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update README

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Emiel Bruijntjes 2022-11-23 22:21:22 +01:00
parent d1be1063a5
commit a0cac01476
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README.md
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@ -1374,10 +1374,18 @@ auto messageCb = [&channel](const AMQP::Message &message, uint64_t deliveryTag,
channel.ack(deliveryTag); channel.ack(deliveryTag);
}; };
// callback that is called when the consumer is cancelled by RabbitMQ (this only happens in
// rare situations, for example when someone removes the queue that you are consuming from)
auto cancelledCb = [](const std::string &consumertag) {
std::cout << "consume operation cancelled by the RabbitMQ server" << std::endl;
};
// start consuming from the queue, and install the callbacks // start consuming from the queue, and install the callbacks
channel.consume("my-queue") channel.consume("my-queue")
.onReceived(messageCb) .onReceived(messageCb)
.onSuccess(startCb) .onSuccess(startCb)
.onCancelled(cancelledCb)
.onError(errorCb); .onError(errorCb);
```` ````
@ -1400,7 +1408,10 @@ This method is very simple and takes in its simplest form only one parameter: th
Consuming messages is a continuous process. RabbitMQ keeps sending messages, until Consuming messages is a continuous process. RabbitMQ keeps sending messages, until
you stop the consumer, which can be done by calling the `Channel::cancel()` method. you stop the consumer, which can be done by calling the `Channel::cancel()` method.
If you close the channel, or the entire TCP connection, consuming also stops. If you close the channel, or the entire TCP connection, the consumer also stops.
In some (rare) situations, the consume operation can also be cancelled by the RabbitMQ
server. This for example happens when a queue is removed or becomes unavailable. To
handle this scenario you can install a "onCancelled" callback.
RabbitMQ throttles the number of messages that are delivered to you, to prevent RabbitMQ throttles the number of messages that are delivered to you, to prevent
that your application is flooded with messages from the queue, and to spread out that your application is flooded with messages from the queue, and to spread out