blocks|key|1123024|text|看看RefreshAheadCache，由EHCache提供。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1123025|但是，我找不到任何使用它的例子，也找不到任何指标表明这是成熟的。|1123026|全班同学的评论是：|1123027|实现预读刷新的缓存装饰器。当缓存项到期前被访问并触发背景中值的重新加载时，就会提前读取。|blockquote|1123028|这并不能直接解决问题，如下所述：|1123029|我的问题是如何在不等待读取触发缓存的情况下重新填充缓存|1123030|据我所知，没有标准的方法可以做到这一点。其原因是，过期不是基于计时器的。|1123031|(无耻)提示:由于我认为这是非常有用的，所以我在cache2k中实现了这一点。这个特性称为背景刷新，由CacheBuilder.backgroundRefresh(true)启用。|style|CODE|1123032|entityMap|0|LINK|mutability|MUTABLE|url|http://ehcache.org/apidocs/2.9/net/sf/ehcache/constructs/refreshahead/RefreshAheadCache.html|1|http://cache2k.org/^0|2|H|0|0|0|0|0|0|0|0|1F|10|O|7|1|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|19|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|1A|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|1B|8|@]|9|@]|C|$]]|$1|M|3|N|5|J|7|1C|8|@]|9|@]|C|$]]|$1|O|3|P|5|6|7|1D|8|@]|9|@]|C|$]]|$1|Q|3|R|5|6|7|1E|8|@$A|1F|B|1G|S|T]]|9|@$A|1H|B|1I|1|1J]]|C|$]]|$1|U|3|-4|5|6|7|1K|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]|12|$5|X|Y|Z|C|$10|13]]]]

Take a look at <a href="http://ehcache.org/apidocs/2.9/net/sf/ehcache/constructs/refreshahead/RefreshAheadCache.html" rel="nofollow">RefreshAheadCache</a>, provided by EHCache.

However, I cannot find any examples of its use and indicators that this is mature.

The comment of the class says:

<blockquote>
 A cache decorator which implements read ahead refreshing. Read ahead occurs when a cache entry is accessed prior to its expiration, and triggers a reload of the value in the background.
</blockquote>

This does not directly solve the problem as you mention below:

<blockquote>
 My problem is how to repopulate the cache without waiting for a read to trigger it
</blockquote>

As far as I know there is no standard way to do it. The reason for it, is that the expiry is not timer based.

(Shameless) hint: Since I think this is quite useful, I implemented this in <a href="http://cache2k.org" rel="nofollow">cache2k</a>. The feature is called background refresh, enabled by <code>CacheBuilder.backgroundRefresh(true)</code>.

blocks|key|2274361|text|这段代码可能有助于：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2274362|https://github.com/jsr107/jsr107spec/issues/328|offset|length|2274363|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

may be this code could help : 

<a href="https://github.com/jsr107/jsr107spec/issues/328" rel="nofollow">https://github.com/jsr107/jsr107spec/issues/328</a>

blocks|key|745224|text|Ehcache提供了一种按计划进行刷新的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|745225|您需要两件事才能在Ehcache中工作：|745226|使用缓存加载器+--即移动到缓存读取模式。这是必需的，否则Ehcache不知道如何获取映射到密钥的数据。|unordered-list-item|offset|length|745227|配置计划刷新+--这是通过启动石英调度程序实例来实现的。|745228|entityMap|0|LINK|mutability|MUTABLE|url|https://terracotta.org/generated/4.3.0/html/bmg-all/index.html#page/BigMemory_Go_Documentation_Set%252Fto-caload_cache_loaders.html%2523|1|https://terracotta.org/generated/4.3.0/html/bmm-all/#page/BigMemory_Max_Documentation_Set%252Fco-refresh_scheduled_refresh_ahead.html^0|0|0|2|5|0|0|2|4|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@$G|X|H|Y|1|Z]]|A|$]]|$1|I|3|J|5|F|7|10|8|@]|9|@$G|11|H|12|1|13]]|A|$]]|$1|K|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]|S|$5|N|O|P|A|$Q|T]]]]

Ehcache provides a way of doing what you want with scheduled refresh. 

You will need two things in order to make this work with Ehcache:

<ul>
<li>Use a <a href="https://terracotta.org/generated/4.3.0/html/bmg-all/index.html#page/BigMemory_Go_Documentation_Set%2Fto-caload_cache_loaders.html%23" rel="nofollow">cache loader</a> - that is move to a cache read-through pattern. This is required as otherwise Ehcache has no idea how to get to the data mapped to a key.</li>
<li>Configure <a href="https://terracotta.org/generated/4.3.0/html/bmm-all/#page/BigMemory_Max_Documentation_Set%2Fco-refresh_scheduled_refresh_ahead.html" rel="nofollow">scheduled refresh</a> - this works by launching a quartz scheduler instance.</li>
</ul>

In my scenario, getting the fresh (non-cached) values is a very expensive operation so it is imperative pre-calculated cached values exist at all times instead of refreshing them on read, like EhCache seems to do.

For this it sounds reasonable to have a thread firing on TTL expiration repopulating the cache with fresh values, so no reads are ever waiting.

Is there a way to achieve this using Ehcache? Listening for OnElementExpired/Evicted events to repopulate the cache seems like a no-go (by the time I receive the event, a read would already be waiting).

I guess I could make the cache itself eternal and have my own scheduled task that repopulates, but then I get nothing from EhCache over dumb maps that I have now. Is this really how it is? Is there no way to have EhCache help me in this situation?

Eagerly repopulate EhCache instead of waiting for a read

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在我的场景中，获取新的(非缓存的)值是一项非常昂贵的操作，因此必须始终存在预计算的缓存值，而不是像EhCache所做的那样在读取时刷新它们。因此，让线程在TTL到期时触发，用新值重新填充缓存是合理的，因此永远不会等待读取。是否有一种使用Ehcache实现这一目标的方法？侦听OnElementExpired/逐出事件以重...

问急切地重新填充EhCache，而不是等待读取
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问急切地重新填充EhCache，而不是等待读取EN