Update example.py (#2081)

Co-authored-by: MostafaElmenabawy <momenabawy@synapse-analytics.io>

Author: mmenbawy

example.py

@@ -1,15 +1,15 @@
 #!/usr/bin/env python
-import threading, logging, time
-import multiprocessing
+import threading, time
 
-from kafka import KafkaConsumer, KafkaProducer
+from kafka import KafkaAdminClient, KafkaConsumer, KafkaProducer
+from kafka.admin import NewTopic
 
 
 class Producer(threading.Thread):
     def __init__(self):
         threading.Thread.__init__(self)
         self.stop_event = threading.Event()
-        
+
     def stop(self):
         self.stop_event.set()
 
@@ -23,14 +23,15 @@ def run(self):
 
         producer.close()
 
-class Consumer(multiprocessing.Process):
+
+class Consumer(threading.Thread):
     def __init__(self):
-        multiprocessing.Process.__init__(self)
-        self.stop_event = multiprocessing.Event()
-        
+        threading.Thread.__init__(self)
+        self.stop_event = threading.Event()
+
     def stop(self):
         self.stop_event.set()
-        
+
     def run(self):
         consumer = KafkaConsumer(bootstrap_servers='localhost:9092',
                                  auto_offset_reset='earliest',
@@ -44,29 +45,38 @@ def run(self):
                     break
 
         consumer.close()
-        
-        
+
+
 def main():
+    # Create 'my-topic' Kafka topic
+    try:
+        admin = KafkaAdminClient(bootstrap_servers='localhost:9092')
+
+        topic = NewTopic(name='my-topic',
+                         num_partitions=1,
+                         replication_factor=1)
+        admin.create_topics([topic])
+    except Exception:
+        pass
+
     tasks = [
         Producer(),
         Consumer()
     ]
 
+    # Start threads of a publisher/producer and a subscriber/consumer to 'my-topic' Kafka topic
     for t in tasks:
         t.start()
 
     time.sleep(10)
-    
+
+    # Stop threads
     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',
-        level=logging.INFO
-        )
     main()