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#!/usr/bin/env python
"""
topic_publisher.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".
# 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)
# 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)
# 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)
# 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)
# Signal termination
message = Content("That's all, folks!")
message["routing_key"] = "control"
session.message_transfer(destination="amq.topic", content=message)
#----- Cleanup --------------------------------------------
# Clean up before exiting so there are no open threads.
session.session_close()
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