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From Donald Woods <>
Subject Re: [DISCUSSION] How to detect status of server instance?
Date Wed, 18 Aug 2010 02:52:43 GMT
Will file locking work across all OS and filesystem combinations
reliably?  Wondering about Windows/exFAT and Unix/NFS shares....

Another way is to use *.pid files to hold the server process id or
something like *.rmi or *.jmx files to denote the ports that servers are
listening on.

Maybe building something into the Felix shell to track instances would
be another solution?


On 8/17/10 9:37 PM, Delos wrote:
> 2010/8/17 Delos < <>>
>     For some reasons, we often need to know if there is a running server
>     instance. By establishing a connection to a specific port such as
>     1099,  we may get the status of server. However, the method doesn't
>     work if default port number is changed, especially in
>     multi-instances scenario. In multi-instances scenario, we hope to
>     know if any instance is running.
>     Below is my thoughts about the solution. Any comments or
>     suggestions, please feel free to tell me. It will be appreciated if
>     any better solution could be provided.
>     Possible solution:
>     We may create flag file for each instance and lock the file with
>     FileChannel.lock()  when a server instance is starting up. It will
>     be unlocked and deleted when the server is stopped. Unlocking will
>     be automatically done when JVM exits; deleting the file can be done
>     in shutdown hook in FrameworkLauncher.launch().
>     In this way, if any flag file has been locked, we may deduce that
>     there is at least one running server instance; if no locked files
>     found, we may think all server instances are stopped. We can put all
>     the flag files in a same directory for us to track.
>     -- 
>     Best Regards,
>     Delos
> -- 
> Best Regards,
> Delos

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