分佈式事務JTA實現之:SSM+ATOMIKOS

1.JTA事物

Java事務API（Java Transaction API，簡稱JTA ）是一個Java企業版的應用程序接口，在Java環境中，允許完成跨越多個XA資源的分佈式事務.
一個分佈式的事務涉及一個事務管理器和一個或者多個資源管理器。一個資源管理器是任何類型的持久性的數據存儲。事務管理器負責協調所有事務參與者之間的通信。

常見的JTA實現有以下幾種:
1.J2EE容器所提供的JTA實現(JBoss中jndi容器事物配置)
2.獨立的JTA實現:如JOTM，Atomikos等開源事物管理器
這些實現可以應用在那些不使用J2EE應用服務器的環境裏用以提供分佈事事務保證。如Tomcat,Jetty以及普通的java應用。

2.Spring+ATOMIKOS代碼實現

1.pom依賴

  <properties>  
        <!-- spring版本號 -->  
        <spring.version>4.0.2.RELEASE</spring.version>  
        <!-- mybatis版本號 -->  
        <mybatis.version>3.2.6</mybatis.version>  
        <!-- log4j日誌文件管理包版本 -->  
        <slf4j.version>1.7.7</slf4j.version>  
        <log4j.version>1.2.17</log4j.version>  
    </properties>  

    <dependencies>  
        <dependency>  
            <groupId>junit</groupId>  
            <artifactId>junit</artifactId>  
            <version>4.11</version>  
         <!--    表示開發的時候引入，發佈的時候不會加載此包   -->
            <scope>test</scope>  
        </dependency>  
      <!--   spring核心包   -->
        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-core</artifactId>  
            <version>${spring.version}</version>  
        </dependency>  

        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-web</artifactId>  
            <version>${spring.version}</version>  
        </dependency>  
        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-oxm</artifactId>  
            <version>${spring.version}</version>  
        </dependency>  
        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-tx</artifactId>  
            <version>${spring.version}</version>  
        </dependency>  

        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-jdbc</artifactId>  
            <version>${spring.version}</version>  
        </dependency>  

        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-webmvc</artifactId>  
            <version>${spring.version}</version>  
        </dependency>  
        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-aop</artifactId>  
            <version>${spring.version}</version>  
        </dependency>  

        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-context-support</artifactId>  
            <version>${spring.version}</version>  
        </dependency>  
      <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>
        <dependency>  
            <groupId>org.springframework</groupId>  
            <artifactId>spring-test</artifactId>  
            <version>${spring.version}</version>  
        </dependency>  
<!--         mybatis核心包   -->
        <dependency>  
            <groupId>org.mybatis</groupId>  
            <artifactId>mybatis</artifactId>  
            <version>${mybatis.version}</version>  
        </dependency>  
   <!--      mybatis/spring包   -->
        <dependency>  
            <groupId>org.mybatis</groupId>  
            <artifactId>mybatis-spring</artifactId>  
            <version>1.2.2</version>  
        </dependency>  
<!--         導入java ee jar 包   -->
       <!--  <dependency>  
            <groupId>javax</groupId>  
            <artifactId>javaee-api</artifactId>  
            <version>7.0</version>  
        </dependency>   -->

<!--         導入dbcp的jar包，用來在applicationContext.xml中配置數據庫   -->
        <dependency>  
            <groupId>commons-dbcp</groupId>  
            <artifactId>commons-dbcp</artifactId>  
            <version>1.2.2</version>  
        </dependency>  
<!--         JSTL標籤類   -->
        <dependency>  
            <groupId>jstl</groupId>  
            <artifactId>jstl</artifactId>  
            <version>1.2</version>  
        </dependency>  
<!--         日誌文件管理包  
        log start   -->
        <dependency>  
            <groupId>log4j</groupId>  
            <artifactId>log4j</artifactId>  
            <version>${log4j.version}</version>  
        </dependency>  


<!--         格式化對象，方便輸出日誌   -->
        <dependency>  
            <groupId>com.alibaba</groupId>  
            <artifactId>fastjson</artifactId>  
            <version>1.1.41</version>  
        </dependency>  


        <dependency>  
            <groupId>org.slf4j</groupId>  
            <artifactId>slf4j-api</artifactId>  
            <version>${slf4j.version}</version>  
        </dependency>  

        <dependency>  
            <groupId>org.slf4j</groupId>  
            <artifactId>slf4j-log4j12</artifactId>  
            <version>${slf4j.version}</version>  
        </dependency>  
<!--         log end  
        映入JSON   -->
        <dependency>  
            <groupId>org.codehaus.jackson</groupId>  
            <artifactId>jackson-mapper-asl</artifactId>  
            <version>1.9.13</version>  
        </dependency>  
<!--         上傳組件包   -->
        <dependency>  
            <groupId>commons-fileupload</groupId>  
            <artifactId>commons-fileupload</artifactId>  
            <version>1.3.1</version>  
        </dependency>  
        <dependency>  
            <groupId>commons-io</groupId>  
            <artifactId>commons-io</artifactId>  
            <version>2.4</version>  
        </dependency>  
        <dependency>  
            <groupId>commons-codec</groupId>  
            <artifactId>commons-codec</artifactId>  
            <version>1.9</version>  
        </dependency>  

        <!-- atomikos 依賴-->
      <dependency>
         <groupId>com.atomikos</groupId>
         <artifactId>transactions-jdbc</artifactId>
         <version>3.9.2</version>
     </dependency>
    <dependency>
         <groupId>com.atomikos</groupId>
         <artifactId>transactions-hibernate3</artifactId>
         <version>3.9.2</version>
    </dependency>
   <dependency>
        <groupId>javax.transaction</groupId>
        <artifactId>jta</artifactId>
        <version>1.1</version>
   </dependency> 
<!-- OJDBC 依賴 -->
  <dependency>
        <groupId>oracle</groupId>
           <artifactId>ojdbc</artifactId>
          <version>6</version>
        </dependency>
</dependencies>

2.web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="web" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <display-name>application</display-name>
    <distributable/>
    <!-- 服務啓動時去加載spring上下文 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:spring.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
      <servlet>  
       <servlet-name>springmvc</servlet-name>  
       <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
           <init-param>  
        <param-name>contextConfigLocation</param-name>  
        <param-value>classpath:springMVC-servlet.xml</param-value>  
    </init-param>  
    <load-on-startup>1</load-on-startup>  
    </servlet>
     <servlet-mapping>  
    <servlet-name>springmvc</servlet-name>  
    <url-pattern>/</url-pattern>  
    </servlet-mapping>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

3.spring核心配置文件配置

<?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"
        xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
       xmlns:rabbit="http://www.springframework.org/schema/rabbit"
        xmlns:cache="http://www.springframework.org/schema/cache" xmlns:task="http://www.springframework.org/schema/task"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit.xsd
       http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd">
   <!-- 開啓spring註解掃描 -->
    <context:component-scan base-package="com.xy.service">
     <!--     <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/> -->
     </context:component-scan>
    <context:property-placeholder location="classpath:context/database.properties"/>
    <!-- 開始事物註解掃描 -->
     <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>
   <!-- Atomikos數據源配置，要實現JTA事物，數據源要實現類爲AtomikosDataSourceBean-->
  <bean id="oracleDS" class="com.atomikos.jdbc.AtomikosDataSourceBean"
        init-method="init" destroy-method="close">
        <description>oracle xa datasource</description>
        <property name="uniqueResourceName"><!-- 名稱可以任意定義 -->
            <value>oracle_ds</value>
        </property>
        <property name="xaDataSourceClassName"><!-- oracle驅動必須實現XA接口 -->
            <value>oracle.jdbc.xa.client.OracleXADataSource</value>
        </property>
        <property name="xaProperties">
            <props><!--數據庫的url，用戶名以及密碼  -->
                <prop key="user">${dev.db.user}</prop>
                <prop key="password">${dev.db.password}</prop>
                <prop key="URL">${dev.db.url}</prop>
            </props>
        </property>
        <property name="testQuery">
        <value>select 1 from dual</value> <!-- 盡力加上，不然會出現告警  -->
        </property>
    </bean>
 <bean id="oracleDS2" class="com.atomikos.jdbc.AtomikosDataSourceBean"
        init-method="init" destroy-method="close">
        <description>oracle xa datasource</description>
        <property name="uniqueResourceName">
            <value>oracle_ds1</value>
        </property>
        <property name="xaDataSourceClassName">
            <value>oracle.jdbc.xa.client.OracleXADataSource</value>
        </property>
        <property name="xaProperties">
            <props>
                <prop key="user">${qa.db.user}</prop>
                <prop key="password">${qa.db.password}</prop>
                <prop key="URL">${qa.db.url}</prop>
            </props>
        </property>
        <property name="testQuery">
        <value>select 1 from dual</value> <!-- 盡力加上，不然會出現告警  -->
        </property>
    </bean>
<!--  使用正常事物測試使用<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
        destroy-method="close">
        <property name="driverClass" value="oracle.jdbc.driver.OracleDriver"></property>
        <property name="jdbcUrl" value="${dev.db.url}"></property>
        <property name="user" value="${dev.db.user}"></property>
        <property name="password" value="${dev.db.password}"></property>
    </bean>
        <bean id="dataSource1" class="com.mchange.v2.c3p0.ComboPooledDataSource"
        destroy-method="close">
        <property name="driverClass" value="oracle.jdbc.driver.OracleDriver"></property>
        <property name="jdbcUrl" value="${qa.db.url}"></property>
        <property name="user" value="${qa.db.user}"></property>
        <property name="password" value="${qa.db.password}"></property>
    </bean> -->

    <bean id="qasqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
         <property name="dataSource" ref="oracleDS2" /><!--  oracleDS2 dataSource1-->
         <property name="mapperLocations" value="classpath:com/xy/dao/*.xml" />
     </bean>

     <bean id="devsqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
         <property name="dataSource" ref="oracleDS" /><!-- oracleDS dataSource-->
         <property name="mapperLocations" value="classpath:com/xy/daodev/*.xml" />
     </bean>

 <bean id="atomikosUserTransaction"
        class="com.atomikos.icatch.jta.UserTransactionImp">
        <description>UserTransactionImp</description>
        <property name="transactionTimeout" value="300"/>
    </bean>

    <bean id="atomikosTransactionManager"
        class="com.atomikos.icatch.jta.UserTransactionManager"
        init-method="init" destroy-method="close">
        <description>UserTransactionManager</description>
        <property name="forceShutdown">
            <value>true</value>
        </property>
    </bean>

    <bean id="transactionManager"
        class="org.springframework.transaction.jta.JtaTransactionManager">
        <description>JtaTransactionManager</description>
        <property name="transactionManager">
            <ref bean="atomikosTransactionManager" />
        </property>
        <property name="userTransaction">
            <ref bean="atomikosUserTransaction" />
        </property>
        <property name="allowCustomIsolationLevels" value="true"/> <!-- 必須設置，否則程序出現異常 JtaTransactionManager does not support custom isolation levels by default -->
    </bean> 


 <!-- 創建普通的事物管理器 -->
<!--  <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">  
        <property name="dataSource" ref="dataSource1" />  
    </bean>  -->
     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
         <property name="basePackage" value="com.xy.dao"/>
         <property name="sqlSessionFactoryBeanName" value="qasqlSessionFactory" />
     </bean>

     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
         <property name="basePackage" value="com.xy.daodev"/>
         <property name="sqlSessionFactoryBeanName" value="devsqlSessionFactory" />
    </bean>
</beans>

4.spring-MVC配置文件

   <beans xmlns="http://www.springframework.org/schema/beans"  
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"  
        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-3.2.xsd   
            http://www.springframework.org/schema/mvc   
            http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd   
            http://www.springframework.org/schema/context   
            http://www.springframework.org/schema/context/spring-context-3.2.xsd   
            http://www.springframework.org/schema/aop   
            http://www.springframework.org/schema/aop/spring-aop-3.2.xsd   
            http://www.springframework.org/schema/tx   
            http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">  

        <!-- 配置Handler，handler實現了Controller接口 -->  
        <!-- 啓用spring mvc 註解 -->
        <context:annotation-config />
       <!-- 對於註解的Handler(Controller)可以單個配置實際開發中建議使用組件掃描  -->
       <context:component-scan base-package="com.xy.controller"></context:component-scan>
         <!-- 視圖解析器這裏配置前綴爲jsp,vm所在的路徑，後綴配置爲jsp,vm,所以在Controller中返回的時候只需要進行返回文件的名稱就可以了，視             圖解析器會找到該名稱的文件進行渲染  -->  
    <bean  
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
        <!-- 配置jsp路徑的前綴 -->  
        <property name="prefix" value="/WEB-INF/jsp/"/>  
        <!-- 配置jsp路徑的後綴 -->  
        <property name="suffix" value=".jsp"/>  
    </bean> 
 </beans>

5.Controller層代碼

6.Service層代碼

7.Dao層代碼

3.JTA事物實現總結

JTA事物區別JDBC事物之處在於可以JDBC事務的範圍侷限於一個數據庫連接。一個 JDBC 事務不能跨越多個數據庫，而JTA事物可以接入多個資源管理器，實現事物的統一管理。
JTA編程之ATOMIKOS實現注意事項，要配置ATOMIKOS對應的數據源，對於不同的數據庫驅動都要實現XA接口:
oracle數據庫:oracle.jdbc.xa.client.OracleXADataSource;
myslq數據庫:com.mysql.jdbc.jdbc2.optional.MysqlXADataSource.
配置對應的事物管理器:
atomikosTransactionManager;
atomikosUserTransaction將其注入到spring管理的JTA事物管理器中   org.springframework.transaction.jta.JtaTransactionManager

到此 SMM+ATOMIKOS分佈式事務就實現,後續會繼續測試SSM+JOTM,以及JTA-容器事物的實現.

分佈式事務JTA實現之:SSM+ATOMIKOS

1.JTA事物

2.Spring+ATOMIKOS代碼實現

3.JTA事物實現總結

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