RabbitMQ - 发布确认

1.发布确认的策略

//开启发布确认
channel.confirmSelect();

2.单个确认发布

/**
 * 单个发送
 */
public static void publishMessageIndividually() throws Exception {
    Channel channel = RabbitMqUtils.getChannel();
    //队列声明
    String queueName = UUID.randomUUID().toString();
    channel.queueDeclare(queueName, true, false, false, null);
    //开启发布确认
    channel.confirmSelect();

    long begin = System.currentTimeMillis();

    for (int i = 0; i < MESSAGE_COUNT; i++) {
        String message = i + "";
        channel.basicPublish("", queueName, null, message.getBytes());
        //服务端返回 false 或超时时间内未返回，生产者可以消息重发
        boolean flag = channel.waitForConfirms();
        if (flag) {
            System.out.println("消息发送成功");
        }
    }

    long end = System.currentTimeMillis();
    System.out.println("发布" + MESSAGE_COUNT + "个单独确认消息,耗时" + (end - begin) + "ms");

}

3.批量确认发布

/**
 * 批量
 */
public static void publishMessageBatch() throws Exception {
    Channel channel = RabbitMqUtils.getChannel();
    //队列声明
    String queueName = UUID.randomUUID().toString();
    channel.queueDeclare(queueName, true, false, false, null);
    //开启发布确认
    channel.confirmSelect();
    //批量确认消息大小
    int batchSize = 100;
    //未确认消息个数
    int outstandingMessageCount = 0;
    long begin = System.currentTimeMillis();

    for (int i = 0; i < MESSAGE_COUNT; i++) {
        String message = i + "";
        channel.basicPublish("", queueName, null, message.getBytes());
        outstandingMessageCount++;
        if (outstandingMessageCount == batchSize) {
            channel.waitForConfirms();
            outstandingMessageCount = 0;
        }
    }
    //为了确保还有剩余没有确认消息 再次确认
    if (outstandingMessageCount > 0) {
        channel.waitForConfirms();
    }
    long end = System.currentTimeMillis();
    System.out.println("发布" + MESSAGE_COUNT + "个批量确认消息,耗时" + (end - begin) + "ms");
}

4.异步确认发布