/// <summary>
/// Observers (subscribers) will receive notifications on the specified
/// SynchronizationContext. For subscribers which need to manipulate GUI
/// make sure this is the GUI SynchronizationContext.
/// </summary>
public Behaviour <A> ObserveOn(SynchronizationContext context)
{
var r = new Behaviour <A>(Value);
Subject.ObserveOn(context).Subscribe(r.Subject);
return(r);
}
public AppUserModelService(IUserApiService userApiService, ILogger logger, IAppSettings appSettings)
{
_favouriteCakes = new SourceCache <CakeDto, int>(c => c.Id);
_appSettings = appSettings;
_userIdSubject = new BehaviorSubject <string>(String.Empty);
_userSubject = new BehaviorSubject <UserDto>(null);
_cd = new CompositeDisposable();
_favouriteCakes
.Connect()
.CacheChangeSet(CacheKey, logger)
.Subscribe();
_userIdSubject
.ObserveOn(RxApp.TaskpoolScheduler)
.Where(u => u != null)
.SelectMany(async uId => await userApiService.GetFavourites(uId))
.RetryWithBackoff(3)
.LogException(logger)
.Subscribe(cakes =>
{
_favouriteCakes.Edit(l => l.AddOrUpdate(cakes));
})
.DisposeWith(_cd);
Observable.FromAsync(async() => await _favouriteCakes.FromCache(CacheKey, EqualityComparer <CakeDto> .Default)).Subscribe().DisposeWith(_cd);
}
public EditableTableViewModel(IAlertController alerts, INavigationService navigationService, ISchedulerService schedulerService)
: base(navigationService, schedulerService)
{
Intent = TableIntent.Form; // More common?
_alerts = alerts;
_toggleEditModeCommand = new Command((obj) => ToggleEditMode());
_editBarItem = new TextToolbarItemViewModel("Edit", _toggleEditModeCommand);
_editMode.ObserveOn(schedulerService.UiScheduler).Subscribe((em) =>
{
_editBarItem.Text = em ? DoneButtonCaption : EditButtonCaption;
Sections.ForEach(s => s.EditMode = em);
});
Toolbar.Add(_editBarItem);
}
public void ReadonlyCollectionDynamicData()
{
var scheduler = new TestScheduler();
var list = new SourceList <int>();
var filterFunc = new BehaviorSubject <Func <int, bool> >(x => true);
list.Connect()
//if you comment out the filter or the observeon then this passes
.Filter(filterFunc.ObserveOn(scheduler))
.ObserveOn(scheduler)
.Bind(out var oc)
.Subscribe();
list.Edit(updateAction =>
{
updateAction.Add(1);
updateAction.Add(2);
updateAction.Add(3);
});
scheduler.Start();
oc.Count.Should().Be(3);
list.Edit(updateAction =>
{
updateAction.Remove(1);
updateAction.Remove(2);
updateAction.Remove(3);
updateAction.Count.Should().Be(0);
updateAction.Add(4);
updateAction.Add(5);
updateAction.Add(6);
});
scheduler.Start();
//This fails and those other update actions aren't removed
oc.Count.Should().Be(3);
}
public IObservable <string> ExecutablesChanged()
{
_watcher = new FileSystemWatcher
{
Path = _configuration.ServiceBinPath,
NotifyFilter = NotifyFilters.LastWrite,
EnableRaisingEvents = true
};
_watcher.Changed += (_, fileInfo) =>
{
if (!(fileInfo.FullPath.EndsWith(".exe") || fileInfo.FullPath.EndsWith(".dll") || fileInfo.FullPath.EndsWith(".config")))
{
return;
}
_observable.OnNext(_configuration.StartupFile);
};
return(_observable
.ObserveOn(Scheduler.Default)
.Throttle(TimeSpan.FromSeconds(20)));
}
public AppConnectionsSet(UniqueId appInstanceId)
{
_appInstanceId = appInstanceId;
UpdatedEventStream = _updatedSubject.ObserveOn(TaskPoolScheduler.Default);
}
public void ThreadSwitching()
{
Console.WriteLine("Starting Thread " + Thread.CurrentThread.ManagedThreadId);
BehaviorSubject<int> s1 = new BehaviorSubject<int>(2);
BehaviorSubject<int> s2 = new BehaviorSubject<int>(3);
BehaviorSubject<int> sum = new BehaviorSubject<int>(5);
List<int> computeThreads = new List<int>();
List<int> receiveThreads = new List<int>();
IScheduler switchScheduler = new EventLoopScheduler();
IScheduler computeScheduler = new EventLoopScheduler();
IObservable<int> sumObservable = s1.Select(v => new Tuple<int, int>(v, s2.Value)).Merge(s2.Select(v => new Tuple<int, int>(s1.Value, v))).Throttle(TimeSpan.FromMilliseconds(100), switchScheduler).Select(v =>
{
Console.WriteLine("Not yet switching computing value " + v.Item1 + " + " + v.Item2 + " = " + (v.Item1 + v.Item2) + " from Thread " + Thread.CurrentThread.ManagedThreadId + ".");
return v;
}).Select(v =>
{
Console.WriteLine("Switching computing value " + v.Item1 + " + " + v.Item2 + " = " + (v.Item1 + v.Item2) + " from Thread " + Thread.CurrentThread.ManagedThreadId + ".");
return v;
}).ObserveOn(computeScheduler).Select(v =>
{
Console.WriteLine("Already switched computing value " + v.Item1 + " + " + v.Item2 + " = " + (v.Item1 + v.Item2) + " to Thread " + Thread.CurrentThread.ManagedThreadId + ".");
return v;
}).Select(v =>
{
Console.WriteLine("Computing value " + v.Item1 + " + " + v.Item2 + " = " + (v.Item1 + v.Item2) + " on Thread " + Thread.CurrentThread.ManagedThreadId + ".");
computeThreads.Add(Thread.CurrentThread.ManagedThreadId);
return v.Item1 + v.Item2;
});
sumObservable.Subscribe(sum.OnNext);
sum.ObserveOn(new EventLoopScheduler()).Subscribe(v =>
{
Console.WriteLine("Received value " + v + " on Thread " + Thread.CurrentThread.ManagedThreadId + ".");
receiveThreads.Add(Thread.CurrentThread.ManagedThreadId);
});
Thread.Sleep(150);
s2.OnNext(1);
Thread.Sleep(50);
s1.OnNext(4);
Thread.Sleep(150);
s2.OnNext(4);
Thread.Sleep(250);
s1.OnNext(1);
Thread.Sleep(150);
foreach (KeyValuePair<int, int> p in
computeThreads.GroupBy(v => v).Select(g => new KeyValuePair<int, int>(g.Key, g.Count())))
{
Console.WriteLine(p.Value + " computes on Thread " + p.Key);
}
foreach (KeyValuePair<int, int> p in
receiveThreads.GroupBy(v => v).Select(g => new KeyValuePair<int, int>(g.Key, g.Count())))
{
Console.WriteLine(p.Value + " receives on Thread " + p.Key);
}
}
public void RxOnlyAsyncObservableThreadsWithBetterThrottleOnComputeAndIsCalculating()
{
Console.WriteLine("Starting Thread " + Thread.CurrentThread.ManagedThreadId);
BehaviorSubject<int> s1 = new BehaviorSubject<int>(2);
BehaviorSubject<int> s2 = new BehaviorSubject<int>(3);
List<int> computeThreads = new List<int>();
List<int> receiveThreads = new List<int>();
IScheduler throttleScheduler = new EventLoopScheduler();
IScheduler computeScheduler = NewThreadScheduler.Default;
IScheduler receiveScheduler = new EventLoopScheduler();
IObservable<Tuple<int, int>> sumObservable = s1.CombineLatest(s2, Tuple.Create).Throttle(TimeSpan.FromMilliseconds(100), throttleScheduler);
Func<CalculatedPropertyHelper, int, int, Task<int>> calculate = async (helper, v1, v2) =>
{
Thread.Sleep(200);
helper.CheckCancellationToken();
Console.WriteLine("Computing value " + v1 + " + " + v2 + " = " + (v1 + v2) + " on Thread " + Thread.CurrentThread.ManagedThreadId + ".");
computeThreads.Add(Thread.CurrentThread.ManagedThreadId);
return await Task.FromResult(v1 + v2);
};
BehaviorSubject<int> sum = new BehaviorSubject<int>(0);
IDisposable scheduledTask = computeScheduler.ScheduleAsync(async (scheduler, token) =>
{
await scheduler.Yield();
sum.OnNext(await calculate(new CalculatedPropertyHelper(scheduler, token), s1.Value, s2.Value));
});
using (sumObservable.Subscribe(v =>
{
if (scheduledTask != null)
{
Console.WriteLine("Canceling previous.");
scheduledTask.Dispose();
}
scheduledTask = computeScheduler.ScheduleAsync(async (scheduler, token) =>
{
await scheduler.Yield();
sum.OnNext(await calculate(new CalculatedPropertyHelper(scheduler, token), v.Item1, v.Item2));
});
}))
{
using (sum.ObserveOn(receiveScheduler).Subscribe(v2 =>
{
Console.WriteLine("Received value " + v2 + " on Thread " + Thread.CurrentThread.ManagedThreadId + ".");
receiveThreads.Add(Thread.CurrentThread.ManagedThreadId);
}))
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
Thread.Sleep(150);
s2.OnNext(1);
Thread.Sleep(50);
s1.OnNext(4);
Thread.Sleep(250);
s2.OnNext(4);
Thread.Sleep(150);
s1.OnNext(1);
Thread.Sleep(350);
stopwatch.Stop();
Console.WriteLine("Total Time: " + stopwatch.ElapsedMilliseconds + " ms");
foreach (KeyValuePair<int, int> p in
computeThreads.GroupBy(v => v).Select(g => new KeyValuePair<int, int>(g.Key, g.Count())))
{
Console.WriteLine(p.Value + " computes on Thread " + p.Key);
}
foreach (KeyValuePair<int, int> p in
receiveThreads.GroupBy(v => v).Select(g => new KeyValuePair<int, int>(g.Key, g.Count())))
{
Console.WriteLine(p.Value + " receives on Thread " + p.Key);
}
}
}
}
public void ObservableThreadsWithThrottleOnCompute()
{
Console.WriteLine("Starting Thread " + Thread.CurrentThread.ManagedThreadId);
BehaviorSubject<int> s1 = new BehaviorSubject<int>(2);
BehaviorSubject<int> s2 = new BehaviorSubject<int>(3);
BehaviorSubject<int> sum = new BehaviorSubject<int>(5);
List<int> computeThreads = new List<int>();
List<int> receiveThreads = new List<int>();
IScheduler computeScheduler = new EventLoopScheduler();
IObservable<int> sumObservable = s1.Throttle(TimeSpan.FromMilliseconds(100), computeScheduler).ObserveOn(computeScheduler).CombineLatest(s2.Throttle(TimeSpan.FromMilliseconds(100), computeScheduler).ObserveOn(computeScheduler), (first, second) =>
{
Console.WriteLine("Computing value " + first + " + " + second + " = " + (first + second) + " on Thread " + Thread.CurrentThread.ManagedThreadId + ".");
computeThreads.Add(Thread.CurrentThread.ManagedThreadId);
return first + second;
});
sumObservable.Subscribe(sum.OnNext);
sum.ObserveOn(new EventLoopScheduler()).Subscribe(v =>
{
Console.WriteLine("Received value " + v + " on Thread " + Thread.CurrentThread.ManagedThreadId + ".");
receiveThreads.Add(Thread.CurrentThread.ManagedThreadId);
});
Thread.Sleep(150);
s2.OnNext(1);
Thread.Sleep(50);
s1.OnNext(4);
Thread.Sleep(150);
s2.OnNext(4);
Thread.Sleep(250);
s1.OnNext(1);
Thread.Sleep(150);
foreach (KeyValuePair<int, int> p in
computeThreads.GroupBy(v => v).Select(g => new KeyValuePair<int, int>(g.Key, g.Count())))
{
Console.WriteLine(p.Value + " computes on Thread " + p.Key);
}
foreach (KeyValuePair<int, int> p in
receiveThreads.GroupBy(v => v).Select(g => new KeyValuePair<int, int>(g.Key, g.Count())))
{
Console.WriteLine(p.Value + " receives on Thread " + p.Key);
}
}