4.11.4. Subscribe to the XML Exchange

#!/usr/bin/python
import sys
from qpid.messaging import *

conn = Connection("localhost:5672")
conn.open()
try:
  ssn = conn.session()
  tx = ssn.sender("myxml/weather; {create: always, node: {type: topic, x-declare: {exchange: myxml, type: xml}}}")

  xquerystr = 'let $w := ./weather '
  xquerystr += "return $w/station = 'Raleigh-Durham International Airport (KRDU)' "
  xquerystr += 'and $w/temperature_f > 50 '
  xquerystr += 'and $w/temperature_f - $w/dewpoint > 5 '
  xquerystr += 'and $w/wind_speed_mph > 7 '
  xquerystr += 'and $w/wind_speed_mph < 20'

  rxaddr = 'myxmlq; {create: always, '
  rxaddr += 'link: {x-bindings: [{exchange: myxml, '
  rxaddr += 'key: weather, '
  rxaddr += 'arguments: {xquery: "' + xquerystr + '"'
  rxaddr += '}}]}}'
 
  rx = ssn.receiver(rxaddr)

  msgstr = '<weather>'
  msgstr += '<station>Raleigh-Durham International Airport (KRDU)</station>'
  msgstr += '<wind_speed_mph>16</wind_speed_mph>'
  msgstr += '<temperature_f>70</temperature_f>'
  msgstr += '<dewpoint>35</dewpoint>'
  msgstr += '</weather>'

  msg = Message(msgstr)
        
  tx.send(msg)

  rxmsg = rx.fetch(timeout=1)
  print rxmsg

  ssn.acknowledge()

finally:
  conn.close()

#!/usr/bin/python
import sys
from qpid.messaging import *

conn = Connection("localhost:5672")
conn.open()
try:
  ssn = conn.session()
  tx = ssn.sender("myxml/weather; {create: always, node: {type: topic, x-declare: {exchange: myxml, type: xml}}}")

  xquerystr = 'let $w := ./weather '
  xquerystr += "return $w/station = 'Raleigh-Durham International Airport (KRDU)' "
  xquerystr += 'and $w/temperature_f > 50 '
  xquerystr += 'and $w/temperature_f - $w/dewpoint > 5 '
  xquerystr += 'and $w/wind_speed_mph > 7 '
  xquerystr += 'and $w/wind_speed_mph < 20'

  rxaddr = 'myxmlq; {create: always, '
  rxaddr += 'link: {x-bindings: [{exchange: myxml, '
  rxaddr += 'key: weather, '
  rxaddr += 'arguments: {xquery: "' + xquerystr + '"'
  rxaddr += '}}]}}'
 
  rx = ssn.receiver(rxaddr)

  msgstr = '<weather>'
  msgstr += '<station>Raleigh-Durham International Airport (KRDU)</station>'
  msgstr += '<wind_speed_mph>16</wind_speed_mph>'
  msgstr += '<temperature_f>70</temperature_f>'
  msgstr += '<dewpoint>35</dewpoint>'
  msgstr += '</weather>'

  msg = Message(msgstr)
        
  tx.send(msg)

  rxmsg = rx.fetch(timeout=1)
  print rxmsg

  ssn.acknowledge()

finally:
  conn.close()