Re-learn Java | from source to learn springboot redis use

Spring boot2.x system after redisswitching becomes Lettucerealized. In order to fit the Spring bootidea and advantages of automatic assembly, try to use the time to use the system already provided, and if not then in your own custom-related beanobjects.

Redis Introduction

Redis is an open source use written in ANSI C, support network, based on the persistence of memory can log type, Key-Value database, and provides multi-lingual API. It supports Memcached compared to relatively more storage type (character, hash, sets, ordered sets, lists, GEO), while Redis is thread-safe. Since March 15, 2010, Redis development work was hosted by VMware, 2013 began in May, Redis development sponsored by Pivotal.

Lettuce & Jedis

Lettuce and Jedis are connected to the client program Redis Server. Jedis on implementation is directly connected redis server, multi-threaded environment, non-thread-safe, unless you are using a connection pool, increase physical connection for each instance of Jedis. Lettuce based Netty connection example of (StatefulRedisConnection), may concurrently access among multiple threads, and thread-safe, concurrent access to meet in a multithreaded environment, and it is scalable design, a connection instance can not be enough demand increase the connection instance.

Import dependence

In pom.xmladd spring-boot-starter-data-redis-dependent, in Spring boot 2.xlater versions provide the underlying default implementation is to use Lettuceinstead jedis. However 两种方式都提供的默认的实现, you can choose according to their own version of the project

lettuce version

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-pool2</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>
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jedis version

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
    <exclusions>
        <exclusion>
            <groupId>io.lettuce</groupId>
            <artifactId>lettuce-core</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-pool2</artifactId>
</dependency>
<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>
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Configuration Properties

In application.yamladd the following, the corresponding source code can be found hereorg.springframework.boot.autoconfigure.data.redis.RedisProperties

spring:
  redis:
    host: 192.168.123.225
    database: 0
    port: 6379
    password:
    # 保留一个
    lettuce:
      pool:
        max-active: 8
        max-wait: -1ms
        max-idle: 8
        min-idle: 1
    jedis:
      pool:
        max-active: 8
        max-wait: -1ms
        max-idle: 8
        min-idle: 1
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redis automatic configuration View

In front of me have said, to make use of Springalready provided a good bean, specific location org.springframework.boot.autoconfigure.data.redis.RedisAutoConfigurationat this time found that Springhas helped us to automatically inject redisTemplate StringRedisTemplate RedisConnectionFactorythis time the default does not meet our general demand, this time only need to define one RedisTemplatecan, without the need All objects have their own re-custom, Lettuceand Jedisis the realization of their own, just add or exclude specific java class can be switched to their differentRedisConnectionFactory

@Configuration
@ConditionalOnClass({RedisOperations.class})
@EnableConfigurationProperties({RedisProperties.class})
@Import({LettuceConnectionConfiguration.class, JedisConnectionConfiguration.class})
public class RedisAutoConfiguration {
    public RedisAutoConfiguration() {
    }

    @Bean
    @ConditionalOnMissingBean(
        name = {"redisTemplate"}
    )
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
        RedisTemplate<Object, Object> template = new RedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }

    @Bean
    @ConditionalOnMissingBean
    public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
        StringRedisTemplate template = new StringRedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }
}

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Partial block

@Configuration
@ConditionalOnClass({GenericObjectPool.class, JedisConnection.class, Jedis.class})
class JedisConnectionConfiguration extends RedisConnectionConfiguration {
...

@Configuration
@ConditionalOnClass({RedisClient.class})
class LettuceConnectionConfiguration extends RedisConnectionConfiguration {
    private final RedisProperties properties;
...
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Test code directly see here will be able to learn together SpringBoot | CHAPTER 9: Lettuce Redis integration

Reference article

• Together to learn SpringBoot | CHAPTER 9: Lettuce Redis integration
• Spring Data Redis