examples/engine/py/db_recv.py

#!/usr/bin/env python
#
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# 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,
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from proton.handlers import MessagingHandler
from proton.reactors import ApplicationEvent, Container
from db_common import Db

class Recv(MessagingHandler):
    def __init__(self, url):
        super(Recv, self).__init__(auto_accept=False)
        self.url = url
        self.delay = 0
        # TODO: load last tag from db
        self.last_id = None

    def on_start(self, event):
        self.db = Db("dst_db", event.container.get_event_trigger())
        event.container.create_receiver(self.url)

    def on_record_inserted(self, event):
        self.accept(event.delivery)

    def on_message(self, event):
        id = int(event.message.id)
        if (not self.last_id) or id > self.last_id:
            self.last_id = id
            self.db.insert(id, event.message.body, ApplicationEvent("record_inserted", delivery=event.delivery))
            print "inserted message %s" % id
        else:
            self.accept(event.delivery)

try:
    Container(Recv("localhost:5672/examples")).run()
except KeyboardInterrupt: pass