Spring - Redis

 1package com.demo.project56.config;
 2
 3import com.demo.project56.service.MessageListener;
 4import org.springframework.context.annotation.Bean;
 5import org.springframework.context.annotation.Configuration;
 6import org.springframework.data.redis.connection.RedisConnectionFactory;
 7import org.springframework.data.redis.core.RedisTemplate;
 8import org.springframework.data.redis.core.StringRedisTemplate;
 9import org.springframework.data.redis.listener.ChannelTopic;
10import org.springframework.data.redis.listener.PatternTopic;
11import org.springframework.data.redis.listener.RedisMessageListenerContainer;
12import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;
13import org.springframework.data.redis.serializer.StringRedisSerializer;
14
15@Configuration
16public class RedisConfiguration {
17    @Bean
18    public RedisTemplate<String, Long> redisTemplate(RedisConnectionFactory connectionFactory) {
19        RedisTemplate<String, Long> template = new RedisTemplate<>();
20        template.setConnectionFactory(connectionFactory);
21        template.setDefaultSerializer(new StringRedisSerializer());
22        return template;
23    }
24
25    @Bean
26    RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory, MessageListenerAdapter listenerAdapter) {
27        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
28        container.setConnectionFactory(connectionFactory);
29        container.addMessageListener(listenerAdapter, new PatternTopic("chat"));
30        return container;
31    }
32
33    @Bean
34    MessageListenerAdapter listenerAdapter(MessageListener messageListener) {
35        return new MessageListenerAdapter(messageListener, "receiveMessage");
36    }
37
38    @Bean
39    MessageListener messageConsumer() {
40        return new MessageListener();
41    }
42
43    @Bean
44    StringRedisTemplate template(RedisConnectionFactory connectionFactory) {
45        return new StringRedisTemplate(connectionFactory);
46    }
47
48}

 1package com.demo.project56.controller;
 2
 3import com.demo.project56.domain.Customer;
 4import com.demo.project56.repository.CustomerRepository;
 5import lombok.RequiredArgsConstructor;
 6import lombok.extern.slf4j.Slf4j;
 7import org.springframework.data.redis.core.RedisTemplate;
 8import org.springframework.data.redis.core.StringRedisTemplate;
 9import org.springframework.web.bind.annotation.GetMapping;
10import org.springframework.web.bind.annotation.PathVariable;
11import org.springframework.web.bind.annotation.PostMapping;
12import org.springframework.web.bind.annotation.RequestBody;
13import org.springframework.web.bind.annotation.RestController;
14
15@RestController
16@Slf4j
17@RequiredArgsConstructor
18public class HomeController {
19
20    private final RedisTemplate<String, Long> counterTemplate;
21    private final StringRedisTemplate chatTemplate;
22    private final CustomerRepository customerRepository;
23
24    @GetMapping("/api/send/{message}")
25    public void sendMessage(@PathVariable String message) {
26        log.info("Sending message {}", message);
27        chatTemplate.convertAndSend("chat", message);
28    }
29
30    @GetMapping("/api/inc")
31    public Long incrementCounter() {
32        return counterTemplate.opsForValue().increment("chat");
33    }
34
35    @PostMapping("/api/customer")
36    public Customer saveCustomer(@RequestBody Customer customer) {
37        return customerRepository.save(customer);
38    }
39
40    @GetMapping("/api/customer")
41    public Iterable<Customer> getCustomers() {
42        return customerRepository.findAll();
43    }
44
45    @GetMapping("/api/send-queue/{message}")
46    public void sendToQueue(@PathVariable String message) {
47        log.info("Sending to queue {}", message);
48        chatTemplate.opsForList().leftPush("app-key", message);
49    }
50
51    @GetMapping("/api/get-queue")
52    public String getFromQueue() {
53        return chatTemplate.opsForList().leftPop("app-key");
54    }
55
56}

 1# Project 56
 2
 3Spring & Redis (Messaging + Data)
 4
 5[https://gitorko.github.io/spring-redis/](https://gitorko.github.io/spring-redis/)
 6
 7### Version
 8
 9Check version
10
11```bash
12$java --version
13openjdk version "21.0.3" 2024-04-16 LTS
14```
15
16### Redis
17
18```bash
19docker run --rm --name my-redis -p 6379:6379 -d redis redis-server --requirepass "password"
20
21```
22
23To bring up Redis and Redis Commander UI
24
25```bash
26docker-compose -f docker/docker-compose-redis.yaml up
27```
28
29Open Redis UI [http://localhost:8081/](http://localhost:8081/)
30
31### Dev
32
33To run the backend in dev mode.
34
35```bash
36./gradlew clean build
37./gradlew bootRun
38```