How to close a non blocking socket channel properly?

Question

I'm writing a server program using Java non-blocking SocketChannel. Sometimes I want to send a reply message and then close the channel, like the following code.

However, the close() method interrupts the write() method, I get a java.nio.channels.ClosedChannelException and the message is not sent.

I can pop a thread and wait for 1-2 seconds before closing the channel, but I feel it's so wasteful to making another thread.

What is the proper way to close a SocketChannel while there are pending operations?

String msg = "Wrong password!";
channel.write(ByteBuffer.wrap(msg.getBytes()));
channel.close();

Answer 1

channel. socket (). setSoLinger (true, MAX_SECONDS_FOR_OUTPUT_TO_DRAIN);

See info on the linger option . As mentioned, it will cause close() to block for up to MAX_SECONDS_FOR_OUTPUT_TO_DRAIN seconds.