Question

如果我有以下设置，当在同一个上下文中创建对象时，如何配置我的容器以使用相同的数据库

public class Database { }
public interface IRepository { Database Database { get; } }
public interface IFooRepository : IRepository { }
public interface IBarRepository : IRepository { }

public class FooRepository : IFooRepository
{
    public Database Database { get; private set; }
    public FooRepository(Database database) { this.Database = database; }
}

public class BarRepository : IBarRepository
{
    public Database Database { get; private set; }
    public BarRepository(Database database) { this.Database = database; }
}

public class Consumer
{
    public IFooRepository fooRepository { get; private set; }
    public IBarRepository barRepository { get; private set; }
    public Consumer(IFooRepository fooRepository, IBarRepository barRepository)
    {
        this.fooRepository = fooRepository;
        this.barRepository = barRepository;
    }
}

[TestClass]
public class ConfigurationTest
{
    private IWindsorContainer container;

    [TestMethod]
    public void SameDatabaseIsUsed()
    {
        Consumer consumer = container.Resolve<Consumer>();
        IFooRepository fooRepository = consumer.fooRepository;
        IBarRepository barRepository = consumer.barRepository;
        Assert.AreEqual(fooRepository.Database, barRepository.Database); //FAILS
    }

    [TestMethod]
    public void DifferentDatabaseIsUsed()
    {
        Consumer consumer = container.Resolve<Consumer>();
        IFooRepository fooRepository = consumer.fooRepository;
        Consumer consumer2 = container.Resolve<Consumer>();
        IBarRepository barRepository = consumer2.barRepository;
        Assert.AreNotEqual(fooRepository.Database, barRepository.Database); //PASSES
    }

    [TestInitialize]
    public void SetUp()
    {
        container = new WindsorContainer();
        container.Register(
            Component.For<Database>().ImplementedBy<Database>().LifeStyle.Transient,
            AllTypes.FromThisAssembly()
                    .BasedOn<IRepository>().WithService.FromInterface()
                    .Configure(c => c.LifeStyle.Transient),
            Component.For<Consumer>().ImplementedBy<Consumer>().LifeStyle.Transient
                    );

    }
}

编辑：我试图使用自定义的生活方式，但我无法弄清楚我可以用什么来检测我已切换上下文

public class DatabaseLifestyleManager : AbstractLifestyleManager
{
    private CreationContext context;
    private Database database;

    private Database Database
    {
        get
        {
            if (database == null) database = new Database();
            return database;
        }
        set 
        {
            database = null;
        }
    }

    public override object Resolve(CreationContext context)
    {
        if (this.context!=null && this.context.??? == context.???)
            return Database;
        else
        {
            this.context = context;
            Database = null;
            return Database;
        }

    }

    public override void Dispose()
    {
        database = null;
        context = null;
    }
}
......
Component.For<Database>().ImplementedBy<Database>().LifeStyle.Custom(typeof(DatabaseLifestyleManager)

Answer 1

在请求瞬态组件时，您总是会得到一个新实例，如果不是您想要的不使用瞬态生活方式： - ）

为什么要注册瞬态组件，但尝试根据某种“上下文”解析同一个对象？很可能这种情况下的生活方式是错误的，而且你很难将其强制转化为不适合的事情。

你想要的是像this article中提到的情境生活方式。以下两个要点有一个实现：

这将允许您这样做：

Register(Component.For<Database>().LifeStyle.Scoped())

[TestMethod]
public void SameDatabaseIsUsed()
{
    using (container.BeginScope())
    {
        Consumer consumer = container.Resolve<Consumer>();
        IFooRepository fooRepository = consumer.fooRepository;
        IBarRepository barRepository = consumer.barRepository;
        Assert.AreEqual(fooRepository.Database, barRepository.Database); // YAY!
    }
}

希望这有帮助！

Answer 2

contextual lifestyle中包含Castle.Windsor.Lifestyles contrib project。

Answer 3

我自己通过实现IDisposable来提出这个解决方案，这样我就可以为数据库使用一种会话镜

这是处理这种情况的有效方法吗？

所有测试通过，但有一些附加功能，必须在我未来的所有存储库使用者中实现：

public class Database { }
public interface IRepository : IDisposable { Database Database { get; } }
public interface IFooRepository : IRepository { }
public interface IBarRepository : IRepository { }

public abstract class BaseRepository : IDisposable
{
    public BaseRepository(Database database) { this.Database = database; }
    public Database Database { get; private set; }
    public void Dispose() { Database = null; }
}

public class FooRepository : BaseRepository, IFooRepository
{
    public FooRepository(Database database) : base(database) { }
}

public class BarRepository : BaseRepository, IBarRepository
{
    public BarRepository(Database database) : base(database) { }
}

public abstract class BaseConsumer : IDisposable
{
    public abstract void Dispose();
}

public class Consumer : BaseConsumer
{
    public IFooRepository fooRepository { get; private set; }
    public IBarRepository barRepository { get; private set; }

    public Consumer(IFooRepository fooRepository, IBarRepository barRepository)
    {
        this.fooRepository = fooRepository;
        this.barRepository = barRepository;
    }

    public override void Dispose()
    {
        this.fooRepository.Dispose();
        this.barRepository.Dispose();
    }
}

[TestClass]
public class ConfigurationTest
{
    private IWindsorContainer container;

    [TestMethod]
    public void SameDatabaseIsUsed()
    {
        IFooRepository fooRepository;
        IBarRepository barRepository;
        using (Consumer consumer = container.Resolve<Consumer>())
        {
            fooRepository = consumer.fooRepository;
            barRepository = consumer.barRepository;
            Assert.AreEqual(fooRepository.Database, barRepository.Database); //FAILS
        }
        Assert.IsNull(fooRepository.Database);
        Assert.IsNull(barRepository.Database);

    }

    [TestMethod]
    public void DifferentDatabaseIsUsed()
    {
        IFooRepository fooRepository;
        IBarRepository barRepository;

        using (Consumer consumer = container.Resolve<Consumer>())
            fooRepository = consumer.fooRepository;

        Assert.IsNull(fooRepository.Database);

        using (Consumer consumer2 = container.Resolve<Consumer>())
            barRepository = consumer2.barRepository;

        Assert.IsNull(barRepository.Database);
    }

    [TestInitialize]
    public void SetUp()
    {
        container = new WindsorContainer().Register(
            Component.For<Database>().ImplementedBy<Database>().LifeStyle.Singleton,
            AllTypes.FromThisAssembly()
                    .BasedOn<IRepository>().WithService.FromInterface()
                    .Configure(c => c.LifeStyle.Transient),
            Component.For<Consumer>().ImplementedBy<Consumer>().LifeStyle.Transient
                    );
    }
}

如何使用Castle Windsor DI容器在相同的上下文中重用瞬态依赖项

3 个答案: