4dkankan-utils/4dkankan-utils-rabbitmq/src/main/java/com/fdkankan/rabbitmq/util/RabbitMqProducer.java

package com.fdkankan.rabbitmq.util;

import cn.hutool.json.JSONObject;
import com.fdkankan.rabbitmq.config.ModelingQueueConfig;
import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.AMQP.Queue.DeclareOk;
import com.rabbitmq.client.Channel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.connection.CorrelationData;
import org.springframework.amqp.rabbit.core.ChannelCallback;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.UUID;

/**
 * <p>
 * TODO
 * </p>
 *
 * @author dengsixing
 * @since 2022/4/19
 **/
@Component
public class RabbitMqProducer {

    private Logger log = LoggerFactory.getLogger(this.getClass().getName());

    @Autowired
    ModelingQueueConfig modelingQueueConfig;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    /**
     * 工作队列模式发送消息
     * @param queue 队列名
     * @param content 载荷
     */
    public void sendByWorkQueue(String queue, Object content){
        String messageId = UUID.randomUUID().toString();
        log.info("开始发送Mq消息，messageId:{},消息队列：{}，消息内容：{}",messageId, queue, new JSONObject(content).toString());
        rabbitTemplate.convertAndSend(queue, content, message -> {
            message.getMessageProperties().setMessageId(messageId);
            return message;
        }, new CorrelationData(messageId));
    }

    /**
     * 工作队列模式发送带优先级消息
     * @param queue 队列名
     * @param content 载荷
     * @param priority 优先级，正整数，值越大优先级越高，当值大于队列设置的最大优先级时，效果等同于最大优先级
     */
    public void sendByWorkQueue(String queue, Object content, Integer priority){
        String messageId = UUID.randomUUID().toString();
        log.info("开始发送Mq消息，messageId:{},消息队列：{}，消息内容：{}",messageId, queue, new JSONObject(content).toString());
        rabbitTemplate.convertAndSend(queue, content, message -> {
            message.getMessageProperties().setMessageId(messageId);
            message.getMessageProperties().setPriority(priority);
            return message;
        }, new CorrelationData(messageId));
    }

    /**
     * 获取队列未被消费的消息数量
     * @return
     */
    public int getMessageCount(String queueName) {
        AMQP.Queue.DeclareOk declareOk = rabbitTemplate.execute(new ChannelCallback<DeclareOk>() {
            public AMQP.Queue.DeclareOk doInRabbit(Channel channel) throws Exception {
                return channel.queueDeclarePassive(queueName);
            }
        });

        return declareOk.getMessageCount();
    }



}