使用复杂密钥创建Google Guava缓存

问题描述

我正在尝试创建一个以对为键的缓存，并从帖子。

I'm trying to create a Cache that has a "Pair" as its key, with that Pair class taken from this post.

我正在尝试：

CacheLoader<Pair<String, String>, String> loader =
    new CacheLoader<Pair<String, String>, String>() {
       public String load(Pair<String, String> key) {
           return GetRatingIdentityByShortNameLoader(key.first, key.second);
       }
    };

_ratingIdCache = CacheBuilder.newBuilder()
    .concurrencyLevel(a_conclevel.intValue())
    .maximumSize(a_maxsize.intValue())
    .expireAfterAccess(a_maxage.intValue(), TimeUnit.MINUTES)
    .build(loader);

在Eclipse（Helios，Java 1.6）中无法通过以下方式进行编译：

Which fails to compile in Eclipse (helios, java 1.6) with:

有人对如何解决这个问题有任何建议吗？我需要有一个缓存来存储主键为评级代理 +评级的 ID的目标。

Does anybody have any suggestions on how to solve this? The objective that that I need to have a cache that stores an "ID" for which the "primary key" is "Rating Agency" + "Rating".

番石榴10.0 .1

Guava 10.0.1

推荐答案

我最初将此高速缓存定义为Cache，并且当我更改CacheBuilder.build（）以使用复杂的密钥，我忘了更新缓存声明。

I had this cache originally defined as Cache, and when I change the CacheBuilder.build() to use a complex key, I had forgotten to update my cache declaration.

所以从以下简单更改：

Cache<String, String> _ratingAgencyId;

到

Cache<Pair<String, String>, String> _ratingAgencyId;

有帮助。

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