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alibaba seata服务端具体实现

作者：x_u_xiang

seata是来处理分布式服务之间互相调用的事务问题，本文重点给大家介绍alibaba-seata实现方法，文中通过实例代码给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下

seata是什么？

seata是来处理分布式服务之间互相调用的事务问题。

Seata术语

TC (Transaction Coordinator) - 事务协调者

维护全局和分支事务的状态，驱动全局事务提交或回滚。

TM (Transaction Manager) - 事务管理器

定义全局事务的范围：开始全局事务、提交或回滚全局事务。

RM (Resource Manager) - 资源管理器

管理分支事务处理的资源，与TC交谈以注册分支事务和报告分支事务的状态，并驱动分支事务提交或回滚。

seata中文文档：Seata 是什么

seata下载地址：https://github.com/seata/seata/releases

seata服务端具体实现

我下载的是1.3.0 

 解压后目录结构

 修改配置文件：registry.conf 注册信息。type默认是file，我要注册到nacos，修改nacos配置信息。

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"
 
  nacos {
    application = "seata-server"
    serverAddr = "127.0.0.1:3333"
    group = "SEATA_GROUP"
    namespace = ""
    cluster = "default"
    username = "nacos"
    password = "nacos"
  }
  eureka {
    serviceUrl = "http://localhost:8761/eureka"
    application = "default"
    weight = "1"
  }
  redis {
    serverAddr = "localhost:6379"
    db = 0
    password = ""
    cluster = "default"
    timeout = 0
  }
  zk {
    cluster = "default"
    serverAddr = "127.0.0.1:2181"
    sessionTimeout = 6000
    connectTimeout = 2000
    username = ""
    password = ""
  }
  consul {
    cluster = "default"
    serverAddr = "127.0.0.1:8500"
  }
  etcd3 {
    cluster = "default"
    serverAddr = "http://localhost:2379"
  }
  sofa {
    serverAddr = "127.0.0.1:9603"
    application = "default"
    region = "DEFAULT_ZONE"
    datacenter = "DefaultDataCenter"
    cluster = "default"
    group = "SEATA_GROUP"
    addressWaitTime = "3000"
  }
  file {
    name = "file.conf"
  }
}
 
config {
  # file、nacos 、apollo、zk、consul、etcd3
  type = "file"
 
  nacos {
    serverAddr = "127.0.0.1:8848"
    namespace = ""
    group = "SEATA_GROUP"
    username = ""
    password = ""
  }
  consul {
    serverAddr = "127.0.0.1:8500"
  }
  apollo {
    appId = "seata-server"
    apolloMeta = "http://192.168.1.204:8801"
    namespace = "application"
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    sessionTimeout = 6000
    connectTimeout = 2000
    username = ""
    password = ""
  }
  etcd3 {
    serverAddr = "http://localhost:2379"
  }
  file {
    name = "file.conf"
  }
}

file.conf配置数据库信息，这里我配置的是db。要新建数据库。添加四张表。

branch_table、global_table、lock_table、undo_log。1.3.0版本没有给我们sql。其它版本有sql写在下面

## transaction log store, only used in seata-server
store {
  ## store mode: file、db、redis
  mode = "db"
 
  ## file store property
  file {
    ## store location dir
    dir = "sessionStore"
    # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
    maxBranchSessionSize = 16384
    # globe session size , if exceeded throws exceptions
    maxGlobalSessionSize = 512
    # file buffer size , if exceeded allocate new buffer
    fileWriteBufferCacheSize = 16384
    # when recover batch read size
    sessionReloadReadSize = 100
    # async, sync
    flushDiskMode = async
  }
 
  ## database store property
  db {
    ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp)/HikariDataSource(hikari) etc.
    datasource = "druid"
    ## mysql/oracle/postgresql/h2/oceanbase etc.
    dbType = "mysql"
    driverClassName = "com.mysql.cj.jdbc.Driver"
    url = "jdbc:mysql://127.0.0.1:3306/seata?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8"
    user = "root"
    password = "123456"
    minConn = 5
    maxConn = 30
    globalTable = "global_table"
    branchTable = "branch_table"
    lockTable = "lock_table"
    queryLimit = 100
    maxWait = 5000
  }
 
  ## redis store property
  redis {
    host = "127.0.0.1"
    port = "6379"
    password = ""
    database = "0"
    minConn = 1
    maxConn = 10
    queryLimit = 100
  }
 
}

sql

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
 
-- ----------------------------
-- Table structure for branch_table
-- ----------------------------
DROP TABLE IF EXISTS `branch_table`;
CREATE TABLE `branch_table`  (
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `transaction_id` bigint(20) DEFAULT NULL,
  `resource_group_id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `resource_id` varchar(256) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `branch_type` varchar(8) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `status` tinyint(4) DEFAULT NULL,
  `client_id` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `application_data` varchar(2000) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `gmt_create` datetime(6) DEFAULT NULL,
  `gmt_modified` datetime(6) DEFAULT NULL,
  PRIMARY KEY (`branch_id`) USING BTREE,
  INDEX `idx_xid`(`xid`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
 
-- ----------------------------
-- Table structure for global_table
-- ----------------------------
DROP TABLE IF EXISTS `global_table`;
CREATE TABLE `global_table`  (
  `xid` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `transaction_id` bigint(20) DEFAULT NULL,
  `status` tinyint(4) NOT NULL,
  `application_id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `transaction_service_group` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `transaction_name` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `timeout` int(11) DEFAULT NULL,
  `begin_time` bigint(20) DEFAULT NULL,
  `application_data` varchar(2000) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `gmt_create` datetime(0) DEFAULT NULL,
  `gmt_modified` datetime(0) DEFAULT NULL,
  PRIMARY KEY (`xid`) USING BTREE,
  INDEX `idx_gmt_modified_status`(`gmt_modified`, `status`) USING BTREE,
  INDEX `idx_transaction_id`(`transaction_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
 
-- ----------------------------
-- Table structure for lock_table
-- ----------------------------
DROP TABLE IF EXISTS `lock_table`;
CREATE TABLE `lock_table`  (
  `row_key` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `xid` varchar(96) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `transaction_id` bigint(20) DEFAULT NULL,
  `branch_id` bigint(20) NOT NULL,
  `resource_id` varchar(256) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `table_name` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `pk` varchar(36) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `gmt_create` datetime(0) DEFAULT NULL,
  `gmt_modified` datetime(0) DEFAULT NULL,
  PRIMARY KEY (`row_key`) USING BTREE,
  INDEX `idx_branch_id`(`branch_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
 
-- ----------------------------
-- Table structure for undo_log
-- ----------------------------
DROP TABLE IF EXISTS `undo_log`;
CREATE TABLE `undo_log`  (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `context` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `rollback_info` longblob NOT NULL,
  `log_status` int(11) NOT NULL,
  `log_created` datetime(0) NOT NULL,
  `log_modified` datetime(0) NOT NULL,
  `ext` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE,
  UNIQUE INDEX `ux_undo_log`(`xid`, `branch_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
 
SET FOREIGN_KEY_CHECKS = 1;

启动你自己的nacos注册中心。

然后在bin目录下双击seata-server.bat文件启动。

查看nacos注册中心，发现有seata的服务，就表示成功了。

 seata客户端

pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <artifactId>spring-cloud-demo</artifactId>
        <groupId>com.xx.job</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
 
    <artifactId>seata-order-service2001</artifactId>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>com.xx.job</groupId>
            <artifactId>cloud-common</artifactId>
            <version>${project.version}</version>
        </dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <artifactId>spring-boot-starter-web</artifactId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <artifactId>spring-boot-starter-actuator</artifactId>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <groupId>io.seata</groupId>
            <artifactId>seata-all</artifactId>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>6</source>
                    <target>6</target>
                </configuration>
        </plugins>
    </build>
</project>

yml文件

server:
  port: 2001
 
spring:
  application:
    name: seata-order-service
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:3333
      config:
        file-extension: yml
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/order?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    username: root
    password: 123456
    type: com.alibaba.druid.pool.DruidDataSource
mybatis:
  type-aliases-package: com.xx.job.entity
  mapper-locations: classpath:mapper/*.xml
#====================================Seata Config===============================================
seata:
  enabled: true
  application-id: account-seata-example
  tx-service-group: account-service-seata-service-group # 事务群组（可以每个应用独立取名，也可以使用相同的名字）
  client:
    rm-report-success-enable: true
    rm-table-meta-check-enable: false # 自动刷新缓存中的表结构（默认false）
    rm-report-retry-count: 5 # 一阶段结果上报TC重试次数（默认5）
    rm-async-commit-buffer-limit: 10000 # 异步提交缓存队列长度（默认10000）
    rm:
      lock:
        lock-retry-internal: 10 # 校验或占用全局锁重试间隔（默认10ms）
        lock-retry-times: 30 # 校验或占用全局锁重试次数（默认30）
        lock-retry-policy-branch-rollback-on-conflict: true # 分支事务与其它全局回滚事务冲突时锁策略（优先释放本地锁让回滚成功）
    tm-commit-retry-count: 3 # 一阶段全局提交结果上报TC重试次数（默认1次，建议大于1）
    tm-rollback-retry-count: 3 # 一阶段全局回滚结果上报TC重试次数（默认1次，建议大于1）
    undo:
      undo-data-validation: true # 二阶段回滚镜像校验（默认true开启）
      undo-log-serialization: jackson # undo序列化方式（默认jackson）
      undo-log-table: undo_log  # 自定义undo表名（默认undo_log）
    log:
      exceptionRate: 100 # 日志异常输出概率（默认100）
    support:
      spring:
        datasource-autoproxy: true
  service:
    vgroup-mapping:
      my_test_tx_group: default # TC 集群（必须与seata-server保持一致）
    enable-degrade: false # 降级开关
    disable-global-transaction: false # 禁用全局事务（默认false）
    grouplist:
      default: 127.0.0.1:8091
  transport:
    shutdown:
      wait: 3
    thread-factory:
      boss-thread-prefix: NettyBoss
      worker-thread-prefix: NettyServerNIOWorker
      server-executor-thread-prefix: NettyServerBizHandler
      share-boss-worker: false
      client-selector-thread-prefix: NettyClientSelector
      client-selector-thread-size: 1
      client-worker-thread-prefix: NettyClientWorkerThread
    type: TCP
    server: NIO
    heartbeat: true
    serialization: seata
    compressor: none
    enable-client-batch-send-request: true # 客户端事务消息请求是否批量合并发送（默认true）
  registry:
    file:
      name: file.conf
    type: nacos
      server-addr: localhost:3333
      namespace:
      cluster: default
  config:

 业务代码需要加上两个注解，本地事物和分布式事物。

@Transactional@GlobalTransactional

package com.xx.job.seataorderservice2001.controller;
 
import com.xx.job.common.CommonResult;
import com.xx.job.entity.Account;
import com.xx.job.entity.Order;
import com.xx.job.entity.Storage;
import com.xx.job.seataorderservice2001.service.AccountService;
import com.xx.job.seataorderservice2001.service.OrderService;
import com.xx.job.seataorderservice2001.service.StorageSerivce;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@Slf4j
@RestController
public class OrderController {
    @Autowired
    private OrderService orderService;
    private AccountService accountService;
    private StorageSerivce storageSerivce;
    /**
     * 加订单 减余额 减库存
     * @param order
     * @return
     */
    @Transactional
    @GlobalTransactional
    @RequestMapping("/order/create")
    public CommonResult create(Order order){
        // 加订单
        orderService.create(order);
        // 减余额
        Account account = new Account();
        account.setUserId(order.getUserId());
        account.setMoney(80);
        accountService.update(account);
        // 减库存
        Storage storage = new Storage();
        storage.setCount(999);
        storage.setCommodityCode(order.getCommodityCode());
        storageSerivce.update(storage);
        return new CommonResult(200,"添加订单成功！");
    }
}

具体demo   gitee：spring-cloud-demo: spring-cloud-demo试例

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