How to start a external Server from a extension only once?

[jogibear9988]

I need a feature to start a external server only once from a extension, but also when the last instance of the extension is deactivated the server needs to be killed.

Problem is, I can share the PID of the server via context.globalState, but I cannot detect in the "deactivate" if it is the last instance, so I know I need to kill the server.

How is this possible?