grails 1.3.9 应用程序中的 EHCache 默认值 [英] EHCache default values in a grails 1.3.9 application

问题描述

在 grails 1.3.9 应用程序中 ehcache 的默认值是什么?特别是我对查询缓存值感兴趣；我通过 postgres 的 psql 删除了几行，但我没有看到我的应用程序中反映的更改.我还没有将 ehcache.xml 文件添加到 conf 目录中.我什至重新启动了 grails 应用程序，数据仍然显示在报告中.没有我可以删除的缓存文件作为解决方法吗?

What are ehcache's default values in a grails 1.3.9 application ? In particular I'm interested in the query cache value; I deleted a couple of rows via postgres' psql and I don't see the changes reflected in my app. I haven't added the ehcache.xml file to the conf directory. I even restarted the grails app and the data still shows up in the report. Aren't there any cache files I can delete as a workaround?

更新:我添加了以下ehcache.xml配置文件:

update: I added the following ehcache.xml configuration file:

<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="ehcache.xsd" >
<diskStore path="/tmp/ehcache_t2"/>
<cacheManagerEventListenerFactory class="" properties=""/>
<defaultCache
   maxElementsInMemory="10000"
   eternal="false"
   timeToLiveSeconds="120">

</defaultCache>
<cache name="org.hibernate.cache.UpdateTimestampsCache"
  maxElementsInMemory="10000"
  timeToIdleSeconds="300"
   />
<cache name="org.hibernate.cache.StandardQueryCache"
  maxElementsInMemory="10000"
  timeToIdleSeconds="30"
   />
</ehcache>

但是 StandardQueryCache 的 timeToIdleSeconds="30" 也不起作用.

But StandardQueryCache's timeToIdleSeconds="30" is not working either.

推荐答案

Grails 将在 conf 目录中查找 ehcache.xml.如果没有找到，它会使用你的类路径中的那个，看看 ehcache-core.jar.您将看到一个名为 ehcache-failsafe.xml 的文件，您可以在其中找到:

Grails will look for a ehcache.xml in the conf directory. If not found, it will use the one in your classpath, take a look at the ehcache-core.jar. You'll see a file named ehcache-failsafe.xml where you'll find:

<defaultCache
            maxElementsInMemory="10000"
            eternal="false"
            timeToIdleSeconds="120"
            timeToLiveSeconds="120"
            overflowToDisk="true"
            maxElementsOnDisk="10000000"
            diskPersistent="false"
            diskExpiryThreadIntervalSeconds="120"
            memoryStoreEvictionPolicy="LRU"
            /> 

要使用查询缓存，您必须在 Datasource.groovy 中进行配置:

To make use of the query cache, you must have configured in your Datasource.groovy:

hibernate {
    cache.use_second_level_cache=true
    cache.use_query_cache=true
    cache.provider_class='org.hibernate.cache.EhCacheProvider'
}

虽然，就像@GreyBeardedGeek 指出的那样，EhCache 是一种直写式缓存.它只会缓存通过休眠及其二级缓存操作的对象.如果您在数据库中编写 sql 查询，它不会在您的缓存中缓存对象.

Although, like @GreyBeardedGeek pointed out, EhCache is a write-through cache. It will only cache objects that are manipulated via hibernate and its second level cache. If you write a sql query in your database, it will not cache objects in your cache.

要更深入地了解它，请查看此处和这里.

To understand more deeply about it, take a look here and here.

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