rabbitmq使用dead letter机制来进行retry
rabbitmq使用dead letter机制来进行retry首先建立 工作exchange和工作queue，指定工作队列的x-dead-letter-exchange到重试exchenge
var workQueueArgs = new Dictionary<string, object> {
{ "x-dead-letter-exchange", RETRY_EXCHANGE },
};
channel.ExchangeDeclare(WORK_EXCHANGE, "direct");
channel.QueueDeclare(WORK_QUEUE, true, false, false, workQueueArgs);
channel.QueueBind(WORK_QUEUE, WORK_EXCHANGE, "", null);
之后建立重试exchange和重试queue
var queueArgs = new Dictionary<string, object> {
{ "x-dead-letter-exchange", WORK_EXCHANGE },
{ "x-message-ttl", RETRY_DELAY }
};
channel.ExchangeDeclare(RETRY_EXCHANGE, "direct");
channel.QueueDeclare(RETRY_QUEUE, true, false, false, queueArgs);
channel.QueueBind(RETRY_QUEUE, RETRY_EXCHANGE, "", null);
重试队列需要2个属性，一个是 x-dead-letter-exchange，指向到工作exchange
一个是过期时间（这里等于是多少秒后重试）
监听工作队列，处理消息
QueueingBasicConsumer consumer = new QueueingBasicConsumer(channel);
channel.BasicConsume(WORK_QUEUE, false, consumer);
while (true)
{
BasicDeliverEventArgs e = (BasicDeliverEventArgs)consumer.Queue.Dequeue();
var message = Encoding.UTF8.GetString(e.Body);
try
{
//throw new Exception("");
channel.BasicAck(e.DeliveryTag, false);
}
catch
{
channel.BasicNack(e.DeliveryTag, false, false);
}
}
处理成功调用ack，处理不成功调用nack，
调用nack后，会根据工作队列的x-dead-letter-exchange自动把消息发到重试队列
重试队列等几秒（x-message-ttl）后，就认为是自动失败了，又会根据重试队列的x-dead-letter-exchange发送回工作队列
http://www.cnblogs.com/czcz1024/p/4195606.html
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