SpringBoot&Caffeine 灵活支持多个缓存配置策略

@Configuration
public class CaffeineConfig extends CachingConfigurerSupport {

    @Override
    @Bean(name = "cacheManager")
    public CacheManager cacheManager() {
        CaffeineCacheManager cacheManager = new CaffeineCacheManager();

        // 方案一(常用)：定制化缓存Cache
        cacheManager.setCaffeine(Caffeine.newBuilder()
                .expireAfterWrite(10, TimeUnit.MINUTES)
                .initialCapacity(100)
                .maximumSize(10_000));

        return cacheManager;
    }

    /**
     * 在@cacheable使用时，指定cacheManager=specCacheManager
     *
     * @return CacheManager
     */
    @Bean(name = "specCacheManager")
    public CacheManager cacheManagerWithSpec() {
        CaffeineCacheManager cacheManager = new CaffeineCacheManager();
        // 不允许空值
        cacheManager.setAllowNullValues(false);
        // 传入一个CaffeineSpec定制缓存，它的好处是可以把配置方便写在配置文件里
        cacheManager.setCaffeineSpec(CaffeineSpec.parse("initialCapacity=20,maximumSize=100,expireAfterWrite=10m"));

        // 指定使用该策略的CacheNames
        cacheManager.setCacheNames(new ArrayList(Arrays.asList("fetchById", "fetchByName")));

        return cacheManager;
    }
}

@Slf4j
@Service
public class UserServiceImpl implements UserService {

    @Override
    @Cacheable(cacheNames = "userSelectOrDefault", cacheManager = "cacheManager", key = "#userId")
    public MyUser selectOrDefault(Integer userId) {

        System.out.println("我要执行【selectOrDefault】方法的查询逻辑啦~ userId=" + userId);
        System.out.println("当前时间：" + LocalDateTime.now().toString());

        return new MyUser()
                .setUserId(userId)
                .setGender(userId % 2)
                .setUserName("userName_" + userId);
    }

    @Override
    @Cacheable(cacheNames = "fetchByName", cacheManager = "specCacheManager", key = "#userName")
    public MyUser fetchByName(String userName) {
        System.out.println("我要执行【fetchByName】方法的查询逻辑啦~userName=" + userName);
        System.out.println("当前时间：" + LocalDateTime.now().toString());

        int hashCode = userName.hashCode();

        return new MyUser()
                .setUserId(hashCode)
                .setGender(hashCode % 2)
                .setUserName(userName);
    }
}