memcached demo 应用例子Memcached是一个高性能的分布式内存对象缓存系统，用于动态Web应用以减轻数据库负
memcached demo 应用例子
Memcached 是一个高性能的分布式内存对象缓存系统，用于动态Web应用以减轻数据库负载。它通过在内存中缓存数据和对象来减少读取数据库的次数，从而提供动态、数据 库驱动网站的速度。Memcached基于一个存储键/值对的hashmap。其守护进程（daemon ）是用C写的，但是客户端可以用任何语言来编写，并通过memcached协议与守护进程通信。但是它并不提供冗余（例如，复制其hashmap条目）； 当某个服务器S停止运行或崩溃了，所有存放在S上的键/值对都将丢失。
Memcached由Danga Interactive开发，用于提升LiveJournal.com访问速度的。LJ每秒动态页面访问量几千次，用户700万。Memcached将数 据库负载大幅度降低，更好的分配资源，更快速访问。?
??1?package?com.ctoall.core;??2?
??3?import?java.util.Date;
??4?
??5?import?com.danga.MemCached.MemCachedClient;
??6?import?com.danga.MemCached.SockIOPool;
??7?
??8?
??9?public?class?MemCached?{
?10??????//?创建全局的唯一实例
?11?????protected?static?MemCachedClient?mcc?=?new?MemCachedClient();
?12?????
?13?????protected?static?MemCached?memCached?=?new?MemCached();
?14?????//?设置与缓存服务器的连接池
?15?????static?{
?16?????????//?服务器列表和其权重
?17?????????String[]?servers?=?{"192.168.186.128:11211"};
?18?????????Integer[]?weights?=?{3};
?19?
?20?????????//?获取socke连接池的实例对象
?21?????????SockIOPool?pool?=?SockIOPool.getInstance();
?22?
?23?????????//?设置服务器信息
?24?????????pool.setServers(?servers?);
?25?????????pool.setWeights(?weights?);
?26?
?27?????????//?设置初始连接数、最小和最大连接数以及最大处理时间
?28?????????pool.setInitConn(?5?);
?29?????????pool.setMinConn(?5?);
?30?????????pool.setMaxConn(?250?);
?31?????????pool.setMaxIdle(?1000?*?60?*?60?*?6?);
?32?
?33?????????//?设置主线程的睡眠时间
?34?????????pool.setMaintSleep(?30?);
?35?
?36?????????//?设置TCP的参数，连接超时等
?37?????????pool.setNagle(?false?);
?38?????????pool.setSocketTO(?3000?);
?39?????????pool.setSocketConnectTO(?0?);
?40?
?41?????????//?初始化连接池
?42?????????pool.initialize();
?43?
?44?????????//?压缩设置，超过指定大小（单位为K）的数据都会被压缩
?45?????????mcc.setCompressEnable(?true?);
?46?????????mcc.setCompressThreshold(?64?*?1024?);
?47?????}
?48?????/**
?49??????*?保护型构造方法，不允许实例化！
?50??????*
?51??????*/
?52?????protected?MemCached()
?53?????{
?54?????????
?55?????}
?56?????
?57?????/**
?58??????*?获取唯一实例.
?59??????*?@return
?60??????*/
?61?????public?static?MemCached?getInstance()
?62?????{
?63?????????return?memCached;
?64?????}
?65?????
?66?????/**
?67??????*?添加一个指定的值到缓存中.
?68??????*?@param?key
?69??????*?@param?value
?70??????*?@return
?71??????*/
?72?????public?boolean?add(String?key,?Object?value)
?73?????{
?74?????????return?mcc.add(key,?value);
?75?????}
?76?????
?77?????public?boolean?add(String?key,?Object?value,?Date?expiry)
?78?????{
?79?????????return?mcc.add(key,?value,?expiry);
?80?????}
?81?????
?82?????public?boolean?replace(String?key,?Object?value)
?83?????{
?84?????????return?mcc.replace(key,?value);
?85?????}
?86?????
?87?????public?boolean?replace(String?key,?Object?value,?Date?expiry)
?88?????{
?89?????????return?mcc.replace(key,?value,?expiry);
?90?????}
?91?????
?92?????/**
?93??????*?根据指定的关键字获取对象.
?94??????*?@param?key
?95??????*?@return
?96??????*/
?97?????public?Object?get(String?key)
?98?????{
?99?????????return?mcc.get(key);
100?????}
101?????
102?????public?static?void?main(String[]?args)
103?????{
104?????????MemCached?cache?=?MemCached.getInstance();
105????????StudentDO?stuDO=new?StudentDO();
106????????stuDO.setId(10);
107????????stuDO.setAge(28);
108????????stuDO.setName("sunney");
109????????stuDO.setAddress("广东省深圳市福田区梅华路105号多丽科技楼9楼");?
110????????cache.add("stu",?stuDO);
111????????StudentDO?stuDO1=(StudentDO)cache.get("stu");
112????????System.out.println("id:"+stuDO1.getId());
113????????System.out.println("name:"+stuDO1.getName());
114????????System.out.println("age:"+stuDO1.getAge());
115????????System.out.println("adress:"+stuDO1.getAddress());
116????????System.out.println("+++++++++++++++++++++++ok++++++++++++++++++++++++");
117?????????????
118?????}
119?}
