public void run() {
Event event = request.getEvent();
if (logger.isDebugEnabled())
logger.debug("Processing event: " + event.getClass().getSimpleName());
EventStatus status = null;
try {
if (request.isCancelRequested()) {
// If the event is cancelled note it.
status = new EventStatus(false, true, null);
if (logger.isDebugEnabled())
logger.debug("Skipped cancelled event: " + event.getClass().getSimpleName());
} else {
// Mark the request as started and submit to state machine.
request.started();
sm.applyEvent(event);
status = new EventStatus(true, false, null);
if (logger.isDebugEnabled())
logger.debug("Applied event: " + event.getClass().getSimpleName());
}
} catch (InterruptedException e) {
// Handle an interruption, which could happen if we are cancelled
// while executing.
status = new EventStatus(false, true, e);
logger.debug(
String.format("Failed to apply event %s, reason=%s", event, e.getLocalizedMessage()));
} catch (Throwable e) {
// Handle a failure.
status = new EventStatus(false, false, e);
logger.debug(
String.format("Failed to apply event %s, reason=%s", event, e.getLocalizedMessage()));
} finally {
// We need to store the status and call the completion
// listener, if any. This must happen regardless of any
// exception that occurs.
try {
if (listener != null) request.setAnnotation(listener.onCompletion(event, status));
} catch (InterruptedException e) {
// Do nothing; this is the end of the road for this task.
} catch (Throwable e) {
logger.error("Unexpected failure while calling listener", e);
} finally {
// Make sure we record the request state no matter what to
// prevent hangs.
request.setStatus(status);
}
}
}
