Added controlled thread shutdown to example.py (dpkp#1268)

Author: TheAtomicOption

example.py

@@ -6,29 +6,46 @@
 
 
 class Producer(threading.Thread):
-    daemon = True
+    def __init__(self):
+        threading.Thread.__init__(self)
+        self.stop_event = threading.Event()
+        
+    def stop(self):
+        self.stop_event.set()
 
     def run(self):
         producer = KafkaProducer(bootstrap_servers='localhost:9092')
 
-        while True:
+        while not self.stop_event.is_set():
             producer.send('my-topic', b"test")
             producer.send('my-topic', b"\xc2Hola, mundo!")
             time.sleep(1)
 
+        producer.close()
 
 class Consumer(multiprocessing.Process):
-    daemon = True
-
+    def __init__(self):
+        multiprocessing.Process.__init__(self)
+        self.stop_event = multiprocessing.Event()
+        
+    def stop(self):
+        self.stop_event.set()
+        
     def run(self):
         consumer = KafkaConsumer(bootstrap_servers='localhost:9092',
-                                 auto_offset_reset='earliest')
+                                 auto_offset_reset='earliest',
+                                 consumer_timeout_ms=1000)
         consumer.subscribe(['my-topic'])
 
-        for message in consumer:
-            print (message)
-
+        while not self.stop_event.is_set():
+            for message in consumer:
+                print(message)
+                if self.stop_event.is_set():
+                    break
 
+        consumer.close()
+        
+        
 def main():
     tasks = [
         Producer(),
@@ -39,7 +56,14 @@ def main():
         t.start()
 
     time.sleep(10)
+    
+    for task in tasks:
+        task.stop()
 
+    for task in tasks:
+        task.join()
+        
+        
 if __name__ == "__main__":
     logging.basicConfig(
         format='%(asctime)s.%(msecs)s:%(name)s:%(thread)d:%(levelname)s:%(process)d:%(message)s',