上一篇演示了通过jedis的api进行发布订阅消息的案例，但是只是单订阅方和消费方，本篇演示多个消息发布方，单个消息订阅方的场景。

import org.junit.Test;
import redis.clients.jedis.JedisPubSub;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

/**
 * @Author fanchunshuai
 * @Date 2020/1/3 19
 * @Description:
 * 参考 ： https://blog.csdn.net/yuan52007298/article/details/99320123
 * 多个消息发布方，单个消息订阅方
 */
public class MultSubPubTest extends ClusterTest
{
    private static final String WEIXIN = "WEIXIN";
    private static final String QQ = "QQ";

    /**
     * 再启动发布方
     */
    @Test
    public void testPublish(){
        //多个消息发布方
        Long count = cluster.publish(WEIXIN,"您有一条微信技术文章.");
        System.out.println("count = "+count);
        Long count2 = cluster.publish(QQ,"在吗?张三,有个问题请教.");
        System.out.println("count2 = "+count2);
    }

    /**
     * 先启动订阅方
     * 如果发布方晚于订阅方启动，订阅方无法知道消息
     */
    @Test
    public void testSubscribe(){
        //这种方式存在阻塞，redis重启会导致订阅中断，使用下面的线程池方式
        //cluster.subscribe(new WeixinSubscribe(),TOPIC);
        //下面使用第二种方式
        try {
            //单个消息订阅方
            Executors.newSingleThreadScheduledExecutor().
                    scheduleWithFixedDelay(new Thread(()->{
                        System.out.println("恢复订阅........");
                        cluster.subscribe(new MutilSubscribeOne(),QQ,WEIXIN);

                    },"jedis subscribe thread"),0L,1000L, TimeUnit.MILLISECONDS).get();

        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
    }

}

/**
 * 自定义订阅类
 */
class MutilSubscribeOne extends JedisPubSub{
    @Override
    public void onMessage(String channel, String message) {
        System.out.println("channel = "+channel+",message = "+message);

    }

    @Override
    public void onSubscribe(String channel, int subscribedChannels) {
        System.out.println("channel = "+channel+",subscribedChannels = "+subscribedChannels);
    }
}