如何使 Spring 缓存中的缓存名称可配置？

Question

我们使用 Spring 缓存框架进行缓存，并且我们希望能够支持多个缓存命名空间，例如“book”或“isbn”，缓存命名空间是可配置的，而不是在类中进行硬编码，例如具有

@Cacheable({ "book","isbn"})
public Book findBook(ISBN isbn) {...}

我们希望能够以某种方式从属性文件中注入缓存名称，以便可以动态设置缓存名称，例如：

@Cacheable({ #cachename1, #cachename2})
public Book findBook(ISBN isbn) {...}

我在这里使用 SpEL，但不知道这是否可行。

Answer 1

离开smartwjw的回答......

我希望通过 spring 环境变量解析 cacheNames，例如@Cacheable("${my.config.property.name}"). 我通过自定义完成了这个CacheResolver

import java.util.Collection;
import java.util.stream.Collectors;

import org.springframework.cache.CacheManager;
import org.springframework.cache.interceptor.CacheOperationInvocationContext;
import org.springframework.cache.interceptor.SimpleCacheResolver;
import org.springframework.core.env.PropertyResolver;

public class PropertyResolvingCacheResolver
    extends SimpleCacheResolver {

    private final PropertyResolver propertyResolver;

    protected PropertyResolvingCacheResolver(CacheManager cacheManager, PropertyResolver propertyResolver) {
        super(cacheManager);
        this.propertyResolver = propertyResolver;
    }

    @Override
    protected Collection<String> getCacheNames(CacheOperationInvocationContext<?> context) {
        Collection<String> unresolvedCacheNames = super.getCacheNames(context);
        return unresolvedCacheNames.stream()
            .map(unresolvedCacheName -> propertyResolver.resolveRequiredPlaceholders(unresolvedCacheName)).collect(Collectors.toList());
    }
}

当然，您必须将其配置为 THECacheResolver才能与@Configuration扩展名一起使用org.springframework.cache.annotation.CachingConfigurerSupport。

@Configuration
@EnableCaching
public class CacheConfig extends CachingConfigurerSupport {

    public static final String PROPERTY_RESOLVING_CACHE_RESOLVER_BEAN_NAME = "propertyResolvingCacheResolver";

    @Autowired
    private CacheManager cacheManager;
    @Autowired
    private Environment springEnv;

    @Bean(PROPERTY_RESOLVING_CACHE_RESOLVER_BEAN_NAME)
    @Override
    public CacheResolver cacheResolver() {
        return new PropertyResolvingCacheResolver(cacheManager, springEnv);
    }
}

Answer 2

value不可以， @Cacheable 注释的缓存名称 ( ) 属性不支持动态（SpEL 或其他）表达式。您必须实现您自己的版本org.springframework.cache.annotation.SpringCacheAnnotationParser并将其注入到框架中。