正确的方法合并观察序列从多个实例触发的事件 [英] Correct way to merge observable sequences for events fired from multiple instances
问题描述
说我有新车能输出类型T的实例的工厂方法,我希望有一个接收可观察序列,从所有的情况下,发起了工厂方法触发的事件。
时使用合并(),因为我做了下面的正确的和最佳的方式来实现这一目标?
我这样做的另一种方法是使用一个静态事件,使可观察序列出来的,但是我一般不喜欢使用静态的事件,很好奇任何接收专家认为将是最佳的这种情况?
公共牛逼MakeFoo< T>()其中T:美孚,新的()
{
this.instanceOfObservable.Merge(新T());
回归自我;
}
公共类ObservableSequence:的IObservable< EventArgs的>中了IDisposable
{
私人的IObservable< EventArgs的>流;
公共ObservableSequence()
{
}
//此方法是所谓的工厂方法对于T的每个新实例
公共无效合并(美孚实例)
{
如果(this.stream == NULL)
{
this.stream =初始化(实例);
}
其他
{
的IObservable< EventArgs的>接下来=初始化(实例);
this.stream.Merge(下);
}
}
私人的IObservable< EventArgs的>初始化(富实例)
{
返回Observable.FromEvent
<事件处理程序< EventArgs的>中的EventArgs>(处理器=>
{
事件处理程序< EventArgs的> EH =(发件人,E)=> {
处理器(E);
};
返回诶;
},
诶=> instance.SomeEvent + =诶,
诶=> instance.SomeEvent - = EH)
。重复()
.Retry()
。发布()
.RefCount();
}
公共无效的Dispose()
{
}
公共IDisposable的订阅(IObserver< EventArgs的>观察员)
{
返回stream.Subscribe(观察员);
}
}
滥用合并
一样,是的没有的效率非常高。最简单的方法是通过一个主题,也就是你控制手的的IObservable。
公共静态类MyAwesomeFooFactory
{
只读静态受试对象; SomeEventArgs> someEvents =新的受试对象; SomeEventArgs>();
公共静态的IObservable< SomeEventArgs> NotificationsFromAllTheEvents {{返回someEvent; }}
公共静态美孚MakeANewFoo()
{
VAR RET =新的Foo();
ret.SomeEvent.Subscribe(someEvents); //注意:我们从来没有退订,* EVAR *
返回RET;
}
}
Say I have a factory method that churns out instances of type T, and I want an Rx observable sequence for events fired from all my instances originating out of the factory method.
Is using Merge() as I have done below the correct and optimal way to achieve this?
The other way I did this was to use a static event and make the observable sequence out of that, however I generally don't like using static events and am curious what any Rx experts think would be optimal in this situation?
public T MakeFoo<T>() where T: Foo, new()
{
this.instanceOfObservable.Merge(new T());
return self;
}
public class ObservableSequence : IObservable<EventArgs>, IDisposable
{
private IObservable<EventArgs> stream;
public ObservableSequence()
{
}
// this method is called in the factory method for each new instance of T
public void Merge(Foo instance)
{
if (this.stream == null)
{
this.stream = Init(instance);
}
else
{
IObservable<EventArgs> next = Init(instance);
this.stream.Merge(next);
}
}
private IObservable<EventArgs> Init(Foo instance)
{
return Observable.FromEvent
<EventHandler<EventArgs>, EventArgs>(handler =>
{
EventHandler<EventArgs> eh = (sender, e) => {
handler(e);
};
return eh;
},
eh => instance.SomeEvent += eh ,
eh => instance.SomeEvent -= eh )
.Repeat()
.Retry()
.Publish()
.RefCount();
}
public void Dispose()
{
}
public IDisposable Subscribe(IObserver<EventArgs> observer)
{
return stream.Subscribe(observer);
}
}
Abusing Merge
like that is not very efficient. The most straightforward way is via a Subject, which is an IObservable you control by hand.
public static class MyAwesomeFooFactory
{
readonly static Subject<SomeEventArgs> someEvents = new Subject<SomeEventArgs>();
public static IObservable<SomeEventArgs> NotificationsFromAllTheEvents { get { return someEvent; }}
public static Foo MakeANewFoo()
{
var ret = new Foo();
ret.SomeEvent.Subscribe(someEvents); // NB: We never unsubscribe, *evar*
return ret;
}
}
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