Created
April 25, 2021 12:02
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Sample for Rx Blog - Using Rx to Create more readable timer which stops when no one is listening
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#r "nuget:System.Reactive/5.0.0" | |
using System.Reactive.Linq; | |
public class TimeStopWhenNoOneCares | |
{ | |
private IObservable<long> _Interval; | |
private long _Time; | |
public IDisposable ObserveTime( Action<long> subscriber ) | |
{ | |
if (_Interval == null) | |
{ | |
_Interval = Observable.Create<long>( observer => { | |
bool stop = false; | |
Task.Run( ()=>{ | |
while (!stop) | |
{ | |
observer.OnNext(_Time); | |
Task.Delay(1000).Wait(); | |
_Time++; | |
} | |
}); | |
// return function to call when observable was being destroyed | |
return ()=> | |
{ | |
_Interval = null; | |
stop = true; | |
}; | |
}).Replay(1).RefCount(1); | |
} | |
return _Interval.Subscribe( subscriber ); | |
} | |
} | |
TimeStopWhenNoOneCares t = new(); | |
var observer = t.ObserveTime( time =>{ | |
Console.WriteLine( time); | |
}); | |
Console.ReadLine(); | |
observer.Dispose(); | |
Console.WriteLine( "Time stop" ); | |
Console.ReadLine(); | |
Console.WriteLine( "Time continue from last value" ); | |
t.ObserveTime( time =>{ | |
Console.WriteLine( time); | |
}); | |
Console.ReadLine(); |
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