public void start() throws IOException {
if (channel == null || !channel.isOpen()) {
channel = config.createChannel();
channel.addShutdownListener(this);
channel.basicQos(getPrefetchCount());
config.declareBrokerConfiguration(channel);
consumer = new QueueSubscriber<BasicConsumer<C, T>>(channel, this);
channel.basicConsume(queueName, false, consumer);
}
}
private Channel doCreateBareChannel(
ChannelCachingConnectionProxy connection, boolean transactional) {
Channel channel = connection.createBareChannel(transactional);
if (this.publisherConfirms) {
try {
channel.confirmSelect();
} catch (IOException e) {
logger.error("Could not configure the channel to receive publisher confirms", e);
}
}
if (this.publisherConfirms || this.publisherReturns) {
if (!(channel instanceof PublisherCallbackChannelImpl)) {
channel = new PublisherCallbackChannelImpl(channel);
}
}
if (channel != null) {
channel.addShutdownListener(this);
}
return channel;
}