tcc-transaction 1.2.x 学习笔记

tcc-transaction 1.2.x 学习笔记

概述

• 参考
  
  • https://github.com/changmingxie/tcc-transaction/wiki/%E4%BD%BF%E7%94%A8%E6%8C%87%E5%8D%971.2.x
  • https://github.com/changmingxie/tcc-transaction

启动

• checkout master-1.2.x
• 执行 tcc-transaction-tutorial-sample/tcc-transaction-dubbo-sample/src/main/dbscripts 创建相应的库表,CAP_TRADE_ORDER/RED_TRADE_ORDER补上version字段
• 修改tcc-transaction-dubbo-sample/tcc-transaction-sample-domain各项目相应的jdbc/zookeeper配置文件连接信息
• 分别打包,启动capital/redpacket/order服务,capital以dubbo:service方式提供资金账号服务,redpacket以dubbo:service方式提供红包账号服务,order以dubbo:reference方式消费账号与红包服务
• 通过order提供的商品列表,进行购买行为,完成tcc调用,正常日志如下

order-log
order try make payment called.time seq:2018-06-19 14:44:46
order confirm make payment called. time seq:2018-06-19 14:44:57

capital-log
capital try record called. time seq:2018-06-19 14:44:47
capital confirm record called. time seq:2018-06-19 14:45:08

redpacket-log
red packet try record called. time seq:2018-06-19 14:44:49
red packet confirm record called. time seq:2018-06-19 14:45:09

源码分析

org.mengyun.tcctransaction.api.Compensable—-入口

• 通过Compensable注解,传递confirmMethod、cancelMethod方法

切面和拦截—-CompensableTransactionAspect/CompensableTransactionInterceptor

• CompensableTransactionAspect—-定义切入点,只要有Compensable注解的均拦截
  
  • compensableTransactionInterceptor.interceptCompensableMethod(pjp)
• CompensableTransactionInterceptor—-通过连接点ProceedingJoinPoint,获取目标对象/方法/参数,进行事务的begin、业务处理returnValue = pjp.proceed()、事务提交transactionManager.commit、或者是事务回滚transactionManager.rollback
• org.mengyun.tcctransaction.interceptor.ResourceCoordinatorAspect/org.mengyun.tcctransaction.interceptor.ResourceCoordinatorInterceptor
  
  • 通过ResourceCoordinatorInterceptor拦截器,加入事务的Participant,从而获取业务定义的confirm与cancel方法,构成confirmInvocation/cancelInvocation,进行后续的事务提交

事务管理—-org.mengyun.tcctransaction.TransactionManager—-管理事务的生命周期/异步执行/存储(委托给transactionRepository)

• 事务开始begin
• 事务提交commit
  
  • org.mengyun.tcctransaction.TransactionManager#commitTransaction
  • org.mengyun.tcctransaction.Participant#commit
    
    • 回调ResourceCoordinatorInterceptor创建的confirm,调用confirmInvocationContext,实现业务的confirm
• 事务回滚rollback
  
  • org.mengyun.tcctransaction.TransactionManager#rollbackTransaction
  • org.mengyun.tcctransaction.Transaction#rollback
    
    • org.mengyun.tcctransaction.Participant#rollback—-调用cancelInvocationContext,实现业务的cancel
• 事务上下文清理cleanAfterCompletion

事务存储—-org.mengyun.tcctransaction.TransactionRepository

• 支持jdbc/redis/zookeeper/filesystem存储事务状态