added configuration file for redis

src/main/java/eu/dnetlib/repo/manager/config/RedisConfig.java

@@ -0,0 +1,49 @@
+package eu.dnetlib.repo.manager.config;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.redis.connection.RedisConnectionFactory;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.listener.RedisMessageListenerContainer;
+import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
+import org.springframework.data.redis.serializer.StringRedisSerializer;
+
+@Configuration
+public class RedisConfig {
+
+    private static final Logger logger = LoggerFactory.getLogger(RedisConfig.class);
+
+    /**
+     * Custom RedisTemplate using as Value serializer the {@link Jackson2JsonRedisSerializer}
+     * to avoid serialization issues between versions.
+     *
+     * @param connectionFactory the redis connection factory
+     * @return
+     */
+    @Bean
+    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
+        RedisTemplate<String, Object> template = new RedisTemplate<>();
+        template.setConnectionFactory(connectionFactory);
+        template.setValueSerializer(new Jackson2JsonRedisSerializer<>(Object.class));
+        template.setKeySerializer(new StringRedisSerializer());
+        return template;
+    }
+
+    /**
+     * Custom RedisMessageListenerContainer to override error handling behaviour.
+     *
+     * @param connectionFactory the redis connection factory
+     * @return
+     */
+    @Bean
+    public RedisMessageListenerContainer redisMessageListenerContainer(RedisConnectionFactory connectionFactory) {
+        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
+        container.setConnectionFactory(connectionFactory);
+        container.setErrorHandler(e -> {
+            logger.error("An error occurred in Redis message listener: " + e.getMessage());
+        });
+        return container;
+    }
+}