如何检查 RabbitMQ 消息队列是否存在?

问题描述

如何检查消息队列是否已经存在?

How can I check whether a message Queue already exists or not?

我有 2 个不同的应用程序，一个创建队列，另一个从该队列读取.

I have 2 different applications, one creating a queue and the other reading from that queue.

所以如果我运行首先从队列中读取的客户端，它就会崩溃.
所以为了避免这种情况，我想先检查队列是否存在.

So if I run the Client which reads from the queue first, than it crashes.
So to avoid that i would like to check first whether the queue exists or not.

这是我如何读取队列的代码片段:

here is the code snippet of how I read the queue:

QueueingBasicConsumer <ConsumerName> = new QueueingBasicConsumer(<ChannelName>); 
<ChannelName>.BasicConsume("<queuename>", null, <ConsumerName>); 
BasicDeliverEventArgs e = (BasicDeliverEventArgs)<ConsumerName>.Queue.Dequeue();

推荐答案

不用检查了.

queue.declare 是幂等操作.所以，如果你运行一次，两次，N次，结果还是一样的.

queue.declare is an idempotent operation. So, if you run it once, twice, N times, the result will still be the same.

如果要确保队列存在，只需在使用前声明即可.确保每次都以相同的持久性、排他性、自动删除性声明它，否则你会得到一个例外.

If you want to ensure that the queue exists, just declare it before using it. Make sure you declare it with the same durability, exclusivity, auto-deleted-ness every time, otherwise you'll get an exception.

如果您确实需要检查队列是否存在(通常不需要)，请对队列进行被动声明.如果队列存在，则该操作成功，如果不存在，则操作失败.

If you actually do need to check if a queue exists (you shouldn't normally need to), do a passive declare of the queue. That operation succeeds if the queue exists, or fails in an error if it doesn't.

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