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#!/usr/bin/env python
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
import sys
from qpid.messaging import *
broker = "localhost:5672"
connection = Connection(broker)
try:
connection.open()
session = connection.session()
# Set up the receiver
query = """
let $w := ./weather
return $w/station = 'Raleigh-Durham International Airport (KRDU)'
and $w/temperature_f > 50
and $w/temperature_f - $w/dewpoint > 5
and $w/wind_speed_mph > 7
and $w/wind_speed_mph < 20 """
# query="./weather"
address = """
xml; {
create: always,
node:{ type: queue },
link: {
x-bindings: [{ exchange: xml, key: weather, arguments: { xquery: %r} }]
}
}
""" % query
receiver = session.receiver(address)
# Send an observation
observations = """
<weather>
<station>Raleigh-Durham International Airport (KRDU)</station>
<wind_speed_mph>16</wind_speed_mph>
<temperature_f>70</temperature_f>
<dewpoint>35</dewpoint>
</weather> """
message = Message(subject="weather", content=observations)
sender = session.sender("xml")
sender.send(message)
# Retrieve matching message from the receiver and print it
message = receiver.fetch(timeout=1)
print message.content
session.acknowledge()
except MessagingError,m:
print m
connection.close()
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