在当前的一个语音系统中，需要频繁进行I/O操作， 为了应付未来可能出现的高并发访问， 初步计划引入缓存机制。
在诸多缓存中， ehcache口碑不错， 我之前也写过一篇文章介绍ehcache的使用：
http://lcllcl987.javaeye.com/blog/222693
在诸多缓存中， ehcache口碑不错， 我之前也写过一篇文章介绍ehcache的使用：
http://lcllcl987.javaeye.com/blog/222693
但ehcache不是一个分布式缓存解决方案。
所以， 就初选memcached了:
http://www.danga.com/memcached/
memcached的安装交给google，略过不表。
下面是两个memcached client的java实现：
http://www.whalin.com/memcached/
http://code.google.com/p/spymemcached/
以
http://www.whalin.com/memcached/
为例， 它的文档不错， 就不多说了。 test如下：
- package co.cache;
- import com.danga.MemCached.MemCachedClient;
- import com.danga.MemCached.SockIOPool;
- public class MyMemCachedClient
- {
- // create a static client as most installs only need
- // a single instance
- private static MemCachedClient memCachedClient = new MemCachedClient();
- // set up connection pool once at class load
- static
- {
- // server list and weights
- String[] servers = {"192.168.0.55:11211"};
- Integer[] weights = {3};
- // grab an instance of our connection pool
- SockIOPool pool = SockIOPool.getInstance();
- // set the servers and the weights
- pool.setServers(servers);
- pool.setWeights(weights);
- // set some basic pool settings
- // 5 initial, 5 min, and 250 max conns
- // and set the max idle time for a conn
- // to 6 hours
- pool.setInitConn(5);
- pool.setMinConn(5);
- pool.setMaxConn(250);
- pool.setMaxIdle(1000 * 60 * 60 * 6);
- // set the sleep for the maint thread
- // it will wake up every x seconds and
- // maintain the pool size
- pool.setMaintSleep(30);
- // set some TCP settings
- // disable nagle
- // set the read timeout to 3 secs
- // and don't set a connect timeout
- pool.setNagle(false);
- pool.setSocketTO(3000);
- pool.setSocketConnectTO(0);
- // initialize the connection pool
- pool.initialize();
- // lets set some compression on for the client
- // compress anything larger than 64k
- memCachedClient.setCompressEnable(true);
- memCachedClient.setCompressThreshold(64 * 1024);
- }
- public static MemCachedClient getMemCachedClient()
- {
- return memCachedClient;
- }
- // from here on down, you can call any of the client calls
- public static void examples()
- {
- memCachedClient.set("foo", "This is a test String");
- String bar = (String) memCachedClient.get("foo");
- }
- public static void main(String[] args)
- {
- MyMemCachedClient.getMemCachedClient().set("foo", "This is a test String.");
- String bar = (String)MyMemCachedClient.getMemCachedClient().get("foo");
- System.out.println(bar);
- }
- }
- 和ehcache不同的是，memcached似乎只采用LRU算法， 还对付cache满员的情况。