常用的缓存插件 Hibernater二级缓存是一个插件,下面是几种常用的缓存插件: ◆EhCache:可作为进程范围的缓存,存放数据的物理介质可以是内存或硬盘,对Hibernate的查询缓存提供了支持。 ◆OSCache:可作为进程范围的缓存,存放数据的物理介质可以是内存或硬盘,提供了丰富的缓存数据过期策略,对Hibernate的查询缓存提供了支持。 \ ◆SwarmCache:可作为群集范围内的缓存,但不支持Hibernate的查询缓存。 ◆JBossCache:可作为群集范围内的缓存,支持事务型并发访问策略,对Hibernate的查询缓存提供了支持。
官方文档为我们提供了以下解释:
各种缓存提供商对缓存并发策略的支持情况(Cache Concurrency Strategy Support)
Hashtable (not intended for production use) | yes | yes | yes | |
EHCache | yes | yes | yes | |
OSCache | yes | yes | yes | |
SwarmCache | yes | yes | ||
JBoss Cache 1.x | yes | yes | ||
JBoss Cache 2 | yes | yes |
其中最常用的ehcache(3.2默认使用的二级缓存)配置参考ehcache.xml。
hibernate-distribution-3.3.2.GA\project\etc目录下
ehcache.xml
<ehcache> <!-- Sets the path to the directory where cache .data files are created. If the path is a Java System Property it is replaced by its value in the running VM. The following properties are translated: user.home - User's home directory user.dir - User's current working directory java.io.tmpdir - Default temp file path --> <diskStore path="java.io.tmpdir"/> <!--Default Cache configuration. These will applied to caches programmatically created through the CacheManager. The following attributes are required for defaultCache: maxInMemory - Sets the maximum number of objects that will be created in memory eternal - Sets whether elements are eternal. If eternal, timeouts are ignored and the element is never expired. timeToIdleSeconds - Sets the time to idle for an element before it expires. Is only used if the element is not eternal. Idle time is now - last accessed time timeToLiveSeconds - Sets the time to live for an element before it expires. Is only used if the element is not eternal. TTL is now - creation time overflowToDisk - Sets whether elements can overflow to disk when the in-memory cache has reached the maxInMemory limit. --> <defaultCache maxElementsInMemory="10000" eternal="false" timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true" /> <!--Predefined caches. Add your cache configuration settings here. If you do not have a configuration for your cache a WARNING will be issued when the CacheManager starts The following attributes are required for defaultCache: name - Sets the name of the cache. This is used to identify the cache. It must be unique. maxInMemory - Sets the maximum number of objects that will be created in memory eternal - Sets whether elements are eternal. If eternal, timeouts are ignored and the element is never expired. timeToIdleSeconds - Sets the time to idle for an element before it expires. Is only used if the element is not eternal. Idle time is now - last accessed time timeToLiveSeconds - Sets the time to live for an element before it expires. Is only used if the element is not eternal. TTL is now - creation time overflowToDisk - Sets whether elements can overflow to disk when the in-memory cache has reached the maxInMemory limit. --> <!-- Sample cache named sampleCache1 This cache contains a maximum in memory of 10000 elements, and will expire an element if it is idle for more than 5 minutes and lives for more than 10 minutes. If there are more than 10000 elements it will overflow to the disk cache, which in this configuration will go to wherever java.io.tmp is defined on your system. On a standard Linux system this will be /tmp" --> <cache name="sampleCache1" maxElementsInMemory="10000" eternal="false" timeToIdleSeconds="300" timeToLiveSeconds="600" overflowToDisk="true" /> <!-- Sample cache named sampleCache2 This cache contains 1000 elements. Elements will always be held in memory. They are not expired. --> <cache name="sampleCache2" maxElementsInMemory="1000" eternal="true" timeToIdleSeconds="0" timeToLiveSeconds="0" overflowToDisk="false" /> --> <!-- Place configuration for your caches following --> </ehcache>
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