How do you implement custom auto-configuration?

Create auto-configuration class:\n\n@Configuration\n@ConditionalOnClass(RedisTemplate.class)\n@EnableConfigurationProperties(RedisProperties.class)\npublic class RedisAutoConfiguration {\n \n @Bean\n @ConditionalOnMissingBean\n public RedisConnectionFactory redisConnectionFactory(RedisProperties properties) {\n LettuceConnectionFactory factory = new LettuceConnectionFactory(\n properties.getHost(), properties.getPort());\n return factory;\n }\n \n @Bean\n @ConditionalOnBean(RedisConnectionFactory.class)\n public RedisTemplate redisTemplate(RedisConnectionFactory factory) {\n RedisTemplate template = new RedisTemplate<>();\n template.setConnectionFactory(factory);\n return template;\n }\n}