/// <summary>
/// Subscribes to notifications produced by an observable object
/// </summary>
/// <typeparam name="TSource">The type of notification</typeparam>
/// <param name="source">The observable source</param>
/// <param name="handleNext">(Optional) An action delegate that will be
/// invoked when the next notification is produced by the observable object</param>
/// <param name="handleComplete">(Optional) An action delegate that will be
/// invoked when all notifications have been produced</param>
/// <param name="handleError">(Optional) An action delegate that will be
/// invoked when an error notification is produced by the observable object</param>
/// <returns>Returns a disposable object representing the subscription which,
/// when disposed, will terminate the subscription</returns>
public static IDisposable Subscribe <TSource>(this IObservable <TSource> source, Action <TSource> handleNext,
Action handleComplete = null, Action <Exception> handleError = null)
{
var observer = new DelegateObserver <TSource>(handleNext, handleComplete, handleError);
return(source.Subscribe(observer));
}
public void CallOnNext()
{
string test = null;
var observer = new DelegateObserver <string>(s => test = s);
observer.OnNext(TEST);
test.Is(TEST);
}
public void executeAsync(object param, DelegateObserver observer)
{
this.mDelegateObserver = observer;
Thread thread = new Thread(doExecute);
thread.Start(param);
}
public void CallOnCompleted()
{
string completeMessage = null;
var observer = new DelegateObserver <string>(null, onCompleted: () => completeMessage = TEST);
observer.OnCompleted();
completeMessage.Is(TEST);
}
public void CallOnError()
{
Exception testExp = null;
var observer = new DelegateObserver <string>(null, onError: exception => testExp = exception);
observer.OnError(new NotImplementedException(TEST));
testExp.IsInstanceOf <NotImplementedException>();
(testExp as NotImplementedException)?.Message.Is(TEST);
}
public void NoSpecifiedDelegates()
{
var testObservable = new OnDemandObservable <int>();
var observer = new DelegateObserver <int>();
testObservable.Subscribe(observer);
testObservable.OnNext(1);
testObservable.OnError(new ArgumentException());
testObservable.OnCompleted();
}
public void ConstructorWithParameter()
{
var subject = new DelegateObserver <int>();
IDisposable exec(IObserver <int> o)
{
subject.Next += o.OnNext;
subject.Error += o.OnError;
subject.Completed += o.OnCompleted;
return(new DelegateDisposable(() =>
{
subject.Next -= o.OnNext;
subject.Error -= o.OnError;
subject.Completed -= o.OnCompleted;
}));
}
var observable = new DelegateObservable <int>(exec);
int next = 0;
Exception exception = null;
bool completed = false;
var observer = new DelegateObserver <int>(i => next = i, eee => exception = eee, () => completed = true);
var disposer = observable.Subscribe(observer);
subject.OnNext(3);
subject.OnError(new ArgumentNullException(TEST));
subject.OnCompleted();
// assert
next.Is(3);
exception.IsInstanceOf <ArgumentNullException>();
(exception as ArgumentNullException)?.ParamName.Is(TEST);
completed.IsTrue();
next = 0;
exception = null;
completed = false;
// release subscribe.
disposer.Dispose();
subject.OnNext(3);
subject.OnError(new ArgumentOutOfRangeException(TEST));
subject.OnCompleted();
next.Is(0);
exception.IsNull();
completed.IsFalse();
}
public void ImplicitReleaseByLostObserver()
{
int onnext = 0;
Exception e = null;
bool isCompleted = false;
var observable = new OnDemandObservable <int>();
IDisposable disposable = null;
WeakReference <IObserver <int> > weak = null;
void exec()
{
var o = new DelegateObserver <int>(i => onnext += i, ex => e = ex, () => { isCompleted = true; });
disposable = observable.AsWeakObservable().Subscribe(o);
weak = new WeakReference <IObserver <int> >(o, true);
};
// execute inner method.
exec();
observable.OnNext(3);
onnext.Is(3);
observable.OnError(E);
e.IsNotNull();
observable.OnCompleted();
isCompleted.IsTrue();
// reset values.
e = null;
isCompleted = false;
// Force GC.
GC.Collect(0, GCCollectionMode.Forced);
GC.WaitForPendingFinalizers();
GC.Collect(0, GCCollectionMode.Forced); // just to be sure
System.Threading.Tasks.Task.Delay(100).Wait();
// It should be notified. Because reference of IDisposable is alive and not unsubscribe automatically,
// and so subscription is valid. Reference of IObserver<T> is kept internally, and was not collected by
// the garbage collector.
observable.OnNext(6);
onnext.Is(9);
observable.OnError(E);
e.IsNotNull();
observable.OnCompleted();
isCompleted.IsTrue();
}
public void ImplicitReleaseByLostObserver()
{
int onnext = 0;
Exception e = null;
bool isCompleted = false;
var observable = new OnDemandObservable <int>();
IDisposable disposable = null;
WeakReference <IObserver <int> > weak = null;
void exec()
{
var o = new DelegateObserver <int>(i => onnext += i, ex => e = ex, () => { isCompleted = true; });
disposable = observable.VeryWeakSubscribe(o);
weak = new WeakReference <IObserver <int> >(o, true);
};
// execute inner method.
exec();
observable.OnNext(3);
onnext.Is(3);
observable.OnError(E);
e.IsNotNull();
observable.OnCompleted();
isCompleted.IsTrue();
// reset values.
e = null;
isCompleted = false;
// Force GC.
GC.Collect(0, GCCollectionMode.Forced);
GC.WaitForPendingFinalizers();
GC.Collect(0, GCCollectionMode.Forced); // just to be sure
System.Threading.Tasks.Task.Delay(100).Wait();
observable.OnNext(6);
onnext.Is(3); // it should not be notified.
observable.OnError(E);
e.IsNull();
observable.OnCompleted();
isCompleted.IsFalse();
}
private static void DelegateSample()
{
DelegateObserver observer = new DelegateObserver();
// задаём коллбэк одновременно специфицируя и объект, на котором вызывать, и метод, который вызывать.
// всё это хранится в инстансе MulticastDelegate
DelegateNotifier notifier = new DelegateNotifier(observer.CallbackMethod);
// сейчас нотификатор уведомит наблюдателя, вызывая коллбэк.
notifier.NotifyAfterTimeout(2000);
Console.Read();
// нотификатор ничего не знает о наблюдателе. Мы используем посредника (класс Program), чтобы организовать взаимодействие
// наблюдаемого объекта и наблюдателя.
}
public void SpecifyFull()
{
int t = 0;
bool completed = false;
Exception ee = null;
var testObservable = new OnDemandObservable <int>();
var observer = new DelegateObserver <int>(i => t = i, exception => ee = exception, () => completed = true);
testObservable.Subscribe(observer);
testObservable.OnNext(1);
t.Is(1);
testObservable.OnError(new Exception());
ee.IsNotNull();
testObservable.OnCompleted();
completed.IsTrue();
}
public void DelegateObserver_Disposed_Does_Not_Send_OnComplete()
{
int result = -1;
var b = new DelegateObserver <int>(
i =>
{
},
exception =>
{
},
() =>
{
result = 1;
});
b.Dispose();
Assert.True(b.IsDisposed);
Assert.Equal(-1, result);
}
public void SetNull()
{
var subject = new DelegateObserver <int>();
IDisposable exec(IObserver <int> o)
{
subject.Next += o.OnNext;
subject.Error += o.OnError;
subject.Completed += o.OnCompleted;
return(new DelegateDisposable(() =>
{
subject.Next -= o.OnNext;
subject.Error -= o.OnError;
subject.Completed -= o.OnCompleted;
}));
}
var observable = new DelegateObservable <int>(exec);
int next = 0;
Exception exception = null;
bool completed = false;
var observer = new DelegateObserver <int>(i => next = i, eee => exception = eee, () => completed = true);
var disposer = observable.Subscribe(observer);
// Since it should be related to the subject, it should react even if replacing delegate.
observable.DelegateOfSubscribe = null;
subject.OnNext(6);
next.Is(6);
subject.OnError(new ArgumentNullException(TEST));
exception.IsInstanceOf <ArgumentNullException>();
(exception as ArgumentNullException)?.ParamName.Is(TEST);
subject.OnCompleted();
completed.IsTrue();
}
public void KeepReferences()
{
int onnext = 0;
Exception e = null;
bool isCompleted = false;
var observable = new OnDemandObservable <int>();
var observer = new DelegateObserver <int>(i => onnext += i, ex => e = ex, () => { isCompleted = true; });
var dispose = observable.WeakSubscribe(observer);
// observer = null;
observable.OnNext(3);
onnext.Is(3);
observable.OnError(E);
e.IsNotNull();
observable.OnCompleted();
isCompleted.IsTrue();
// reset values.
e = null;
isCompleted = false;
// Force GC.
GC.Collect(0, GCCollectionMode.Forced);
GC.WaitForPendingFinalizers();
GC.Collect(0, GCCollectionMode.Forced); // just to be sure.
System.Threading.Tasks.Task.Delay(100).Wait();
observable.OnNext(6);
onnext.Is(9); // it should be notified.
observable.OnError(E);
e.IsNotNull();
observable.OnCompleted();
isCompleted.IsTrue();
}
public void ManySubscriber()
{
var subject = new DelegateObserver <int>();
IDisposable exec(IObserver <int> o)
{
subject.Next += o.OnNext;
subject.Error += o.OnError;
subject.Completed += o.OnCompleted;
return(new DelegateDisposable(() =>
{
subject.Next -= o.OnNext;
subject.Error -= o.OnError;
subject.Completed -= o.OnCompleted;
}));
}
var observable = new DelegateObservable <int>();
observable.DelegateOfSubscribe = exec;
int next1 = 0;
Exception exception1 = null;
bool completed1 = false;
var observer1 = new DelegateObserver <int>(i => next1 = i, eee => exception1 = eee, () => completed1 = true);
var disposer1 = observable.Subscribe(observer1);
int next2 = 0;
Exception exception2 = null;
bool completed2 = false;
var observer2 = new DelegateObserver <int>(i => next2 = i, eee => exception2 = eee, () => completed2 = true);
var disposer2 = observable.Subscribe(observer2);
// onNext
subject.OnNext(3);
next1.Is(3);
next2.Is(3);
// onError
subject.OnError(new ArgumentOutOfRangeException(TEST));
exception1.IsInstanceOf <ArgumentOutOfRangeException>();
(exception1 as ArgumentOutOfRangeException)?.ParamName.Is(TEST);
exception2.IsInstanceOf <ArgumentOutOfRangeException>();
(exception2 as ArgumentOutOfRangeException)?.ParamName.Is(TEST);
// onComplete
subject.OnCompleted();
completed1.IsTrue();
completed2.IsTrue();
// re-initialize
next1 = 0;
exception1 = null;
completed1 = false;
next2 = 0;
exception2 = null;
completed2 = false;
// disposing only disposer1.
disposer1.Dispose();
subject.OnNext(6);
next1.Is(0);
next2.Is(6);
subject.OnError(new NotSupportedException(TEST));
exception1.IsNull();
//
exception2.IsInstanceOf <NotSupportedException>();
(exception2 as NotSupportedException)?.Message.Is(TEST);
subject.OnCompleted();
completed1.IsFalse();
completed2.IsTrue();
}
