Xmemcached 的简单使用

1. 前一篇文章简单说了下如何安装memcached，想到了memcached是分布式的缓存框架，所以自己在公司的3台测试机上安装了下。

2. 关于什么是xmemcached就不多说了，其实就是实现了memcached的java客户端，关于分布式下一篇会稍微详细点介绍，这里只要知道这个分布式其实是客户端的分布式，其实是没有主从节点的概念的。

3. 直接贴代码，看看如何使用

import java.io.IOException;
import java.util.concurrent.TimeoutException;

import net.rubyeye.xmemcached.CASOperation;
import net.rubyeye.xmemcached.MemcachedClient;
import net.rubyeye.xmemcached.MemcachedClientBuilder;
import net.rubyeye.xmemcached.XMemcachedClientBuilder;
import net.rubyeye.xmemcached.exception.MemcachedException;
import net.rubyeye.xmemcached.utils.AddrUtil;

public class Cache {

    private MemcachedClientBuilder builder = null;
    private MemcachedClient client = null;

    public Cache(String address, int[] weight) {
        builder = new XMemcachedClientBuilder(AddrUtil.getAddresses(address), weight);
        builder.setConnectionPoolSize(5);
        try {
            client = builder.build();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void set(String key, int exp, Object value) {
        try {
            if (!client.set(key, exp, value)) {
                System.err.println("set error, key is " + key + " value is " + value);
            }
        } catch (TimeoutException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (MemcachedException e) {
            e.printStackTrace();
        }
    }

    public void delete(String key) {
        try {
            client.delete(key);
        } catch (TimeoutException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (MemcachedException e) {
            e.printStackTrace();
        }
    }

    public void update(String key, final Object value) {
        try {
            client.cas(key, 10, new CASOperation<Object>() {
                public int getMaxTries() {
                    return 1;
                }

                public Object getNewValue(long currentCAS, Object currentValue) {
                    return value;
                }
            });
        } catch (TimeoutException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (MemcachedException e) {
            e.printStackTrace();
        }
    }

    public Object get(String key) {
        try {
            return client.get(key);
        } catch (TimeoutException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (MemcachedException e) {
            e.printStackTrace();
        }
        return null;
    }

    public void addServer(String server, int port, int weight) {
        try {
            client.addServer(server, port, weight);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void removeServer(String hostList) {
        client.removeServer(hostList);
    }
}

这个类做了一个特别简单的封装，包括了增删改查还有动态添加删除节点，其实就是简单得使用了下api，其实api很多，大家可以自己查api

下面是一个测试类

public static void main(String[] args) {
//      testCRUD();
        testSerObject();
    }

    public static void testCRUD() {
        String address = "xx01:11211 xx02:11211 xx03:11211";
        Cache cache = new Cache(address, new int[] { 1, 1, 1 });
        cache.set("hello", 10, "test");
        System.out.println(cache.get("hello"));
        cache.update("hello", "ssss");
        System.out.println(cache.get("hello"));
        cache.delete("hello");
        System.out.println(cache.get("hello"));
    }

    public static void testSerObject() {
        String address = "arreat00:11211 arreat01:11211 arreat02:11211";
        Cache cache = new Cache(address, new int[] { 1, 1, 1 });
        User user = new User();
        user.setId(1);
        user.setMobile("13564316073");
        user.setEmail("[email protected]");
        user.setPasswd("ttt");
        user.setUserName("qianjc");
        List<String> asseat = new ArrayList<String>();
        asseat.add("asseat0");
        asseat.add("asseat1");

        Map<String, String> car = new HashMap<String, String>();
        car.put("car1", "val1");
        car.put("car2", "val2");

        user.setAsseat(asseat);
        user.setCar(car);

        user.setBook(buildBook(1, "memcached进阶", "smart出版"));
        user.setBooks(buildBooks());

//      cache.set("user1", 0, user);
        System.out.println(cache.get("user1"));
    }


    public static Book buildBook(int id, String name, String pulish) {
        Book book = new Book();
        book.setId(id);
        book.setName(name);
        book.setPulish(pulish);
        return book;
    }

    public static List<Book> buildBooks() {
        List<Book> books = new ArrayList<Book>();

        for (int i = 0; i < 2; ++i) {
            books.add(buildBook(i, "memcached进阶" + i, "smart出版" + i));
        }
        return books;
    }
}

可以看到memcached不仅仅支持简单String,int等类型，只要实现了Serializable接口的java序列化对象都可以

具体怎么使用可以查api，还是比较简单的！！
也可以参考一篇博客：http://blog.csdn.net/ljhabc1982/article/details/6338898