Optionally close incoming connection when `Session` is not enabled

[chrjohn]

Follow up to #360 where an incoming connection is rejected via a Logout message when the session is not enabled.

It should also be possible to just close the incoming connection in AcceptorIoHandler when the session's enabled flag is false. Probably it would be best if this was configurable.

quickfixj/quickfixj-core/src/main/java/quickfix/mina/acceptor/AcceptorIoHandler.java

Lines 62 to 69 in 77f21e7

	protected void processMessage(IoSession protocolSession, Message message) throws Exception {
	Session qfSession = (Session) protocolSession.getAttribute(SessionConnector.QF_SESSION);
	if (qfSession == null) {
	final Optional<String> msgTypeField = message.getHeader().getOptionalString(MsgType.FIELD);
	if (msgTypeField.isPresent() && msgTypeField.get().equals(MsgType.LOGON)) {
	final SessionID sessionID = MessageUtils.getReverseSessionID(message);
	qfSession = sessionProvider.getSession(sessionID, eventHandlingStrategy.getSessionConnector());
	if (qfSession != null) {

...

[krisbanas]

Hi, I see this issue is assigned to the 3.0.0 milestone. Is it still relevant? If so, I could have a look.

[chrjohn]

Hi @krisbanas , thanks for your offer. I've moved this to the 3.1.0 milestone now since time is running out for 3.0.0.
But feel free to work on it anyway. :) Much appreciated.

[krisbanas]

Perfect, I'll look into it.

Alternatively, if there's any free task relevant for 3.0.0, I can take that one instead - just let me know :)

[chrjohn]

@krisbanas thank you, there are #1112 and #1118 that would probably need the review of a human. ;) But you could also take one of the other Copilot PRs as well. But those two are most probably still going to 3.0.0.