Creating a branch for experimenting with some ideas for JMS client.rajith_jms_client

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/rajith_jms_client@1128369 13f79535-47bb-0310-9956-ffa450edef68

10 files changed, 960 insertions, 0 deletions

diff --git a/qpid/python/examples/README.txt b/qpid/python/examples/README.txt
new file mode 100644
index 0000000000..4395160fec
--- /dev/null
+++ b/qpid/python/examples/README.txt
@@ -0,0 +1,42 @@
+The Python Examples
+===================
+
+README.txt                 -- This file.
+
+api                        -- Directory containing drain, spout,
+                              sever, hello, and hello_xml examples.
+
+api/drain                  -- A simple messaging client that prints
+                              messages from the source specified on
+                              the command line.
+
+api/spout                  -- A simple messaging client that sends
+                              messages to the target specified on the
+                              command line.
+
+api/server                 -- An example server that process incoming
+                              messages and sends replies.
+
+api/hello                  -- An example client that sends a message
+                              and then receives it.
+
+api/hello_xml              -- An example client that sends a message
+                              to the xml exchange and then receives
+                              it.
+
+
+reservations               -- Directory containing an example machine
+                              reservation system.
+
+reservations/common.py     -- Utility code used by reserve,
+                              machine-agent, and inventory scripts.
+
+reservations/reserve       -- Messaging client for listing, reserving,
+                              and releasing machines.
+
+reservations/machine-agent -- Messaging server that tracks and reports
+                              on the status of its host machine and
+                              listens for reservation requests.
+
+reservations/inventory     -- Messaging server that tracks the last
+                              known status of machines.
diff --git a/qpid/python/examples/api/drain b/qpid/python/examples/api/drain
new file mode 100755
index 0000000000..5e30153bc2
--- /dev/null
+++ b/qpid/python/examples/api/drain
@@ -0,0 +1,97 @@
+#!/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 optparse
+from qpid.messaging import *
+from qpid.util import URL
+from qpid.log import enable, DEBUG, WARN
+
+parser = optparse.OptionParser(usage="usage: %prog [options] ADDRESS ...",
+                               description="Drain messages from the supplied address.")
+parser.add_option("-b", "--broker", default="localhost",
+                  help="connect to specified BROKER (default %default)")
+parser.add_option("-c", "--count", type="int",
+                  help="number of messages to drain")
+parser.add_option("-f", "--forever", action="store_true",
+                  help="ignore timeout and wait forever")
+parser.add_option("-r", "--reconnect", action="store_true",
+                  help="enable auto reconnect")
+parser.add_option("-i", "--reconnect-interval", type="float", default=3,
+                  help="interval between reconnect attempts")
+parser.add_option("-l", "--reconnect-limit", type="int",
+                  help="maximum number of reconnect attempts")
+parser.add_option("-t", "--timeout", type="float", default=0,
+                  help="timeout in seconds to wait before exiting (default %default)")
+parser.add_option("-p", "--print", dest="format", default="%(M)s",
+                  help="format string for printing messages (default %default)")
+parser.add_option("-v", dest="verbose", action="store_true",
+                  help="enable logging")
+
+opts, args = parser.parse_args()
+
+if opts.verbose:
+  enable("qpid", DEBUG)
+else:
+  enable("qpid", WARN)
+
+if args:
+  addr = args.pop(0)
+else:
+  parser.error("address is required")
+if opts.forever:
+  timeout = None
+else:
+  timeout = opts.timeout
+
+class Formatter:
+
+  def __init__(self, message):
+    self.message = message
+    self.environ = {"M": self.message,
+                    "P": self.message.properties,
+                    "C": self.message.content}
+
+  def __getitem__(self, st):
+    return eval(st, self.environ)
+
+conn = Connection(opts.broker,
+                  reconnect=opts.reconnect,
+                  reconnect_interval=opts.reconnect_interval,
+                  reconnect_limit=opts.reconnect_limit)
+try:
+  conn.open()
+  ssn = conn.session()
+  rcv = ssn.receiver(addr)
+
+  count = 0
+  while not opts.count or count < opts.count:
+    try:
+      msg = rcv.fetch(timeout=timeout)
+      print opts.format % Formatter(msg)
+      count += 1
+      ssn.acknowledge()
+    except Empty:
+      break
+except ReceiverError, e:
+  print e
+except KeyboardInterrupt:
+  pass
+
+conn.close()
diff --git a/qpid/python/examples/api/hello b/qpid/python/examples/api/hello
new file mode 100755
index 0000000000..ad314da19e
--- /dev/null
+++ b/qpid/python/examples/api/hello
@@ -0,0 +1,52 @@
+#!/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 *
+
+if len(sys.argv)<2:
+  broker =  "localhost:5672" 
+else:
+  broker = sys.argv[1]
+
+if len(sys.argv)<3: 
+  address = "amq.topic" 
+else:
+  address = sys.argv[2]
+
+connection = Connection(broker)
+
+try:
+  connection.open()
+  session = connection.session()
+
+  sender = session.sender(address)
+  receiver = session.receiver(address)
+
+  sender.send(Message("Hello world!"));
+
+  message = receiver.fetch()
+  print message.content
+  session.acknowledge()
+
+except MessagingError,m:
+  print m
+
+connection.close()
diff --git a/qpid/python/examples/api/hello_xml b/qpid/python/examples/api/hello_xml
new file mode 100755
index 0000000000..ab567ec5dd
--- /dev/null
+++ b/qpid/python/examples/api/hello_xml
@@ -0,0 +1,77 @@
+#!/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()
diff --git a/qpid/python/examples/api/server b/qpid/python/examples/api/server
new file mode 100755
index 0000000000..3b9a3560da
--- /dev/null
+++ b/qpid/python/examples/api/server
@@ -0,0 +1,95 @@
+#!/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 optparse, sys, traceback
+from qpid.messaging import *
+from qpid.util import URL
+from subprocess import Popen, STDOUT, PIPE
+from qpid.log import enable, DEBUG, WARN
+
+parser = optparse.OptionParser(usage="usage: %prog [options] ADDRESS ...",
+                               description="handle requests from the supplied address.")
+parser.add_option("-b", "--broker", default="localhost",
+                  help="connect to specified BROKER (default %default)")
+parser.add_option("-r", "--reconnect", action="store_true",
+                  help="enable auto reconnect")
+parser.add_option("-i", "--reconnect-interval", type="float", default=3,
+                  help="interval between reconnect attempts")
+parser.add_option("-l", "--reconnect-limit", type="int",
+                  help="maximum number of reconnect attempts")
+parser.add_option("-v", dest="verbose", action="store_true",
+                  help="enable logging")
+
+opts, args = parser.parse_args()
+
+if opts.verbose:
+  enable("qpid", DEBUG)
+else:
+  enable("qpid", WARN)
+
+if args:
+  addr = args.pop(0)
+else:
+  parser.error("address is required")
+
+conn = Connection(opts.broker,
+                  reconnect=opts.reconnect,
+                  reconnect_interval=opts.reconnect_interval,
+                  reconnect_limit=opts.reconnect_limit)
+def dispatch(msg):
+  msg_type = msg.properties.get("type")
+  if msg_type == "shell":
+    proc = Popen(msg.content, shell=True, stderr=STDOUT, stdin=PIPE, stdout=PIPE)
+    output, _ = proc.communicate()
+    result = Message(output)
+    result.properties["exit"] = proc.returncode
+  elif msg_type == "eval":
+    try:
+      content = eval(msg.content)
+    except:
+      content = traceback.format_exc()
+    result = Message(content)
+  else:
+    result = Message("unrecognized message type: %s" % msg_type)
+  return result
+
+try:
+  conn.open()
+  ssn = conn.session()
+  rcv = ssn.receiver(addr)
+
+  while True:
+    msg = rcv.fetch()
+    response = dispatch(msg)
+    snd = None
+    try:
+      snd = ssn.sender(msg.reply_to)
+      snd.send(response)
+    except SendError, e:
+      print e
+    if snd is not None:
+      snd.close()
+    ssn.acknowledge()
+except ReceiveError, e:
+  print e
+except KeyboardInterrupt:
+  pass
+
+conn.close()
diff --git a/qpid/python/examples/api/spout b/qpid/python/examples/api/spout
new file mode 100755
index 0000000000..c2dc4db380
--- /dev/null
+++ b/qpid/python/examples/api/spout
@@ -0,0 +1,123 @@
+#!/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 optparse, time
+from qpid.messaging import *
+from qpid.util import URL
+from qpid.log import enable, DEBUG, WARN
+
+def nameval(st):
+  idx = st.find("=")
+  if idx >= 0:
+    name = st[0:idx]
+    value = st[idx+1:]
+  else:
+    name = st
+    value = None
+  return name, value
+
+parser = optparse.OptionParser(usage="usage: %prog [options] ADDRESS [ CONTENT ... ]",
+                               description="Send messages to the supplied address.")
+parser.add_option("-b", "--broker", default="localhost",
+                  help="connect to specified BROKER (default %default)")
+parser.add_option("-r", "--reconnect", action="store_true",
+                  help="enable auto reconnect")
+parser.add_option("-i", "--reconnect-interval", type="float", default=3,
+                  help="interval between reconnect attempts")
+parser.add_option("-l", "--reconnect-limit", type="int",
+                  help="maximum number of reconnect attempts")
+parser.add_option("-c", "--count", type="int", default=1,
+                  help="stop after count messages have been sent, zero disables (default %default)")
+parser.add_option("-t", "--timeout", type="float", default=None,
+                  help="exit after the specified time")
+parser.add_option("-I", "--id", help="use the supplied id instead of generating one")
+parser.add_option("-S", "--subject", help="specify a subject")
+parser.add_option("-R", "--reply-to", help="specify reply-to address")
+parser.add_option("-P", "--property", dest="properties", action="append", default=[],
+                  metavar="NAME=VALUE", help="specify message property")
+parser.add_option("-M", "--map", dest="entries", action="append", default=[],
+                  metavar="KEY=VALUE",
+                  help="specify map entry for message body")
+parser.add_option("-v", dest="verbose", action="store_true",
+                  help="enable logging")
+
+opts, args = parser.parse_args()
+
+if opts.verbose:
+  enable("qpid", DEBUG)
+else:
+  enable("qpid", WARN)
+
+if opts.id is None:
+  spout_id = str(uuid4())
+else:
+  spout_id = opts.id
+if args:
+  addr = args.pop(0)
+else:
+  parser.error("address is required")
+
+content = None
+
+if args:
+  text = " ".join(args)
+else:
+  text = None
+
+if opts.entries:
+  content = {}
+  if text:
+    content["text"] = text
+  for e in opts.entries:
+    name, val = nameval(e)
+    content[name] = val
+else:
+  content = text
+
+conn = Connection(opts.broker,
+                  reconnect=opts.reconnect,
+                  reconnect_interval=opts.reconnect_interval,
+                  reconnect_limit=opts.reconnect_limit)
+try:
+  conn.open()
+  ssn = conn.session()
+  snd = ssn.sender(addr)
+
+  count = 0
+  start = time.time()
+  while (opts.count == 0 or count < opts.count) and \
+        (opts.timeout is None or time.time() - start < opts.timeout):
+    msg = Message(subject=opts.subject,
+                  reply_to=opts.reply_to,
+                  content=content)
+    msg.properties["spout-id"] = "%s:%s" % (spout_id, count)
+    for p in opts.properties:
+      name, val = nameval(p)
+      msg.properties[name] = val
+
+    snd.send(msg)
+    count += 1
+    print msg
+except SendError, e:
+  print e
+except KeyboardInterrupt:
+  pass
+
+conn.close()
diff --git a/qpid/python/examples/reservations/common.py b/qpid/python/examples/reservations/common.py
new file mode 100644
index 0000000000..12f07e1c92
--- /dev/null
+++ b/qpid/python/examples/reservations/common.py
@@ -0,0 +1,80 @@
+#!/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 traceback
+from fnmatch import fnmatch
+from qpid.messaging import *
+
+class Dispatcher:
+
+  def unhandled(self, msg):
+    print "UNHANDLED MESSAGE: %s" % msg
+
+  def ignored(self, msg):
+    return False
+
+  def dispatch(self, msg):
+    try:
+      if self.ignored(msg):
+        return ()
+      else:
+        type = msg.properties.get("type")
+        replies = getattr(self, "do_%s" % type, self.unhandled)(msg)
+        if replies is None:
+          return ()
+        else:
+          return replies
+    except:
+      traceback.print_exc()
+      return ()
+
+  def run(self, session):
+    while self.running():
+      msg = session.next_receiver().fetch()
+      replies = self.dispatch(msg)
+
+      count = len(replies)
+      sequence = 1
+      for to, r in replies:
+        r.correlation_id = msg.correlation_id
+        r.properties["count"] = count
+        r.properties["sequence"] = sequence
+        sequence += 1
+        try:
+          snd = session.sender(to)
+          snd.send(r)
+        except SendError, e:
+          print e
+        finally:
+          snd.close()
+
+      session.acknowledge(msg)
+
+def get_status(msg):
+  return msg.content["identity"], msg.content["status"], msg.content["owner"]
+
+FREE = "free"
+BUSY = "busy"
+
+def match(value, patterns):
+  for p in patterns:
+    if fnmatch(value, p):
+      return True
+  return False
diff --git a/qpid/python/examples/reservations/inventory b/qpid/python/examples/reservations/inventory
new file mode 100755
index 0000000000..0a49643e5f
--- /dev/null
+++ b/qpid/python/examples/reservations/inventory
@@ -0,0 +1,94 @@
+#!/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 optparse, traceback
+from qpid.messaging import *
+from qpid.log import enable, DEBUG, WARN
+from common import *
+
+parser = optparse.OptionParser(usage="usage: %prog [options]",
+                               description="machine inventory agent")
+parser.add_option("-b", "--broker", default="localhost",
+                  help="connect to specified BROKER (default %default)")
+parser.add_option("-d", "--database",
+                  help="database file for persistent machine status")
+parser.add_option("-a", "--address", default="reservations",
+                  help="address for reservation requests")
+parser.add_option("-v", dest="verbose", action="store_true",
+                  help="enable verbose logging")
+
+opts, args = parser.parse_args()
+
+if opts.verbose:
+  enable("qpid", DEBUG)
+else:
+  enable("qpid", WARN)
+
+conn = Connection.establish(opts.broker, reconnect=True, reconnect_interval=1)
+
+class Inventory(Dispatcher):
+
+  def __init__(self):
+    self.agents = {}
+
+  def running(self):
+    return True
+
+  def do_status(self, msg):
+    id, status, owner = get_status(msg)
+    self.agents[id] = (status, owner)
+
+  def do_query(self, msg):
+    patterns = msg.content["identity"]
+    result = []
+    for id, (status, owner) in self.agents.items():
+      if match(id, patterns):
+        r = Message(properties = {
+            "type": "status"
+            },
+                    content = {
+            "identity": id,
+            "status": status,
+            "owner": owner
+            })
+        result.append((msg.reply_to, r))
+        continue
+    if not result:
+      result.append((msg.reply_to,
+                     Message(properties = {"type": "empty"})))
+    return result
+
+  def ignored(self, msg):
+    type = msg.properties.get("type")
+    return type not in ("status", "query")
+
+try:
+  ssn = conn.session()
+  rcv = ssn.receiver(opts.address, capacity = 10)
+  snd = ssn.sender(opts.address)
+  snd.send(Message(reply_to = opts.address,
+                   properties = {"type": "discover", "identity": ["*"]}))
+
+  inv = Inventory()
+  inv.run(ssn)
+except KeyboardInterrupt:
+  pass
+finally:
+  conn.close()
diff --git a/qpid/python/examples/reservations/machine-agent b/qpid/python/examples/reservations/machine-agent
new file mode 100755
index 0000000000..a221a8b6de
--- /dev/null
+++ b/qpid/python/examples/reservations/machine-agent
@@ -0,0 +1,103 @@
+#!/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 optparse, socket
+from qpid.messaging import *
+from qpid.log import enable, DEBUG, WARN
+from common import *
+
+host = socket.gethostname()
+
+parser = optparse.OptionParser(usage="usage: %prog [options]",
+                               description="machine reservation agent")
+parser.add_option("-b", "--broker", default="localhost",
+                  help="connect to specified BROKER (default %default)")
+parser.add_option("-d", "--database",
+                  help="database file for persistent machine status")
+parser.add_option("-a", "--address", default="reservations",
+                  help="address for reservation requests")
+parser.add_option("-i", "--identity", default=host,
+                  help="resource id (default %default)")
+parser.add_option("-v", dest="verbose", action="store_true",
+                  help="enable verbose logging")
+
+opts, args = parser.parse_args()
+
+if opts.verbose:
+  enable("qpid", DEBUG)
+else:
+  enable("qpid", WARN)
+
+conn = Connection.establish(opts.broker, reconnect=True, reconnect_interval=1)
+
+
+class Agent(Dispatcher):
+
+  def __init__(self, identity):
+    self.identity = identity
+    self.status = FREE
+    self.owner = None
+
+  def running(self):
+    return True
+
+  def get_status(self):
+    msg = Message(properties = {"type": "status"},
+                  content = {"identity": self.identity,
+                             "status": self.status,
+                             "owner": self.owner})
+    return msg
+
+  def do_discover(self, msg):
+    r = self.get_status()
+    return [(msg.reply_to, r)]
+
+  def do_reserve(self, msg):
+    if self.status == FREE:
+      self.owner = msg.content["owner"]
+      self.status = BUSY
+    return self.do_discover(msg)
+
+  def do_release(self, msg):
+    if self.owner == msg.content["owner"]:
+      self.status = FREE
+      self.owner = None
+    return self.do_discover(msg)
+
+  def ignored(self, msg):
+    patterns = msg.properties.get("identity")
+    type = msg.properties.get("type")
+    if patterns and match(self.identity, patterns):
+      return type == "status"
+    else:
+      return True
+
+try:
+  ssn = conn.session()
+  rcv = ssn.receiver(opts.address)
+  rcv.capacity = 10
+  snd = ssn.sender(opts.address)
+  agent = Agent(opts.identity)
+  snd.send(agent.get_status())
+  agent.run(ssn)
+except KeyboardInterrupt:
+  pass
+finally:
+  conn.close()
diff --git a/qpid/python/examples/reservations/reserve b/qpid/python/examples/reservations/reserve
new file mode 100755
index 0000000000..68e7fee912
--- /dev/null
+++ b/qpid/python/examples/reservations/reserve
@@ -0,0 +1,197 @@
+#!/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 optparse, os, sys, time
+from uuid import uuid4
+from qpid.messaging import *
+from qpid.log import enable, DEBUG, WARN
+from common import *
+
+parser = optparse.OptionParser(usage="usage: %prog [options] PATTERN ...",
+                               description="reserve a machine")
+parser.add_option("-b", "--broker", default="localhost",
+                  help="connect to specified BROKER (default %default)")
+parser.add_option("-a", "--address", default="reservations",
+                  help="address for reservation requests")
+parser.add_option("-r", "--release", action="store_true",
+                  help="release any machines matching the pattern")
+parser.add_option("-s", "--status", action="store_true",
+                  help="list machine status")
+parser.add_option("-d", "--discover", action="store_true",
+                  help="use discovery instead of inventory")
+parser.add_option("-o", "--owner", default=os.environ["USER"],
+                  help="the holder of the reservation")
+parser.add_option("-n", "--number", type=int, default=1,
+                  help="the number of machines to reserve")
+parser.add_option("-t", "--timeout", type=float, default=10,
+                  help="timeout in seconds to wait for resources")
+parser.add_option("-v", dest="verbose", action="store_true",
+                  help="enable verbose logging")
+
+opts, args = parser.parse_args()
+
+if opts.verbose:
+  enable("qpid", DEBUG)
+else:
+  enable("qpid", WARN)
+
+if args:
+  patterns = args
+else:
+  patterns = ["*"]
+
+conn = Connection.establish(opts.broker)
+
+if opts.release:
+  request_type = "release"
+  candidate_status = BUSY
+  candidate_owner = opts.owner
+else:
+  request_type = "reserve"
+  candidate_status = FREE
+  candidate_owner = None
+
+class Requester(Dispatcher):
+
+  def __init__(self):
+    self.agents = {}
+    self.requests = set()
+    self.outstanding = set()
+
+  def agent_status(self, id):
+    status, owner = self.agents[id]
+    if owner:
+      return "%s %s(%s)" % (id, status, owner)
+    else:
+      return "%s %s" % (id, status)
+
+  def correlation(self, cid):
+    self.requests.add(cid)
+    self.outstanding.add(cid)
+
+  def ignored(self, msg):
+    return msg.properties.get("type") not in ("status", "empty") or \
+        msg.correlation_id not in self.requests
+
+  def do_status(self, msg):
+    id, status, owner = get_status(msg)
+    self.agents[id] = (status, owner)
+
+    if opts.status:
+      print self.agent_status(id)
+
+  def do_empty(self, msg):
+    print "no matching resources"
+
+  def candidates(self, candidate_status, candidate_owner):
+    for id, (status, owner) in self.agents.items():
+      if status == candidate_status and owner == candidate_owner:
+        yield id
+
+  def dispatch(self, msg):
+    result = Dispatcher.dispatch(self, msg)
+    count = msg.properties.get("count")
+    sequence = msg.properties.get("sequence")
+    if count and sequence == count:
+      self.outstanding.discard(msg.correlation_id)
+    return result
+
+try:
+  ssn = conn.session()
+  rcv = ssn.receiver(opts.address, capacity=10)
+  snd = ssn.sender(opts.address)
+
+  correlation_id = str(uuid4())
+
+  if opts.discover:
+    properties = {"type": "discover", "identity": patterns}
+    content = None
+  else:
+    properties = {"type": "query"}
+    content = {"identity": patterns}
+
+  snd.send(Message(reply_to = opts.address,
+                   correlation_id = correlation_id,
+                   properties = properties,
+                   content = content))
+
+  req = Requester()
+  req.correlation(correlation_id)
+
+  start = time.time()
+  ellapsed = 0
+  requested = set()
+  discovering = opts.discover
+
+  while ellapsed <= opts.timeout and (discovering or req.outstanding):
+    try:
+      msg = rcv.fetch(opts.timeout - ellapsed)
+      ssn.acknowledge(msg)
+    except Empty:
+      continue
+    finally:
+      ellapsed = time.time() - start
+
+    req.dispatch(msg)
+    if not opts.status:
+      if len(requested) < opts.number:
+        for cid in req.candidates(candidate_status, candidate_owner):
+          if cid in requested: continue
+          req_msg = Message(reply_to = opts.address,
+                            correlation_id = str(uuid4()),
+                            properties = {"type": request_type,
+                                          "identity": [cid]},
+                            content = {"owner": opts.owner})
+          if not requested:
+            print "requesting %s:" % request_type,
+          print cid,
+          sys.stdout.flush()
+          req.correlation(req_msg.correlation_id)
+          snd.send(req_msg)
+          requested.add(cid)
+      else:
+        discovering = False
+
+  if requested:
+    print
+    owners = {}
+    for id in requested:
+      st, ow = req.agents[id]
+      if not owners.has_key(ow):
+        owners[ow] = []
+      owners[ow].append(id)
+    keys = list(owners.keys())
+    keys.sort()
+    for k in keys:
+      owners[k].sort()
+      v = ", ".join(owners[k])
+      if k is None:
+        print "free: %s" % v
+      else:
+        print "owner %s: %s" % (k, v)
+  elif req.agents and not opts.status:
+    print "no available resources"
+
+  if req.outstanding:
+    print "request timed out"
+except KeyboardInterrupt:
+  pass
+finally:
+  conn.close()