Add 'car/' from commit 'eee0e8dc445691e600680f4abc77f2814b20b054'

git-subtree-dir: car
git-subtree-mainline: 1d29a5526c
git-subtree-split: eee0e8dc44

car/Messaging/message_factory.py

@@ -0,0 +1,64 @@
+import zmq
+
+
+class ZmqPubSubStreamer:
+    '''
+    Not thread-safe. Always get this inside the thread/process where you intend
+    to use it. 
+    '''
+
+    def __init__(self, port):
+        self._socket = zmq.Context.instance().socket(zmq.PUB)
+        print('Starting socket with address: ' + 'tcp://*:' + str(port))
+        self._socket.bind("tcp://*:" + str(port))
+        
+
+    def send_message(self, message):
+        '''
+        Args
+        ----
+        message: A message type that has the serialise() method.
+        '''
+        self.send_message_topic("", message)
+
+    def send_message_topic(self, topic, message):
+        self._socket.send_multipart([bytes(topic), message.serialise()])
+
+
+class BluetoothStreamer:
+    def __init__(self):
+        pass
+
+    def send_message(self, message_bytes):
+        pass
+
+class TestStreamer:
+    def __init__(self):
+        self._listeners = []
+
+    def send_message(self, message_bytes):
+        print('Got a message')
+
+    def send_message_topic(self, topic, message):
+        print('Got a message with topic: ' + str(topic))
+        self._fire_message_received(message)
+
+    def add_message_listener(self, listener):
+        self._listeners.append(listener)
+
+    def _fire_message_received(self, message):
+        for listener in self._listeners:
+            listener(message)
+
+def getZmqPubSubStreamer(port):
+    '''
+    Not thread-safe. Always get this inside the thread/process where you intend
+    to use it. 
+    '''
+    return ZmqPubSubStreamer(port)
+
+def getTestingStreamer():
+    return TestStreamer()
+
+# TODO: Create a general get method that will get the streamer based on an 
+# environment variable that is set.