Memcache初学之三 java客户端三种方式操作
Memcached 客户端程序Memcached的java客户端已经存在三种了：
一、官方提供的基于传统阻塞io由Greg Whalin维护的客户端 memcached client for java
二、Dustin Sallings实现的基于java nio的Spymemcached spymemcached
三、XMemcached xmemcached
三种API比较
1 ) memcached client for java
较早推出的memcached JAVA客户端API，应用广泛，运行比较稳定。
2) spymemcached
A simple, asynchronous, single-threaded memcached client written in java. 支持异步，单线程的 memcached客户端，用到了java1.5版本的concurrent和nio，存取速度会高于前者，但是稳定性不好，测试中常 报timeOut等相关异常。
3) xmemcached
XMemcached同样是基于java nio的客户端，java nio相比于传统阻塞io模型来说，有效率高（特别在高并发下）和资源耗费相对较少的优点。传统阻塞IO为了提高效率，需要创建一定数量的连接形成连接 池，而nio仅需要一个连接即可（当然,nio也是可以做池化处理），相对来说减少了线程创建和切换的开销，这一点在高并发下特别明显。因此 XMemcached与Spymemcached在性能都非常优秀，在某些方面（存储的数据比较小的情况下）Xmemcached比 Spymemcached的表现更为优秀，具体可以看这个Java Memcached Clients Benchmark。
Memcached java client
Memcached java client是官方推荐的最早的memcached java客户端。最新版本：java_memcached-release_2.6.1。
官方下载地址：https://github.com/gwhalin/Memcached-Java-Client
采用阻塞式SOCKET通讯，据说目前版本进行了很多优化，性能有所提高（只看过1.5的源代码，还没来及看最新的）
提供key方式的连接池，默认连接池key为default。（老版本了）。2.6.1版本支持apache-commoms-pool作为连接池。
支持权重配置。
后期的版本提增加了cas支持和getMutl功能
官方示例代码
Java代码
[*]import com.danga.MemCached.MemCachedClient;
[*]import com.danga.MemCached.SockIOPool;
[*]import com.schooner.MemCached.MemcachedItem;
[*]
[*]public class MemcachedForJavaExample {
[*]
[*] // create a static client as most installs only need
[*] // a single instance
[*] protected static MemCachedClient mcc = new MemCachedClient();
[*]
[*] // set up connection pool once at class load
[*] static {
[*]
[*] // server list and weights
[*] String[] servers = { "localhost:11211", "localhost:11212", "localhost:11213" };
[*]
[*] Integer[] weights = { 3, 3, 2 };
[*]
[*] // grab an instance of our connection pool
[*] SockIOPool pool = SockIOPool.getInstance();
[*]
[*] // set the servers and the weights
[*] pool.setServers(servers);
[*] pool.setWeights(weights);
[*] pool.setHashingAlg(SockIOPool.CONSISTENT_HASH);
[*]
[*] // 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();
[*] }
[*]
[*] public static void main(String[] args) {
[*] System.out.println("SET: " + mcc.set("key1", "value1"));
[*] System.out.println("SET: " + mcc.set("key2", "value2"));
[*] System.out.println("SET: " + mcc.set("key3", "value3"));
[*] System.out.println("GET: " + mcc.get("key1"));
[*] MemcachedItem item = mcc.gets("key1");
[*] System.out.println("GETS: value=" + item.getValue() + ",CasUnique:"+item.getCasUnique());
[*] System.out.println("SET: " + mcc.set("key1", "value1_1"));
[*] System.out.println("CAS: " + mcc.cas("key1", "value1_2", item.getCasUnique())); //必须FALSE
[*] System.out.println("getMulti:" + mcc.getMulti(new String[]{"key1","key2","key3"}));
[*] }
[*]
[*]}
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