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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System.Reactive.Concurrency;
using System.Reactive.Linq;
namespace System.Reactive.Subjects
{
/// <summary>
/// Provides a set of static methods for creating subjects.
/// </summary>
public static class Subject
{
/// <summary>
/// Creates a subject from the specified observer and observable.
/// </summary>
/// <typeparam name="TSource">The type of the elements received by the observer.</typeparam>
/// <typeparam name="TResult">The type of the elements produced by the observable sequence.</typeparam>
/// <param name="observer">The observer used to send messages to the subject.</param>
/// <param name="observable">The observable used to subscribe to messages sent from the subject.</param>
/// <returns>Subject implemented using the given observer and observable.</returns>
/// <exception cref="ArgumentNullException"><paramref name="observer"/> or <paramref name="observable"/> is null.</exception>
public static ISubject<TSource, TResult> Create<TSource, TResult>(IObserver<TSource> observer, IObservable<TResult> observable)
{
if (observer == null)
throw new ArgumentNullException("observer");
if (observable == null)
throw new ArgumentNullException("observable");
return new AnonymousSubject<TSource, TResult>(observer, observable);
}
/// <summary>
/// Synchronizes the messages sent to the subject.
/// </summary>
/// <typeparam name="TSource">The type of the elements received by the subject.</typeparam>
/// <typeparam name="TResult">The type of the elements produced by the subject.</typeparam>
/// <param name="subject">The subject to synchronize.</param>
/// <returns>Subject whose messages are synchronized.</returns>
/// <exception cref="ArgumentNullException"><paramref name="subject"/> is null.</exception>
public static ISubject<TSource, TResult> Synchronize<TSource, TResult>(ISubject<TSource, TResult> subject)
{
if (subject == null)
throw new ArgumentNullException("subject");
return new AnonymousSubject<TSource, TResult>(Observer.Synchronize(subject), subject);
}
/// <summary>
/// Synchronizes the messages sent to the subject and notifies observers on the specified scheduler.
/// </summary>
/// <typeparam name="TSource">The type of the elements received by the subject.</typeparam>
/// <typeparam name="TResult">The type of the elements produced by the subject.</typeparam>
/// <param name="subject">The subject to synchronize.</param>
/// <param name="scheduler">Scheduler to notify observers on.</param>
/// <returns>Subject whose messages are synchronized and whose observers are notified on the given scheduler.</returns>
/// <exception cref="ArgumentNullException"><paramref name="subject"/> or <paramref name="scheduler"/> is null.</exception>
public static ISubject<TSource, TResult> Synchronize<TSource, TResult>(ISubject<TSource, TResult> subject, IScheduler scheduler)
{
if (subject == null)
throw new ArgumentNullException("subject");
if (scheduler == null)
throw new ArgumentNullException("scheduler");
return new AnonymousSubject<TSource, TResult>(Observer.Synchronize(subject), subject.ObserveOn(scheduler));
}
class AnonymousSubject<T, U> : ISubject<T, U>
{
private readonly IObserver<T> _observer;
private readonly IObservable<U> _observable;
public AnonymousSubject(IObserver<T> observer, IObservable<U> observable)
{
_observer = observer;
_observable = observable;
}
public void OnCompleted()
{
_observer.OnCompleted();
}
public void OnError(Exception error)
{
if (error == null)
throw new ArgumentNullException("error");
_observer.OnError(error);
}
public void OnNext(T value)
{
_observer.OnNext(value);
}
public IDisposable Subscribe(IObserver<U> observer)
{
if (observer == null)
throw new ArgumentNullException("observer");
//
// [OK] Use of unsafe Subscribe: non-pretentious wrapping of an observable sequence.
//
return _observable.Subscribe/*Unsafe*/(observer);
}
}
}
}
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