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使用Simple-Spring-Memcached的demo示例

要使用Simple-Spring-Memcached首先需要确認使用哪種memcached用戶端，在這裡将使用XMemcached。第一步，将依賴jar導入項目中，推薦使用maven。具體的依賴可以參照SSM源碼的pom.xml配置。具體步驟如下

1、建立一個maven項目，在pom.xml添加上Simple-Spring-Memcached的依賴，還有其它Spring,aop,Xmemcached等如下：

<dependency>
<groupId>com.googlecode.xmemcached</groupId>
<artifactId>xmemcached</artifactId>
<version>1.3.5</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>r09</version>
</dependency>
<dependency>
<groupId>com.google.code.simple-spring-memcached</groupId>
<artifactId>simple-spring-memcached</artifactId>
<version>2.0.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.3</version>
</dependency>

2、在src/main/resources目錄下增加spring的配置檔案，其中一個為xmemcached的配置檔案，一個為spring主配置檔案。如下：

context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
 
http://www.springframework.org/schema/beans
 
 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
 
 
http://www.springframework.org/schema/context
 
 
http://www.springframework.org/schema/context/spring-context-3.0.xsd
 
 
http://www.springframework.org/schema/tx
 
 
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
 
 
http://www.springframework.org/schema/aop
 
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
 
<import resource="simplesm-context.xml" />
 
<aop:aspectj-autoproxy />
<context:annotation-config />
<context:component-scan base-package="com.google.code.ssm,org.colorfuldays.ssm" />
 
<import resource="xmemcached.xml"/>
</beans>

xmemcached.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
 
http://www.springframework.org/schema/beans
 
 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
 
 
http://www.springframework.org/schema/context
 
 
http://www.springframework.org/schema/context/spring-context-3.0.xsd
 
 
http://www.springframework.org/schema/tx
 
 
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
 
 
http://www.springframework.org/schema/aop
 
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
 
<aop:aspectj-autoproxy/>
 
<bean name="defaultMemcachedClient" class="com.google.code.ssm.CacheFactory">
<property name="cacheClientFactory">
<bean class="com.google.code.ssm.providers.xmemcached.MemcacheClientFactoryImpl"/>
</property>
<property name="addressProvider">
<bean class="com.google.code.ssm.config.DefaultAddressProvider">
<property name="address" value="127.0.0.1:11211"/>
</bean>
</property>
<property name="configuration">
<bean class="com.google.code.ssm.providers.CacheConfiguration">
<property name="consistentHashing" value="true"/>
</bean>
</property>
<property name="cacheTranscoders">
<map>
<entry key="org.colorfuldays.ssm.domain.UserDO" value-ref="jsonTranscoder"/>
</map>
</property>
</bean>
 
<bean name="jsonTranscoder" class="com.google.code.ssm.transcoders.JsonTranscoder">
<constructor-arg index="0" value="org.colorfuldays.ssm.domain.UserDO"/>
<constructor-arg index="1">
<ref bean="JsonObjectMapper"/>
</constructor-arg>
<constructor-arg index="2">
<ref bean="longToStringTranscoder"/>
</constructor-arg>
</bean>
 
<bean name="longToStringTranscoder" class="com.google.code.ssm.transcoders.LongToStringTranscoder"/>
<bean name="JsonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper"/>
</beans>

這兩個配置檔案與官方源碼中提供的測試例子差别不大，隻是多出了Transcoder的配置。在配置TransCoder時，要注意JsonTranscoder隻能通過構造函數注入。cacheTranscoders的配置中需要注意其key為Class對象。

完成上述配置後，寫個簡單的例子測試。測試代碼如下：

TestNG測試類

package org.colorfuldays.ssm.dao;
 
import junit.framework.Assert;
import org.codehaus.jackson.map.ObjectMapper;
import org.colorfuldays.ssm.domain.UserDO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.testng.AbstractTestNGSpringContextTests;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;
 
import javax.annotation.Resource;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
 
/**
 * Created by IntelliJ IDEA.
 * User: huxing(huxing1985#gmail.com)
 * Date: 12-5-18
 * Time: 下午6:14
 */
@ContextConfiguration(locations = {"classpath:context.xml"})
public class UserDAOTest extends AbstractTestNGSpringContextTests {
    private static final Logger LOG = LoggerFactory.getLogger(UserDAOTest.class);
    @Resource
    UserDAO userDAO;
    UserDO orignUserDO;
 
    @BeforeTest
    public void before() {
        orignUserDO = new UserDO();
        orignUserDO.setId(1024l);
        orignUserDO.setName("Inzaghi");
        orignUserDO.setPassword("password");
    }
 
    @Test
    public void testGetUserById() throws Exception {
        UserDO userDO = userDAO.getUserById(1124);
        System.out.println(userDO);
        Assert.assertTrue(orignUserDO.equals(userDO));
    }
 
    @Test
    public void testUpdateUserDO() throws Exception {
 
    }
}

DAOImpl類

package org.colorfuldays.ssm.dao.impl;
 
import com.google.code.ssm.api.InvalidateSingleCache;
import com.google.code.ssm.api.ParameterValueKeyProvider;
import com.google.code.ssm.api.ReadThroughSingleCache;
import com.google.code.ssm.api.format.UseJson;
import org.colorfuldays.ssm.dao.UserDAO;
import org.colorfuldays.ssm.domain.UserDO;
import org.springframework.stereotype.Repository;
 
/**
 * Created by IntelliJ IDEA.
 * User: huxing(huxing1985#gmail.com)
 * Date: 12-5-18
 * Time: 下午5:50
 */
@Repository("userDAO")
public class UserDAOImpl implements UserDAO {
    @Override
    @UseJson // 以json格式序列化
    @ReadThroughSingleCache(namespace = "star",expiration = 30)
    public UserDO getUserById(@ParameterValueKeyProvider long id) {
        UserDO userDO = new UserDO();
        userDO.setId(1024l);
        userDO.setName("Inzaghi");
        userDO.setPassword("password");
        return userDO;
    }
 
    @Override
    public int updateUserDO(UserDO userDO) {
        return 0;
    }
 
    @InvalidateSingleCache(namespace = "star")
    public int deleteUser(@ParameterValueKeyProvider long userId) {
        return 0;
    }
 
}
           
package org.colorfuldays.ssm.domain;
 
import java.io.Serializable;
 
/**
 * Created by IntelliJ IDEA.
 * User: huxing([email protected])
 * Date: 12-5-18
 * Time: 下午5:44
 */
public class UserDO implements Serializable{
 
    private static final long serialVersionUID = -9096141633317522945L;
 
    private String name;
    private Long id;
    private String password;
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public Long getId() {
        return id;
    }
 
    public void setId(Long id) {
        this.id = id;
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
 
    @Override
    public String toString() {
        return "UserDO{" +
                "name='" + name + '\'' +
                ", id=" + id +
                ", password='" + password + '\'' +
                '}';
    }
 
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof UserDO)) return false;
 
        UserDO userDO = (UserDO) o;
 
        if (id != null ? !id.equals(userDO.id) : userDO.id != null) return false;
        if (name != null ? !name.equals(userDO.name) : userDO.name != null) return false;
        if (password != null ? !password.equals(userDO.password) : userDO.password != null) return false;
 
        return true;
    }
 
    @Override
    public int hashCode() {
        int result = name != null ? name.hashCode() : 0;
        result = 31 * result + (id != null ? id.hashCode() : 0);
        result = 31 * result + (password != null ? password.hashCode() : 0);
        return result;
    }
}

啟動memcached後即可運作單元測試了。其中使用了@UseJson的注解指定使用json格式對對象做序列化。通過下面的方式可以看到對象存入memcached後結果如下：

[email protected]:simple-spring-memcached-read-only$ telnet 127.0.0.1 11211
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
get star:1124
END
get star:1124
VALUE star:1124 8 50
{"name":"Inzaghi","id":1024,"password":"password"}
END

如果不使用@UseJson注解，則存入Memcached的資料則是Java預設序列化的資料。

測試代碼在這裡： https://github.com/iamxhu/ssm-demo

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