/// <summary>
/// Timed Retry
/// Calls tryFunction, if an exception is thrown it will re-attempt with a delay.
/// Before each retry, the retryFunction is called with the retry number and exception and will throw if it returns false.
/// </summary>
/// <typeparam name="R"></typeparam>
/// <param name="tryFunction"></param>
/// <param name="retryFunction"></param>
/// <param name="retries"></param>
/// <param name="delay"></param>
/// <returns></returns>
public static R TimedRetry <R>(Func <R> tryFunction, Func <int, Exception, bool> retryFunction, RetrySettings settings)
{
R result = default(R);
int retryCount = 0;
int delay = settings.Delay;
bool retry = false;
do
{
try
{
result = tryFunction();
retry = false;
}
catch (Exception e)
{
if (Logger.IsWarnEnabled)
{
Logger.Warn("Exception caught with retry [" + retryCount + "/" + settings.NumberRetries + "]");
}
retry = retryCount++ < settings.NumberRetries;
// do retry if within limit and retry function returns true
if (!retry || !retryFunction(retryCount, e))
{
throw;
}
if (delay > 0)
{
ThreadUtil.Await(delay);
}
// increment delay if factor supplied
if (settings.DelayFactor != null)
{
delay *= settings.DelayFactor.Value;
}
}
} while (retry);
return(result);
}
/// <summary>
/// Timed Retry
/// Calls tryAction, if an exception is thrown it will re-attempt with a delay.
/// Before each retry, the retryFunction is called with the retry number and exception and will throw if it returns false.
/// </summary>
/// <typeparam name="R"></typeparam>
/// <param name="tryAction"></param>
/// <param name="retryFunction"></param>
/// <param name="retries"></param>
/// <param name="delay"></param>
/// <returns></returns>
public static void TimedRetry(Action tryAction, Func <int, Exception, bool> retryFunction, RetrySettings settings)
{
TimedRetry <object>(() => { tryAction(); return(null); }, retryFunction, settings);
}
