[转]hibernate-memcached补丁：支持Whalin的MemCached Java客户端

2024年2月8日 132次阅读 来源: memcached

hibernate-memcached补丁：支持Whalin的MemCached Java客户端

hibernate-memcached（http://code.google.com/p/hibernate-memcached/ ）是允许hibernate使用MemCached作为二级缓存的项目，它用到了spymemcached（http://code.google.com/p/spymemcached/ ）这个MemCached的Java客户端。花了一点时间做了个补丁，让它也支持Whalin的Java客户端（http://whalin.com/memcached/ ）。

所有的代码（包括原hibernate-memcached的所有源码）、javadoc及重新制作的发布包请见附件，限于篇幅就不具体说明了。以下是我更新过的hibernate-memcached的配置说明，原配置说明请参见http://code.google.com/p/hibernate-memcached/wiki/Configuration

 

Adding hibernate-memcached to your application

If you are using Maven2 for your application build you can follow the instructions on the MavenRepository page. For those that aren’t using Maven2 you’ll need to collect a few simple jars for yourself. I am going to assume you already have hibenrnate3 setup before you came here.

You’ll need…

If you are using spymemcached as the MemCached client, you also need

or if you prefer Whalin’s memcached client for java , you need to download java_memcached-release_2.0.1.jar from the download page according to your Java VM version.

Configuring Hibernate

The first thing to do is to tell hibernate which cache provider you’d like to use, and to enable the second level cache.

hibernate.cache.provider_classcom.googlecode.hibernate.memcached.MemcachedCacheProvider

Using just the property above you get basic entity caching by default. The hibernate-memcached library supports query caching, but you have to enable query caching separately.

hibernate.cache.use_query_cachetrue

!Now you can start setting up the hibernate-memcached specific properties. The hibernate-memcached properties are divided into two categories; cache-wide settings and cache-region settings.

Cache Wide Settings

The cache wide settings all have defaults can mostly be overwritten at a cache-region level. For both spymemcached and Whalin’s client, you can set:

PropertyDefaultDescription
hibernate.memcached.serverslocalhost:11211Space delimited list of memcached instances in host:port format
hibernate.memcached.cacheTimeSeconds300The default number of seconds items should be cached. Can be overriden at the regon level.
hibernate.memcached.keyStrategyHashCodeKeyStrategySets the strategy class to to use for generating cache keys. Must provide a class name that implements KeyStrategy
hibernate.memcached.clearSupportedfalseEnables support for the MemcachedCache.clear() method for all cache regions. The way clear is implemented for memcached is expensive and adds overhead to all get/set operations. It is not recommended for production use.

For spymemcached, you can set:

hibernate.memcached.readBufferSizeDefaultConnectionFactory.DEFAULT_READ_BUFFER_SIZEThe read buffer size for each server connection from this factory
hibernate.memcached.operationQueueLengthDefaultConnectionFactory.DEFAULT_OP_QUEUE_LENMaximum length of the operation queue returned by this connection factory
hibernate.memcached.operationTimeoutDefaultConnectionFactory.DEFAULT_OPERATION_TIMEOUTDefault operation timeout in milliseconds
hibernate.memcached.hashAlgorithmHashAlgorithm.KETAMA_HASHWhich hash algorithm to use when adding items to the cache. Note: the MemcachedClient defaults to using HashAlgorithm.NATIVE_HASH, while the hibernate-memcached cache defaults to KETAMA_HASH for “consistent hashing”

For Whalin’s client, you can set:

hibernate.memcached.weights Space delimited list of server weights. If not set, all servers get the same weight
hibernate.memcached.errorHandler com.googlecode.hibernate.memcached.
dangamemcached.SimpleErrorHandler 		Error handler used by Whalin’s client internally
hibernate.memcached.poolName default The name of SockIOPool
hibernate.memcached.initConn 1 Initial pool size
hibernate.memcached.minConn 1 Min pool size
hibernate.memcached.maxConn 10 Max pool size
hibernate.memcached.maxIdle 3000000 Max idle time for available sockets. Default 5 minutes
hibernate.memcached.socketTimeout 30000 Default timeout of socket reads. Default 30 seconds
hibernate.memcached.socketConnectTimeout 3000 Default timeout of socket connections. Default 3 seconds
hibernate.memcached.maintSleep 30000 Maintenance thread sleep time. Default 30 seconds
hibernate.memcached.compressEnable true If compression enabled
hibernate.memcached.defaultEncoding UTF-8 Default encoding

Cache Region Settings

Cache regon properties are set by giving your cached data a “region name” in hibernate. You can tune the MemcachedCache instance for your region using the following properties. These properties essentially override the cache-wide properties above.

PropertyDefaultDescription
hibernate.memcached.[region-name].cacheTimeSecondsnone, see hibernate.memcached.cacheTimeSecondsSet the cache time for this cache region, overriding the cache-wide setting.
hibernate.memcached.[region-name].keyStrategynone, see hibernate.memcached.keyStrategyOverrides the strategy class to to use for generating cache keys in this cache region. Must provide a class name that implements KeyStrategy
hibernate.memcached.[region-name].clearSupportednone, see hibernate.memcached.clearSupportedEnables clear() operations for this cache region only. Again, the clear operation incurs cost on every get/set operation.

Hibernate-MemCached-1.0.zip (139.3 KB)

 

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1 楼
movingboy 2008-10-09  
引用 还是要说明一下：

附件里的代码中，包com.googlecode.hibernate.memcached.dangamemcached中的代码是我加的，其它的是原项目中的代码。我已经发邮件给Ray Krueger，把我的代码捐赠给了这个项目，因为Ray还收到了另一份捐赠的Whalin补丁，现在还不知道他到底会采用谁的代码。不管怎样，希望这个项目越来越好

上面的配置中忘了提到一点：使用Whalin的客户端时，还必须把hibernate.memcached.memcacheClientFactory设为com.googlecode.hibernate.memcached.whalin.DangaMemcacheClientFactory

 

    原文作者：memcached
    原文地址: https://www.cnblogs.com/suyang/archive/2010/02/12/1667682.html
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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