@Override
public void dispatch(final Message msg) {
if (msg != null) {
final MessageHandler handler = msg.getMessageHandler();
final NonBlockingSession session = (NonBlockingSession) handler;
final MessageQueue queue = session.getSendQueue();
if (queue != null) {
queue.add(msg);
} else {
// should NEVER happen
ReusableString s = TLC.instance().pop();
s.copy(((Session) handler).getComponentId())
.append(": Missing Queue, unable to dispatch : ");
msg.dump(s);
_log.error(MISSING_HANDLER, s);
TLC.instance().pushback(s);
}
}
}
// @NOTE keep flush private the preQ is not threadsafe
private void flush(SessionWrapper sessW) {
// disconnected drop any session messages
// optionally keep any other messages or reject back upstream
final Session session = sessW._session;
final MessageQueue queue = sessW._queue;
final MessageQueue preQ = sessW._preQueue;
final MessageQueue syncQ = sessW._syncQueue;
while (!syncQ.isEmpty()) {
syncQ.next(); // DISCARD
}
Message head = null;
Message tail = null;
while (!queue.isEmpty()) {
Message msg = queue.next();
if (msg.getReusableType() == CoreReusableType.NullMessage) break;
if (session.discardOnDisconnect(msg) == false) {
if (session.rejectMessageUpstream(msg, DISCONNECTED)) {
// message recycled by successful reject processing
} else {
if (tail == null) {
head = msg;
tail = msg;
} else {
tail.attachQueue(msg);
tail = msg;
}
}
} else {
_logMsg.copy(DROP_MSG).append(msg.getReusableType().toString());
_log.info(_logMsg);
session.outboundRecycle(msg);
}
}
// move remaining messages to the preQ
if (head != null) {
Message tmp = head;
while (tmp != null) {
Message next = tmp.getNextQueueEntry();
tmp.detachQueue();
preQ.add(tmp);
tmp = next;
}
}
}
@Override
public void execute() throws Exception {
_curSessW = _sessions[_nextSession];
final MessageQueue queue = _curSessW._queue;
final MessageQueue preQueue = _curSessW._preQueue;
final NonBlockingSession sess = _curSessW._session;
if (++_nextSession >= _sessions.length) _nextSession = 0;
if (_curSessW._connected && sess.canHandle()) {
if (sess.isLoggedIn()) {
if (sess.isMsgPendingWrite()) {
sess.retryCompleteWrite();
} else if (preQueue.isEmpty()) {
_curMsg = queue.poll(); // POLL = non blocking, causes MEM_READ barrier
if (_curMsg != null && _curMsg.getReusableType() != CoreReusableType.NullMessage) {
sess.handleNow(_curMsg);
}
} else { // QUEUED MESSAGES FROM PREVIOUS FLUSH CALLS
_curMsg = preQueue.next();
if (_curMsg.getReusableType() != CoreReusableType.NullMessage) {
sess.handleNow(_curMsg);
}
}
} else { // SYNC mode
final MessageQueue syncQueue = _curSessW._syncQueue;
if (sess.isMsgPendingWrite()) {
sess.retryCompleteWrite();
} else if (!syncQueue.isEmpty()) {
_curMsg = syncQueue.next();
if (_curMsg.getReusableType() != CoreReusableType.NullMessage) {
sess.handleNow(_curMsg);
}
}
}
} else {
flush(_curSessW);
}
}
@Override
public void dispatchForSync(Message msg) {
if (msg != null) {
final MessageHandler handler = msg.getMessageHandler(); // cant be null
NonBlockingSession session = (NonBlockingSession) handler;
MessageQueue queue = session.getSendSyncQueue();
if (queue != null) {
queue.add(msg);
} else {
// @TODO add ReusableString write( ReusableString buf ) to Message and log details
// should NEVER happen
_log.error(MISSING_HANDLER, ((Session) handler).getComponentId());
}
}
}
@Override
public void handleExecutionException(Exception ex) {
final NonBlockingSession sess = _curSessW._session;
if (_curMsg != null && sess != null) {
_log.warn(
"SessionThreadedDispatcher "
+ getComponentId()
+ ", msgSeqNum="
+ _curMsg.getMsgSeqNum()
+ ", sess="
+ sess.getComponentId()
+ " exception "
+ ex.getMessage());
}
flush(_curSessW);
// some problem, possibly disconnect, poke controller to wake up anything waiting on controller
// passive lock
_ctl.statusChange(); // Mem barrier
}