如何用Java确认RabbitMQ消息？

Question

I tried to figure out how to confirm messages in java but I haven't understood it.
Here is the official RabbitMQ example:
http://hg.rabbitmq.com/rabbitmq-java-client/file/default/test/src/com/rabbitmq/examples/ConfirmDontLoseMessages.java

The problem is that they use 10000 messages to send to an queue and only after that they wait when all messages will be confirmed. I need to send 1 message and only one message per thread and confirm it (In my case I have several equal publishers that have to send messages from time to time). How to confirm one message (not confirm all messages)?

I need something like:

for (long i = 0; i < MSG_COUNT; ++i) {
    ch.basicPublish("", QUEUE_NAME,
                   MessageProperties.PERSISTENT_BASIC,
                   "nop".getBytes());
    ch.wait_for_confirm();
    if(ch.isConfirmed){
        //OK
    }
    else{
        //Republish
    }
}

Answer 1

Read this post:

http://www.rabbitmq.com/blog/2011/02/10/introducing-publisher-confirms/

In short you can use the tx-transactions : ch.txSelect(); for (int i = 0; i < MSG_COUNT; ++i) { ch.basicPublish("", QUEUE_NAME, MessageProperties.PERSISTENT_BASIC, "nop".getBytes()); ch.txCommit(); } ch.txSelect(); for (int i = 0; i < MSG_COUNT; ++i) { ch.basicPublish("", QUEUE_NAME, MessageProperties.PERSISTENT_BASIC, "nop".getBytes()); ch.txCommit(); }

or the publish-confirmation handler:

ch.addConfirmListener(new ConfirmListener() {....}

The first one is easier but slower than the second one.

Answer 2

您应该对每条消息都使用“确认”，您可以检查以下链接： https : //www.rabbitmq.com/confirms.html