单体应用被拆分成各个独立的业务模块后,就不得不要去面对分布式事务,好在阿里已经开源分布式事务组件Seata,虽还在迭代中,难免会有bug产生,但随着社区发展及反馈,相信终究会越来越稳定,话不多说让我们开始吧。
spring-boot.version:2.2.5.RELEASE
spring-cloud.version:Hoxton.SR3
seata.version:1.2.0
项目模块说明如下:
前端请求接口经由网关服务进行路由转发后进入cloud-web模块,经cloud-web模块调用相应业务微服务模块,执行业务逻辑后响应前端请求。
1.下载Seata服务端部署文件
https://github.com/seata/seata/releases/download/v1.2.0/seata-server-1.2.0.zip
如嫌下载慢,可关注本文下方微信公众号二维码,关注后回复“666”即可获取开发常用工具包
2.解压至本地目录后,执行seata-server.bat脚本,过程中无报错则说明部署正常,Linux环境下操作类似不做展开说明
部分pom.xml,后续模块引入seata依赖一样,后续模块不再单独说明
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-seata</artifactId>
<version>2.2.0.RELEASE</version>
<exclusions>
<exclusion>
<groupId>io.seata</groupId>
<artifactId>seata-spring-boot-starter</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>io.seata</groupId>
<artifactId>seata-spring-boot-starter</artifactId>
<version>1.2.0</version>
</dependency>
application.properties ,后续模块引入seata配置项大致一样,根据业务模块调整3个配置项即可,后续模块不再单独说明
# seata配置
seata.enabled=true
#seata.excludes-for-auto-proxying=firstClassNameForExclude,secondClassNameForExclude
seata.application-id=cloud-web
seata.tx-service-group=cloud-web_tx_group
seata.enable-auto-data-source-proxy=true
seata.use-jdk-proxy=false
seata.client.rm.async-commit-buffer-limit=1000
seata.client.rm.report-retry-count=5
seata.client.rm.table-meta-check-enable=false
seata.client.rm.report-success-enable=false
seata.client.rm.saga-branch-register-enable=false
seata.client.rm.lock.retry-interval=10
seata.client.rm.lock.retry-times=30
seata.client.rm.lock.retry-policy-branch-rollback-on-conflict=true
seata.client.tm.commit-retry-count=5
seata.client.tm.rollback-retry-count=5
seata.client.tm.degrade-check=false
seata.client.tm.degrade-check-allow-times=10
seata.client.tm.degrade-check-period=2000
seata.client.undo.data-validation=true
seata.client.undo.log-serialization=jackson
seata.client.undo.only-care-update-columns=true
seata.client.undo.log-table=undo_log
seata.client.log.exceptionRate=100
seata.service.vgroup-mapping.cloud-web_tx_group=default
seata.service.grouplist.default=${
cloud-web.seata.service.grouplist.default}
seata.service.enable-degrade=false
seata.service.disable-global-transaction=false
seata.transport.shutdown.wait=3
seata.transport.thread-factory.boss-thread-prefix=NettyBoss
seata.transport.thread-factory.worker-thread-prefix=NettyServerNIOWorker
seata.transport.thread-factory.server-executor-thread-prefix=NettyServerBizHandler
seata.transport.thread-factory.share-boss-worker=false
seata.transport.thread-factory.client-selector-thread-prefix=NettyClientSelector
seata.transport.thread-factory.client-selector-thread-size=1
seata.transport.thread-factory.client-worker-thread-prefix=NettyClientWorkerThread
seata.transport.thread-factory.worker-thread-size=default
seata.transport.thread-factory.boss-thread-size=1
seata.transport.type=TCP
seata.transport.server=NIO
seata.transport.heartbeat=true
seata.transport.serialization=seata
seata.transport.compressor=none
seata.transport.enable-client-batch-send-request=true
seata.config.type=file
seata.registry.type=file
重点3个配置项需要调整下,其余保持默认
seata.application-id=cloud-web
seata.tx-service-group=cloud-web_tx_group
seata.service.vgroup-mapping.cloud-web_tx_group=default
OrderController.java
@RestController
@RequestMapping(value = "/order")
public class OrderController {
@Autowired
OrderFacade orderFacade;
@GlobalTransactional
@GetMapping("/add")
public String add(@RequestParam("cartId") Long cartId){
orderFacade.addOrder(cartId);
return "OK";
}
}
在需要开启分布式事务的方法上添加@GlobalTransactional注解即可
@RestController
public class OrderService implements OrderFacade {
@Autowired
private TbOrderMapper tbOrderMapper;
@Autowired
private CartFacade cartFacade;
@Autowired
private GoodsFacade goodsFacade;
@Autowired
private WalletFacade walletFacade;
/**
*
* 功能:新增订单
*
* @param cartId 购物车ID
* @author wuyubin
* @date 2020年05月22日
* @return
*/
@Override
public void addOrder(Long cartId) {
CartDTO cart = cartFacade.getCartById(cartId);
TbOrder order = new TbOrder();
order.setUserId(cart.getUserId());
order.setGoodsId(cart.getGoodsId());
order.setOrderNo(String.valueOf(System.currentTimeMillis()));
order.setCreateTime(System.currentTimeMillis());
order.setUpdateTime(order.getCreateTime());
order.setIsDeleted(Byte.valueOf("0"));
// 新增订单
tbOrderMapper.insert(order);
// 删除购物车
cartFacade.deleteCartById(cartId);
GoodsDTO goods = goodsFacade.getByGoodsId(cart.getGoodsId());
// 扣减库存
goodsFacade.substractStock(goods.getId());
// 扣减金额
walletFacade.substractMoney(cart.getUserId(),goods.getMoney());
throw new RuntimeException();
}
@RestController
public class CartService implements CartFacade {
Logger LOGGER = LoggerFactory.getLogger(CartService.class);
@Autowired
private TbCartMapper tbCartMapper;
/**
*
* 功能:增加商品至购物车
*
* @param userId 用户ID
* @param goodsId 商品ID
* @author wuyubin
* @date 2020年05月22日
* @return
*/
@Override
public String addCart(Long userId,Long goodsId) {
TbCart cart = new TbCart();
cart.setUserId(userId);
cart.setGoodsId(goodsId);
cart.setCreateTime(System.currentTimeMillis());
cart.setUpdateTime(cart.getCreateTime());
cart.setIsDeleted(Byte.valueOf("0"));
tbCartMapper.insert(cart);
return null;
}
/**
*
* 功能:获取购物车信息
*
* @param cartId 购物车ID
* @author wuyubin
* @date 2020年05月22日
* @return
*/
@Override
public CartDTO getCartById(Long cartId) {
CartDTO cartDTO = null;
TbCart cart = tbCartMapper.selectById(cartId);
if (null != cart) {
cartDTO = new CartDTO();
cartDTO.setUserId(cart.getUserId());
cartDTO.setGoodsId(cart.getGoodsId());
}
return cartDTO;
}
/**
*
* 功能:删除购物车信息
*
* @param cartId 购物车ID
* @author wuyubin
* @date 2020年05月22日
* @return
*/
@Override
public void deleteCartById(Long cartId) {
tbCartMapper.deleteById(cartId);
}
}
@RestController
public class GoodsService implements GoodsFacade {
@Autowired
private TbGoodsMapper tbGoodsMapper;
/**
*
* 功能:获取商品信息
*
* @param goodsId 商品ID
* @author wuyubin
* @date 2020年05月22日
* @return
*/
@Override
public GoodsDTO getByGoodsId(Long goodsId) {
GoodsDTO goodsDTO = null;
TbGoods goods = tbGoodsMapper.selectById(goodsId);
if (null != goods) {
goodsDTO = new GoodsDTO();
BeanUtils.copyProperties(goods,goodsDTO);
}
return goodsDTO;
}
/**
*
* 功能:扣减商品库存
*
* @param goodsId 商品ID
* @author wuyubin
* @date 2020年05月22日
* @return
*/
@Override
public void substractStock(@RequestParam("goodsId") Long goodsId) {
if (tbGoodsMapper.updateSubstractStockNumById(goodsId) != 1) {
throw new RuntimeException("扣减库存异常");
}
}
}
@RestController
public class WalletService implements WalletFacade {
@Autowired
private TbWalletMapper tbWalletMapper;
/**
*
* 功能:扣减用户钱包金额
*
* @param userId 用户ID
* @param money 金额
* @author wuyubin
* @date 2020年05月22日
* @return
*/
@Override
public void substractMoney(Long userId, BigDecimal money) {
if (tbWalletMapper.updateSubstractMoney(userId,money) != 1) {
throw new RuntimeException("用户金额异常");
}
}
}
undo_log 表:seata依赖表
CREATE TABLE `undo_log` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`branch_id` bigint(20) NOT NULL,
`xid` varchar(100) NOT NULL,
`context` varchar(128) NOT NULL,
`rollback_info` longblob NOT NULL,
`log_status` int(11) NOT NULL,
`log_created` datetime NOT NULL,
`log_modified` datetime NOT NULL,
`ext` varchar(100) DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
tb_cart 表:购物车表
CREATE TABLE `tb_cart` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键',
`user_id` bigint(20) NULL DEFAULT NULL COMMENT '用户ID',
`goods_id` bigint(20) NULL DEFAULT NULL COMMENT '商品ID',
`create_time` bigint(20) NULL DEFAULT NULL COMMENT '创建时间戳',
`update_time` bigint(20) NULL DEFAULT NULL COMMENT '更新时间戳',
`is_deleted` tinyint(4) NULL DEFAULT 0 COMMENT '删除标志 0:未删除;1:已删除',
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '购物车表' ROW_FORMAT = Dynamic;
-- 初始化数据
INSERT INTO `tb_cart` VALUES (1, 1, 1, 1590114829756, 1590114829756, 0);
tb_goods 表:商品表
CREATE TABLE `tb_goods` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键',
`name` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '商品名称',
`stock_num` bigint(20) NULL DEFAULT NULL COMMENT '商品库存数量',
`money` decimal(10, 2) NULL DEFAULT NULL COMMENT '商品金额',
`create_time` bigint(20) NULL DEFAULT NULL COMMENT '创建时间戳',
`update_time` bigint(20) NULL DEFAULT NULL COMMENT '更新时间戳',
`is_deleted` tinyint(4) NULL DEFAULT NULL COMMENT '删除标志 0:未删除;1:已删除',
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '商品表' ROW_FORMAT = Dynamic;
-- 初始化数据
INSERT INTO `tb_goods` VALUES (1, '键盘', 100, 100.00, 1590132270000, 1590377130, 0);
tb_wallet 表:钱包表
CREATE TABLE `tb_wallet` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键',
`user_id` bigint(20) NULL DEFAULT NULL COMMENT '用户ID',
`money` decimal(10, 2) NULL DEFAULT NULL COMMENT '金额',
`create_time` bigint(20) NULL DEFAULT NULL COMMENT '创建时间戳',
`update_time` bigint(20) NULL DEFAULT NULL COMMENT '更新时间戳',
`is_deleted` tinyint(4) NULL DEFAULT NULL COMMENT '删除标志 0:未删除;1:已删除',
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '钱包表' ROW_FORMAT = Dynamic;
-- 初始化数据
INSERT INTO `tb_wallet` VALUES (1, 1, 500.00, 1590132270000, 1590377130, 0);
tb_order 表:订单表
CREATE TABLE `tb_order` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键',
`order_no` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '订单编号',
`user_id` bigint(20) NULL DEFAULT NULL COMMENT '用户ID',
`goods_id` bigint(20) NULL DEFAULT NULL COMMENT '商品ID',
`create_time` bigint(20) NULL DEFAULT NULL COMMENT '创建时间',
`update_time` bigint(20) NULL DEFAULT NULL COMMENT '更新时间',
`is_deleted` tinyint(4) NULL DEFAULT 0 COMMENT '是否删除 0:未删除;1:已删除',
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '订单表' ROW_FORMAT = Dynamic;
所有服务启动后,请求以下接口
http://localhost:9005/cloud-web/order/add?cartId=1
查看各服务模块日志,你会发现均有如下信息输出,提示已回滚
因为在order模块中addOrder方法下,我这边人为抛出一个运行时异常,看样子事务已经生效了
我们看下数据库中数据是否已回滚正常,核实后发现数据均以回滚
接下来我们把order模块中addOrder方法下将“throw new RuntimeException();”代码块注释掉,重启订单模块服务后再次访问上述接口地址,发现访问正常
查看各服务模块日志,你会发现均有如下信息输出,提示已提交成功
我们再一次核实下数据表中的数据
购物车表已将原先记录逻辑删除
订单表新增一条订单记录
商品表库存数量已扣减1
钱包表金额已扣减100
最后我们测试其中一个服务出现异常,验证下事务是否回滚正常,我们将购物车表逻辑删除恢复正常,将商品表库存改成0,这时我们再请求上述接口地址,发现返回异常了,我们再核实下数据,发现数据表中的数据均以回滚。好啦,SpringCloud集成分布式事务Seata的示例就到这里啦,后续有深入的研究再分享出来。
https://github.com/seata/seata
https://seata.io/zh-cn/docs/overview/what-is-seata.html
SpringCloud系列之配置中心(Config)使用说明
SpringCloud系列之服务注册发现(Eureka)应用篇
SpringCloud系列之网关(Gateway)应用篇
SpringCloud系列之集成Dubbo应用篇
项目源码