public void shutdownExecutor() {
if ( executor!=null && internalExecutor ) {
if ( executor instanceof ThreadPoolExecutor ) {
//this is our internal one, so we need to shut it down
ThreadPoolExecutor tpe = (ThreadPoolExecutor) executor;
tpe.shutdownNow();
long timeout = getExecutorTerminationTimeoutMillis();
if (timeout > 0) {
try {
tpe.awaitTermination(timeout, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {