RabbitMQ-Publisher Confirms

Publisher Confirms

Publisher confirms are a RabbitMQ extension to implement reliable publishing. When publisher confirms are enabled on a channel, messages the client publishes are confirmed asynchronously by the broker, meaning they have been taken care of on the server side.

publisher confirms是一个RabbitMQ的插件用于实现可靠的发布。当publisher confirms在channel上启用时，broker将异步确认客户端发送的信息，意味着服务端接收到了消息。

在channel上启用publisherconfirm

Channel channel = connection.createChannel();
channel.confirmSelect();

publishing Message individually 单独发送消息

    private final static String QUEUE_NAME = "test_queue_confirm1";

    public static void main(String[] args) throws IOException, TimeoutException, InterruptedException {

        Connection connection = ConnectionUtils.getConnection();
        Channel channel = connection.createChannel();
        channel.queueDeclare(QUEUE_NAME,false,false,false,null);

        // 生产者调用confirmSelect将channel设置为confirm模式注意
        channel.confirmSelect();
        String message = "hello confirm message";
        channel.basicPublish("",QUEUE_NAME,null,message.getBytes());
        if(!channel.waitForConfirms()){
            System.out.println("message send failed");
        }else{
            System.out.println("message send ok");
        }
        channel.close();
        connection.close();
    }

publishing messages in batches 批量发送消息

 private final static String QUEUE_NAME = "test_queue_confirm2";

    public static void main(String[] args) throws IOException, TimeoutException, InterruptedException {

        Connection connection = ConnectionUtils.getConnection();
        Channel channel = connection.createChannel();
        channel.queueDeclare(QUEUE_NAME,false,false,false,null);

        // 生产者调用confirmSelect将channel设置为confirm模式注意
        // 批量
        channel.confirmSelect();
        for (int i = 0;i<10;i++) {
            String message = "hello confirm message " + i;
            channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
        }
        if(!channel.waitForConfirms()){
            System.out.println("message send failed");
        }else{
            System.out.println("message send ok");
        }
        channel.close();
        connection.close();
    }

handling publisher confirms asynchronously 异步地处理消息确认

    private final static String QUEUE_NAME = "test_queue_confirm4";
    public static void main(String[] args) throws IOException, TimeoutException {
        Connection connection = ConnectionUtils.getConnection();
        Channel channel = connection.createChannel();
        channel.queueDeclare(QUEUE_NAME,false,false,false,null);
        channel.confirmSelect();
        channel.addConfirmListener(new ConfirmListener() {
            @Override
            public void handleAck(long deliveryTag, boolean multiple) throws IOException {
                System.out.println("handleAck deliveryTag "+deliveryTag+" multiple"+multiple);
            }

            @Override
            public void handleNack(long deliveryTag, boolean multiple) throws IOException {
                System.out.println("handleNack deliveryTag "+deliveryTag+" multiple"+multiple);
            }
        });

        long nextSeqNo = channel.getNextPublishSeqNo();
        channel.basicPublish("",QUEUE_NAME,null,"send listener message".getBytes());
        System.out.println("[send] message" +"send listener message" + "nextSeqNo "+ nextSeqNo );
    }

总结

rabbitMq的ack和publisher confirm需要区分开来。