text: #!/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 sys
  import threading
  from proton.reactor import ApplicationEvent, Container
  from proton.handlers import MessagingHandler, TransactionHandler
  
  class TxRecv(MessagingHandler, TransactionHandler):
      def __init__(self):
          super(TxRecv, self).__init__(prefetch=0, auto_accept=False)
  
      def on_start(self, event):
          self.container = event.container
          self.conn = self.container.connect("localhost:5672")
          self.receiver = self.container.create_receiver(self.conn, "examples")
          self.container.declare_transaction(self.conn, handler=self, settle_before_discharge=True)
          self.transaction = None
  
      def on_message(self, event):
          print(event.message.body)
          self.transaction.accept(event.delivery)
  
      def on_transaction_declared(self, event):
          self.transaction = event.transaction
          print("transaction declared")
  
      def on_transaction_committed(self, event):
          print("transaction committed")
          self.container.declare_transaction(self.conn, handler=self)
  
      def on_transaction_aborted(self, event):
          print("transaction aborted")
          self.container.declare_transaction(self.conn, handler=self)
  
      def on_commit(self, event):
          self.transaction.commit()
  
      def on_abort(self, event):
          self.transaction.abort()
  
      def on_fetch(self, event):
          self.receiver.flow(1)
  
      def on_quit(self, event):
          c = self.receiver.connection
          self.receiver.close()
          c.close()
  
  try:
      reactor = Container(TxRecv())
      events = reactor.get_event_trigger()
      thread = threading.Thread(target=reactor.run)
      thread.daemon=True
      thread.start()
  
      print("Enter 'fetch', 'commit' or 'abort'")
      while True:
          line = sys.stdin.readline()
          if line:
              events.trigger(ApplicationEvent(line.strip()))
          else:
              break
  except KeyboardInterrupt: pass
  
  
  