/// <summary>
/// Invokes specified invoker inside a loop with try-catch/everything and retries until reaches timeout or until each of the following is true:
/// - The invoker does not throw exception.
/// - If the additional condition delegate is specified, it must return true.
/// </summary>
/// <param name="invoker">The method to invoke</param>
/// <param name="stopCondition">If specified, to break from the loop, it must be true. The condition delegate must not throw.</param>
/// <param name="timeout">Timeout to stop retries after.</param>
/// <returns>True on success, false on timeout.</returns>
private bool InvokeWithRetry(MethodInvoker invoker, BoolMethodInvoker stopCondition, TimeSpan timeout)
{
Debug.Assert(invoker != null);
Stopwatch timer = Stopwatch.StartNew();
bool hasTimedOut = true;
try
{
do
{
bool isExceptionThrown = false;
try
{
invoker.Invoke();
}
catch
{
isExceptionThrown = true;
}
// If there was no exception, also check for stop condition.
// Note: condition.Invoke() must not throw. If it throws, we also throw from here.
if (!isExceptionThrown &&
(stopCondition == null || stopCondition.Invoke()))
{
hasTimedOut = false;
break;
}
Thread.Sleep(RegistrySettings.BaseSleepDuration); // This is to prevent 100% CPU consumption.
} while (timer.Elapsed < timeout);
}
finally
{
timer.Stop();
}
return !hasTimedOut;
}
/// <summary>
/// Invokes specified invoker inside a loop with try-catch/everything and retries until reaches timeout or until each of the following is true:
/// - The invoker does not throw exception.
/// - If the additional condition delegate is specified, it must return true.
/// </summary>
/// <param name="invoker">The method to invoke</param>
/// <param name="stopCondition">If specified, to break from the loop, it must be true. The condition delegate must not throw.</param>
/// <param name="timeout">Timeout to stop retries after.</param>
/// <returns>True on success, false on timeout.</returns>
private bool InvokeWithRetry(MethodInvoker invoker, BoolMethodInvoker stopCondition, TimeSpan timeout)
{
Debug.Assert(invoker != null);
Stopwatch timer = Stopwatch.StartNew();
bool hasTimedOut = true;
try
{
do
{
bool isExceptionThrown = false;
try
{
invoker.Invoke();
}
catch
{
isExceptionThrown = true;
}
// If there was no exception, also check for stop condition.
// Note: condition.Invoke() must not throw. If it throws, we also throw from here.
if (!isExceptionThrown &&
(stopCondition == null || stopCondition.Invoke()))
{
hasTimedOut = false;
break;
}
Thread.Sleep(RegistrySettings.BaseSleepDuration); // This is to prevent 100% CPU consumption.
} while (timer.Elapsed < timeout);
}
finally
{
timer.Stop();
}
return(!hasTimedOut);
}
