/
EventSubscriptionManagerService.cs
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/
EventSubscriptionManagerService.cs
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// Copyright © 2011 - Present RealDimensions Software, LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
//
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
namespace chocolatey.infrastructure.services
{
using System;
using System.Reactive.Linq;
using System.Reactive.Subjects;
using events;
using guards;
using logging;
/// <summary>
/// Implementation of IEventSubscriptionManagerService
/// </summary>
public class EventSubscriptionManagerService : IEventSubscriptionManagerService
{
//http://joseoncode.com/2010/04/29/event-aggregator-with-reactive-extensions/
//https://github.com/shiftkey/Reactive.EventAggregator
private readonly ISubject<object> _subject = new Subject<object>();
public void publish<Event>(Event eventMessage) where Event : class, IMessage
{
Ensure.that(() => eventMessage).is_not_null();
this.Log().Debug(ChocolateyLoggers.Verbose, () => "Sending message '{0}' out if there are subscribers...".format_with(typeof (Event).Name));
_subject.OnNext(eventMessage);
}
public IDisposable subscribe<Event>(Action<Event> handleEvent, Action<Exception> handleError, Func<Event, bool> filter) where Event : class, IMessage
{
if (filter == null) filter = (message) => true;
if (handleError == null) handleError = (ex) => { };
var subscription = _subject.OfType<Event>().AsObservable()
.Where(filter)
.Subscribe(handleEvent, handleError);
return subscription;
}
}
}