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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 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()
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