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RabbitMQ itself does not have a delay queue function, and it is impossible to directly specify a queue type as a delay queue and then delay processing. There are two implementation schemes: plug-in and function collocation.
Only the second is introduced here. You can combine TTL+DLX to form a delay queue.
Case
If no payment is made within 20 minutes after the order is placed, the order will be closed. If RabbitMQ is used, TTL+DLX must be combined.
solution
First set the order message to a 15-minute TTL, and when the time expires, the queue will forward the message to DLX, and then distribute the message to the bound queue we configured, and then define the consumer to consume the message in this queue, and the delay is achieved. It takes 15 minutes to consume.
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