spring3.0+Atomikos 构建jta的分布式事务

spring3.0+Atomikos 构建jta的分布式事务

spring3.0已经不再支持jtom了，不过我们可以用第三方开源软件atomikos([url]http://www.atomikos.com/[/url])来实现．
Atomikos是目前在分布式事务管理中做得相当不错的开源软件。有10年以上的经验,Atomikos保障您的关键事务和
防止昂贵的数据丢失在发生系统故障或事故中．Atomikos支持XA(全局事务)和NON-XA(非全局事务)，NON-XA效率高
于XA.本文主要是讲XA事件,因为要在不同的数据库中操作多张表．

接下来说一下怎么和spring3.0结合使用

首先要下载spring3.0的相关jar包．这个相信对大家说来不难

第二．下载Atomikos,需要以下这些包

atomikos-util-1.0.jar
cglib-nodep-2.2.2.jar
transactions-3.7.0.jar
transactions-api-3.7.0.jar
transactions-jdbc-3.7.0.jar
transactions-jta-3.7.0.jar

第三．配置
在applicationContext.xml文件当中作如下配置

<?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:jee="http://www.springframework.org/schema/jee"
	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-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/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"
	default-lazy-init="true">

	<!-- spring atomikos 配置　开始-->
	<!-- mysql数据源 -->
	<bean id="mysqlDS" class="com.atomikos.jdbc.AtomikosDataSourceBean"
		init-method="init" destroy-method="close">
		<description>mysql xa datasource</description>
		<property name="uniqueResourceName">
			<value>mysql_ds</value>
		</property>
		<property name="xaDataSourceClassName" value="com.mysql.jdbc.jdbc2.optional.MysqlXADataSource" />
		<property name="xaProperties">
			<props>
				<prop key="user">userName</prop>
				<prop key="password">password</prop>
				<prop key="URL">jdbc\:mysql\://127.0.0.1\:3306/dataBaseName?autoReconnect\=true</prop>
			</props>
		</property>
		<!-- 连接池里面连接的个数? --> 
		<property name="poolSize" value="3"/> 
	</bean>

	<!-- oracle数据源 -->
	<bean id="oracleDS" class="com.atomikos.jdbc.AtomikosDataSourceBean"
		init-method="init" destroy-method="close">
		<description>oracle xa datasource</description>
		<property name="uniqueResourceName">
			<value>oracle_ds</value>
		</property>
		<property name="xaDataSourceClassName">
			<value>oracle.jdbc.xa.client.OracleXADataSource</value>
		</property>
		<property name="xaProperties">
			<props>
				<prop key="user">userName</prop>
				<prop key="password">password</prop>
				<prop key="URL">jdbc\:oracle\:thin\:@127.0.0.1\:1521\:dataBaseName</prop>
			</props>
		</property>
		<!-- 连接池里面连接的个数? --> 
		<property name="poolSize" value="3"/>
	</bean>

	<!-- atomikos事务管理器 -->
	<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="atomikosUserTransaction" class="com.atomikos.icatch.jta.UserTransactionImp">
		<property name="transactionTimeout" value="300" />
	</bean>

	<!-- spring 事务管理器 -->
	<bean id="springTransactionManager"
		class="org.springframework.transaction.jta.JtaTransactionManager">
		<property name="transactionManager">
			<ref bean="atomikosTransactionManager" />
		</property>
		<property name="userTransaction">
			<ref bean="atomikosUserTransaction" />
		</property>
	</bean>

	<!-- spring　事务模板 我在项目当中用的是编程式事务-->
	<bean id="transactionTemplate"
		class="org.springframework.transaction.support.TransactionTemplate">
		<property name="transactionManager">
			<ref bean="springTransactionManager" />
		</property>
	</bean>

	<bean id="simpleJdbcTemplate" class="org.springframework.jdbc.core.simple.SimpleJdbcTemplate">
		<constructor-arg>
			<ref bean="mysqlDS" />
		</constructor-arg>
	</bean>

	<bean id="simplejdbcTemplateOra" class="org.springframework.jdbc.core.simple.SimpleJdbcTemplate">
		<constructor-arg>
			<ref bean="oracleDS" />
		</constructor-arg>
	</bean>

	<!-- spring atomikos 配置　结束-->

	<!-- 接下来就是具体的Dao的配置 -->
	<bean id="oracleJtaDao" class="com.dao.TerminalOracleJtaDao">
		<property name="simplejdbcTemplateOra">
			<ref bean="simplejdbcTemplateOra" />
		</property>
		<property name="transactionTemplate">
			<ref bean="transactionTemplate" />
		</property>
	</bean>

	<bean id="myaqlJtaDao" class="com.dao.TerminalMyaqlJtaDao">
		<property name="simpleJdbcTemplate">
			<ref bean="simpleJdbcTemplate" />
		</property>
		<property name="transactionTemplate">
			<ref bean="transactionTemplate" />
		</property>
	</bean>
</beans>

第四．在src文件夹下面加入一个jta.properties文件．
文件内容如下，这个文件是必须的．主是是设置atomikos启动的一些参数，比如日志的输出级别，日志文件的名称等．

# SAMPLE PROPERTIES FILE FOR THE TRANSACTION SERVICE
# THIS FILE ILLUSTRATES THE DIFFERENT SETTINGS FOR THE TRANSACTION MANAGER
# UNCOMMENT THE ASSIGNMENTS TO OVERRIDE DEFAULT VALUES;

# Required: factory implementation class of the transaction core.
# NOTE: there is no default for this, so it MUST be specified! 
# 
com.atomikos.icatch.service=com.atomikos.icatch.standalone.UserTransactionServiceFactory


# Set base name of file where messages are output 
# (also known as the 'console file').
#
com.atomikos.icatch.console_file_name = tm.out

# Size limit (in bytes) for the console file;
# negative means unlimited.
#
# com.atomikos.icatch.console_file_limit=-1

# For size-limited console files, this option
# specifies a number of rotating files to 
# maintain.
#
# com.atomikos.icatch.console_file_count=1

# Set the number of log writes between checkpoints
#
# com.atomikos.icatch.checkpoint_interval=500

# Set output directory where console file and other files are to be put
# make sure this directory exists!
#
# com.atomikos.icatch.output_dir = ./

# Set directory of log files; make sure this directory exists!
#
# com.atomikos.icatch.log_base_dir = ./

# Set base name of log file
# this name will be  used as the first part of 
# the system-generated log file name
#
com.atomikos.icatch.log_base_name = tmlog

# Set the max number of active local transactions 
# or -1 for unlimited.
#
# com.atomikos.icatch.max_actives = 50

# Set the default timeout (in milliseconds) for local transactions
#
# com.atomikos.icatch.default_jta_timeout = 10000

# Set the max timeout (in milliseconds) for local transactions
#
# com.atomikos.icatch.max_timeout = 300000

# The globally unique name of this transaction manager process
# override this value with a globally unique name
#
com.atomikos.icatch.tm_unique_name = tm

# Do we want to use parallel subtransactions? JTA's default
# is NO for J2EE compatibility
#
# com.atomikos.icatch.serial_jta_transactions=true

# If you want to do explicit resource registration then
# you need to set this value to false.
#
# com.atomikos.icatch.automatic_resource_registration=true  

# Set this to WARN, INFO or DEBUG to control the granularity
# of output to the console file.
#
com.atomikos.icatch.console_log_level=INFO

# Do you want transaction logging to be enabled or not?
# If set to false, then no logging overhead will be done
# at the risk of losing data after restart or crash.
#
# com.atomikos.icatch.enable_logging=true

# Should two-phase commit be done in (multi-)threaded mode or not?
# Set this to false if you want commits to be ordered according
# to the order in which resources are added to the transaction.
#
# NOTE: threads are reused on JDK 1.5 or higher. 
# For JDK 1.4, thread reuse is enabled as soon as the 
# concurrent backport is in the classpath - see 
# http://mirrors.ibiblio.org/pub/mirrors/maven2/backport-util-concurrent/backport-util-concurrent/
#
# com.atomikos.icatch.threaded_2pc=false

# Should shutdown of the VM trigger shutdown of the transaction core too?
#
# com.atomikos.icatch.force_shutdown_on_vm_exit=false

第五．具体应用
在需要分布事务处理的地方手动开启事务

TransactionTemplate.getTransactionTemplate().execute(new TransactionCallback(){
    public Object doInTransaction(TransactionStatus status){
        boolean flag = true;
        try {

        } catche (Exception e){
            flag = false;
        } finally {
            if (!flag) {
                status.status.setRollbackOnly();	
            }
        }
    }
})

至于怎么与hibernate,mybatis这些整合使用，应该也不难，把数据源换成atomikos数据源应该就差不多了．
如果想了解更多有关atomikos的用法，可以查看这个链接[url]http://www.atomikos.com/Documentation/IntegratingTransactionEssentials[/url]