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                ## 死信隊列 1. DLX,Dead-Letter-Exchange; 2. 應用DLX,當消息再一個隊列中變成死信(dead message)之后,它能被重新publish到另外一個exchange,這個exchange就是DLX; ## 消息變為死信隊列的集中情況 1. 消息被拒絕(basic.reject/basic.nack) 并且requeue=false; 2. 消息TTL過期; 3. 隊列達到最大長度; ## DLX 1. DLX也是一個正常的exchange,和一般的exchange沒有區別,它能在任何隊列上被指定,實際上就是設置某個隊列的屬性; 2. 當這個隊列中有死信時,rabbitmq就會自動將這個消息重新發布到設置的exchange上去,進而被路由到另一個隊列; 3. 可以監聽這個隊列中消息做相應的處理,這個特性可以彌補rabbitmq3.0以前支持的immediate參數的功能; ## 設置死信隊列 首先需要設置死信隊列的exchange和queue,然后進行綁定; 1. exchange : dlx.exchange; 2. queue:dlx.queue; 3. routingkey : # 4. 然后我們進行正常聲明交換機,隊列,綁定,只不過我們需要在隊列加上一個參數即可: argments.put("x-dead-letter-exchange","dlx,exchange").;
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