1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
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.
#
from __future__ import print_function
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
|
