Hi, in Apache MINA sshd I recently[1] ran into the problem of how to shut down output on a socket using MINA 2.0.23. Apache MINA sshd had some code that used reflection to get at the SocketChannel of an NioSocketSession, and then invoked channel.shutdownOutput() on that directly.
That kind of worked, but it led to very strange effects where all SSH tests, when run with MINA, took very long. (Unfortunately I don't know for sure why because I never could reproduce this locally and the Apache MINA sshd CI builds on Github don't provide any useful logs after the build has terminated.) I did notice in some local tests that quite frequently the AbstractPollingIoProcessor.Processor entered its "epoll spinning" code; so maybe that was the reason. In any case: what's the proper way to half-close an NioSocketSession? With NIO2, it's no problem. Netty also has a proper DuplexChannel abstraction via which we can do this. But with MINA, the only working way for Apache MINA sshd is to call IoSession.closeOnFlush(). That works for our use case, but it isn't quite the same as a half-closure via shutdownOutput(). On a related note: what is the proper way in Apache MINA to handle IoHandler.inputClosed()? As I understand it, that indicates that whatever is on the other end closed its output. But we may still write, right? IoHandlerAdapter just closes the session immediately, though. I tried to use IoSession.suspendRead(), but that again leads to epoll spinning. Just not closing session (i.e., an empty implementation of inputClosed()) leads to ClosedByInterruptExceptions when the session finally is closed. Any hints? Cheers, Thomas [1] https://github.com/apache/mina-sshd/pull/227 --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@mina.apache.org For additional commands, e-mail: users-h...@mina.apache.org
