/// <summary>
/// Subscribe a consumer to this observable using delegates.
/// This method is a helper for the IAsyncBatchObservable.SubscribeAsync allowing the subscribing class to inline the
/// handler methods instead of requiring an instance of IAsyncBatchObserver.
/// </summary>
/// <typeparam name="T">The type of object produced by the observable.</typeparam>
/// <param name="obs">The Observable object.</param>
/// <param name="onNextAsync">Delegate that is called for IAsyncBatchObserver.OnNextAsync.</param>
/// <param name="onErrorAsync">Delegate that is called for IAsyncBatchObserver.OnErrorAsync.</param>
/// <param name="onCompletedAsync">Delegate that is called for IAsyncBatchObserver.OnCompletedAsync.</param>
/// <returns>A promise for a StreamSubscriptionHandle that represents the subscription.
/// The consumer may unsubscribe by using this handle.
/// The subscription remains active for as long as it is not explicitly unsubscribed.</returns>
public static Task <StreamSubscriptionHandle <T> > SubscribeAsync <T>(this IAsyncBatchObservable <T> obs,
Func <IList <SequentialItem <T> >, Task> onNextAsync,
Func <Exception, Task> onErrorAsync,
Func <Task> onCompletedAsync)
{
var genericObserver = new GenericAsyncBatchObserver <T>(onNextAsync, onErrorAsync, onCompletedAsync);
return(obs.SubscribeAsync(genericObserver));
}
/// <summary>
/// Resumes consumption of a stream using delegates.
/// This method is a helper for the StreamSubscriptionHandle.ResumeAsync allowing the subscribing class to inline the
/// handler methods instead of requiring an instance of IAsyncBatchObserver.
/// </summary>
/// <typeparam name="T">The type of object produced by the observable.</typeparam>
/// <param name="handle">The subscription handle.</param>
/// <param name="onNextAsync">Delegate that is called for IAsyncObserver.OnNextAsync.</param>
/// <param name="onErrorAsync">Delegate that is called for IAsyncObserver.OnErrorAsync.</param>
/// <param name="onCompletedAsync">Delegate that is called for IAsyncObserver.OnCompletedAsync.</param>
/// <param name="token">The stream sequence to be used as an offset to start the subscription from.</param>
/// <returns>A promise for a StreamSubscriptionHandle that represents the subscription.
/// The consumer may unsubscribe by using this handle.
/// The subscription remains active for as long as it is not explicitly unsubscribed.
/// </returns>
public static Task <StreamSubscriptionHandle <T> > ResumeAsync <T>(this StreamSubscriptionHandle <T> handle,
Func <IList <SequentialItem <T> >, Task> onNextAsync,
Func <Exception, Task> onErrorAsync,
Func <Task> onCompletedAsync,
StreamSequenceToken token = null)
{
var genericObserver = new GenericAsyncBatchObserver <T>(onNextAsync, onErrorAsync, onCompletedAsync);
return(handle.ResumeAsync(genericObserver, token));
}
