2010/8/17 Delos <[email protected]> > > 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
