seata源码解析：seata是如何支持TCC模式的？

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介绍

增加了横切逻辑实现类

一阶段开启分支事务

TccActionInterceptor

二阶段提交/回滚分支事务

DefaultCore#commit
TCCResourceManager#branchCommit

CREATE TABLE IF NOT EXISTS `global_table`
(
    `xid`                       VARCHAR(128) NOT NULL,
    `transaction_id`            BIGINT,
    `status`                    TINYINT      NOT NULL,
    `application_id`            VARCHAR(32),
    `transaction_service_group` VARCHAR(32),
    `transaction_name`          VARCHAR(128),
    `timeout`                   INT,
    `begin_time`                BIGINT,
    `application_data`          VARCHAR(2000),
    `gmt_create`                DATETIME,
    `gmt_modified`              DATETIME,
    PRIMARY KEY (`xid`),
    KEY `idx_gmt_modified_status` (`gmt_modified`, `status`),
    KEY `idx_transaction_id` (`transaction_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8;

-- the table to store BranchSession data
CREATE TABLE IF NOT EXISTS `branch_table`
(
    `branch_id`         BIGINT       NOT NULL,
    `xid`               VARCHAR(128) NOT NULL,
    `transaction_id`    BIGINT,
    `resource_group_id` VARCHAR(32),
    `resource_id`       VARCHAR(256),
    `branch_type`       VARCHAR(8),
    `status`            TINYINT,
    `client_id`         VARCHAR(64),
    `application_data`  VARCHAR(2000),
    `gmt_create`        DATETIME(6),
    `gmt_modified`      DATETIME(6),
    PRIMARY KEY (`branch_id`),
    KEY `idx_xid` (`xid`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8;

-- the table to store lock data
CREATE TABLE IF NOT EXISTS `lock_table`
(
    `row_key`        VARCHAR(128) NOT NULL,
    `xid`            VARCHAR(128),
    `transaction_id` BIGINT,
    `branch_id`      BIGINT       NOT NULL,
    `resource_id`    VARCHAR(256),
    `table_name`     VARCHAR(32),
    `pk`             VARCHAR(36),
    `gmt_create`     DATETIME,
    `gmt_modified`   DATETIME,
    PRIMARY KEY (`row_key`),
    KEY `idx_branch_id` (`branch_id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8;

global_table

172.21.0.14:18091:6449338273221152788,6449338273221152788,1,seata-tcc-tm,my_test_tx_group,“transfer(java.lang.String, java.lang.String, java.lang.Integer)”,60000,1633261303962,2021-10-03 19:41:43,2021-10-03 19:41:43

branch_table

6449338273221152790,172.21.0.14:18091:6449338273221152788,6449338273221152788,prepare,TCC,0,seata-tcc-tm:219.238.205.162:30726,"{"“actionContext”":{"“action-start-time”":1633261303972,"“money”":200,"“sys::prepare”":"“prepare”","“fromUserId”":"“1001"”,"“sys::rollback”":"“cancel”","“sys::commit”":"“commit”","“host-name”":"“192.168.97.57"”,"“toUserId”":"“1002"”,"“actionName”":"“prepare”"}}",2021-10-03 19:41:43,2021-10-03 19:41:43

6449338273221152792,172.21.0.14:18091:6449338273221152788,6449338273221152788,prepare,TCC,0,seata-tcc-rm:219.238.205.162:30537,"{"“actionContext”":{"“action-start-time”":1633261304008,"“money”":200,"“sys::prepare”":"“prepare”","“fromUserId”":"“1001"”,"“sys::rollback”":"“cancel”","“sys::commit”":"“commit”","“host-name”":"“192.168.97.57"”,"“toUserId”":"“1002"”,"“actionName”":"“prepare”"}}",2021-10-03 19:41:44,2021-10-03 19:41:44

参考博客

[1]https://blog.csdn.net/zjj2006/article/details/108959939
[2]https://zhuanlan.zhihu.com/p/271735569

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