About Non-blocking I/O is mean server side NIO?(in spring integration docs)

Question

I'm working with spring integration.
In this link About Non-blocking I/O, is it talking about server side NIO?

I'm using TcpNioClientConnectionFactory(single-use = true) with CachingClientConnectionFactory. that document make me confused.

Answer 1

It applies to both the client and server sides.

Why the confusion? We read and write on both sides.

Without NIO, on the client side with single use, a new thread will be started and stopped for each request/reply; with NIO a pool of threads is used.