/** Write all the pending messages */
private void flush(long currentTime) {
if (flushingSessions.isEmpty()) {
return;
}
do {
S session = flushingSessions.poll(); // the same one with firstSession
if (session == null) {
// Just in case ... It should not happen.
break;
}
// Reset the Schedule for flush flag for this session,
// as we are flushing it now
session.unscheduledForFlush();
SessionState state = getState(session);
switch (state) {
case OPENED:
try {
boolean flushedAll = flushNow(session, currentTime);
if (flushedAll
&& !session.getWriteRequestQueue().isEmpty(session)
&& !session.isScheduledForFlush()) {
scheduleFlush(session);
}
} catch (Exception e) {
scheduleRemove(session);
IoFilterChain filterChain = session.getFilterChain();
filterChain.fireExceptionCaught(e);
}
break;
case CLOSING:
// Skip if the channel is already closed.
break;
case OPENING:
// Retry later if session is not yet fully initialized.
// (In case that Session.write() is called before addSession()
// is processed)
scheduleFlush(session);
return;
default:
throw new IllegalStateException(String.valueOf(state));
}
} while (!flushingSessions.isEmpty());
}
