85 lines
3.0 KiB
C#
85 lines
3.0 KiB
C#
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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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using System.Collections.Generic;
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using System.Reactive.Disposables;
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using System.Reactive.Joins;
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namespace System.Reactive.Linq
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{
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internal partial class QueryLanguage
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{
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#region And
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public virtual Pattern<TLeft, TRight> And<TLeft, TRight>(IObservable<TLeft> left, IObservable<TRight> right)
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{
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return new Pattern<TLeft, TRight>(left, right);
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}
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#endregion
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#region Then
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public virtual Plan<TResult> Then<TSource, TResult>(IObservable<TSource> source, Func<TSource, TResult> selector)
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{
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return new Pattern<TSource>(source).Then(selector);
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}
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#endregion
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#region When
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public virtual IObservable<TResult> When<TResult>(params Plan<TResult>[] plans)
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{
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return When((IEnumerable<Plan<TResult>>)plans);
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}
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public virtual IObservable<TResult> When<TResult>(IEnumerable<Plan<TResult>> plans)
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{
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return new AnonymousObservable<TResult>(observer =>
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{
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var externalSubscriptions = new Dictionary<object, IJoinObserver>();
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var gate = new object();
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var activePlans = new List<ActivePlan>();
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var outObserver = Observer.Create<TResult>(observer.OnNext,
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exception =>
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{
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foreach (var po in externalSubscriptions.Values)
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{
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po.Dispose();
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}
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observer.OnError(exception);
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},
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observer.OnCompleted);
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try
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{
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foreach (var plan in plans)
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activePlans.Add(plan.Activate(externalSubscriptions, outObserver,
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activePlan =>
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{
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activePlans.Remove(activePlan);
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if (activePlans.Count == 0)
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outObserver.OnCompleted();
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}));
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}
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catch (Exception e)
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{
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//
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// [OK] Use of unsafe Subscribe: we're calling into a known producer implementation.
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//
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return Throw<TResult>(e).Subscribe/*Unsafe*/(observer);
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}
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var group = new CompositeDisposable(externalSubscriptions.Values.Count);
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foreach (var joinObserver in externalSubscriptions.Values)
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{
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joinObserver.Subscribe(gate);
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group.Add(joinObserver);
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}
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return group;
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});
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}
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#endregion
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}
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}
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