分布式事务seata框架基本使用小结

1.依赖

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-alibaba-seata</artifactId>
    <version>2.0.0.RELEASE</version>
</dependency>
<dependency>
    <groupId>io.seata</groupId>
    <artifactId>seata-all</artifactId>
    <version>0.8.0</version>
</dependency>

2.配置

  1. registry.conf:配置注册中心和配置中心,默认是file。
  2. file.conf:seata工作规则信息
  3. DataSourceConfig:配置代理数据源实现分支事务,如果没有注入,事务无法成功回滚

2.1 registry.conf

该文件包含两部分配置:

  1. 注册中心
  2. 配置中心
    注册中心:
registry { # 注册中心配置
  # 可选项:file 、nacos 、eureka、redis、zk
  type = "nacos" # 指定nacos注册中心,默认是file。由于项目整体使用nacos,所以后续选择nacos

  nacos {
    serverAddr = "127.0.0.1:8848"
    namespace = "public"
    cluster = "default"
  }
  eureka {
    serviceUrl = "http://localhost:1001/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"
  }
}

配置中心

config { # 配置中心
  # 可选项:file、nacos 、apollo、zk
  type = "file" # 指向file配置中心,也可以指向nacos等其他注册中心

  nacos {
    serverAddr = "localhost"
    namespace = "public"
    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"   # 通过file.conf配置seata参数,指向第二个配置文件
  }
}

2.2 file.conf

该文件的命名取决于registry.conf配置中心的配置

由于registry.conf中配置的是

也就是说:file.conf文件名取决于registry的配置中心(config{...})配置,如果registry配置的配置中心不是file,可以没有改文件。
例如:如果配置中心是nacos,这是file.conf文件就不需要了,把file.conf文件内容交给nacos就可

*事务日志存储配置:

store {
  ## store mode: file、db
  mode = "file"  # 存储方式file、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 {
    driver_class = ""
    url = ""
    user = ""
    password = ""
  }
}

*当前微服务在seata服务器中注册的信息配置:

service {
  #vgroup->rgroup
  #必须和服务名一致:${spring.applicaiton.name}
  vgroup_mapping.${spring.application.name}-fescar-service-group = "default"
  #only support single node
  default.grouplist = "127.0.0.1:8091" #seata-server服务器地址,默认是8091
  #degrade current not support
  enableDegrade = false
  #disable
  disable = false
}

客户端相关工作的机制

client {
  async.commit.buffer.limit = 10000
  lock {
    retry.internal = 10
    retry.times = 30
  }
}

2.3 DataSourceConfig

每一个微服务原来自己的数据源都必须使用DataSourceProxy代理,这样seata才能掌控所有事务。

@Configuration
public class DataSourceConfig {

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DruidDataSource druidDataSource() {
        return new DruidDataSource();
    }

    /**
     * 需要将 DataSourceProxy 设置为主数据源,否则事务无法回滚
     *
     * @param druidDataSource The DruidDataSource
     * @return The default datasource
     */
    @Primary
    @Bean("dataSource")
    public DataSource dataSource(DruidDataSource druidDataSource) {
        return new DataSourceProxy(druidDataSource);
    }
}

3.注解

主业务方法添加全局事务:@GlobalTransactional

分支业务方法添加本地事务注解:@Transactional

猜你喜欢

转载自www.cnblogs.com/nyf828/p/12596578.html