baseimage-tutorial-framework/lib/tfw/components/process_managing_event_handler.py

from tfw.event_handler_base import EventHandlerBase
from tfw.components.mixins import SupervisorMixin


class ProcessManager(SupervisorMixin):
    def __init__(self, supervisor_process_name):
        self.process_name = supervisor_process_name
        self.commands = {'start': self.start_process,
                         'stop': self.stop_process,
                         'restart': self.restart_process}

    def __call__(self, command):
        self.commands[command]()


class ProcessManagingEventHandler(EventHandlerBase):
    def __init__(self, anchor, supervisor_process_name):
        super().__init__(anchor)
        self.processmanager = ProcessManager(supervisor_process_name)

    def handle_event(self, anchor, data_json):
        self.processmanager(data_json['data']['command'])