NOTE
Netty Source: Creating an Accepted NioSocketChannel
Wrapping an accepted socket as a child Channel with pipeline/configuration and parent relationship.
This is a historical learning note and may contain outdated or incomplete understanding.
After the transport accepts a socket, Netty wraps it in a child channel such as a NioSocketChannel. The child obtains its own channel configuration/pipeline and references the parent server channel as appropriate.
The accepted child is not yet ready for normal event handling until its configured initializer/options are applied and it is registered with a child event loop.
Concrete constructors/internal unsafe classes are historical implementation details.