July 2013 Posts

Welcome Home, My New Hard Rock Cafe Wrist Watch

welcome home dear (L)

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A Simple Caching Example on MyBatis using EhCache

Today i will show a simple example on how to combine ehcache caching framework with MyBatis ORM. I use Maven as my build tool, and Netbeans as my IDE.

Okay, here is my pom.xml,

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.edw.ehcache</groupId>
    <artifactId>MyBatisEhCache</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>MyBatisEhCache</name>
    <url>http://maven.apache.org</url>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.2.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.caches</groupId>
            <artifactId>mybatis-ehcache</artifactId>
            <version>1.0.2</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>      
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
        <dependency>
            <groupId>net.sf.ehcache</groupId>
            <artifactId>ehcache</artifactId>
            <version>2.7.0</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.5</version>
        </dependency>     
    </dependencies>
</project>

And i create a simple mysql table,

CREATE TABLE `testing` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(30) NOT NULL DEFAULT '',
  `address` varchar(255) NOT NULL DEFAULT '',
  PRIMARY KEY (`Id`),
  UNIQUE KEY `ix` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=latin1;

and a simple bean and xml representation from my table,

package com.edw.mybatisehcache.bean;

import java.io.Serializable;

public class Testing implements Serializable  {

    private Integer id;
    private String name;
    private String address;

    // setter and getter

    @Override
    public String toString() {
        return "testing{" + "id=" + id + ", name=" + name + ", address=" + address + '}';
    }            
}
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.edw.mybatisehcache.mapper.TestingMapper" >
  
     <cache type="org.mybatis.caches.ehcache.EhcacheCache"/>
    
    <resultMap id="Testings" type="com.edw.mybatisehcache.bean.Testing" >
        <id column="id" property="id" jdbcType="BIGINT" />
        <result column="name" property="name" jdbcType="VARCHAR" />
        <result column="address" property="address" jdbcType="VARCHAR" />
    </resultMap>  

    <select id="select" resultMap="Testings">
        select 
        *
        from testing    
    </select>   
</mapper>

An xml configuration to load my database connection,

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <environments default="development">
       <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="UNPOOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost/test"/>
                <property name="username" value="root"/>
                <property name="password" value=""/>
            </dataSource>
        </environment>          
    </environments>
     <mappers>        		
        <mapper resource="com/edw/mybatisehcache/xml/TestingMapper.xml" />  
    </mappers>              		
</configuration>

A java code to load my xml configuration,

package com.edw.mybatisehcache.config;

import java.io.Reader;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class MyBatisSqlSessionFactory {

    private static final SqlSessionFactory FACTORY;

    static {
        try {
            Reader reader = Resources.getResourceAsReader("com/edw/mybatisehcache/xml/Configuration.xml");
            FACTORY = new SqlSessionFactoryBuilder().build(reader);
        } catch (Exception e){
            throw new RuntimeException("Fatal Error.  Cause: " + e, e);
        }
    }

    public static SqlSessionFactory getSqlSessionFactory() {
        return FACTORY;
    }
}

A java interface to do handle queries,

package com.edw.mybatisehcache.mapper;

import com.edw.mybatisehcache.bean.Testing;
import java.util.List;

public interface TestingMapper {
    public List<Testing> select();    
}

And this is my ehcache.xml configuration,

<?xml version="1.0" encoding="UTF-8"?>
<!--
    caching configuration
-->
<ehcache>
    
    <diskStore path="F:\\cache" />
    
    <defaultCache eternal="true" maxElementsInMemory="1000"
                   overflowToDisk="true" diskPersistent="true" timeToIdleSeconds="0"
                   timeToLiveSeconds="0" memoryStoreEvictionPolicy="LRU" statistics="true" />
</ehcache>

This is my main java class, as you can see i try to do a repeated simple select queries,

package com.edw.mybatisehcache.main;

import com.edw.mybatisehcache.bean.Testing;
import com.edw.mybatisehcache.config.MyBatisSqlSessionFactory;
import com.edw.mybatisehcache.mapper.TestingMapper;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.log4j.Logger;

public class Main {

    private static Logger logger = Logger.getLogger(Main.class);

    public static void main(String[] args) {

        for (int i = 0; i < 3; i++) {
            SqlSessionFactory sqlSessionFactory = MyBatisSqlSessionFactory.getSqlSessionFactory();
            SqlSession sqlSession = sqlSessionFactory.openSession();
            TestingMapper testingMapper = sqlSession.getMapper(TestingMapper.class);

            List<Testing> testings = testingMapper.select();
            for (Testing testing : testings) {
                logger.debug(testing);
            }
            sqlSession.close();

            try {
                Thread.sleep(3000);
            } catch (Exception e) {
                logger.error(e, e);
            }
        }
    }
}

This is what is written on my netbeans’ console,

2013-07-25 15:30:10,648 [Segment] DEBUG net.sf.ehcache.store.disk.Segment:779 - fault removed 0 from heap
2013-07-25 15:30:10,648 [Segment] DEBUG net.sf.ehcache.store.disk.Segment:796 - fault added 0 on disk
2013-07-25 15:30:13,722 [Cache] DEBUG net.sf.ehcache.Cache:1970 - Cache: com.edw.mybatisehcache.mapper.TestingMapper store hit for 2026218237:1652924294:com.edw.mybatisehcache.mapper.TestingMapper.select:0:2147483647:select 
        *
        from testing
2013-07-25 15:30:13,722 [Main] DEBUG com.edw.mybatisehcache.main.Main:24 - testing{id=1, name=edw, address=Ciledug}
2013-07-25 15:30:13,722 [Main] DEBUG com.edw.mybatisehcache.main.Main:24 - testing{id=2, name=kamplenk, address=Cikokol}
2013-07-25 15:30:13,722 [Main] DEBUG com.edw.mybatisehcache.main.Main:24 - testing{id=3, name=nugie, address=Pamulang}
2013-07-25 15:30:13,722 [Main] DEBUG com.edw.mybatisehcache.main.Main:24 - testing{id=4, name=tebek, address=Karawaci}

Here is my Netbeans project structure

Have fun (K)

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Unable to Delete Dist Folder from Netbeans’ Build.xml File

I found this weird error when building my java application into jar from Netbeans, somehow Netbeans shows error due to unreadable dist folder. And the weird thing is, i cannot delete the dist folder manually, it keeps giving me the Folder Access Denied dialog box with choices to “Try Again” or “Cancel”. I also have tried changing permissions in the properties window but it does not seem to work.

Well the workaround is actually simple, i just open task manager, and end explorer.exe process. And i dont know why, but my dist folder is gone. Very weird actually :-D

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