import optparse
from proton import Url
from proton.reactor import Container
from proton.handlers import MessagingHandler, TransactionHandler
class TxRecv(MessagingHandler, TransactionHandler):
def __init__(self, url, messages, batch_size):
super(TxRecv, self).__init__(prefetch=0, auto_accept=False)
self.url = Url(url)
self.expected = messages
self.batch_size = batch_size
self.current_batch = 0
self.committed = 0
def on_start(self, event):
self.container = event.container
self.conn = self.container.connect(self.url)
self.receiver = self.container.create_receiver(self.conn, self.url.path)
self.container.declare_transaction(self.conn, handler=self)
self.transaction = None
def on_message(self, event):
print(event.message.body)
self.transaction.accept(event.delivery)
self.current_batch += 1
if self.current_batch == self.batch_size:
self.transaction.commit()
self.transaction = None
def on_transaction_declared(self, event):
self.receiver.flow(self.batch_size)
self.transaction = event.transaction
def on_transaction_committed(self, event):
self.committed += self.current_batch
self.current_batch = 0
if self.expected == 0 or self.committed < self.expected:
self.container.declare_transaction(self.conn, handler=self)
else:
event.connection.close()
def on_disconnected(self, event):
self.current_batch = 0
parser = optparse.OptionParser(usage="usage: %prog [options]")
parser.add_option("-a", "--address", default="localhost:5672/examples",
help="address from which messages are received (default %default)")
parser.add_option("-m", "--messages", type="int", default=100,
help="number of messages to receive; 0 receives indefinitely (default %default)")
parser.add_option("-b", "--batch-size", type="int", default=10,
help="number of messages in each transaction (default %default)")
opts, args = parser.parse_args()
try:
Container(TxRecv(opts.address, opts.messages, opts.batch_size)).run()
except KeyboardInterrupt:
pass
Apache Qpid, Messaging built on AMQP; Copyright © 2015 The Apache Software Foundation; Licensed under the Apache License, Version 2.0; Apache Qpid, Qpid, Qpid Proton, Proton, Apache, the Apache feather logo, and the Apache Qpid project logo are trademarks of The Apache Software Foundation; All other marks mentioned may be trademarks or registered trademarks of their respective owners