一、@Caching
@Caching 定义了复杂的缓存规则：
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Documented
public @interface Caching {
Cacheable[] cacheable() default {};
CachePut[] put() default {};
CacheEvict[] evict() default {};
}
示例：
@Caching(
cacheable = {
@Cacheable(value={"emp"}, key = "#lastName")
},
put = {
@CachePut(value = {"emp"}, key = "#result.id"),
@CachePut(value = {"emp"}, key = "#result.email")
}
)
public Employee getEmpByLastName(String lastName) {
return employeeMapper.getEmpByLastName(lastName);
}
@Caching 定义了复杂的缓存规则，如果使用@CachePut注解，方法一定会运行。
二、@CacheConfig
这个注解是加在类上，用于抽取缓存的公共配置。
@CacheConfig
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface CacheConfig {
/**
* Names of the default caches to consider for caching operations defined
* in the annotated class.
* <p>If none is set at the operation level, these are used instead of the default.
* <p>May be used to determine the target cache (or caches), matching the
* qualifier value or the bean names of a specific bean definition.
*/
String[] cacheNames() default {}; //指定缓存的名字
/**
* The bean name of the default {@link org.springframework.cache.interceptor.KeyGenerator} to
* use for the class.
* <p>If none is set at the operation level, this one is used instead of the default.
* <p>The key generator is mutually exclusive with the use of a custom key. When such key is
* defined for the operation, the value of this key generator is ignored.
*/
String keyGenerator() default ""; //指定 key 的生成策略
/**
* The bean name of the custom {@link org.springframework.cache.CacheManager} to use to
* create a default {@link org.springframework.cache.interceptor.CacheResolver} if none
* is set already.
* <p>If no resolver and no cache manager are set at the operation level, and no cache
* resolver is set via {@link #cacheResolver}, this one is used instead of the default.
* @see org.springframework.cache.interceptor.SimpleCacheResolver
*/
String cacheManager() default ""; //指定 cacheManager
/**
* The bean name of the custom {@link org.springframework.cache.interceptor.CacheResolver} to use.
* <p>If no resolver and no cache manager are set at the operation level, this one is used
* instead of the default.
*/
String cacheResolver() default "";
}
示例：
@CacheConfig(cacheNames = {"emp"}) //抽取缓存的公共配置
@Service
public class EmployeeService {}
