Python examples

git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@599876 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 220 insertions, 0 deletions

diff --git a/python/examples/pubsub/topic_consumer.py b/python/examples/pubsub/topic_consumer.py
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+#!/usr/bin/env python
+"""
+ topic_consumer.py
+
+ This AMQP client reads all messages from the
+ "news", "weather", "usa", and "europe" queues
+ created and bound by config_topic_exchange.py. 
+"""
+
+import base64
+
+import qpid
+from qpid.client import Client
+from qpid.content import Content
+from qpid.queue import Empty
+
+#----- Functions -------------------------------------------
+
+def dump_queue(client, queue_name):
+
+  print "Messages queue: " + queue_name 
+
+  consumer_tag = queue_name     # Use the queue name as the consumer tag - need a unique tag
+  queue = client.queue(consumer_tag)
+
+  # Call basic_consume() to tell the broker to deliver messages
+  # from the AMQP queue to a local client queue. The broker will
+  # start delivering messages as soon as basic_consume() is called.
+
+  session.message_subscribe(queue=queue_name, destination=consumer_tag)
+  session.message_flow(consumer_tag, 0, 0xFFFFFFFF)
+  session.message_flow(consumer_tag, 1, 0xFFFFFFFF)
+
+  content = ""		         # Content of the last message read
+  final = "That's all, folks!"   # In a message body, signals the last message
+  message = 0
+
+  while content != final:
+    try:
+      message = queue.get()
+      content = message.content.body
+      print content
+    except Empty:
+      if message != 0:
+        message.complete(cumulative=True)
+      print "No more messages!"
+      return
+
+
+  #  Messages are not removed from the queue until they
+  #  are acknowledged. Using multiple=True, all messages
+  #  in the channel up to and including the one identified
+  #  by the delivery tag are acknowledged. This is more efficient,
+  #  because there are fewer network round-trips.
+
+  if message != 0:
+    message.complete(cumulative=True)
+
+
+#----- Initialization --------------------------------------
+
+#  Set parameters for login
+
+host="127.0.0.1"
+port=5672
+amqp_spec="/usr/share/amqp/amqp.0-10-preview.xml"
+user="guest"
+password="guest"
+
+#  Create a client and log in to it.
+
+spec = qpid.spec.load(amqp_spec)
+client = Client(host, port, spec)
+client.start({"LOGIN": user, "PASSWORD": password})
+
+session = client.session()
+session = session.session_open()  # keep the session object, we'll need the session id
+
+#----- Main Body -- ----------------------------------------
+
+
+news = "news" + base64.urlsafe_b64encode(session.session_id)
+weather = "weather" + base64.urlsafe_b64encode(session.session_id)
+usa = "usa" + base64.urlsafe_b64encode(session.session_id)
+europe = "europe" + base64.urlsafe_b64encode(session.session_id)
+
+session.queue_declare(queue=news, exclusive=True)
+session.queue_declare(queue=weather, exclusive=True)
+session.queue_declare(queue=usa, exclusive=True)
+session.queue_declare(queue=europe, exclusive=True)
+
+# Routing keys may be "usa.news", "usa.weather", "europe.news", or "europe.weather".
+
+# The '#' symbol matches one component of a multipart name, e.g. "#.news" matches
+# "europe.news" or "usa.news".
+
+session.queue_bind(exchange="amq.topic", queue=news, routing_key="#.news")
+session.queue_bind(exchange="amq.topic", queue=weather, routing_key="#.weather")
+session.queue_bind(exchange="amq.topic", queue=usa, routing_key="usa.#")
+session.queue_bind(exchange="amq.topic", queue=europe, routing_key="europe.#")
+
+# Remind the user to start the topic producer
+
+print "Queues create - please start the topic producer"
+
+# Call dump_queue to print messages from each queue
+
+dump_queue(client, news)
+dump_queue(client, weather)
+dump_queue(client, usa)
+dump_queue(client, europe)
+
+#----- Cleanup ------------------------------------------------
+
+# Clean up before exiting so there are no open threads.
+#
+# Close Channel 1.
+
+session.session_close()
+
diff --git a/python/examples/pubsub/topic_producer.py b/python/examples/pubsub/topic_producer.py
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+#!/usr/bin/env python
+"""
+ topic_producer.py
+
+ This is a simple AMQP publisher application that uses a 
+ Topic exchange. The publisher specifies the routing key
+ and the exchange for each message.
+"""
+
+import qpid
+from qpid.client import Client
+from qpid.content import Content
+from qpid.queue import Empty
+
+#----- Initialization -----------------------------------
+
+#  Set parameters for login. 
+
+host="127.0.0.1"
+port=5672
+amqp_spec="/usr/share/amqp/amqp.0-10-preview.xml"
+user="guest"
+password="guest"
+
+#  Create a client and log in to it.
+
+spec = qpid.spec.load(amqp_spec)
+client = Client(host, port, spec)
+client.start({"LOGIN": user, "PASSWORD": password})
+
+session = client.session()
+session.session_open()
+
+#----- Publish some messages ------------------------------
+
+# Create some messages and put them on the broker. Use the
+# topic exchange.  The routing keys are "usa.news", "usa.weather", 
+# "europe.news", and "europe.weather".
+
+final = "That's all, folks!"
+
+# We'll use the same routing key for all messages in the loop, and
+# also for the terminating message.
+
+# usa.news
+
+for i in range(5):
+  message = Content("message " + str(i))
+  message["routing_key"] = "usa.news"
+  session.message_transfer(destination="amq.topic", content=message)
+
+message = Content(final)
+message["routing_key"] = "usa.news"
+session.message_transfer(destination="amq.topic", content=message)
+
+# usa.weather
+
+
+for i in range(5):
+  message = Content("message " + str(i))
+  message["routing_key"] = "usa.weather"
+  session.message_transfer(destination="amq.topic", content=message)
+
+message = Content(final)
+message["routing_key"] = "usa.weather"
+session.message_transfer(destination="amq.topic", content=message)
+
+# europe.news
+
+for i in range(5):
+  message = Content("message " + str(i))
+  message["routing_key"] = "europe.news"
+  session.message_transfer(destination="amq.topic", content=message)
+
+message = Content(final)
+message["routing_key"] = "europe.news"
+session.message_transfer(destination="amq.topic", content=message)
+
+
+# europe.weather
+
+for i in range(5):
+  message = Content("message " + str(i))
+  message["routing_key"] = "europe.weather"
+  session.message_transfer(destination="amq.topic", content=message)
+
+message = Content(final)
+message["routing_key"] = "europe.weather"
+session.message_transfer(destination="amq.topic", content=message)
+
+
+#----- Cleanup --------------------------------------------
+
+# Clean up before exiting so there are no open threads.
+#
+# Close Channel 1.
+
+
+session.session_close()
+