/// <summary>
/// Subscribe a consumer to this observable using delegates.
/// This method is a helper for the IAsyncObservable.SubscribeAsync allowing the subscribing class to inline the
/// handler methods instead of requiring an instance of IAsyncObserver.
/// </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 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>
/// <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 IAsyncObservable <T> obs,
Func <T, StreamSequenceToken, Task> onNextAsync,
Func <Exception, Task> onErrorAsync,
Func <Task> onCompletedAsync)
{
var genericObserver = new GenericAsyncObserver <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 IAsyncObserver.
/// </summary>
/// <typeparam name="T">The type of object produced by the observable.</typeparam>
/// <param name="obs">The Observable object.</param>
/// <param name="onNextAsync">Delegte that is called for IAsyncObserver.OnNextAsync.</param>
/// <param name="onErrorAsync">Delegte that is called for IAsyncObserver.OnErrorAsync.</param>
/// <param name="onCompletedAsync">Delegte 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 explicitely unsubscribed.
/// </returns>
public static Task <StreamSubscriptionHandle <T> > ResumeAsync <T>(this StreamSubscriptionHandle <T> handle,
Func <T, StreamSequenceToken, Task> onNextAsync,
Func <Exception, Task> onErrorAsync,
Func <Task> onCompletedAsync,
StreamSequenceToken token = null)
{
var genericObserver = new GenericAsyncObserver <T>(onNextAsync, onErrorAsync, onCompletedAsync);
return(handle.ResumeAsync(genericObserver, token));
}
/// <summary>
/// Subscribe a consumer to this observable using delegates.
/// This method is a helper for the IAsyncObservable.SubscribeAsync allowing the subscribing class to inline the
/// handler methods instead of requiring an instance of IAsyncObserver.
/// </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 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>
/// <param name="filterFunc">Filter to be applied for this subscription</param>
/// <param name="filterData">Data object that will be passed in to the filterFunc.
/// This will usually contain any parameters required by the filterFunc to make it's filtering decision.</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>
/// <exception cref="ArgumentException">Thrown if the supplied stream filter function is not suitable.
/// Usually this is because it is not a static method. </exception>
public static Task <StreamSubscriptionHandle <T> > SubscribeAsync <T>(this IAsyncObservable <T> obs,
Func <T, StreamSequenceToken, Task> onNextAsync,
Func <Exception, Task> onErrorAsync,
Func <Task> onCompletedAsync,
StreamSequenceToken token,
StreamFilterPredicate filterFunc = null,
object filterData = null)
{
var genericObserver = new GenericAsyncObserver <T>(onNextAsync, onErrorAsync, onCompletedAsync);
return(obs.SubscribeAsync(genericObserver, token, filterFunc, filterData));
}