一、项目说明
1.1 XMemcached
XMemcached 是基于 Java NIO 实现的 Memcached 的高性能客户端,支持完整的 Memcached 协议,支持客户端分布并且提供了一致性哈希 (consistent hash) 算法的实现。
1.2 项目结构
- Memcached 的整合配置位于 resources 下的 Memcached 文件夹下,其中集群配置以 cluster 开头。所有配置按需在
springApplication.xml
中用 import 标签导入。 - 实体类 Programmer 用于测试 Memcached 的序列化与反序列化。
springapplication.xml 文件:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!--memcached 单机版配置-->
<!--<import resource="classpath*:memcached/singleConfig.xml"/>-->
<!--memcached 集群配置-->
<import resource="classpath*:memcached/clusterConfig.xml"/>
</beans>
1.3 相关依赖
除了 Spring 的基本依赖外,需要导入 xmemcached 依赖包:
<!--memcached java 客户端-->
<dependency>
<groupId>com.googlecode.xmemcached</groupId>
<artifactId>xmemcached</artifactId>
<version>2.4.5</version>
</dependency>
二、整合 XMemcached
2.1 单机配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="memcachedClientBuilder" class="net.rubyeye.xmemcached.XMemcachedClientBuilder">
<constructor-arg name="addressList" value="192.168.200.201:11211"/>
</bean>
<bean id="memcachedClient" factory-bean="memcachedClientBuilder" factory-method="build"
destroy-method="shutdown"/>
</beans>
2.2 集群配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean name="memcachedClientBuilder" class="net.rubyeye.xmemcached.XMemcachedClientBuilder">
<!--memcached servers 节点列表-->
<constructor-arg name="addressList">
<list>
<bean class="java.net.InetSocketAddress">
<constructor-arg value="192.168.200.201"/>
<constructor-arg value="11211"/>
</bean>
<bean class="java.net.InetSocketAddress">
<constructor-arg value="192.168.200.201"/>
<constructor-arg value="11212"/>
</bean>
</list>
</constructor-arg>
<!--与 servers 对应的节点的权重-->
<constructor-arg name="weights">
<list>
<value>1</value>
<value>2</value>
</list>
</constructor-arg>
<!--连接池大小-->
<property name="connectionPoolSize" value="10"/>
<!--协议工厂-->
<property name="commandFactory">
<bean class="net.rubyeye.xmemcached.command.TextCommandFactory"/>
</property>
<!--分布策略,一致性哈希 net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator 或者 ArraySessionLocator(默认)-->
<property name="sessionLocator">
<bean class="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator"/>
</property>
<!--序列化转换器,默认使用 net.rubyeye.xmemcached.transcoders.SerializingTranscoder-->
<property name="transcoder">
<bean class="net.rubyeye.xmemcached.transcoders.SerializingTranscoder"/>
</property>
</bean>
<!-- 集群配置 实例化 bean -->
<bean name="memcachedClientForCulster" factory-bean="memcachedClientBuilder"
factory-method="build" destroy-method="shutdown"/>
</beans>
2.3 存储基本类型测试用例
XMemcached 单机版和集群版注入的实例是完全相同的:
@RunWith(SpringRunner.class)
@ContextConfiguration({"classpath:springApplication.xml"})
public class MemSamples {
@Autowired
private MemcachedClient memcachedClient;
@Test
public void operate() throws InterruptedException, MemcachedException, TimeoutException {
memcachedClient.set("hello", 0, "Hello,cluster xmemcached");
String value = memcachedClient.get("hello");
System.out.println("hello=" + value);
memcachedClient.delete("hello");
value = memcachedClient.get("hello");
System.out.println("hello=" + value);
}
}
2.4 存储实体对象测试用例
@RunWith(SpringRunner.class)
@ContextConfiguration({"classpath:springApplication.xml"})
public class MemObjectSamples {
@Autowired
private MemcachedClient memcachedClient;
@Test
public void operate() throws InterruptedException, MemcachedException, TimeoutException {
memcachedClient.set("programmer", 0, new Programmer("xiaoming", 12, 5000.21f, new Date()));
Programmer programmer = memcachedClient.get("programmer");
System.out.println("hello ," + programmer.getName());
memcachedClient.delete("programmer");
programmer = memcachedClient.get("programmer");
Assert.assertNull(programmer);
}
}
附:Memcached 基本命令
命令 | 格式 | 说明 |
---|---|---|
新增 set | set key flags exTime length -> value | 无论什么情况,都可以插入 |
新增 add | add key flags exTime length -> value | 只有当 key 不存在的情况下,才可以插入 |
替换 replace | replace key flags exTime length -> value | 只修改已存在 key 的 value 值 |
追加内容 append | append key flags exTime length -> value | length 表示追加的长度而不是总长度 |
前面追加 prepend | prepend key flags exTime length -> value | length 表示追加的长度而不是总长度 |
查询操作 get | get key | |
检查更新 cas | cas key flags exTime length version -> value | 版本正确才更新 |
详细获取 gets | gets key | 返回的最后一个数代表 key 的 CAS 令牌 |
删除 delete | delete key | 将数据打一个删除标记 |
自增 incr | incr key 增加偏移量 | incr 和 decr 只能操作能转换为数字的 Value |
自减 decr | decr key 减少偏移量 | desr 不能将数字减少至 0 以下 |
清库 | flush_all |