[ajug-members] checking for server availability

[Paul McKibben]

Are you trying to verify (1) that a physical server machine is up and
running and reachable on the network, or (2) that a particular server
process is running and able to respond to messages?

For (1), you could try InetAddress.isReachable() -- I believe you need Java
5 or later.

For (2), your current approach is your best bet.  If you can, have the
server process respond to a simple "Are you there" message.  As long as you
aren't doing this for a large number of different servers or processes, and
assuming the heartbeat frequency is reasonable (e.g. no more frequent than 5
or 10 seconds), I wouldn't worry too much about message overhead.

HTH,
  Paul

On 4/6/07, Barnes, Mike <mike.barnes at cingular.com> wrote:
>
>  Is there a way to ping a host/port to see if it is available? I need to
> set up a heartbeat process and would like to do it as cheaply as possible
> (network time). The current way we are doing this is to send a known message
> to the server and wait for a response, I am not sure that this is the best
> way to check if a server is up or not.
>
>
>
> Thanks
>
> Mike Barnes
>
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