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#--
# 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.
#++
require 'qpid_proton'
require 'optparse'
require 'pathname'
# Thread safe message queue that notifies waiting senders when messages arrive.
class MessageQueue
def initialize
@lock = Mutex.new # Make ations on the queue atomic
@messages = [] # Messages on the queue
@waiting = [] # Senders that are waiting for messages
end
# Push a message onto the queue and notify any waiting senders
def push(message)
@lock.synchronize do
@messages << message
unless @waiting.empty? # Notify waiting senders
# NOTE: the call to self.send_to is added to the sender's work_queue,
# and will be executed in the sender's thread
@waiting.each { |s| s.work_queue.add { self.send_to(s); } }
@waiting.clear
end
end
end
# Pop a message off the queue.
# If no messages available, record sender as waiting and return nil.
def pop(sender)
@lock.synchronize do
if @messages.empty?
@waiting << sender
nil
else
@messages.shift
end
end
end
# NOTE: Called in sender's thread.
# Pull messages from the queue as long as sender has credit.
# If queue runs out of messages, record sender as waiting.
def send_to(sender)
while sender.credit > 0 && (message = pop(sender))
sender.send(message)
end
end
def forget(sender)
@lock.synchronize { @waiting.delete(sender) }
end
end
# Handler for broker connections. In a multi-threaded application you should
# normally create a separate handler instance for each connection.
class BrokerHandler < Qpid::Proton::MessagingHandler
def initialize(broker)
@broker = broker
end
def on_sender_open(sender)
if sender.remote_source.dynamic?
sender.source.address = SecureRandom.uuid
elsif sender.remote_source.address
sender.source.address = sender.remote_source.address
else
sender.connection.close("no source address")
return
end
q = @broker.queue(sender.source.address)
q.send_to(sender)
end
def on_receiver_open(receiver)
if receiver.remote_target.address
receiver.target.address = receiver.remote_target.address
else
receiver.connection.close("no target address")
end
end
def on_sender_close(sender)
q = @broker.queue(sender.source.address)
q.forget(sender) if q
end
def on_connection_close(connection)
connection.each_sender { |s| on_sender_close(s) }
end
def on_transport_close(transport)
transport.connection.each_sender { |s| on_sender_close(s) }
end
def on_sendable(sender)
@broker.queue(sender.source.address).send_to(sender)
end
def on_message(delivery, message)
@broker.queue(delivery.receiver.target.address).push(message)
end
end
# Broker manages the queues and accepts incoming connections.
class Broker < Qpid::Proton::Listener::Handler
def initialize
@queues = {}
@connection_options = {}
ssl_setup
end
def ssl_setup
# Optional SSL setup
ssl = Qpid::Proton::SSLDomain.new(Qpid::Proton::SSLDomain::MODE_SERVER)
cert_passsword = "tserverpw"
if Gem.win_platform? # Use P12 certs for windows schannel
ssl.credentials("ssl-certs/tserver-certificate.p12", "", cert_passsword)
else
ssl.credentials("ssl-certs/tserver-certificate.pem", "ssl-certs/tserver-private-key.pem", cert_passsword)
end
ssl.allow_unsecured_client # SSL is optional, this is not secure.
@connection_options[:ssl_domain] = ssl if ssl
rescue
# Don't worry if we can't set up SSL.
end
def on_open(l)
STDOUT.puts "Listening on #{l.port}\n"; STDOUT.flush
end
# Create a new BrokerHandler instance for each connection we accept
def on_accept(l)
{ :handler => BrokerHandler.new(self) }.update(@connection_options)
end
def queue(address)
@queues[address] ||= MessageQueue.new
end
end
if ARGV.size != 1
STDERR.puts "Usage: #{__FILE__} URL
Start an example broker listening on URL"
return 1
end
url, = ARGV
container = Qpid::Proton::Container.new
container.listen(url, Broker.new)
# Run the container in multiple threads.
threads = 4.times.map { Thread.new { container.run }}
threads.each { |t| t.join }
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