Method: PhusionPassenger::Standalone::AppFinder#monitor

Defined in:
lib/phusion_passenger/standalone/app_finder.rb

#monitor(termination_pipe) ⇒ Object 



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# File 'lib/phusion_passenger/standalone/app_finder.rb', line 77

def monitor(termination_pipe)
	raise "You must call #scan first" if !@apps
	
	watcher = PhusionPassenger::Utils::FileSystemWatcher.new(@watchlist, termination_pipe)
	if wait_on_io(termination_pipe, 3)
		return
	end
	
	while true
		changed = watcher.wait_for_change
		watcher.close
		if changed
			old_apps = @apps
			# The change could be caused by a write to some passenger.conf file.
			# Wait for a short period so that the write has a chance to finish.
			if wait_on_io(termination_pipe, 0.25)
				return
			end
			
			new_apps = scan
			watcher = PhusionPassenger::Utils::FileSystemWatcher.new(@watchlist, termination_pipe)
			if old_apps != new_apps
				yield(new_apps)
			end
			
			# Don't process change events again for a short while,
			# but do detect changes while waiting.
			if wait_on_io(termination_pipe, 3)
				return
			end
		else
			return
		end
	end
ensure
	watcher.close if watcher
end