RabbitMq

为啥要用rabbitmq

1，松耦合结构(解耦，异步处理，缓冲能力，伸缩性，扩展性）

2，性能是万级的

rabbitmq的生产者：
rabbitmq的生产者如何保证数据安全问题：

1,发送者确认

2，失败者通知
rabbitmq的消费者
rabbitmq的消费者如何保证数据安全问题：

1，手动消费确认
rabbitmq与springboot的集成：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-amqp</artifactId>
</dependency>

package touchbase.infrastructure.common.config.rabbitmq;


import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * 1,使用顺序
 */
@Configuration
public class RabbitMqConfig {
    @Value("${touchbase.rabbitmq.host}")
    private String host;
    @Value("${touchbase.rabbitmq.port}")
    private String port;
    @Value("${touchbase.rabbitmq.username}")
    private String username;
    @Value("${touchbase.rabbitmq.password}")
    private String password;
    @Value("${touchbase.rabbitmq.virtual-host}")
    private String virtualhost;

    @Bean
    public ConnectionFactory connectionFactory() {
        CachingConnectionFactory connectionFactory = new CachingConnectionFactory();
        connectionFactory.setAddresses(host + ":" + port);
        connectionFactory.setUsername(username);
        connectionFactory.setPassword(password);
        connectionFactory.setVirtualHost(virtualhost);
        return connectionFactory;
    }
}

生产者：

package touchbase.infrastructure.common.config.rabbitmq;

import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.DirectExchange;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.connection.CorrelationData;
import org.springframework.amqp.rabbit.core.RabbitAdmin;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.annotation.PostConstruct;

@Configuration
public class RabbitMqProducerConfig {

    @Autowired
    private ConnectionFactory connectionFactory;

    @PostConstruct
    public void init() {
        // 如果交换器，队列未创建，可以通过RabbitAdmin进行创建
        RabbitAdmin rabbitAdmin = new RabbitAdmin(connectionFactory);
        DirectExchange directExchange = new DirectExchange("cmpn.strategy");
        rabbitAdmin.declareExchange(directExchange);

        Queue weChatQueue = new Queue("touch.channel.wechatassis");
        rabbitAdmin.declareQueue(weChatQueue);
        rabbitAdmin.declareBinding(BindingBuilder.bind(weChatQueue).to(directExchange)
                .with("touch.channel.wechatassis"));
    }

    //使用template
    @Bean
    public RabbitTemplate rabbitTemplate() {
        RabbitTemplate template = new RabbitTemplate(connectionFactory);
        //失败通知(在不可路由的情况下)
        template.setMandatory(true);
        //发送方确认
        template.setConfirmCallback(confirmCallback());
        //失败回调
        template.setReturnCallback(returnCallback());
        return template;
    }

    /*使用了RabbitMq系统的缺省的交换器(direct交换器：完全匹配)*/
    //申明队列
    @Bean
    public Queue weChatAssisQueue() {
        return new Queue("touch.channel.wechatassis");
    }

    /*生产者发送确认*/
    @Bean
    public RabbitTemplate.ConfirmCallback confirmCallback() {
        return new RabbitTemplate.ConfirmCallback() {
            @Override
            public void confirm(CorrelationData correlationData, boolean ack, String cause) {
                if (ack) {
                    System.out.println("发送者确认发送给mq成功");
                } else {
                    //处理失败的消息
                    System.out.println("发送者发送给给mq失败，考虑重发:" + cause);
                }

            }
        };
    }

    /*失败者通知*/
    @Bean
    public RabbitTemplate.ReturnCallback returnCallback() {
        return new RabbitTemplate.ReturnCallback() {
            @Override
            public void returnedMessage(Message message,
                                        int replyCode,
                                        String replyText,
                                        String exchange,
                                        String routingKey) {
                System.out.println("无法路由的消息，需要考虑另外处理");
                System.out.println("returned replyText:" + replyText);
                System.out.println("returned exchange:" + exchange);
                System.out.println("returned routingKey:" + routingKey);
                String msgJson = new String(message.getBody());
                System.out.println("Returned Message:" + msgJson);
            }
        };
    }
}

消费者：

package touchbase.infrastructure.common.config.rabbitmq;

import org.springframework.amqp.core.AcknowledgeMode;
import org.springframework.amqp.rabbit.config.SimpleRabbitListenerContainerFactory;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class RabbitMqConsumerConfig {

    @Autowired
    private ConnectionFactory connectionFactory;

    /**
     * @Description: SimpleMessageListenerContainer的工厂類
     * @Author rty
     * @Date: 2023/10/21 23:42
     * @Version 1.0
     */
    @Bean
    public SimpleRabbitListenerContainerFactory simpleRabbitListenerContainerFactory() {
        SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
        factory.setConnectionFactory(connectionFactory);
        factory.setAcknowledgeMode(AcknowledgeMode.MANUAL);
        //设置当前的消费者数量
        factory.setConcurrentConsumers(1);
        //设置当前的消费者数量上限
        factory.setMaxConcurrentConsumers(5);
        //设置是否重回队列
        factory.setDefaultRequeueRejected(true);
        return factory;
    }
}

package touchbase.adapter.message;

import com.alibaba.fastjson.JSONObject;
import com.google.common.collect.Lists;
import com.rabbitmq.client.Channel;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import touchbase.application.dto.common.FlowDataDTO;
import touchbase.application.service.channeltask.ChannelTaskService;

import java.io.IOException;
import java.util.List;

/**
 * @Description: 渠道任务的消费
 * @Author rty
 * @Date: 2023/10/21 15:36
 * @Version 1.0
 */
@Component
@Slf4j
public class ChannelTaskConsumer {

    public static final String WECHATASSIS = "WECHATASSIS";

    @Autowired
    private ChannelTaskService channelTaskService;

    @RabbitListener(containerFactory = "simpleRabbitListenerContainerFactory", queues = "touch.channel.wechatassis")
    @RabbitHandler
    public void dealWeChatChannelTaskConsumer(List<Message> messages, Channel channel) throws IOException {
        long deliveryTag = 0l;
        try {
            for (Message message : messages) {
                String flowDataString = new String(message.getBody());
                log.info("企微专员任务流转", flowDataString);
                deliveryTag = message.getMessageProperties().getDeliveryTag();
                channelTaskService.dealChannelChannelTask(JSONObject.parseArray(flowDataString, FlowDataDTO.class),
                        WECHATASSIS);
            }
        } catch (Exception e) {
            log.error("企微专员任务流转失败，{}", e);
            //basicReject一次只能拒绝接收一个消息,basicNack方法可以支持一次0个或多个消息的拒收
        } finally {
            channel.basicAck(deliveryTag, false);
        }
    }
}