2237511

一、依賴

1. ehcache依賴

<ehcache.version>2.6.11</ehcache.version>
<dependency>
    <groupId>net.sf.ehcache</groupId>
    <artifactId>ehcache-core</artifactId>
    <version>${ehcache.version}</version>
</dependency>

2. ehcache依賴樹: mvn dependency:tree

[INFO] \- net.sf.ehcache:ehcache-core:jar:2.6.11:compile
[INFO] \- org.slf4j:slf4j-api:jar:1.7.5:compile

3. 由于slf4j-api是日志接口，加入具體實作logback(log4j也可以)

<logback.version>1.0.13</logback.version>
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-core</artifactId>
    <version>${logback.version}</version>
</dependency>
<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>${logback.version}</version>
</dependency>

4. 為了友善單元測試，引入junit

<junit.version>4.11</junit.version>
<dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>${junit.version}</version>
</dependency>

最終pom:

<properties>
       <ehcache.version>2.6.11</ehcache.version>
       <logback.version>1.0.13</logback.version>
       <junit.version>4.11</junit.version>
   </properties>
   <dependencies>
       <dependency>
           <groupId>ch.qos.logback</groupId>
           <artifactId>logback-core</artifactId>
           <version>${logback.version}</version>
       </dependency>
       <dependency>
           <groupId>ch.qos.logback</groupId>
           <artifactId>logback-classic</artifactId>
           <version>${logback.version}</version>
       </dependency>
       <dependency>
           <groupId>junit</groupId>
           <artifactId>junit</artifactId>
           <version>${junit.version}</version>
       </dependency>
       <dependency>
           <groupId>net.sf.ehcache</groupId>
           <artifactId>ehcache-core</artifactId>
           <version>${ehcache.version}</version>
       </dependency>
   </dependencies>
   <build>
       <plugins>
           <plugin>
               <groupId>org.apache.maven.plugins</groupId>
               <artifactId>maven-compiler-plugin</artifactId>
               <version>3.1</version>
               <configuration>
                   <source>1.7</source>
                   <target>1.7</target>
                   <encoding>UTF-8</encoding>
               </configuration>
           </plugin>
       </plugins>
   </build>

二、ehcache配置

注意：如果不添加，會使用ehcache-core-2.6.11.jar下的ehcache-failsafe.xml作為預設配置

一般來說需要把ehcache.xml放到classpath下：我們使用極簡配置

<?xml version="1.0" encoding="UTF-8" ?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd">
    <cache name="firstEhcache" maxElementsInMemory="10000">
    </cache>
</ehcache>

三、logback配置

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="5 seconds">
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>
    <root level="INFO">
        <appender-ref ref="STDOUT"/>
    </root>
</configuration>

四、單元測試

1. 一個實體類：

package com.sohu.tv.ehcache.first;
import java.util.Date;
/**
 * 俱樂部
 * 
 * @author leifu
 * @Date 2015年7月28日
 * @Time 下午1:43:53
 */
public class Club {
    /**
     * 俱樂部id
     */
    private int id;
    /**
     * 俱樂部名
     */
    private String clubName;
    /**
     * 俱樂部描述
     */
    private String clubInfo;
    /**
     * 建立日期
     */
    private Date createDate;
    /**
     * 排名
     */
    private int rank;
    public Club(int id, String clubName, String clubInfo, Date createDate, int rank) {
        super();
        this.id = id;
        this.clubName = clubName;
        this.clubInfo = clubInfo;
        this.createDate = createDate;
        this.rank = rank;
    }
    public Club() {
        super();
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getClubName() {
        return clubName;
    }
    public void setClubName(String clubName) {
        this.clubName = clubName;
    }
    public String getClubInfo() {
        return clubInfo;
    }
    public void setClubInfo(String clubInfo) {
        this.clubInfo = clubInfo;
    }
    public Date getCreateDate() {
        return createDate;
    }
    public void setCreateDate(Date createDate) {
        this.createDate = createDate;
    }
    public int getRank() {
        return rank;
    }
    public void setRank(int rank) {
        this.rank = rank;
    }
    @Override
    public String toString() {
        return "Club [id=" + id + ", clubName=" + clubName + ", clubInfo=" + clubInfo + ", createDate=" + createDate
                + ", rank=" + rank + "]";
    }
}

2. 單元測試：

package com.sohu.tv.ehcache.first;
import java.util.Date;
import org.junit.BeforeClass;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Element;
/**
 * 第一個ehcache測試
 * 
 * @author leifu
 * @Date 2015年8月12日
 * @Time 上午10:14:13
 */
public class FirstEhcacheTest {
    private static Logger logger = LoggerFactory.getLogger(FirstEhcacheTest.class);
    private static Cache cache;
    @BeforeClass
    public static void setUp() {
        CacheManager cacheManager = CacheManager.create(FirstEhcacheTest.class.getClassLoader().getResourceAsStream("ehcache.xml"));
        // 列印cacheManager管理的cache
        String[] cacheNameArr = cacheManager.getCacheNames();
        for (String cacheName : cacheNameArr) {
            logger.info("cacheName: {}", cacheName);
        }
        cache = cacheManager.getCache("firstEhcache");
    }
    @Test
    public void testCRUD() {
        logger.info("At start, ehcache object size: {}", cache.getSize());
        // 唯一key
        String key = "football:club:1";
        Club club = new Club(1, "AC", "AC米蘭", new Date(), 1);
        // 增
        Element element = new Element(key, club);
        cache.put(element);
        logger.info("after add ehcache object size: {}", cache.getSize());
        // 查
        Element elementResult = cache.get(key);
        Club clubResult = (Club) elementResult.getObjectValue();
        logger.info("get key {} value is {}", key, clubResult.toString());
        // 修改
        club.setRank(8888);
        cache.put(element);
        logger.info("after set ehcache object size: {}", cache.getSize());
        // 再查
        Element elementResultAgain = cache.get(key);
        Club clubResultAgain = (Club) elementResultAgain.getObjectValue();
        logger.info("get key {} again value is {}", key, clubResultAgain.toString());
        // 删
        boolean removeResult = cache.remove(key);
        logger.info("remove result is {}, after remove ehcache object size: {}", removeResult, cache.getSize());
        // 增加一條，觀察下次啟動
        cache.put(element);
        logger.info("At final, ehcache object size: " + cache.getSize());
        // 生産環境不要使用，影響性能
        logger.info("At final, ehcache memory size: " + cache.calculateInMemorySize());
    }
}

五、輸出：

10:43:11.405 [main] INFO c.s.t.ehcache.first.FirstEhcacheTest - cacheName: firstEhcache
10:43:11.410 [main] INFO c.s.t.ehcache.first.FirstEhcacheTest - At start, ehcache object size: 0
10:43:11.413 [main] INFO c.s.t.ehcache.first.FirstEhcacheTest - after add ehcache object size: 1
10:43:11.416 [main] INFO c.s.t.ehcache.first.FirstEhcacheTest - get key football:club:1 value is Club [id=1, clubName=AC, clubInfo=AC米蘭, createDate=Wed Aug 12 10:43:11 CST 2015, rank=1]
10:43:11.416 [main] INFO c.s.t.ehcache.first.FirstEhcacheTest - after set ehcache object size: 1
10:43:11.417 [main] INFO c.s.t.ehcache.first.FirstEhcacheTest - get key football:club:1 again value is Club [id=1, clubName=AC, clubInfo=AC米蘭, createDate=Wed Aug 12 10:43:11 CST 2015, rank=8888]
10:43:11.417 [main] INFO c.s.t.ehcache.first.FirstEhcacheTest - remove result is true, after remove ehcache object size: 0
10:43:11.417 [main] INFO c.s.t.ehcache.first.FirstEhcacheTest - At final, ehcache object size: 1
10:43:11.418 [main] INFO c.s.t.ehcache.first.FirstEhcacheTest - At final, ehcache memory size: 1

六、結論、注意、猜想：

1. 如果沒有配置diskStore作為持久化資料源，每次啟動時候ehcache都是空的(因為ehcache是程序内緩存，會伴随着JVM的結束而消失)

2. ehcache接口中 put代表了add和set。

3. 官方文檔中說：cache.calculateInMemorySize()這個方法不要在生産環境中使用，會影響性能。

4. Ehcache的增删改查API使用十分簡單。

Ehcache優化配置相當多：各個層級資料容量大小、key過期政策算法、overFlow政策、序列化等等。

BigMemory系列文章--2.Ehcache快速接入轉載請注明出處哈:http://carlosfu.iteye.com/blog/2237511

轉載請注明出處哈: http://carlosfu.iteye.com/blog/2237511

1. 一個實體類：

2. 單元測試：

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