Question

我已经设置了RabbitMQ并且能够立即从rails应用程序发布和使用带有bunny gem的消息。在发布到RabbitMQ时，我们如何通过每个消息的预定延迟时间实现延迟排队交换？

Answer 1

使用RabbitMQ延迟消息交换插件 有一个插件可用于延迟消息，RabbitMQ delayed messages exchange plugin。此插件向RabbitMQ添加新的交换类型，并且路由到该交换的消息可以延迟指定的时间量。

合并TTL和DLX以延迟邮件传递 另一种选择是结合TTL和DLX来延迟消息传递。通过将这些组合到函数中，我们将消息发布到队列，该队列将在TTL之后使其消息到期，然后将其重新路由到交换机并使用死信路由密钥，以便它们最终进入我们消耗的队列。

require 'bunny'

B = Bunny.new ENV['CONNECTION_URL']
B.start

DELAYED_QUEUE='work.later'
DESTINATION_QUEUE='work.now'

def publish
  ch = B.create_channel
  # declare a queue with the DELAYED_QUEUE name
  ch.queue(DELAYED_QUEUE, arguments: {
    # set the dead-letter exchange to the default queue
    'x-dead-letter-exchange' => '',
    # when the message expires, set change the routing key into the destination queue name
    'x-dead-letter-routing-key' => DESTINATION_QUEUE,
    # the time in milliseconds to keep the message in the queue
    'x-message-ttl' => 3000
  })
  # publish to the default exchange with the the delayed queue name as routing key,
  # so that the message ends up in the newly declared delayed queue
  ch.default_exchange.publish 'message content', routing_key: DELAYED_QUEUE
  puts "#{Time.now}: Published the message"
  ch.close
end

def subscribe
  ch = B.create_channel
  # declare the destination queue
  q = ch.queue DESTINATION_QUEUE, durable: true 
  q.subscribe do |delivery, headers, body|
    puts "#{Time.now}: Got the message"
  end
end

subscribe()
publish()

sleep

如下所述：https://www.cloudamqp.com/docs/delayed-messages.html

我们如何设置Bunny gem和RabbitMQ的延迟排队？

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