交易脚本的实现

Question

您能否建议我这两种（如果有）事务脚本模式中的哪一种是正确的？

基本上，我需要实现“纯” TS，这不是以某种方便的方式弯曲它。 问题是，当我从Table Data Gateway中获取数据时，我应该将它们存储以用于事务的不同部分（为清楚起见而使用逻辑部分），并在需要的地方使用它们，或者获取数据时不存储它们，而是直接使用它们如果再次需要相同的数据，请致电表网关并提出要求。

示例： http ： //pastebin.com/hGCgrfEs

谢谢。 希望如果没有让我知道这是有道理的:)

Answer 1

TSSomething2类更接近于一个很好的解决方案，我建议使用它来实现SOLID脚本实现：

public class OrderBusiness : IAcceptVisitOrder
{
    private readonly string _id;

    private int _status;

    public OrderBusiness(string id, int status)
    {
        _id = id;
        _status = status;
    }

    public void ChangeStatus(int newStatus)
    {
        //validation logic....
        _status = newStatus;
    }

    public void Accept(IOrderVisitor visitor)
    {
        if (visitor == null) throw new ArgumentNullException(nameof(visitor));
        visitor.Visit(_id, _status);
    }
}

public class Client
{
    private readonly OrderApplicationService _service;
    //Get from Service locator like ninject, etc
    private readonly IReader<OrderBusiness, string> _reader = new OrderBusinessReader();
    private readonly IOrderVisitor _visitor = new UpdateOrderVisitor();

    public Client()
    {
        _service = new OrderApplicationService(_reader, _visitor);
    }
    public void Run(UpdateOrderCommand command)
    {
        _service.When(command);
    }
}

public class UpdateOrderCommand
{
    [Required]
    public string Id { get; set; }
    [Required]
    public int Status { get; set; }
}

public class OrderApplicationService
{
    private readonly IReader<OrderBusiness, string> _reader;
    private readonly IOrderVisitor _visitor;

    public OrderApplicationService(IReader<OrderBusiness, string> reader, IOrderVisitor visitor)
    {
        if (reader == null) throw new ArgumentNullException(nameof(reader));
        if (visitor == null) throw new ArgumentNullException(nameof(visitor));
        _reader = reader;
        _visitor = visitor;
    }

    public void When(UpdateOrderCommand command)
    {
        var order = GetBusinessObject(command.Id);
        order.ChangeStatus(command.Status);
        order.Accept(_visitor);
    }

    private OrderBusiness GetBusinessObject(string id)
    {
        if (id == null) throw new ArgumentNullException(nameof(id));
        return _reader.Read(id);
    }
}

public interface IReader<out T, in TK>
{
    T Read(TK id);
}

public interface IAcceptVisitOrder
{
    void Accept(IOrderVisitor visitor);
}

public interface IOrderVisitor
{
    void Visit(string id, int status);
}

public class OrderBusinessReader : IReader<OrderBusiness, string>
{
    public OrderBusiness Read(string id)
    {
        //Read data from db with EF, ADO.NET, ETC
        var status = 0;
        return new OrderBusiness(id, status); 
    }
}

class UpdateOrderVisitor : IOrderVisitor
{
    public void Visit(string id, int status)
    {
        //Persist to database, etc
    }
}

希望这可以帮助！
问候！