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From Delos <>
Subject [DISCUSSION] How to detect status of server instance?
Date Wed, 18 Aug 2010 01:37:52 GMT
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,


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