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Observable.Creation.cs
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Observable.Creation.cs
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using System;
using System.Collections.Generic;
using UniRx.Operators;
namespace UniRx
{
public static partial class Observable
{
/// <summary>
/// Create anonymous observable. Observer has exception durability. This is recommended for make operator and event like generator.
/// </summary>
public static IObservable<T> Create<T>(Func<IObserver<T>, IDisposable> subscribe)
{
if (subscribe == null) throw new ArgumentNullException("subscribe");
return new CreateObservable<T>(subscribe);
}
/// <summary>
/// Create anonymous observable. Observer has exception durability. This is recommended for make operator and event like generator(HotObservable).
/// </summary>
public static IObservable<T> Create<T>(Func<IObserver<T>, IDisposable> subscribe, bool isRequiredSubscribeOnCurrentThread)
{
if (subscribe == null) throw new ArgumentNullException("subscribe");
return new CreateObservable<T>(subscribe, isRequiredSubscribeOnCurrentThread);
}
/// <summary>
/// Create anonymous observable. Observer has exception durability. This is recommended for make operator and event like generator.
/// </summary>
public static IObservable<T> CreateWithState<T, TState>(TState state, Func<TState, IObserver<T>, IDisposable> subscribe)
{
if (subscribe == null) throw new ArgumentNullException("subscribe");
return new CreateObservable<T, TState>(state, subscribe);
}
/// <summary>
/// Create anonymous observable. Observer has exception durability. This is recommended for make operator and event like generator(HotObservable).
/// </summary>
public static IObservable<T> CreateWithState<T, TState>(TState state, Func<TState, IObserver<T>, IDisposable> subscribe, bool isRequiredSubscribeOnCurrentThread)
{
if (subscribe == null) throw new ArgumentNullException("subscribe");
return new CreateObservable<T, TState>(state, subscribe, isRequiredSubscribeOnCurrentThread);
}
/// <summary>
/// Create anonymous observable. Safe means auto detach when error raised in onNext pipeline. This is recommended for make generator (ColdObservable).
/// </summary>
public static IObservable<T> CreateSafe<T>(Func<IObserver<T>, IDisposable> subscribe)
{
if (subscribe == null) throw new ArgumentNullException("subscribe");
return new CreateSafeObservable<T>(subscribe);
}
/// <summary>
/// Create anonymous observable. Safe means auto detach when error raised in onNext pipeline. This is recommended for make generator (ColdObservable).
/// </summary>
public static IObservable<T> CreateSafe<T>(Func<IObserver<T>, IDisposable> subscribe, bool isRequiredSubscribeOnCurrentThread)
{
if (subscribe == null) throw new ArgumentNullException("subscribe");
return new CreateSafeObservable<T>(subscribe, isRequiredSubscribeOnCurrentThread);
}
/// <summary>
/// Empty Observable. Returns only OnCompleted.
/// </summary>
public static IObservable<T> Empty<T>()
{
return Empty<T>(Scheduler.DefaultSchedulers.ConstantTimeOperations);
}
/// <summary>
/// Empty Observable. Returns only OnCompleted on specified scheduler.
/// </summary>
public static IObservable<T> Empty<T>(IScheduler scheduler)
{
if (scheduler == Scheduler.Immediate)
{
return ImmutableEmptyObservable<T>.Instance;
}
else
{
return new EmptyObservable<T>(scheduler);
}
}
/// <summary>
/// Empty Observable. Returns only OnCompleted. witness is for type inference.
/// </summary>
public static IObservable<T> Empty<T>(T witness)
{
return Empty<T>(Scheduler.DefaultSchedulers.ConstantTimeOperations);
}
/// <summary>
/// Empty Observable. Returns only OnCompleted on specified scheduler. witness is for type inference.
/// </summary>
public static IObservable<T> Empty<T>(IScheduler scheduler, T witness)
{
return Empty<T>(scheduler);
}
/// <summary>
/// Non-Terminating Observable. It's no returns, never finish.
/// </summary>
public static IObservable<T> Never<T>()
{
return ImmutableNeverObservable<T>.Instance;
}
/// <summary>
/// Non-Terminating Observable. It's no returns, never finish. witness is for type inference.
/// </summary>
public static IObservable<T> Never<T>(T witness)
{
return ImmutableNeverObservable<T>.Instance;
}
/// <summary>
/// Return single sequence Immediately.
/// </summary>
public static IObservable<T> Return<T>(T value)
{
return Return<T>(value, Scheduler.DefaultSchedulers.ConstantTimeOperations);
}
/// <summary>
/// Return single sequence on specified scheduler.
/// </summary>
public static IObservable<T> Return<T>(T value, IScheduler scheduler)
{
if (scheduler == Scheduler.Immediate)
{
return new ImmediateReturnObservable<T>(value);
}
else
{
return new ReturnObservable<T>(value, scheduler);
}
}
/// <summary>
/// Return single sequence Immediately, optimized for Unit(no allocate memory).
/// </summary>
public static IObservable<Unit> Return(Unit value)
{
return ImmutableReturnUnitObservable.Instance;
}
/// <summary>
/// Return single sequence Immediately, optimized for Boolean(no allocate memory).
/// </summary>
public static IObservable<bool> Return(bool value)
{
return (value == true)
? (IObservable<bool>)ImmutableReturnTrueObservable.Instance
: (IObservable<bool>)ImmutableReturnFalseObservable.Instance;
}
/// <summary>
/// Return single sequence Immediately, optimized for Int32.
/// </summary>
public static IObservable<Int32> Return(int value)
{
return ImmutableReturnInt32Observable.GetInt32Observable(value);
}
/// <summary>
/// Same as Observable.Return(Unit.Default); but no allocate memory.
/// </summary>
public static IObservable<Unit> ReturnUnit()
{
return ImmutableReturnUnitObservable.Instance;
}
/// <summary>
/// Empty Observable. Returns only onError.
/// </summary>
public static IObservable<T> Throw<T>(Exception error)
{
return Throw<T>(error, Scheduler.DefaultSchedulers.ConstantTimeOperations);
}
/// <summary>
/// Empty Observable. Returns only onError. witness if for Type inference.
/// </summary>
public static IObservable<T> Throw<T>(Exception error, T witness)
{
return Throw<T>(error, Scheduler.DefaultSchedulers.ConstantTimeOperations);
}
/// <summary>
/// Empty Observable. Returns only onError on specified scheduler.
/// </summary>
public static IObservable<T> Throw<T>(Exception error, IScheduler scheduler)
{
return new ThrowObservable<T>(error, scheduler);
}
/// <summary>
/// Empty Observable. Returns only onError on specified scheduler. witness if for Type inference.
/// </summary>
public static IObservable<T> Throw<T>(Exception error, IScheduler scheduler, T witness)
{
return Throw<T>(error, scheduler);
}
public static IObservable<int> Range(int start, int count)
{
return Range(start, count, Scheduler.DefaultSchedulers.Iteration);
}
public static IObservable<int> Range(int start, int count, IScheduler scheduler)
{
return new RangeObservable(start, count, scheduler);
}
public static IObservable<T> Repeat<T>(T value)
{
return Repeat(value, Scheduler.DefaultSchedulers.Iteration);
}
public static IObservable<T> Repeat<T>(T value, IScheduler scheduler)
{
if (scheduler == null) throw new ArgumentNullException("scheduler");
return new RepeatObservable<T>(value, null, scheduler);
}
public static IObservable<T> Repeat<T>(T value, int repeatCount)
{
return Repeat(value, repeatCount, Scheduler.DefaultSchedulers.Iteration);
}
public static IObservable<T> Repeat<T>(T value, int repeatCount, IScheduler scheduler)
{
if (repeatCount < 0) throw new ArgumentOutOfRangeException("repeatCount");
if (scheduler == null) throw new ArgumentNullException("scheduler");
return new RepeatObservable<T>(value, repeatCount, scheduler);
}
public static IObservable<T> Repeat<T>(this IObservable<T> source)
{
return RepeatInfinite(source).Concat();
}
static IEnumerable<IObservable<T>> RepeatInfinite<T>(IObservable<T> source)
{
while (true)
{
yield return source;
}
}
/// <summary>
/// Same as Repeat() but if arriving contiguous "OnComplete" Repeat stops.
/// </summary>
public static IObservable<T> RepeatSafe<T>(this IObservable<T> source)
{
return new RepeatSafeObservable<T>(RepeatInfinite(source), source.IsRequiredSubscribeOnCurrentThread());
}
public static IObservable<T> Defer<T>(Func<IObservable<T>> observableFactory)
{
return new DeferObservable<T>(observableFactory);
}
public static IObservable<T> Start<T>(Func<T> function)
{
return new StartObservable<T>(function, null, Scheduler.DefaultSchedulers.AsyncConversions);
}
public static IObservable<T> Start<T>(Func<T> function, TimeSpan timeSpan)
{
return new StartObservable<T>(function, timeSpan, Scheduler.DefaultSchedulers.AsyncConversions);
}
public static IObservable<T> Start<T>(Func<T> function, IScheduler scheduler)
{
return new StartObservable<T>(function, null, scheduler);
}
public static IObservable<T> Start<T>(Func<T> function, TimeSpan timeSpan, IScheduler scheduler)
{
return new StartObservable<T>(function, timeSpan, scheduler);
}
public static IObservable<Unit> Start(Action action)
{
return new StartObservable<Unit>(action, null, Scheduler.DefaultSchedulers.AsyncConversions);
}
public static IObservable<Unit> Start(Action action, TimeSpan timeSpan)
{
return new StartObservable<Unit>(action, timeSpan, Scheduler.DefaultSchedulers.AsyncConversions);
}
public static IObservable<Unit> Start(Action action, IScheduler scheduler)
{
return new StartObservable<Unit>(action, null, scheduler);
}
public static IObservable<Unit> Start(Action action, TimeSpan timeSpan, IScheduler scheduler)
{
return new StartObservable<Unit>(action, timeSpan, scheduler);
}
public static Func<IObservable<T>> ToAsync<T>(Func<T> function)
{
return ToAsync(function, Scheduler.DefaultSchedulers.AsyncConversions);
}
public static Func<IObservable<T>> ToAsync<T>(Func<T> function, IScheduler scheduler)
{
return () =>
{
var subject = new AsyncSubject<T>();
scheduler.Schedule(() =>
{
var result = default(T);
try
{
result = function();
}
catch (Exception exception)
{
subject.OnError(exception);
return;
}
subject.OnNext(result);
subject.OnCompleted();
});
return subject.AsObservable();
};
}
public static Func<IObservable<Unit>> ToAsync(Action action)
{
return ToAsync(action, Scheduler.DefaultSchedulers.AsyncConversions);
}
public static Func<IObservable<Unit>> ToAsync(Action action, IScheduler scheduler)
{
return () =>
{
var subject = new AsyncSubject<Unit>();
scheduler.Schedule(() =>
{
try
{
action();
}
catch (Exception exception)
{
subject.OnError(exception);
return;
}
subject.OnNext(Unit.Default);
subject.OnCompleted();
});
return subject.AsObservable();
};
}
}
}