Added publish subscribe example using redis

spring-data-redis/src/main/java/org/baeldung/spring/data/redis/config/RedisConfig.java

@@ -1,10 +1,16 @@
 package org.baeldung.spring.data.redis.config;
 
+import org.baeldung.spring.data.redis.queue.RedisMessageSubscriber;
+import org.baeldung.spring.data.redis.queue.RedisMessagePublisher;
+import org.baeldung.spring.data.redis.queue.MessagePublisher;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
 import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.listener.ChannelTopic;
+import org.springframework.data.redis.listener.RedisMessageListenerContainer;
+import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;
 
 @Configuration
 @ComponentScan("org.baeldung.spring.data.redis")
@@ -17,8 +23,31 @@ public class RedisConfig {
 
     @Bean
     public RedisTemplate<String, Object> redisTemplate() {
-        final RedisTemplate< String, Object> template =  new RedisTemplate<String, Object>();
+        final RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
         template.setConnectionFactory(jedisConnectionFactory());
         return template;
     }
+
+    @Bean
+    MessageListenerAdapter messageListener() {
+        return new MessageListenerAdapter(new RedisMessageSubscriber());
+    }
+
+    @Bean
+    RedisMessageListenerContainer redisContainer() {
+        final RedisMessageListenerContainer container = new RedisMessageListenerContainer();
+        container.setConnectionFactory(jedisConnectionFactory());
+        container.addMessageListener(messageListener(), topic());
+        return container;
+    }
+
+    @Bean
+    MessagePublisher redisPublisher() {
+        return new RedisMessagePublisher(redisTemplate(), topic());
+    }
+
+    @Bean
+    ChannelTopic topic() {
+        return new ChannelTopic("pubsub:queue");
+    }
 }

spring-data-redis/src/main/java/org/baeldung/spring/data/redis/queue/MessagePublisher.java

@@ -0,0 +1,7 @@
+package org.baeldung.spring.data.redis.queue;
+
+
+public interface MessagePublisher {
+
+    void publish(String message);
+}

spring-data-redis/src/main/java/org/baeldung/spring/data/redis/queue/RedisMessagePublisher.java

@@ -0,0 +1,28 @@
+package org.baeldung.spring.data.redis.queue;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.listener.ChannelTopic;
+import org.springframework.stereotype.Service;
+
+@Service
+public class RedisMessagePublisher implements MessagePublisher {
+
+    @Autowired
+    private RedisTemplate<String, Object> redisTemplate;
+    @Autowired
+    private ChannelTopic topic;
+
+    public RedisMessagePublisher() {
+    }
+
+    public RedisMessagePublisher(RedisTemplate<String, Object> redisTemplate,
+                                 ChannelTopic topic) {
+        this.redisTemplate = redisTemplate;
+        this.topic = topic;
+    }
+
+    public void publish(String message) {
+        redisTemplate.convertAndSend(topic.getTopic(), message);
+    }
+}

spring-data-redis/src/main/java/org/baeldung/spring/data/redis/queue/RedisMessageSubscriber.java

@@ -0,0 +1,19 @@
+package org.baeldung.spring.data.redis.queue;
+
+import org.springframework.data.redis.connection.Message;
+import org.springframework.data.redis.connection.MessageListener;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Service
+public class RedisMessageSubscriber implements MessageListener {
+
+    public static List<String> messageList = new ArrayList<String>();
+
+    public void onMessage(final Message message, final byte[] pattern) {
+        messageList.add(message.toString());
+        System.out.println("Message received: " + message.toString());
+    }
+}

spring-data-redis/src/main/java/org/baeldung/spring/data/redis/repo/StudentRepository.java

@@ -1,15 +1,13 @@
 package org.baeldung.spring.data.redis.repo;
 
 import org.baeldung.spring.data.redis.model.Student;
-import org.springframework.data.redis.core.RedisTemplate;
-import org.springframework.stereotype.Component;
 
 import java.util.Map;
 
 public interface StudentRepository {
 
     void saveStudent(Student person);
-    
+
     void updateStudent(Student student);
 
     Student findStudent(String id);