actor with non stoping execution

analytics/utils/concurrent.py

@@ -1,6 +1,8 @@
 import asyncio
 import threading
 import zmq
+import sys
+
 import zmq.asyncio
 from abc import ABC, abstractmethod
 
@@ -18,11 +20,21 @@ class AsyncZmqThread(threading.Thread, ABC):
     """
 
     def __init__(self,
+        run_until_complete: bool,
         zmq_context: zmq.asyncio.Context,
         zmq_socket_addr: str,
         zmq_socket_type = zmq.PAIR
     ):
+        """
+        Parameters
+        ----------
+        run_until_complete : bool
+            stop the thread when _run_thread completes. Set it to False
+            to be abel to run _on_message_to_thread() and make work there after
+             _run_thread completed
+        """
         super(AsyncZmqThread, self).__init__()
+        self.run_until_complete = run_until_complete
         self._zmq_context = zmq_context # you can use it in child classes
         self.__zmq_socket_addr = zmq_socket_addr
         self.__zmq_socket_type = zmq_socket_type
@@ -40,6 +52,7 @@ class AsyncZmqThread(threading.Thread, ABC):
     @abstractmethod
     async def _on_message_to_thread(self, message: str):
         """Override this method to receive messages"""
+        pass
 
     @abstractmethod
     async def _run_thread(self):
@@ -59,6 +72,7 @@ class AsyncZmqThread(threading.Thread, ABC):
                 await self._send_message_from_thread(f'{self.name}: ping {i}')
         ```
         """
+        pass
 
     def run(self):
         self.__asyncio_loop = asyncio.new_event_loop()
@@ -66,7 +80,11 @@ class AsyncZmqThread(threading.Thread, ABC):
         self.__zmq_socket = self._zmq_context.socket(self.__zmq_socket_type)
         self.__zmq_socket.connect(self.__zmq_socket_addr)
         asyncio.ensure_future(self.__message_recv_loop())
+        if self.run_until_complete:
             self.__asyncio_loop.run_until_complete(self._run_thread())
+        else:
+            asyncio.ensure_future(self._run_thread())
+            self.__asyncio_loop.run_forever()
 
     # TODO: implement stop signal handling
 
@@ -86,26 +104,46 @@ class AsyncZmqActor(AsyncZmqThread):
 
     to receive it later in `self._recv_message_from_thread()`.
 
-    Example:
+    Example 1:
 
     ```
     class MyActor(AsyncZmqActor):
         async def _run_thread(self):
             self.counter = 0
-            # runs in a different thread
+            # runs in a different MyActor-thread
             await self._send_message_from_thread('some_txt_message_to_actor')
 
-        def async _on_message_to_thread(self, message):
+        async def _on_message_to_thread(self, message):
-            # runs in Thread-actor
+            # some work in handler in MyActor-thread
             self.counter++
 
     asyncZmqActor = MyActor()
     asyncZmqActor.start()
     ```
-    """
 
+    Example 2
+    ```
+    import time
+    class MyActor(AsyncZmqActor):
         def __init__(self):
-        super(AsyncZmqActor, self).__init__(zmq.asyncio.Context(), ZMQ_THREAD_ACTOR_ADDR)
+            super(MyActor, self).__init__(False)
+
+        async def _run_thread(self):
+            pass # no work here
+
+        async def _on_message_to_thread(self, message):
+            time.sleep(1)
+            print('work on message finished')
+
+    asyncZmqActor = MyActor()
+    asyncZmqActor.start()
+    ```
+    """
+
+    def __init__(self, run_until_complete: bool = True):
+        super(AsyncZmqActor, self).__init__(
+            run_until_complete, zmq.asyncio.Context(), ZMQ_THREAD_ACTOR_ADDR
+        )
 
         self.__actor_socket = self._zmq_context.socket(zmq.PAIR)
         self.__actor_socket.bind(ZMQ_THREAD_ACTOR_ADDR)