android - identify which clients get disconnected using java NIO -

i have created sample of java nio , created server different clients connected.

now issue want track how many clients connected on socket. example ,

if , b , c , d connected server s1 if b , c got disconnected s1 come know these clients got disconnected through java nio apis.

if client disconnects cleanly, socketchannel client become readable , read() return -1.

if connection aborted, way can detect writing , getting subsequent ioexception.