Implement ProcessManagingEventHandler

lib/tfw/components/process_managing_event_handler.py

@@ -0,0 +1,15 @@
+from tfw.event_handler_base import EventHandlerBase
+from tfw.components.mixins import SupervisorMixin
+
+
+class ProcessManagingEventHandler(EventHandlerBase, SupervisorMixin):
+    def __init__(self, anchor, supervisor_process_name):
+        super().__init__(anchor)
+        self.process = supervisor_process_name
+        self.commands = {'start':   self.start_process,
+                         'stop':    self.stop_process,
+                         'restart': self.restart_process}
+
+    def handle_event(self, anchor, data_json):
+        data = data_json['data']
+        self.commands[data['command']]()