调用Complete.
另外也可以在uow上定义option为启用事务.在本例中稍作扩展即可实现.