| #!/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() |