如何使用Spring Ehcache抽象动态创建缓存

Question

在Google Code上可用的ehcache-spring-annotations库中，有一个“create-missing-caches”的配置选项可用于在运行时创建动态缓存（缓存未在ehcache.xml中定义）。在纯Spring ehcache抽象（Spring 3.1.1）中是否有类似的配置可用？或者是否有其他方法可以使用Spring ehcache抽象来创建动态缓存？

- Sudhir

Answer 1

我通过扩展org.springframework.cache.ehcache.EhCacheCacheManager并覆盖getCache(String name)方法来实现了它。以下是代码片段：

public class CustomEhCacheCacheManager extends EhCacheCacheManager {

private static final Logger logger = LoggerFactory
        .getLogger(CustomEhCacheCacheManager.class);

private static final String NO_CACHE_ERROR_MSG = "loadCaches must not return an empty Collection";

@Override
public void afterPropertiesSet() {
    try {
        super.afterPropertiesSet();
    } catch (IllegalArgumentException e) {
        if (NO_CACHE_ERROR_MSG.equals(e.getMessage())) {
            logger.debug("No cache was defined in ehcache.xml. The error "
                    + "thrown by spring because of this was suppressed.");
        } else {
            throw e;
        }
    }
}

@Override
public Cache getCache(String name) {
    Cache cache = super.getCache(name);
    if (cache == null) {
        logger.debug("No cache with name '"
                + name
                + "' is defined in encache.xml. Hence creating the cache dynamically...");
        getCacheManager().addCache(name);
        cache = new EhCacheCache(getCacheManager().getCache(name));
        addCache(cache);
        logger.debug("Cache with name '" + name
                + "' is created dynamically...");
    }
    return cache;
}

}

如果有其他更好的方法，请告诉我。

- Sudhir

---

如果您不关心日志记录，getCache()方法可以更简单地编写为： getCacheManager().addCacheIfAbsent(name); return super.getCache(name); - engfer

getCacheManager().cacheExists(name) 返回 true，即使该缓存名称不存在。 - user1569858