public static IObservable <T> BackOffAndRetry <T>(
this IObservable <T> source,
Func <int, TimeSpan> strategy,
Func <int, Exception, bool> retryOnError)
{
return(source.BackOffAndRetry(strategy, retryOnError, 0));
}
private static IObservable <T> BackOffAndRetry <T>(
this IObservable <T> source,
Func <int, TimeSpan> strategy,
Func <int, Exception, bool> retryOnError,
int attempt)
{
return(Observable
.Defer(() =>
{
var delay = attempt == 0 ? TimeSpan.Zero : strategy(attempt);
var s = delay == TimeSpan.Zero ? source : source.DelaySubscription(delay);
return s
.Catch <T, Exception>(e =>
{
if (retryOnError(attempt, e))
{
return source.BackOffAndRetry(strategy, retryOnError, attempt + 1);
}
return Observable.Throw <T>(e);
});
}));
}
