/// <summary>
/// Returns a promise that resolves when all of the promises in the enumerable argument have resolved.
/// Returns a promise of a collection of the resolved results.
/// </summary>
public static IPromise <IEnumerable <PromisedT> > All(IEnumerable <IPromise <PromisedT> > promises)
{
var promisesArray = promises.ToArray();
if (promisesArray.Length == 0)
{
return(Promise <IEnumerable <PromisedT> > .Resolved(LinqExts.Empty <PromisedT>()));
}
var remainingCount = promisesArray.Length;
var results = new PromisedT[remainingCount];
var resultPromise = new Promise <IEnumerable <PromisedT> >();
promisesArray.Each((promise, index) =>
{
promise
.Catch(ex =>
{
if (resultPromise.CurState == PromiseState.Pending)
{
// If a promise errorred and the result promise is still pending, reject it.
resultPromise.Reject(ex);
}
})
.Then(result =>
{
results[index] = result;
--remainingCount;
if (remainingCount <= 0)
{
// This will never happen if any of the promises errorred.
resultPromise.Resolve(results);
}
})
.Done();
});
return(resultPromise);
}
