项目地址
本文作者：FUNKYE(陈健斌),杭州某互联网公司主程。
前言
事务：事务是由一组操作构成的可靠的独立的工作单元，事务具备ACID的特性，即原子性、一致性、隔离性和持久性。
分布式事务:当一个操作牵涉到多个服务,多台数据库协力完成时(比如分表分库后,业务拆分),多个服务中，本地的Transaction已经无法应对这个情况了,为了保证数据一致性，就需要用到分布式事务。
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。
本文目的：现如今微服务越来越流行，而市面上的分布式事务的方案可谓不少，参差不齐，比较流行的以MQ代表的保证的是消息最终一致性的解决方案（消费确认，消息回查，消息补偿机制等），以及TX-LCN的LCN模式协调本地事务来保证事务统一提交或回滚（已经停止更新，对Dubbo2.7不兼容）。而MQ的分布式事务太过复杂，TX-LCN断更，这时候需要一个高效可靠及易上手的分布式事务解决方案，Seata脱颖而出，本文要介绍的就是如何快速搭建一个整合Seata的Demo项目，一起来吧！
准备工作
1.首先安装mysql,eclipse之类常用的工具,这不展开了.
2.访问seata下载中心地址我们使用的0.9.0版本
3.下载并解压seata-server
建库建表
1.首先我们链接mysql创建一个名为seata的数据库,然后运行一下建表sql,这个在seata-server的conf文件夹内的db_store.sql就是我的所需要使用的sql了.
/*
Navicat MySQL Data Transfer
Source Server : mysql
Source Server Version : 50721
Source Host : localhost:3306
Source Database : seata
Target Server Type : MYSQL
Target Server Version : 50721
File Encoding : 65001
Date: 2019-11-23 22:03:18
*/
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) NOT NULL,
`transaction_id` bigint(20) DEFAULT NULL,
`resource_group_id` varchar(32) DEFAULT NULL,
`resource_id` varchar(256) DEFAULT NULL,
`lock_key` varchar(128) DEFAULT NULL,
`branch_type` varchar(8) DEFAULT NULL,
`status` tinyint(4) DEFAULT NULL,
`client_id` varchar(64) DEFAULT NULL,
`application_data` varchar(2000) DEFAULT NULL,
`gmt_create` datetime DEFAULT NULL,
`gmt_modified` datetime DEFAULT NULL,
PRIMARY KEY (`branch_id`),
KEY `idx_xid` (`xid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
-- ----------------------------
-- Records of branch_table
-- ----------------------------
-- ----------------------------
-- Table structure for global_table
-- ----------------------------
DROP TABLE IF EXISTS `global_table`;
CREATE TABLE `global_table` (
`xid` varchar(128) NOT NULL,
`transaction_id` bigint(20) DEFAULT NULL,
`status` tinyint(4) NOT NULL,
`application_id` varchar(32) DEFAULT NULL,
`transaction_service_group` varchar(32) DEFAULT NULL,
`transaction_name` varchar(128) DEFAULT NULL,
`timeout` int(11) DEFAULT NULL,
`begin_time` bigint(20) DEFAULT NULL,
`application_data` varchar(2000) DEFAULT NULL,
`gmt_create` datetime DEFAULT NULL,
`gmt_modified` datetime DEFAULT NULL,
PRIMARY KEY (`xid`),
KEY `idx_gmt_modified_status` (`gmt_modified`,`status`),
KEY `idx_transaction_id` (`transaction_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
-- ----------------------------
-- Records of global_table
-- ----------------------------
-- ----------------------------
-- Table structure for lock_table
-- ----------------------------
DROP TABLE IF EXISTS `lock_table`;
CREATE TABLE `lock_table` (
`row_key` varchar(128) NOT NULL,
`xid` varchar(96) DEFAULT NULL,
`transaction_id` mediumtext,
`branch_id` mediumtext,
`resource_id` varchar(256) DEFAULT NULL,
`table_name` varchar(32) DEFAULT NULL,
`pk` varchar(36) DEFAULT NULL,
`gmt_create` datetime DEFAULT NULL,
`gmt_modified` datetime DEFAULT NULL,
PRIMARY KEY (`row_key`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
-- ----------------------------
-- Records of lock_table
-- ----------------------------
-- ----------------------------
-- 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) 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;
-- ----------------------------
-- Records of undo_log
2.运行完上面的seata所需要的数据库后,我们进行搭建我们所需要写的demo的库,创建一个名为test的数据库,然后执行以下sql代码:
/*
Navicat MySQL Data Transfer
Source Server : mysql
Source Server Version : 50721
Source Host : localhost:3306
Source Database : test
Target Server Type : MYSQL
Target Server Version : 50721
File Encoding : 65001
Date: 2019-11-23 22:03:24
*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for test
-- ----------------------------
DROP TABLE IF EXISTS `test`;
CREATE TABLE `test` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`one` varchar(255) DEFAULT NULL,
`two` varchar(255) DEFAULT NULL,
`createTime` datetime DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4;
-- ----------------------------
-- Records of test
-- ----------------------------
INSERT INTO `test` VALUES ('1', '1', '2', '2019-11-23 16:07:34');
-- ----------------------------
-- 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) 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 AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of undo_log
3.我们找到seata-server/conf 文件夹内的file编辑它:
4.再次找到其中的db配置方法块,更改方法如下图:
好了,可以到bin目录去./seata-server.bat 运行看看了
创建项目
首先我们使用的是eclipse,当然你也可以用idea之类的工具,详细请按下面步骤来运行
1.创建一个新的maven项目,并删除多余文件夹:
2.打开项目的pom.xml,加入以下依赖:
<properties>
<webVersion>3.1</webVersion>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<HikariCP.version>3.2.0</HikariCP.version>
<mybatis-plus-boot-starter.version>3.2.0</mybatis-plus-boot-starter.version>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.8.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-framework</artifactId>
<version>4.2.0</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>4.2.0</version>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-spring-boot-starter</artifactId>
<version>2.7.4.1</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.60</version>
</dependency>
<!-- <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId>
<version>7.0</version> <scope>provided</scope> </dependency> -->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.9.2</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.9.2</version>
</dependency>
<!-- mybatis-plus begin -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>${mybatis-plus-boot-starter.version}</version>
</dependency>
<!-- mybatis-plus end -->
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>io.seata</groupId>
<artifactId>seata-all</artifactId>
<version>0.9.0.1</version>
</dependency>
<!-- Zookeeper -->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.9</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- <dependency> <groupId>com.baomidou</groupId> <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
<version>2.5.4</version> </dependency> -->
<!-- <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-generator</artifactId>
<version>3.1.0</version> </dependency> -->
<!-- https://mvnrepository.com/artifact/org.freemarker/freemarker -->
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/druid-spring-boot-starter -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.20</version>
</dependency>
<!-- 加上这个才能辨认到log4j2.yml文件 -->
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-yaml</artifactId>
</dependency>
<dependency> <!-- 引入log4j2依赖 -->
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- <dependency> <groupId>org.scala-lang</groupId> <artifactId>scala-library</artifactId>
<version>2.11.0</version> </dependency> -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
3.再切换父项目为pom模式,还是pom 文件,切换为 overview ,做如图操作:
4.创建我们的demo子项目,test-service:
目录如下:
创建EmbeddedZooKeeper.java文件,跟 ProviderApplication.java,代码如下:
package org.test;
import java.io.File;
import java.lang.reflect.Method;
import java.util.Properties;
import java.util.UUID;
import org.apache.zookeeper.server.ServerConfig;
import org.apache.zookeeper.server.ZooKeeperServerMain;
import org.apache.zookeeper.server.quorum.QuorumPeerConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.SmartLifecycle;
import org.springframework.util.ErrorHandler;
import org.springframework.util.SocketUtils;
public class EmbeddedZooKeeper implements SmartLifecycle {
private static final Logger logger = LoggerFactory.getLogger(EmbeddedZooKeeper.class);
private final int clientPort;
private boolean autoStartup = true;
private int phase = 0;
private volatile Thread zkServerThread;
private volatile ZooKeeperServerMain zkServer;
private ErrorHandler errorHandler;
private boolean daemon = true;
public EmbeddedZooKeeper() {
clientPort = SocketUtils.findAvailableTcpPort();
}
public EmbeddedZooKeeper(int clientPort, boolean daemon) {
this.clientPort = clientPort;
this.daemon = daemon;
}
public int getClientPort() {
return this.clientPort;
}
public void setAutoStartup(boolean autoStartup) {
this.autoStartup = autoStartup;
}
public boolean isAutoStartup() {
return this.autoStartup;
}
public void setPhase(int phase) {
this.phase = phase;
}
public int getPhase() {
return this.phase;
}
public boolean isRunning() {
return (zkServerThread != null);
}
public synchronized void start() {
if (zkServerThread == null) {
zkServerThread = new Thread(new ServerRunnable(), "ZooKeeper Server Starter");
zkServerThread.setDaemon(daemon);
zkServerThread.start();
}
}
public synchronized void stop() {
if (zkServerThread != null) {
try {
Method shutdown = ZooKeeperServerMain.class.getDeclaredMethod("shutdown");
shutdown.setAccessible(true);
shutdown.invoke(zkServer);
}
catch (Exception e) {
throw new RuntimeException(e);
}
try {
zkServerThread.join(5000);
zkServerThread = null;
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
logger.warn("Interrupted while waiting for embedded ZooKeeper to exit");
zkServerThread = null;
}
}
}
public void stop(Runnable callback) {
stop();
callback.run();
}
public void setErrorHandler(ErrorHandler errorHandler) {
this.errorHandler = errorHandler;
}
private class ServerRunnable implements Runnable {
public void run() {
try {
Properties properties = new Properties();
File file = new File(System.getProperty("java.io.tmpdir") + File.separator + UUID.randomUUID());
file.deleteOnExit();
properties.setProperty("dataDir", file.getAbsolutePath());
properties.setProperty("clientPort", String.valueOf(clientPort));
QuorumPeerConfig quorumPeerConfig = new QuorumPeerConfig();
quorumPeerConfig.parseProperties(properties);
zkServer = new ZooKeeperServerMain();
ServerConfig configuration = new ServerConfig();
configuration.readFrom(quorumPeerConfig);
zkServer.runFromConfig(configuration);
} catch (Exception e) {
if (errorHandler != null) {
errorHandler.handleError(e);
} else {
logger.error("Exception running embedded ZooKeeper", e);
}
}
}
}
}
package org.test;
import org.apache.dubbo.config.spring.context.annotation.DubboComponentScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.transaction.annotation.EnableTransactionManagement;
@EnableTransactionManagement
@ComponentScan(basePackages = {"org.test.config", "org.test.service.impl"})
@DubboComponentScan(basePackages = "org.test.service.impl")
@SpringBootApplication
public class ProviderApplication {
public static void main(String[] args) {
new EmbeddedZooKeeper(2181, false).start();
SpringApplication app = new SpringApplication(ProviderApplication.class);
app.run(args);
}
}
创建实体包 org.test.entity以及创建实体类Test 用到了lombok,详细百度一下,eclipse装lombok插件
package org.test.entity;
import java.io.Serializable;
import java.time.LocalDateTime;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@ApiModel(value = "test对象", description = "功能")
public class Test implements Serializable {
private static final long serialVersionUID = 1L;
@ApiModelProperty(value = "主键")
@TableId(value = "id", type = IdType.AUTO)
private Integer id;
@ApiModelProperty(value = "one")
@TableField("one")
private String one;
@ApiModelProperty(value = "two")
@TableField("two")
private String two;
@ApiModelProperty(value = "createTime")
@TableField("createTime")
private LocalDateTime createTime;
}
创建service,service.impl,mapper等包,依次创建ITestservice,以及实现类,mapper
package org.test.service;
import org.test.entity.Test;
import com.baomidou.mybatisplus.extension.service.IService;
public interface ITestService extends IService<Test> {
}
package org.test.service.impl;
import org.apache.dubbo.config.annotation.Service;
import org.test.entity.Test;
import org.test.mapper.TestMapper;
import org.test.service.ITestService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
@Service(version = "1.0.0",interfaceClass =ITestService.class )
public class TestServiceImpl extends ServiceImpl<TestMapper, Test> implements ITestService {
}
package org.test.mapper;
import org.test.entity.Test;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
public interface TestMapper extends BaseMapper<Test> {
}
创建org.test.config包,创建SeataAutoConfig.java,配置信息都在此处,主要作用为代理数据,连接事务服务分组
package org.test.config;
import javax.sql.DataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import com.alibaba.druid.pool.DruidDataSource;
import io.seata.rm.datasource.DataSourceProxy;
import io.seata.spring.annotation.GlobalTransactionScanner;
@Configuration
public class SeataAutoConfig {
@Autowired(required = true)
private DataSourceProperties dataSourceProperties;
private final static Logger logger = LoggerFactory.getLogger(SeataAutoConfig.class);
@Bean(name = "druidDataSource")
public DataSource druidDataSource() {
DruidDataSource druidDataSource = new DruidDataSource();
logger.info("dataSourceProperties.getUrl():{}", dataSourceProperties.getUrl());
druidDataSource.setUrl(dataSourceProperties.getUrl());
druidDataSource.setUsername(dataSourceProperties.getUsername());
druidDataSource.setPassword(dataSourceProperties.getPassword());
druidDataSource.setDriverClassName(dataSourceProperties.getDriverClassName());
druidDataSource.setInitialSize(0);
druidDataSource.setMaxActive(180);
druidDataSource.setMaxWait(60000);
druidDataSource.setMinIdle(0);
druidDataSource.setValidationQuery("Select 1 from DUAL");
druidDataSource.setTestOnBorrow(false);
druidDataSource.setTestOnReturn(false);
druidDataSource.setTestWhileIdle(true);
druidDataSource.setTimeBetweenEvictionRunsMillis(60000);
druidDataSource.setMinEvictableIdleTimeMillis(25200000);
druidDataSource.setRemoveAbandoned(true);
druidDataSource.setRemoveAbandonedTimeout(1800);
druidDataSource.setLogAbandoned(true);
logger.info("装载dataSource........");
return druidDataSource;
}
@Bean(name = "dataSource")
@Primary
public DataSourceProxy dataSourceProxy(@Qualifier(value = "druidDataSource") DruidDataSource druidDataSource) {
logger.info("代理dataSource........");
return new DataSourceProxy(druidDataSource);
}
@Bean
public GlobalTransactionScanner globalTransactionScanner() {
logger.info("配置seata........");
return new GlobalTransactionScanner("test-service", "test-group");
}
}
再创建mybatisplus所需的配置文件MybatisPlusConfig
package org.test.config;
import java.util.ArrayList;
import java.util.List;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.baomidou.mybatisplus.core.parser.ISqlParser;
import com.baomidou.mybatisplus.extension.parsers.BlockAttackSqlParser;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
@Configuration
public class MybatisPlusConfig {
@Bean
public PaginationInterceptor paginationInterceptor() {
PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
List<ISqlParser> sqlParserList = new ArrayList<ISqlParser>();
sqlParserList.add(new BlockAttackSqlParser());
paginationInterceptor.setSqlParserList(sqlParserList);
return paginationInterceptor;
}
@Bean
public MapperScannerConfigurer mapperScannerConfigurer() {
MapperScannerConfigurer scannerConfigurer = new MapperScannerConfigurer();
scannerConfigurer.setBasePackage("org.test.mapper");
return scannerConfigurer;
}
}
再创建resources目录,创建mapper文件夹,application.yml等文件
server:
port: 38888
spring:
application:
name: test-service
datasource:
type: com.alibaba.druid.pool.DruidDataSource
url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
driver-class-name: com.mysql.cj.jdbc.Driver
username: root
password: 123456
dubbo:
protocol:
loadbalance: leastactive
threadpool: cached
scan:
base-packages: org。test.service
application:
qos-enable: false
name: testserver
registry:
id: my-registry
address: zookeeper://127.0.0.1:2181?client=curator
mybatis-plus:
mapper-locations: classpath:/mapper/*Mapper.xml
typeAliasesPackage: org.test.entity
global-config:
db-config:
field-strategy: not-empty
id-type: auto
db-type: mysql
configuration:
map-underscore-to-camel-case: true
cache-enabled: true
auto-mapping-unknown-column-behavior: none
创建file.conf,此处的service 内的vgroup_mapping.你的事务分组,比如上面SeataAutoConfig内配置了test-group,那么这里也要改为test-group,然后下面ip端口都是seata运行的ip跟端口就行了
transport {
type = "TCP"
server = "NIO"
heartbeat = true
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"
boss-thread-size = 1
worker-thread-size = 8
}
shutdown {
wait = 3
}
serialization = "seata"
compressor = "none"
}
service {
vgroup_mapping.test-group = "default"
default.grouplist = "127.0.0.1:8091"
enableDegrade = false
disable = false
max.commit.retry.timeout = "-1"
max.rollback.retry.timeout = "-1"
}
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
undo.log.table = "undo_log"
}
recovery {
committing-retry-period = 1000
asyn-committing-retry-period = 1000
rollbacking-retry-period = 1000
timeout-retry-period = 1000
}
transaction {
undo.data.validation = true
undo.log.serialization = "jackson"
undo.log.save.days = 7
undo.log.delete.period = 86400000
undo.log.table = "undo_log"
}
metrics {
enabled = false
registry-type = "compact"
exporter-list = "prometheus"
exporter-prometheus-port = 9898
}
support {
spring {
datasource.autoproxy = false
}
}
创建registry.conf,来指定file,zk的ip端口之类的配置
registry {
type = "file"
file {
name = "file.conf"
}
}
config {
type = "file"
file {
name = "file.conf"
}
zk {
serverAddr = "127.0.0.1:2181"
session.timeout = 6000
connect.timeout = 2000
}
}
大功告成,可以直接运行啦,这时候观察seata-server
接下来我们创建test-client项目项目,这里就不赘述了,跟上面的test-service一样的创建方式
接下来我们复制test-service内的service跟实体过去,当然你嫌麻烦,可以单独搞个子项目放通用的service跟实体,一些工具类等等,我这边为了快速搭建这个demo,就选择复制黏贴的方式了.
目录结构:
然后我们创建ClientApplication:
package org.test;
import java.util.TimeZone;
import java.util.concurrent.Executor;
import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration;
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class, MybatisPlusAutoConfiguration.class})
@EnableScheduling
@EnableAsync
@Configuration
@EnableDubbo(scanBasePackages = {"org.test.service"})
@ComponentScan(basePackages = {"org.test.service", "org.test.controller", "org.test.config"})
public class ClientApplication {
public static void main(String[] args) {
TimeZone.setDefault(TimeZone.getTimeZone("Asia/Shanghai"));
SpringApplication app = new SpringApplication(ClientApplication.class);
app.run(args);
}
@Bean(name = "threadPoolTaskExecutor")
public Executor threadPoolTaskExecutor() {
return new ThreadPoolTaskExecutor();
}
}
再到config包内创建SwaggerConfig :
package org.test.config;
import java.util.ArrayList;
import java.util.List;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.service.Parameter;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
@Configuration
@EnableSwagger2
public class SwaggerConfig {
@Bean
public Docket createRestApi() {
List<Parameter> pars = new ArrayList<Parameter>();
return new Docket(DocumentationType.SWAGGER_2).apiInfo(apiInfo()).select()
.apis(RequestHandlerSelectors.basePackage("org.test.controller")).paths(PathSelectors.any()).build()
.globalOperationParameters(pars);
}
private ApiInfo apiInfo() {
return new ApiInfoBuilder()
.title("项目接口")
.contact(new Contact("FUNKYE", "", ""))
.version("1.0")
.description("API 描述").build();
}
}
再创建SpringMvcConfigure,再里面放入seata的配置,我为了偷懒直接集成在mvc配置的类里了,大家规范点可以另外创建个配置seata的类,大 家可以发现下面还是有个组名称,我把两个项目都分配到一个组去,貌似另外取一个也没事的.
package org.test.config;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import com.google.common.collect.Maps;
import io.seata.spring.annotation.GlobalTransactionScanner;
@Configuration
public class SpringMvcConfigure implements WebMvcConfigurer {
@Bean
public FilterRegistrationBean corsFilter() {
UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
CorsConfiguration config = new CorsConfiguration();
config.setAllowCredentials(true);
config.addAllowedOrigin("*");
config.addAllowedHeader(CorsConfiguration.ALL);
config.addAllowedMethod(CorsConfiguration.ALL);
source.registerCorsConfiguration("/**", config);
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new CorsFilter(source));
filterRegistrationBean.setOrder(Ordered.HIGHEST_PRECEDENCE);
filterRegistrationBean.setOrder(1);
filterRegistrationBean.setEnabled(true);
filterRegistrationBean.addUrlPatterns("/**");
Map<String, String> initParameters = Maps.newHashMap();
initParameters.put("excludes", "/favicon.ico,/img/*,/js/*,/css/*");
initParameters.put("isIncludeRichText", "true");
filterRegistrationBean.setInitParameters(initParameters);
return filterRegistrationBean;
}
@Bean
public InternalResourceViewResolver viewResolver() {
InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setPrefix("/WEB-INF/jsp/");
viewResolver.setSuffix(".jsp");
return viewResolver;
}
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
FastJsonConfig fastJsonConfig = new FastJsonConfig();
fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat, SerializerFeature.WriteMapNullValue,
SerializerFeature.WriteNullStringAsEmpty, SerializerFeature.DisableCircularReferenceDetect);
List<MediaType> fastMediaTypes = new ArrayList<>();
fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
fastConverter.setSupportedMediaTypes(fastMediaTypes);
fastConverter.setFastJsonConfig(fastJsonConfig);
StringHttpMessageConverter smc = new StringHttpMessageConverter(Charset.forName("UTF-8"));
converters.add(smc);
converters.add(fastConverter);
}
@Bean
public GlobalTransactionScanner globalTransactionScanner() {
return new GlobalTransactionScanner("test-client", "test-group");
}
}
再创建controller包,再包下创建TestController :
package org.test.controller;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Lazy;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.test.service.DemoService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
@RestController
@RequestMapping("/test")
@Api(tags = "测试接口")
public class TestController {
private final static Logger logger = LoggerFactory.getLogger(TestController.class);
@Autowired
@Lazy
DemoService demoService;
@GetMapping(value = "testSeataOne")
@ApiOperation(value = "测试手动回滚分布式事务接口")
public Object testSeataOne() {
return demoService.One();
}
@GetMapping(value = "testSeataTwo")
@ApiOperation(value = "测试异常回滚分布式事务接口")
public Object testSeataTwo() {
return demoService.Two();
}
}
再到service去创建需要依赖的DemoService
package org.test.service;
import java.time.LocalDateTime;
import org.apache.dubbo.config.annotation.Reference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.test.controller.TestController;
import org.test.entity.Test;
import io.seata.core.context.RootContext;
import io.seata.core.exception.TransactionException;
import io.seata.spring.annotation.GlobalTransactional;
import io.seata.tm.api.GlobalTransactionContext;
@Service
public class DemoService {
@Reference(version = "1.0.0", timeout = 60000)
private ITestService testService;
private final static Logger logger = LoggerFactory.getLogger(DemoService.class);
@GlobalTransactional
public Object One() {
logger.info("seata分布式事务Id:{}", RootContext.getXID());
Test t = new Test();
t.setOne("1");
t.setTwo("2");
t.setCreateTime(LocalDateTime.now());
testService.save(t);
try {
int i = 1 / 0;
return true;
} catch (Exception e) {
try {
logger.info("载入事务id进行回滚");
GlobalTransactionContext.reload(RootContext.getXID()).rollback();
} catch (TransactionException e1) {
e1.printStackTrace();
}
}
return false;
}
@GlobalTransactional
public Object Two() {
logger.info("seata分布式事务Id:{}", RootContext.getXID());
Test t = new Test();
t.setOne("1");
t.setTwo("2");
t.setCreateTime(LocalDateTime.now());
testService.save(t);
try {
int i = 1 / 0;
return true;
} catch (Exception e) {
throw new RuntimeException();
}
}
}
一样创建resources文件夹,先创建常用的application.yml
spring:
application:
name: test
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/test?userSSL=true&useUnicode=true&characterEncoding=UTF8&serverTimezone=Asia/Shanghai
username: root
password: 123456
mvc:
servlet:
load-on-startup: 1
http:
encoding:
force: true
charset: utf-8
enabled: true
multipart:
max-file-size: 10MB
max-request-size: 10MB
dubbo:
registry:
id: my-registry
address: zookeeper://127.0.0.1:2181?client=curator
# address: zookeeper://127.0.0.1:2181?client=curator
application:
name: dubbo-demo-client
qos-enable: false
server:
port: 28888
max-http-header-size: 8192
address: 0.0.0.0
tomcat:
max-http-post-size: 104857600
再把之前service配置好的file跟registry文件复制来,如果你的client组名称再配置类里修改了,那么这里的file文件内的组名称一样需要更改.
完整的目录结构如上,这时候可以启动test-service后,再启动test-client,到swagger里测试咯
4.访问127.0.0.1:28888/swagger-ui.html做最后的收尾 
这里数据我已经存了一条记录了,我们看看会不会成功回滚:
刷新数据库,发现还是只有一条数据:
再查看日志:
显示已经回滚,我们再看看seata-server的日志:
显示回滚成功,事务id也是一致的,这下我们的分布式事务就跑通咯,通过打断点方式,大家可以查看undo_log,会发现再事务提交前,会存入一条事务信息的数据,如果回滚成功,该信息就会被删除.
总结
seata的整合还是比较简单易入手,稍微用心一些你肯定写的比我更好!
欢迎大家也多去阅读seata,dubbo之类的源代码,能解决业务中遇到的大量的坑哦!
从对外暴露的角度看 AbstractExceptionHandler 定义了一个带有异常处理的模板方法，模板中有四个行为，在不同的情况下执行，其中三种行为已经实现，执行的行为交由子类自行实现，详解：
