private static IPromise AllInternal(ICollection <IPromise> collection)
{
Deferred deferred = Deferred.GetFromPool();
if (collection.Count == 0)
{
deferred.Resolve();
}
else
{
int promisesToComplete = collection.Count;
foreach (IPromise element in collection)
{
element.Done(() =>
{
promisesToComplete--;
if (deferred.CurrentState == States.Pending && promisesToComplete == 0)
{
deferred.Resolve();
}
});
element.Fail(ex =>
{
if (deferred.CurrentState == States.Pending)
{
deferred.Reject(ex);
}
});
}
}
return(deferred);
}
/// <summary>
/// Resolves when any in IPromise array is resolved
/// Fails if all in IPromise array are failed
/// </summary>
/// <param name="collection">promises to complete</param>
/// <returns>IPromise</returns>
public static IPromise Race(params IPromise[] collection)
{
Deferred deferred = Deferred.GetFromPool();
if (collection.Length == 0)
{
deferred.Reject(new Exception("Deferred.Race called with empty array - no winner"));
}
else
{
int promisesToWait = collection.Length;
for (int i = 0, maxi = collection.Length - 1; i <= maxi; i++)
{
collection[i].Done(() =>
{
if (deferred.CurrentState == States.Pending)
{
deferred.Resolve();
}
});
collection[i].Fail(ex =>
{
promisesToWait--;
if (deferred.CurrentState == States.Pending && promisesToWait == 0)
{
deferred.Reject(ex);
}
});
}
}
return(deferred);
}
/// <summary>
/// adds new promise constructor to current promise and returns wrapper that resolves with added promise
/// A.Then(B) - returns promise that resolves when promise from B is resolved
/// </summary>
/// <param name="next">constructor for next promise</param>
/// <returns>Promise</returns>
public IPromise Then(Func <IPromise> next)
{
Deferred deferred = Deferred.GetFromPool();
Done(() =>
{
IPromise promise = next();
promise.Done(() => deferred.Resolve());
promise.Fail(ex => deferred.Reject(ex));
});
Fail(ex => deferred.Reject(ex));
return(deferred);
}