Java TCP keep-alive for a master server

Posted by asmo on Stack Overflow See other posts from Stack Overflow or by asmo
Published on 2010-06-02T09:22:13Z Indexed on 2010/06/02 9:23 UTC
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java

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tcp

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keep-alive

Context: Master server (Java, TCP) monitoring a list of hosted games (a different machine for the master server and for each hosted game server). Any user can host a game on his PC. Hosted games can last weeks or months.

Need: Knowing when hosted game servers are closed or no longer reachable.

Restriction 1: Can't rely on hosted servers' "gone offline update message", since those messages may never arrive (power down, Internet link cut, etc.)

Restriction 2: I'm not sure about TCP's built-in keep-alive, since it would mean a 24/7 open socket with each hosted server (correct me if I'm wrong)

Any thoughts?

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