Read timeout for an NIO SocketChannel?

java nio socketchannel
Sam picture Sam · Jun 27, 2013 · Viewed 12.9k times · Source

What is the best way to set a timeout to close a NIO SocketChannel if there is no data is received for a certain period after the connection is established?

Answer

user207421 picture user207421 · Jun 27, 2013

Either:

  1. You are using a Selector, in which case you have a select timeout which you can play with, and if it goes off (select(timeout) returns zero) you close all the registered channels, or

  2. You are using blocking mode, in which case you might think you should be able to call Socket.setSoTimeout() on the underlying socket (SocketChannel.socket()), and trap the SocketTimeoutException that is thrown when the timeout expires during read(), but you can't, because it isn't supported for sockets originating as channels, or

  3. You are using non-blocking mode without a Selector, in which case you need to change to case (1).

So you either need to use case (1) or a java.net.Socket directly.

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