一次业务操作需要跨多个数据源或需要跨多个系统进行远程调用,就会产生分布式事务问题
所以要用到新的
Seata是一款开源的分布式事务解决方案,致力于在微服务架构下提供高性能和简单易用的分布式事务服务
Seata是分布式事务处理过程的-ID+三组件模型
Transaction ID XID 全局唯一的事务ID
Transaction Coordinator(TC) | 事务协调器,维护全局事务的运行状态,负责协调并驱动全局事务的提交或回滚; |
Transaction Manager(TM) | 控制全局事务的边界,负责开启一个全局事务,并最终发起全局提交或全局回滚的决议; |
Resource Manager(RM) | 控制分支事务,负责分支注册,状态汇报,并接收事务协调器的指令,驱动分支(本地)事务的提交和回滚; |
处理过程
粗略用法 。类似于Spring 本地@Transactional,这个是全局@GlobalTransactional
下载,这里下载的是0.9版本
1.seata-server-0.9.0.zip解压到指定目录并修改conf目录下的file.conf配置文件
先备份原始file.conf文件,主要修改:自定义事务组名称+事务日志存储模式为db+数据库连接信息
file.conf:
然后建表,建表 sql在conf文件夹里有
修改seata-server-0.9.0\seata\conf目录下的registry.conf配置文件,我们要配合nacos注册中心使用
测试下配置文件有没有问题,先启动 8848nacos,然后启动bin文件夹里的 seata-server.bat
效果。Seata没启动报错no available server to connect
也可以看nacos
seata_order: 存储订单的数据库
CREATE TABLE t_order(
`id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
`user_id` BIGINT(11) DEFAULT NULL COMMENT '用户id',
`product_id` BIGINT(11) DEFAULT NULL COMMENT '产品id',
`count` INT(11) DEFAULT NULL COMMENT '数量',
`money` DECIMAL(11,0) DEFAULT NULL COMMENT '金额',
`status` INT(1) DEFAULT NULL COMMENT '订单状态:0:创建中; 1:已完结'
) ENGINE=INNODB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;
SELECT * FROM t_order;
seata_storage:存储库存的数据库
CREATE TABLE t_storage(
`id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,
`product_id` BIGINT(11) DEFAULT NULL COMMENT '产品id',
`total` INT(11) DEFAULT NULL COMMENT '总库存',
`used` INT(11) DEFAULT NULL COMMENT '已用库存',
`residue` INT(11) DEFAULT NULL COMMENT '剩余库存'
) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
INSERT INTO seata_storage.t_storage(`id`,`product_id`,`total`,`used`,`residue`)
VALUES('1','1','100','0','100');
SELECT * FROM t_storage;
seata_account: 存储账户信息的数据库
CREATE TABLE t_account(
`id` BIGINT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'id',
`user_id` BIGINT(11) DEFAULT NULL COMMENT '用户id',
`total` DECIMAL(10,0) DEFAULT NULL COMMENT '总额度',
`used` DECIMAL(10,0) DEFAULT NULL COMMENT '已用余额',
`residue` DECIMAL(10,0) DEFAULT '0' COMMENT '剩余可用额度'
) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
INSERT INTO seata_account.t_account(`id`,`user_id`,`total`,`used`,`residue`) VALUES('1','1','1000','0','1000')
SELECT * FROM t_account;
按照上述3库分别建对应的回滚日志表,订单-库存-账户3个库下都需要建各自的回滚日志表
\seata-server-0.9.0\seata\conf目录下的db_undo_log.sql
效果
新建订单Order-Module,模块名seata-order-service2001
pom。这里要 注册进nacos,还要用到 seata的0.9版本,所以排除之前自带的。最后微服务调用是用的openfeign
cloud2020
com.atguigu.springcloud
1.0-SNAPSHOT
4.0.0
seata-order-service2001
com.alibaba.cloud
spring-cloud-starter-alibaba-nacos-discovery
com.alibaba.cloud
spring-cloud-starter-alibaba-seata
seata-all
io.seata
io.seata
seata-all
0.9.0
org.springframework.cloud
spring-cloud-starter-openfeign
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-actuator
mysql
mysql-connector-java
5.1.37
com.alibaba
druid-spring-boot-starter
1.1.10
org.mybatis.spring.boot
mybatis-spring-boot-starter
2.0.0
org.springframework.boot
spring-boot-starter-test
test
org.projectlombok
lombok
true
resource 下的application.yml
server:
port: 2001
spring:
application:
name: seata-order-service
cloud:
alibaba:
seata:
#自定义事务组名称需要与seata-server中的对应
tx-service-group: fsp_tx_group
nacos:
discovery:
server-addr: localhost:8848
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/seata_order
username: root
password: root
feign:
hystrix:
enabled: false
logging:
level:
io:
seata: info
mybatis:
mapperLocations: classpath:mapper/*.xml
resource 下的 file.conf
这里注意的是 : vgroup_mapping.fsp_tx_group = "default" 以及数据库的账号密码
transport {
# tcp udt unix-domain-socket
type = "TCP"
#NIO NATIVE
server = "NIO"
#enable heartbeat
heartbeat = true
#thread factory for netty
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"
# netty boss thread size,will not be used for UDT
boss-thread-size = 1
#auto default pin or 8
worker-thread-size = 8
}
shutdown {
# when destroy server, wait seconds
wait = 3
}
serialization = "seata"
compressor = "none"
}
service {
vgroup_mapping.fsp_tx_group = "default" #修改自定义事务组名称
default.grouplist = "127.0.0.1:8091"
enableDegrade = false
disable = false
max.commit.retry.timeout = "-1"
max.rollback.retry.timeout = "-1"
disableGlobalTransaction = false
}
client {
async.commit.buffer.limit = 10000
lock {
retry.internal = 10
retry.times = 30
}
report.retry.count = 5
tm.commit.retry.count = 1
tm.rollback.retry.count = 1
}
## transaction log store
store {
## store mode: file、db
mode = "db"
## file store
file {
dir = "sessionStore"
# branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
max-branch-session-size = 16384
# globe session size , if exceeded throws exceptions
max-global-session-size = 512
# file buffer size , if exceeded allocate new buffer
file-write-buffer-cache-size = 16384
# when recover batch read size
session.reload.read_size = 100
# async, sync
flush-disk-mode = async
}
## database store
db {
## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc.
datasource = "dbcp"
## mysql/oracle/h2/oceanbase etc.
db-type = "mysql"
driver-class-name = "com.mysql.jdbc.Driver"
url = "jdbc:mysql://127.0.0.1:3306/seata"
user = "root"
password = "root"
min-conn = 1
max-conn = 3
global.table = "global_table"
branch.table = "branch_table"
lock-table = "lock_table"
query-limit = 100
}
}
lock {
## the lock store mode: local、remote
mode = "remote"
local {
## store locks in user's database
}
remote {
## store locks in the seata's server
}
}
recovery {
#schedule committing retry period in milliseconds
committing-retry-period = 1000
#schedule asyn committing retry period in milliseconds
asyn-committing-retry-period = 1000
#schedule rollbacking retry period in milliseconds
rollbacking-retry-period = 1000
#schedule timeout retry period in milliseconds
timeout-retry-period = 1000
}
transaction {
undo.data.validation = true
undo.log.serialization = "jackson"
undo.log.save.days = 7
#schedule delete expired undo_log in milliseconds
undo.log.delete.period = 86400000
undo.log.table = "undo_log"
}
## metrics settings
metrics {
enabled = false
registry-type = "compact"
# multi exporters use comma divided
exporter-list = "prometheus"
exporter-prometheus-port = 9898
}
support {
## spring
spring {
# auto proxy the DataSource bean
datasource.autoproxy = false
}
}
resource 下的 registry.conf。注册器。
这里主要改的是: type = "nacos"和 serverAddr = "localhost:8848"
registry {
# file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
type = "nacos"
nacos {
serverAddr = "localhost:8848"
namespace = ""
cluster = "default"
}
eureka {
serviceUrl = "http://localhost:8761/eureka"
application = "default"
weight = "1"
}
redis {
serverAddr = "localhost:6379"
db = "0"
}
zk {
cluster = "default"
serverAddr = "127.0.0.1:2181"
session.timeout = 6000
connect.timeout = 2000
}
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 = "localhost"
namespace = ""
}
consul {
serverAddr = "127.0.0.1:8500"
}
apollo {
app.id = "seata-server"
apollo.meta = "http://192.168.1.204:8801"
}
zk {
serverAddr = "127.0.0.1:2181"
session.timeout = 6000
connect.timeout = 2000
}
etcd3 {
serverAddr = "http://localhost:2379"
}
file {
name = "file.conf"
}
}
然后是实体类
CommonResult
package com.atguigu.springcloud.alibaba.domain;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* Created by IntelliJ IDEA.
* User: zhuangzibing
* Date: 2020/7/20
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult {
private Integer code;
private String message;
private T data;
public CommonResult(Integer code, String message) {
this(code,message,null);
}
}
Order
package com.atguigu.springcloud.alibaba.domain;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.math.BigDecimal;
/**
* Created by IntelliJ IDEA.
* User: zhuangzibing
* Date: 2020/7/20
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Order {
private Long id;
private Long userId;
private Long productId;
private Integer count;
private BigDecimal money;
private Integer status; //订单状态:0:创建中;1:已完结
}
然后是新建订单和修改订单状态的dao层
package com.atguigu.springcloud.alibaba.dao;
import com.atguigu.springcloud.alibaba.domain.Order;
import feign.Param;
import org.apache.ibatis.annotations.Mapper;
/**
* Created by IntelliJ IDEA.
* User: zhuangzibing
* Date: 2020/7/20
*/
@Mapper
public interface OrderDao {
//1 新建订单
void create(Order order);
//2 修改订单状态,从零改为1
void update(@Param("userId") Long userId, @Param("status") Integer status);
}
对应的mapper.xml
insert into t_order (id,user_id,product_id,count,money,status)
values (null,#{userId},#{productId},#{count},#{money},0);
update t_order set status = 1
where user_id=#{userId} and status = #{status};
然后是订单的service层和impl层
public interface OrderService {
void create(Order order);
}
package com.atguigu.springcloud.alibaba.service.impl;
import com.atguigu.springcloud.alibaba.dao.OrderDao;
import com.atguigu.springcloud.alibaba.domain.Order;
import com.atguigu.springcloud.alibaba.service.AccountService;
import com.atguigu.springcloud.alibaba.service.OrderService;
import com.atguigu.springcloud.alibaba.service.StorageService;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
/**
* Created by IntelliJ IDEA.
* User: zhuangzibing
* Date: 2020/7/20
*/
@Service
@Slf4j
public class OrderServiceImpl implements OrderService
{
@Resource
private OrderDao orderDao;
@Resource
private StorageService storageService;
@Resource
private AccountService accountService;
/**
* 创建订单->调用库存服务扣减库存->调用账户服务扣减账户余额->修改订单状态
* 简单说:下订单->扣库存->减余额->改状态
*/
@Override
@GlobalTransactional(name = "fsp-create-order",rollbackFor = Exception.class)
public void create(Order order)
{
log.info("----->开始新建订单");
//1 新建订单
orderDao.create(order);
//2 扣减库存
log.info("----->订单微服务开始调用库存,做扣减Count");
storageService.decrease(order.getProductId(),order.getCount());
log.info("----->订单微服务开始调用库存,做扣减end");
//3 扣减账户
log.info("----->订单微服务开始调用账户,做扣减Money");
accountService.decrease(order.getUserId(),order.getMoney());
log.info("----->订单微服务开始调用账户,做扣减end");
//4 修改订单状态,从零到1,1代表已经完成
log.info("----->修改订单状态开始");
orderDao.update(order.getUserId(),0);
log.info("----->修改订单状态结束");
log.info("----->下订单结束了,O(∩_∩)O哈哈~");
}
}
考虑到要调用微服务,所以还需要写库存和账号余额微服务调用接口
package com.atguigu.springcloud.alibaba.service;
import com.atguigu.springcloud.alibaba.domain.CommonResult;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import java.math.BigDecimal;
/**
* Created by IntelliJ IDEA.
* User: zhuangzibing
* Date: 2020/7/20
*/
@FeignClient(value = "seata-account-service")
public interface AccountService
{
@PostMapping(value = "/account/decrease")
CommonResult decrease(@RequestParam("userId") Long userId, @RequestParam("money") BigDecimal money);
}
package com.atguigu.springcloud.alibaba.service;
import com.atguigu.springcloud.alibaba.domain.CommonResult;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
/**
* Created by IntelliJ IDEA.
* User: zhuangzibing
* Date: 2020/7/20
*/
@FeignClient(value = "seata-storage-service")
public interface StorageService
{
@PostMapping(value = "/storage/decrease")
CommonResult decrease(@RequestParam("productId") Long productId, @RequestParam("count") Integer count);
}
控制层
package com.atguigu.springcloud.alibaba.controller;
import com.atguigu.springcloud.alibaba.domain.CommonResult;
import com.atguigu.springcloud.alibaba.domain.Order;
import com.atguigu.springcloud.alibaba.service.OrderService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
/**
* Created by IntelliJ IDEA.
* User: zhuangzibing
* Date: 2020/7/20
*/
@RestController
public class OrderController
{
@Resource
private OrderService orderService;
@GetMapping("/order/create")
public CommonResult create(Order order)
{
orderService.create(order);
return new CommonResult(200,"订单创建成功");
}
}
然后配置类MyBatisConfig.java和DataSourceProxyConfig.java
Seata 是通过代理数据源实现事务分支,所以需要配置 io.seata.rm.datasource.DataSourceProxy 的 Bean,且是 @Primary默认的数据源,否则事务不会回滚,无法实现分布式事务,数据源配置类
package com.atguigu.springcloud.alibaba.config;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;
/**
* Created by IntelliJ IDEA.
* User: zhuangzibing
* Date: 2020/7/20
*/
@Configuration
@MapperScan({"com.atguigu.springcloud.alibaba.dao"})
public class MyBatisConfig {
}
package com.atguigu.springcloud.alibaba.config;
import com.alibaba.druid.pool.DruidDataSource;
import io.seata.rm.datasource.DataSourceProxy;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import javax.sql.DataSource;
/**
* Created by IntelliJ IDEA.
* User: zhuangzibing
* Date: 2020/7/20
* 使用Seata对数据源进行代理
*/
@Configuration
public class DataSourceProxyConfig {
@Value("${mybatis.mapperLocations}")
private String mapperLocations;
@Bean
@ConfigurationProperties(prefix = "spring.datasource")
public DataSource druidDataSource(){
return new DruidDataSource();
}
@Bean
public DataSourceProxy dataSourceProxy(DataSource dataSource) {
return new DataSourceProxy(dataSource);
}
@Bean
public SqlSessionFactory sqlSessionFactoryBean(DataSourceProxy dataSourceProxy) throws Exception {
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
sqlSessionFactoryBean.setDataSource(dataSourceProxy);
sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations));
sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory());
return sqlSessionFactoryBean.getObject();
}
}
启动类。主要是第三个注解,排除默认的配置,用我们自己的配置
package com.atguigu.springcloud.alibaba;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
/**
* Created by IntelliJ IDEA.
* User: zhuangzibing
* Date: 2020/7/20
*/
@EnableDiscoveryClient
@EnableFeignClients
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)//取消数据源的自动创建
public class SeataOrderMainApp2001
{
public static void main(String[] args)
{
SpringApplication.run(SeataOrderMainApp2001.class, args);
}
}
2002库存模块和2003库存模块基本一致,为了文章阅读舒适,代码放到最后展示
接下来跑项目,启动nacos,seata,2001,2002,2003
启动url:http://localhost:2001/order/create?userId=1&productId=1&count=10&money=100
仔细观察错误提示的位置,是在最后一步,修改订单状态这里有问题
发现订单这里直接在dao层有个方法,于是去dao层看看
代码不复杂就一句
//2 修改订单状态,从零改为1
void update(@Param("userId") Long userId, @Param("status") Integer status);
那么就是 @Param参数没起作用
先看看导报,发现包是 import feign.Param; 原来是导错包,应该导 import org.apache.ibatis.annotations.Param;
顺便复习下Param的作用
https://blog.csdn.net/bailaoshi666/article/details/107481839
这里访问url成功
通过刚才的错误发现,如果没有回滚,数据库依旧有数据,但是订单没修改状态,这是不可取的,必须要全局回滚
或者在账户那里模拟异常。这里线程等待20秒,但是openfeign只有默认1秒等待,所以会报超时异常
/**
* 扣减账户余额
*/
@Override
public void decrease(Long userId, BigDecimal money) {
log.info("------->account-service中扣减账户余额开始");
//模拟超时异常,全局事务回滚
//暂停几秒钟线程
try { TimeUnit.SECONDS.sleep(20); } catch (InterruptedException e) { e.printStackTrace(); }
accountDao.decrease(userId,money);
log.info("------->account-service中扣减账户余额结束");
}
看数据库 ,订单状态没有修改为1,但是扣钱了,库存也少了
而且由于feign的重试机制,账户余额还有可能被多次扣减
回到业务初始的地方加全局回滚
@GlobalTransactional(name = "fsp-create-order",rollbackFor = Exception.class)
只需要这个注解就可以解决分布式的跨数据库的微服务的全局事务问题
TC就是 seata服务器
TM就是@GlobalTransactional标注的方法,事务的发起方
RM就是数据库,一个数据库就是一个RM,事务的参与方
打断点再跑一次
分布式事务的执行流程
AT模式如何做到对业务的无侵入
2002
pom
cloud2020
com.atguigu.springcloud
1.0-SNAPSHOT
4.0.0
seata-order-service2002
com.alibaba.cloud
spring-cloud-starter-alibaba-nacos-discovery
com.alibaba.cloud
spring-cloud-starter-alibaba-seata
seata-all
io.seata
io.seata
seata-all
0.9.0
org.springframework.cloud
spring-cloud-starter-openfeign
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-test
test
org.mybatis.spring.boot
mybatis-spring-boot-starter
2.0.0
mysql
mysql-connector-java
5.1.37
com.alibaba
druid-spring-boot-starter
1.1.10
org.projectlombok
lombok
true
application
server:
port: 2002
spring:
application:
name: seata-storage-service
cloud:
alibaba:
seata:
tx-service-group: fsp_tx_group
nacos:
discovery:
server-addr: localhost:8848
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/seata_storage
username: root
password: root
logging:
level:
io:
seata: info
mybatis:
mapperLocations: classpath:mapper/*.xml
resources/file.conf
transport {
# tcp udt unix-domain-socket
type = "TCP"
#NIO NATIVE
server = "NIO"
#enable heartbeat
heartbeat = true
#thread factory for netty
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"
# netty boss thread size,will not be used for UDT
boss-thread-size = 1
#auto default pin or 8
worker-thread-size = 8
}
shutdown {
# when destroy server, wait seconds
wait = 3
}
serialization = "seata"
compressor = "none"
}
service {
#vgroup->rgroup
vgroup_mapping.fsp_tx_group = "default"
#only support single node
default.grouplist = "127.0.0.1:8091"
#degrade current not support
enableDegrade = false
#disable
disable = false
#unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanent
max.commit.retry.timeout = "-1"
max.rollback.retry.timeout = "-1"
disableGlobalTransaction = false
}
client {
async.commit.buffer.limit = 10000
lock {
retry.internal = 10
retry.times = 30
}
report.retry.count = 5
tm.commit.retry.count = 1
tm.rollback.retry.count = 1
}
transaction {
undo.data.validation = true
undo.log.serialization = "jackson"
undo.log.save.days = 7
#schedule delete expired undo_log in milliseconds
undo.log.delete.period = 86400000
undo.log.table = "undo_log"
}
support {
## spring
spring {
# auto proxy the DataSource bean
datasource.autoproxy = false
}
}
resources/registry.conf
registry {
# file 、nacos 、eureka、redis、zk
type = "nacos"
nacos {
serverAddr = "localhost:8848"
namespace = ""
cluster = "default"
}
eureka {
serviceUrl = "http://localhost:8761/eureka"
application = "default"
weight = "1"
}
redis {
serverAddr = "localhost:6381"
db = "0"
}
zk {
cluster = "default"
serverAddr = "127.0.0.1:2181"
session.timeout = 6000
connect.timeout = 2000
}
file {
name = "file.conf"
}
}
config {
# file、nacos 、apollo、zk
type = "file"
nacos {
serverAddr = "localhost"
namespace = ""
cluster = "default"
}
apollo {
app.id = "fescar-server"
apollo.meta = "http://192.168.1.204:8801"
}
zk {
serverAddr = "127.0.0.1:2181"
session.timeout = 6000
connect.timeout = 2000
}
file {
name = "file.conf"
}
}
mapper下的StorageMapper.xml
UPDATE
t_storage
SET
used = used + #{count},residue = residue - #{count}
WHERE
product_id = #{productId}
启动类
package com.atguigu.springcloud.alibaba;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
/**
* Created by IntelliJ IDEA.
* User: zhuangzibing
* Date: 2020/7/20
*/
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
@EnableDiscoveryClient
@EnableFeignClients
public class SeataStorageServiceApplication2002 {
public static void main(String[] args)
{
SpringApplication.run(SeataStorageServiceApplication2002.class, args);
}
}
实体类 domain下的 CommonResult参照以上
实体类domain下的Storage
package com.atguigu.springcloud.alibaba.domain;
import lombok.Data;
@Data
public class Storage {
private Long id;
/**
* 产品id
*/
private Long productId;
/**
* 总库存
*/
private Integer total;
/**
* 已用库存
*/
private Integer used;
/**
* 剩余库存
*/
private Integer residue;
}
dao层
package com.atguigu.springcloud.alibaba.dao;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
@Mapper
public interface StorageDao {
//扣减库存
void decrease(@Param("productId") Long productId, @Param("count") Integer count);
}
service层
package com.atguigu.springcloud.alibaba.service;
public interface StorageService {
/**
* 扣减库存
*/
void decrease(Long productId, Integer count);
}
impl层
package com.atguigu.springcloud.alibaba.service.impl;
import com.atguigu.springcloud.alibaba.dao.StorageDao;
import com.atguigu.springcloud.alibaba.service.StorageService ;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service
@Slf4j
public class StorageServiceImpl implements StorageService {
@Resource
private StorageDao storageDao;
/**
* 扣减库存
*/
@Override
public void decrease(Long productId, Integer count) {
log.info("------->storage-service中扣减库存开始");
storageDao.decrease(productId,count);
log.info("------->storage-service中扣减库存结束");
}
}
控制器
package com.atguigu.springcloud.alibaba.controller;
import com.atguigu.springcloud.alibaba.domain.CommonResult ;
import com.atguigu.springcloud.alibaba.service.StorageService ;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class StorageController {
@Autowired
private StorageService storageService;
/**
* 扣减库存
*/
@RequestMapping("/storage/decrease")
public CommonResult decrease(Long productId, Integer count) {
storageService.decrease(productId, count);
return new CommonResult(200,"扣减库存成功!");
}
}
config下的配置类
package com.atguigu.springcloud.alibaba.config;
import com.alibaba.druid.pool.DruidDataSource;
import io.seata.rm.datasource.DataSourceProxy;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import javax.sql.DataSource;
/**
* @auther zzyy
* @create 2020-02-26 16:24
* 使用Seata对数据源进行代理
*/
@Configuration
public class DataSourceProxyConfig {
@Value("${mybatis.mapperLocations}")
private String mapperLocations;
@Bean
@ConfigurationProperties(prefix = "spring.datasource")
public DataSource druidDataSource(){
return new DruidDataSource();
}
@Bean
public DataSourceProxy dataSourceProxy(DataSource dataSource) {
return new DataSourceProxy(dataSource);
}
@Bean
public SqlSessionFactory sqlSessionFactoryBean(DataSourceProxy dataSourceProxy) throws Exception {
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
sqlSessionFactoryBean.setDataSource(dataSourceProxy);
sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(mapperLocations));
sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory());
return sqlSessionFactoryBean.getObject();
}
}
package com.atguigu.springcloud.alibaba.config;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;
/**
* @auther zzyy
* @create 2019-12-11 16:57
*/
@Configuration
@MapperScan({"com.atguigu.springcloud.alibaba.dao"})
public class MyBatisConfig {
}
启动类
package com.atguigu.springcloud.alibaba;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
/**
* Created by IntelliJ IDEA.
* User: zhuangzibing
* Date: 2020/7/20
*/
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
@EnableDiscoveryClient
@EnableFeignClients
public class SeataStorageServiceApplication2002 {
public static void main(String[] args)
{
SpringApplication.run(SeataStorageServiceApplication2002.class, args);
}
}
2003基本类似2002
pom一样就不放了,参考 2002
application
server:
port: 2003
spring:
application:
name: seata-account-service
cloud:
alibaba:
seata:
tx-service-group: fsp_tx_group
nacos:
discovery:
server-addr: localhost:8848
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/seata_account
username: root
password: root
feign:
hystrix:
enabled: false
logging:
level:
io:
seata: info
mybatis:
mapperLocations: classpath:mapper/*.xml
file.conf和registry.conf也和 2002一样
mapper.xml
UPDATE t_account
SET
residue = residue - #{money},used = used + #{money}
WHERE
user_id = #{userId};
实体类CommonResult参照2002
实体类 account
package com.atguigu.springcloud.alibaba.domain;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.math.BigDecimal;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Account {
private Long id;
/**
* 用户id
*/
private Long userId;
/**
* 总额度
*/
private BigDecimal total;
/**
* 已用额度
*/
private BigDecimal used;
/**
* 剩余额度
*/
private BigDecimal residue;
}
dao层
package com.atguigu.springcloud.alibaba.dao;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
import java.math.BigDecimal;
@Mapper
public interface AccountDao {
/**
* 扣减账户余额
*/
void decrease(@Param("userId") Long userId, @Param("money") BigDecimal money);
}
service层
package com.atguigu.springcloud.alibaba.service;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import java.math.BigDecimal;
public interface AccountService {
/**
* 扣减账户余额
* @param userId 用户id
* @param money 金额
*/
void decrease(@RequestParam("userId") Long userId, @RequestParam("money") BigDecimal money);
}
impl层
package com.atguigu.springcloud.alibaba.service.impl;
import com.atguigu.springcloud.alibaba.dao.AccountDao;
import com.atguigu.springcloud.alibaba.service.AccountService ;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.math.BigDecimal;
import java.util.concurrent.TimeUnit;
/**
* 账户业务实现类
* Created by zzyy on 2019/11/11.
*/
@Service
@Slf4j
public class AccountServiceImpl implements AccountService {
@Resource
AccountDao accountDao;
/**
* 扣减账户余额
*/
@Override
public void decrease(Long userId, BigDecimal money) {
log.info("------->account-service中扣减账户余额开始");
//模拟超时异常,全局事务回滚
//暂停几秒钟线程
/*try { TimeUnit.SECONDS.sleep(20); } catch (InterruptedException e) { e.printStackTrace(); }*/
accountDao.decrease(userId,money);
log.info("------->account-service中扣减账户余额结束");
}
}
控制器
package com.atguigu.springcloud.alibaba.controller;
import com.atguigu.springcloud.alibaba.domain.CommonResult ;
import com.atguigu.springcloud.alibaba.service.AccountService ;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import java.math.BigDecimal;
@RestController
public class AccountController {
@Resource
AccountService accountService;
/**
* 扣减账户余额
*/
@RequestMapping("/account/decrease")
public CommonResult decrease(@RequestParam("userId") Long userId, @RequestParam("money") BigDecimal money){
accountService.decrease(userId,money);
return new CommonResult(200,"扣减账户余额成功!");
}
}
两个配置类DataSourceProxyConfig和MyBatisConfig参考2002即可
启动类参考2002即可。配置结束,可以运行了。