Spring集成Seata

Seata的集成方式有：

1. Seata-All

2. Seata-Spring-Boot-Starter

3. Spring-Cloud-Starter-Seata

本案例使用Seata-All演示：

第一步：下载Seata

第二步：为了更好看到效果，我们将Seata的数据存储改为db

将seata\script\server\db\mysql.sql语句在mysql中执行，创建相关表

然后修改seata配置文件，相关配置可以参考application.example.yml，此处修改mode为db并且配置db相关配置

启动seata：

第三步：开始集成Seata

1.在我们的项目pom.xml引入seata包（1.5.x有bug，我们使用1.4.2）

<!--seata-->
<dependency><groupId>io.seata</groupId><artifactId>seata-all</artifactId> 
</dependency>
<dependency><groupId>com.esotericsoftware</groupId><artifactId>kryo</artifactId>
</dependency>
<dependency><groupId>de.javakaffee</groupId><artifactId>kryo-serializers</artifactId>
</dependency>

2.application.properties

#环境配置
spring.profiles.active=devspring.application.name=user-service-provider
dubbo.application.id=user-service
dubbo.application.name=user-service#dubbo.protocol.port=-1
#dubbo.protocol.name=dubbo#多协议支持
dubbo.protocols.tri.name=tri
dubbo.protocols.tri.port=-1
dubbo.protocols.tri.id=tridubbo.protocols.dubbo.name=dubbo
dubbo.protocols.dubbo.port=-1
dubbo.protocols.dubbo.id=dubbo
#序列化方式
dubbo.protocols.dubbo.serialization=kryodubbo.application.logger=log4j
#调用信息跟踪-log4j 日志
#dubbo.protocol.accesslog=true
#调用信息跟踪-将访问日志输出到指定文件
#dubbo.protocol.accesslog=/log/access.log#是否简化 url
#dubbo.registry.simplified=true
#dubbo.registry.id=zk-registry
#dubbo.registry.address=zookeeper://192.168.1.105:2181?timeout=20000
#dubbo.config-center.address=zookeeper://192.168.1.105:2181?timeout=20000
#dubbo.metadata-report.address=zookeeper://192.168.1.105:2181?timeout=20000
#多注册中心
#dubbo.registries.zk-registry.id=zk-registry
#dubbo.registries.zk-registry.address=zookeeper://192.168.1.105:2181?timeout=20000&blockUntilConnectedWait=30
dubbo.registries.nacos-registry.id=nacos-registry
dubbo.registries.nacos-registry.address=nacos://192.168.1.105:8848
#dubbo.registries.nacos-registry.address=nacos://192.168.1.105:8848?namespace=2e73933a-34d4-4fba-b21e-f08cd9b8adc9
dubbo.registry.use-as-config-center=false
dubbo.registry.use-as-metadata-center=false#nacos配置中心
nacos.config.server-addr=192.168.1.105:8848#mybatis
mybatis.mapper-locations= classpath*:com/lee/demo/dubbo/demo/dao/*Mapper.xml
mybatis.type-aliases-package=com.lee.demo.dubbo.demo.entity#datasource
spring.datasource.url=jdbc:mysql://localhost:3308/coupon-platform?useUnicode=true&characterEncoding=utf8&useOldAliasMetadataBehavior=true&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=Aa1225102411
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

3.在resources目录下添加配置文件file.conf和registry.conf，seata会扫描这两个配置文件从而获取相关配置。

registry.conf：

registry {# file 、nacos 、eureka、redis、zk、consul、etcd3、sofatype = "file"file {name = "file.conf"}
}config {# file、nacos 、apollo、zk、consul、etcd3type = "file"file {name = "file.conf"}
}

file.conf：

transport {# tcp, unix-domain-sockettype = "TCP"#NIO, NATIVEserver = "NIO"#enable heartbeatheartbeat = true# the tm client batch send request enableenableTmClientBatchSendRequest = false# the rm client batch send request enableenableRmClientBatchSendRequest = true# the rm client rpc request timeoutrpcRmRequestTimeout = 2000# the tm client rpc request timeoutrpcTmRequestTimeout = 10000# the tc client rpc request timeoutrpcTcRequestTimeout = 5000#thread factory for nettythreadFactory {bossThreadPrefix = "NettyBoss"workerThreadPrefix = "NettyServerNIOWorker"serverExecutorThread-prefix = "NettyServerBizHandler"shareBossWorker = falseclientSelectorThreadPrefix = "NettyClientSelector"clientSelectorThreadSize = 1clientWorkerThreadPrefix = "NettyClientWorkerThread"# netty boss thread sizebossThreadSize = 1#auto default pin or 8workerThreadSize = "default"}shutdown {# when destroy server, wait secondswait = 3}serialization = "seata"compressor = "none"
}
service {#transaction service group mappingvgroupMapping.demo-tx-default-group = "default"#only support when registry.type=file, please don't set multiple addressesdefault.grouplist = "192.168.8.133:8091"#degrade, current not supportenableDegrade = false#disable seatadisableGlobalTransaction = false
}client {rm {asyncCommitBufferLimit = 10000lock {retryInterval = 10retryTimes = 30retryPolicyBranchRollbackOnConflict = true}reportRetryCount = 5tableMetaCheckEnable = falsetableMetaCheckerInterval = 60000reportSuccessEnable = falsesagaBranchRegisterEnable = falsesagaJsonParser = "fastjson"sagaRetryPersistModeUpdate = falsesagaCompensatePersistModeUpdate = falsetccActionInterceptorOrder = -2147482648 #Ordered.HIGHEST_PRECEDENCE + 1000}tm {commitRetryCount = 5rollbackRetryCount = 5defaultGlobalTransactionTimeout = 60000degradeCheck = falsedegradeCheckPeriod = 2000degradeCheckAllowTimes = 10interceptorOrder = -2147482648 #Ordered.HIGHEST_PRECEDENCE + 1000}undo {dataValidation = trueonlyCareUpdateColumns = truelogSerialization = "kryo"logTable = "undo_log"compress {enable = true# allow zip, gzip, deflater, 7z, lz4, bzip2, zstd default is ziptype = zip# if rollback info size > threshold, then will be compress# allow k m g tthreshold = 64k}}loadBalance {type = "RandomLoadBalance"virtualNodes = 10}
}
log {exceptionRate = 100
}
tcc {fence {# tcc fence log table namelogTableName = tcc_fence_log# tcc fence log clean periodcleanPeriod = 1h}
}

4.编写Seata全局事务扫描器配置类SeataTransctionConfig：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import io.seata.spring.annotation.GlobalTransactionScanner;@Configuration
public class SeataTransctionConfig {@Beanpublic GlobalTransactionScanner globalTransactionScanner() {String txServiceGroup = "demo-tx-default-group";return new GlobalTransactionScanner(txServiceGroup);}}

注意：在file.conf中的service配置要和SeataTransctionConfig 中指定的txServiceGroup 一致

5. 由于AT模型是使用本地undo_log进行回滚，因此，我们每个事务所在的数据库中需要添加该表

在seata github中有样板，链接：https://github.com/seata/seata/tree/develop/srcipt/client/at/db

其中mysql.sql如下：

-- ----------------------------
-- Table structure for undo_log
-- ----------------------------
DROP TABLE IF EXISTS `undo_log`;
CREATE TABLE `undo_log`  (`branch_id` bigint NOT NULL COMMENT 'branch transaction id',`xid` varchar(128) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT 'global transaction id',`context` varchar(128) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT 'undo_log context,such as serialization',`rollback_info` longblob NOT NULL COMMENT 'rollback info',`log_status` int NOT NULL COMMENT '0:normal status,1:defense status',`log_created` datetime(6) NOT NULL COMMENT 'create datetime',`log_modified` datetime(6) NOT NULL COMMENT 'modify datetime',UNIQUE INDEX `ux_undo_log`(`xid`, `branch_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci COMMENT = 'AT transaction mode undo table' ROW_FORMAT = Dynamic;-- ----------------------------
-- Records of undo_log
-- ----------------------------