97 lines
2.7 KiB
C#
97 lines
2.7 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.Linq;
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namespace System.Reactive.Joins
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{
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internal interface IJoinObserver : IDisposable
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{
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void Subscribe(object gate);
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void Dequeue();
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}
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internal sealed class JoinObserver<T> : ObserverBase<Notification<T>>, IJoinObserver
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{
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private object gate;
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private readonly IObservable<T> source;
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private readonly Action<Exception> onError;
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private List<ActivePlan> activePlans;
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public Queue<Notification<T>> Queue { get; private set; }
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private readonly SingleAssignmentDisposable subscription;
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private bool isDisposed;
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public JoinObserver(IObservable<T> source, Action<Exception> onError)
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{
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this.source = source;
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this.onError = onError;
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Queue = new Queue<Notification<T>>();
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subscription = new SingleAssignmentDisposable();
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activePlans = new List<ActivePlan>();
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}
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public void AddActivePlan(ActivePlan activePlan)
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{
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activePlans.Add(activePlan);
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}
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public void Subscribe(object gate)
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{
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this.gate = gate;
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subscription.Disposable = source.Materialize().SubscribeSafe(this);
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}
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public void Dequeue()
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{
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Queue.Dequeue();
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}
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protected override void OnNextCore(Notification<T> notification)
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{
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lock (gate)
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{
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if (!isDisposed)
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{
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if (notification.Kind == NotificationKind.OnError)
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{
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onError(notification.Exception);
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return;
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}
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Queue.Enqueue(notification);
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foreach (var activePlan in activePlans.ToArray())
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activePlan.Match();
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}
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}
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}
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protected override void OnErrorCore(Exception exception)
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{
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}
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protected override void OnCompletedCore()
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{
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}
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internal void RemoveActivePlan(ActivePlan activePlan)
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{
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activePlans.Remove(activePlan);
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if (activePlans.Count == 0)
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Dispose();
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}
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protected override void Dispose(bool disposing)
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{
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base.Dispose(disposing);
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if (!isDisposed)
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{
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if (disposing)
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subscription.Dispose();
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isDisposed = true;
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}
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}
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}
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}
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