SpringCloud下

阅读数: 次 2021-03-16

十四、SpringCloud Alibaba入门简介

1.why会出现SpringCloud alibaba

Spring Cloud Netflix项目进入维护模式

SpringCloud NetFlix Projects Entering Maintenance Mode

什么是维护模式

进入维护模式意味着什么呢？

2.SpringCloud alibaba带来了什么？

是什么

https://github.com/alibaba/spring-cloud-alibaba/blob/master/README-zh.md

能干嘛

去哪下

https://github.com/alibaba/spring-cloud-alibaba/blob/master/README-zh.md

怎么玩

Sentinel：把流量作为切入点，从流量控制、熔断降级、系统负载保护等多个维度保护服务的稳定性。

Nacos：一个更易于构建云原生应用的动态服务发现、配置管理和服务管理平台。

RocketMQ：一款开源的分布式消息系统，基于高可用分布式集群技术，提供低延时的、高可靠的消息发布与订阅服务。

Dubbo：Apache Dubbo™ 是一款高性能 Java RPC 框架。

Seata：阿里巴巴开源产品，一个易于使用的高性能微服务分布式事务解决方案。

Alibaba Cloud ACM：一款在分布式架构环境中对应用配置进行集中管理和推送的应用配置中心产品。

Alibaba Cloud OSS: 阿里云对象存储服务（Object Storage Service，简称 OSS），是阿里云提供的海量、安全、低成本、高可靠的云存储服务。您可以在任何应用、任何时间、任何地点存储和访问任意类型的数据。

Alibaba Cloud SchedulerX: 阿里中间件团队开发的一款分布式任务调度产品，提供秒级、精准、高可靠、高可用的定时（基于 Cron 表达式）任务调度服务。

Alibaba Cloud SMS: 覆盖全球的短信服务，友好、高效、智能的互联化通讯能力，帮助企业迅速搭建客户触达通道。

3.SpringCloud alibaba学习资料获取

十五、SpringCloud Alibaba Nacos服务注册和配置中心

1.Nacos简介

为什么叫Nacos

前四个字母分别为Naming和Configuration的前两个字母，最后的s为Service

是什么

一个更易于构建云原生应用的动态服务发现，配置管理和服务管理中心

Nacos：Dynamic Naming and Configuration Service

Nacos就是注册中心+配置中心的组合

Nacos = Eureka+Config+Bus

能干嘛

替代Eureka做服务注册中心

替代Config做服务配置中心

去哪下

https://github.com/alibaba/Nacos

官网文档

https://nacos.io/zh-cn/index.html

https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_spring_cloud_alibaba_nacos_discovery

各种注册中心比较

2.安装并运行Nacos

本地Java8+Maven环境已经OK
先从官网下载Nacos

https://github.com/alibaba/nacos/releases/tag/1.1.4
解压安装包，直接运行bin目录下的startup.cmd
命令运行成功后直接访问http://localhost:8848/nacos

默认账号密码都是nacos

3.Nacos作为服务注册中心演示

官网文档

https://spring.io/projects/spring-cloud-alibaba#lean

基于Nacos的服务提供者

新建Module cloudalibaba-provider-payment9001

父POM

<!--spring cloud alibaba 2.1.0.RELEASE-->
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-alibaba-dependencies</artifactId>
    <version>2.1.0.RELEASE</version>
    <type>pom</type>
    <scope>import</scope>
</dependency>

本模块POM

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud</artifactId>
        <groupId>com.ming</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-provider-payment9001</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency><dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.62</version>
    </dependency>
    </dependencies>



</project>

YML

server:
  port: 9001

spring:
  application:
    name: nacos-payment-provider
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 #配置Nacos地址

management:
  endpoints:
    web:
      exposure:
        include: '*'

主启动

@SpringBootApplication
@EnableDiscoveryClient
public class PaymentMain9001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain9001.class, args);
    }
}

业务类

@RestController
public class PaymentController {

    @Value("${server.port}")
    private String serverPort;

    @GetMapping(value = "/payment/nacos/{id}")
    public String getPayment(@PathVariable("id") Integer id) {
        return "nacos registry, serverPort: " + serverPort + "\t id" + id;
    }

}

测试
为了下一章节演示nacos的负载均衡，参照9001新建9002

新建cloudalibaba-provider-payment9002

9002其他步骤你懂的

或者取巧不想新建重复体力劳动，直接拷贝虚拟端口映射

基于Nacos的服务消费者

新建Module cloudalibaba-consumer-nacos-order83

POM

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud</artifactId>
        <groupId>com.ming</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-consumer-nacos-order83</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency><dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.62</version>
    </dependency>
    </dependencies>
</project>

为什么nacos支持负载均衡

YML

server:
  port: 83


spring:
  application:
    name: nacos-order-consumer
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848


service-url:
  nacos-user-service: http://nacos-payment-provider

主启动

@SpringBootApplication
@EnableDiscoveryClient
public class OrderNacosMain83 {
    public static void main(String[] args) {
        SpringApplication.run(OrderNacosMain83.class, args);
    }
}

业务类

package com.ming.springcloud.config;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class ApplicationContextConfig {

    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate()
    {
        return new RestTemplate();
    }
}

package com.ming.springcloud.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

@RestController
@Slf4j
public class OrderNacosController {
    @Resource
    private RestTemplate restTemplate;

    @Value("${service-url.nacos-user-service}")
    private String serverURL;

    @GetMapping(value = "/consumer/payment/nacos/{id}")
    public String paymentInfo(@PathVariable("id") Long id)
    {
        return restTemplate.getForObject(serverURL+"/payment/nacos/"+id,String.class);
    }
}

测试

83访问9001/9002，轮询负载OK

服务注册中心对比

Nacos全景图所示

Nacos和CAP

切换

Nacos支持AP和CP模式的切换

1	curl -X PUT '$NACOS_SERVER:8848/nacos/v1/ns/operator/switches?entry=serverMode&value=CP'

4.Nacos作为服务配置中心演示

Nacos作为配置中心-基础配置

cloudalibaba-config-nacos-client3377

POM

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud</artifactId>
        <groupId>com.ming</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-config-nacos-client3377</artifactId>

    <dependencies>
        <!--nacos-config-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
        <!--nacos-discovery-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--web + actuator-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--一般基础配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    
</project>

YML

bootstrap.yaml

server:
  port: 3377

spring:
  application:
    name: nacos-config-client
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 #服务注册中心地址
      config:
        server-addr: localhost:8848 #配置中心地址
        file-extension: yaml #指定yaml格式的配置

application.yaml

1
2
3

spring:
  profiles:
    active: dev

主启动

@SpringBootApplication
@EnableDiscoveryClient
public class NacosConfigClientMain3377 {
    public static void main(String[] args) {
        SpringApplication.run(NacosConfigClientMain3377.class, args);
    }
}

业务类

ConfigClientController

@RestController
@RefreshScope
public class ConfigClientController {

    @Value("${config.info}")
    private String configInfo;

    @GetMapping("/config/info")
    public String getConfigInfo() {
        return configInfo;
    }
}

@RefreshScope

在Nacos中添加配置信息

Nacos中的匹配规则

理论

Nacos中的dataid的组成格式与SpringBoot配置文件中的匹配规则

官网: https://nacos.io/zh-cn/docs/quick-start-spring-cloud.html

实操

1)配置新增

nacos-config-client-dev.yaml

2)Nacos界面配置对应

${spring.application.name}-${spring.profile.active}.${spring.cloud.nacos.config.file-extension}

prefix默认为spring.application.name的值

spring.profile.active既为当前环境对应的profile,可以通过配置项spring.profile.active 来配置

file-exetension为配置内容的数据格式，可以通过配置项spring.cloud.nacos.config.file-extension配置

说明:
测试

启动前需要在nacos客户端-配置管理-配置管理栏目下有没有对应的yaml配置文件

运行cloud-config-nacos-client3377的主启动类

调用接口查看配置信息 http://localhost:3377/config/info
自带动态刷新

修改下Nacos中的yaml配置文件，再次调用查看配置的接口，就会发现配置已经刷新

Nacos作为配置中心-分类配置

问题

多环境多项目管理

Nacos的图形化管理界面

配置管理

命名空间

Namespace+Group+Data ID三者关系？为什么这么设计？

Case

DataID方案

指定spring.profile.active和配置文件的DataID来使不同环境下读取不同的配置
默认空间+默认分组+新建dev和test两个DataID
通过spring.profile.active属性就能进行多环境下配置文件的读取
测试

http://localhost:3377/config/info

配置是什么就加载什么

Group方案

通过Group实现环境区分

新建Group
在nacos图形界面控制台上面新建配置文件DataID
bootstrap+application

在config下增加一条group的配置即可。可配置为DEV_GROUP或TEST_GROUP

Namespace方案

新建dev/test的Namespace
回到服务管理-服务列表查看
按照域名配置填写

YML

bootstrap

server:
  port: 3377

spring:
  application:
    name: nacos-config-client
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 #服务注册中心地址
      config:
        server-addr: localhost:8848 #配置中心地址
        file-extension: yaml #指定yaml格式的配置
        group: DEFAULT_GROUP
        namespace: e10f8478-efae-4915-b022-0cd1efcd11ec

application

spring:
  profiles:
#    active: dev
    active: test
#    active: info

5.Nacos集群和持久化配置（重要）

官网说明

https://nacos.io/zh-cn/docs/cluster-mode-quick-start.html

官网架构图（写的(┬＿┬)）

上图官网翻译，真实情况

说明

按照上述，我们需要mysql数据库

官网说明

https://nacos.io/zh-cn/docs/deployment.html

重点说明

Nacos持久化配置解释

Nacos默认自带的是嵌入式数据库derby

https://github.com/alibaba/nacos/blob/develop/config/pom.xml

derby到mysql切换配置步骤

nacos-server-1.1.4\nacos\conf目录下找到sql脚本

nacos-mysql.sql

执行脚本


CREATE DATABASE nacos_config;
USE nacos_config;

/*   数据库全名 = nacos_config   */
/*   表名称 = config_info   */
/******************************************/
CREATE TABLE `config_info` (
    `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
    `data_id` varchar(255) NOT NULL COMMENT    'data_id',
    `group_id` varchar(255) DEFAULT NULL,
    `content` longtext NOT NULL COMMENT 'content',
    `md5` varchar(32) DEFAULT NULL COMMENT 'md5',
    `gmt_create` datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '创建时间',
    `gmt_modified` datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '修改时间',
    `src_user` text COMMENT 'source user',
    `src_ip` varchar(20) DEFAULT NULL COMMENT 'source ip',
    `app_name` varchar(128) DEFAULT NULL,
    `tenant_id` varchar(128) DEFAULT '' COMMENT '租户字段',
    `c_desc` varchar(256) DEFAULT NULL,
    `c_use` varchar(64) DEFAULT NULL,
    `effect` varchar(64) DEFAULT NULL,
    `type` varchar(64) DEFAULT NULL,
    `c_schema` text,
    PRIMARY KEY (`id`),
    UNIQUE KEY `uk_configinfo_datagrouptenant` (`data_id`,`group_id`,`tenant_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='config_info';

/******************************************/
/*   数据库全名 = nacos_config   */
/*   表名称 = config_info_aggr   */
/******************************************/
CREATE TABLE `config_info_aggr` (
    `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
    `data_id` varchar(255) NOT NULL COMMENT 'data_id',
    `group_id` varchar(255) NOT NULL COMMENT 'group_id',
    `datum_id` varchar(255) NOT NULL COMMENT 'datum_id',
    `content` longtext NOT NULL COMMENT '内容',
    `gmt_modified` datetime NOT NULL COMMENT '修改时间',
    `app_name` varchar(128) DEFAULT NULL,
    `tenant_id` varchar(128) DEFAULT '' COMMENT '租户字段',
    PRIMARY KEY (`id`),
    UNIQUE KEY `uk_configinfoaggr_datagrouptenantdatum` (`data_id`,`group_id`,`tenant_id`,`datum_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='增加租户字段';


/******************************************/
/*   数据库全名 = nacos_config   */
/*   表名称 = config_info_beta   */
/******************************************/
CREATE TABLE `config_info_beta` (
    `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
    `data_id` varchar(255) NOT NULL COMMENT 'data_id',
    `group_id` varchar(128) NOT NULL COMMENT 'group_id',
    `app_name` varchar(128) DEFAULT NULL COMMENT 'app_name',
    `content` longtext NOT NULL COMMENT 'content',
    `beta_ips` varchar(1024) DEFAULT NULL COMMENT 'betaIps',
    `md5` varchar(32) DEFAULT NULL COMMENT 'md5',
    `gmt_create` datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '创建时间',
    `gmt_modified` datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '修改时间',
    `src_user` text COMMENT 'source user',
    `src_ip` varchar(20) DEFAULT NULL COMMENT 'source ip',
    `tenant_id` varchar(128) DEFAULT '' COMMENT '租户字段',
    PRIMARY KEY (`id`),
    UNIQUE KEY `uk_configinfobeta_datagrouptenant` (`data_id`,`group_id`,`tenant_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='config_info_beta';

/******************************************/
/*   数据库全名 = nacos_config   */
/*   表名称 = config_info_tag   */
/******************************************/
CREATE TABLE `config_info_tag` (
    `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
    `data_id` varchar(255) NOT NULL COMMENT 'data_id',
    `group_id` varchar(128) NOT NULL COMMENT 'group_id',
    `tenant_id` varchar(128) DEFAULT '' COMMENT 'tenant_id',
    `tag_id` varchar(128) NOT NULL COMMENT 'tag_id',
    `app_name` varchar(128) DEFAULT NULL COMMENT 'app_name',
    `content` longtext NOT NULL COMMENT 'content',
    `md5` varchar(32) DEFAULT NULL COMMENT 'md5',
    `gmt_create` datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '创建时间',
    `gmt_modified` datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '修改时间',
    `src_user` text COMMENT 'source user',
    `src_ip` varchar(20) DEFAULT NULL COMMENT 'source ip',
    PRIMARY KEY (`id`),
    UNIQUE KEY `uk_configinfotag_datagrouptenanttag` (`data_id`,`group_id`,`tenant_id`,`tag_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='config_info_tag';

/******************************************/
/*   数据库全名 = nacos_config   */
/*   表名称 = config_tags_relation   */
/******************************************/
CREATE TABLE `config_tags_relation` (
    `id` bigint(20) NOT NULL COMMENT 'id',
    `tag_name` varchar(128) NOT NULL COMMENT 'tag_name',
    `tag_type` varchar(64) DEFAULT NULL COMMENT 'tag_type',
    `data_id` varchar(255) NOT NULL COMMENT 'data_id',
    `group_id` varchar(128) NOT NULL COMMENT 'group_id',
    `tenant_id` varchar(128) DEFAULT '' COMMENT 'tenant_id',
    `nid` bigint(20) NOT NULL AUTO_INCREMENT,
    PRIMARY KEY (`nid`),
    UNIQUE KEY `uk_configtagrelation_configidtag` (`id`,`tag_name`,`tag_type`),
    KEY `idx_tenant_id` (`tenant_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='config_tag_relation';

/******************************************/
/*   数据库全名 = nacos_config   */
/*   表名称 = group_capacity   */
/******************************************/
CREATE TABLE `group_capacity` (
    `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键ID',
    `group_id` varchar(128) NOT NULL DEFAULT '' COMMENT 'Group ID，空字符表示整个集群',
    `quota` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '配额，0表示使用默认值',
    `usage` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '使用量',
    `max_size` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '单个配置大小上限，单位为字节，0表示使用默认值',
    `max_aggr_count` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '聚合子配置最大个数，，0表示使用默认值',
    `max_aggr_size` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '单个聚合数据的子配置大小上限，单位为字节，0表示使用默认值',
    `max_history_count` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '最大变更历史数量',
    `gmt_create` datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '创建时间',
    `gmt_modified` datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '修改时间',
    PRIMARY KEY (`id`),
    UNIQUE KEY `uk_group_id` (`group_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='集群、各Group容量信息表';

/******************************************/
/*   数据库全名 = nacos_config   */
/*   表名称 = his_config_info   */
/******************************************/
CREATE TABLE `his_config_info` (
    `id` bigint(64) unsigned NOT NULL,
    `nid` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
    `data_id` varchar(255) NOT NULL,
    `group_id` varchar(128) NOT NULL,
    `app_name` varchar(128) DEFAULT NULL COMMENT 'app_name',
    `content` longtext NOT NULL,
    `md5` varchar(32) DEFAULT NULL,
    `gmt_create` datetime NOT NULL DEFAULT '2010-05-05 00:00:00',
    `gmt_modified` datetime NOT NULL DEFAULT '2010-05-05 00:00:00',
    `src_user` text,
    `src_ip` varchar(20) DEFAULT NULL,
    `op_type` char(10) DEFAULT NULL,
    `tenant_id` varchar(128) DEFAULT '' COMMENT '租户字段',
    PRIMARY KEY (`nid`),
    KEY `idx_gmt_create` (`gmt_create`),
    KEY `idx_gmt_modified` (`gmt_modified`),
    KEY `idx_did` (`data_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='多租户改造';


/******************************************/
/*   数据库全名 = nacos_config   */
/*   表名称 = tenant_capacity   */
/******************************************/
CREATE TABLE `tenant_capacity` (
    `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键ID',
    `tenant_id` varchar(128) NOT NULL DEFAULT '' COMMENT 'Tenant ID',
    `quota` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '配额，0表示使用默认值',
    `usage` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '使用量',
    `max_size` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '单个配置大小上限，单位为字节，0表示使用默认值',
    `max_aggr_count` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '聚合子配置最大个数',
    `max_aggr_size` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '单个聚合数据的子配置大小上限，单位为字节，0表示使用默认值',
    `max_history_count` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '最大变更历史数量',
    `gmt_create` datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '创建时间',
    `gmt_modified` datetime NOT NULL DEFAULT '2010-05-05 00:00:00' COMMENT '修改时间',
    PRIMARY KEY (`id`),
    UNIQUE KEY `uk_tenant_id` (`tenant_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='租户容量信息表';


CREATE TABLE `tenant_info` (
    `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
    `kp` varchar(128) NOT NULL COMMENT 'kp',
    `tenant_id` varchar(128) default '' COMMENT 'tenant_id',
    `tenant_name` varchar(128) default '' COMMENT 'tenant_name',
    `tenant_desc` varchar(256) DEFAULT NULL COMMENT 'tenant_desc',
    `create_source` varchar(32) DEFAULT NULL COMMENT 'create_source',
    `gmt_create` bigint(20) NOT NULL COMMENT '创建时间',
    `gmt_modified` bigint(20) NOT NULL COMMENT '修改时间',
    PRIMARY KEY (`id`),
    UNIQUE KEY `uk_tenant_info_kptenantid` (`kp`,`tenant_id`),
    KEY `idx_tenant_id` (`tenant_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='tenant_info';

CREATE TABLE users (
    username varchar(50) NOT NULL PRIMARY KEY,
    password varchar(500) NOT NULL,
    enabled boolean NOT NULL
);

CREATE TABLE roles (
    username varchar(50) NOT NULL,
    role varchar(50) NOT NULL
);

INSERT INTO users (username, password, enabled) VALUES ('nacos', '$2a$10$EuWPZHzz32dJN7jexM34MOeYirDdFAZm2kuWj7VEOJhhZkDrxfvUu', TRUE);

INSERT INTO roles (username, role) VALUES ('nacos', 'ROLE_ADMIN');

nacos-server-1.1.4\nacos\conf目录下找到application.properties

spring.datasource.platform=mysql

db.num=1
db.url.0=jdbc:mysql://11.162.196.16:3306/nacos_devtest?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true
db.user=nacos_devtest
db.password=youdontknow

##################################################

spring.datasource.platform=mysql

db.num=1
db.url.0=jdbc:mysql://localhost:3306/nacos_config?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true
db.user=root
db.password=123456

启动nacos，可以看到是个全新的空记录界面，以前是记录进derby

Linux版Nacos+MySQL生产环境配置

预计需要，1个nginx+3个nacos注册中心+1个mysql

Nacos下载linux版本

集群配置步骤（重点）

Linux服务器上mysql数据库配置

SQL脚本在哪里

sql语句源文件

nacos-mysql.sql

自己Linux机器上的Mysql数据库黏贴

执行后结果

application.properties配置

位置

内容

spring.datasource.platform=mysql
 
db.num=1
db.url.0=jdbc:mysql://127.0.0.1:3306/nacos_config?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true
db.user=root
db.password=123456

Linux服务器上nacos的集群配置cluster.conf

梳理出3台nacos机器的不同服务端口号

复制出cluster.conf

内容

这个IP不能写127.0.0.1,必须是Linux命令hostname -I能够识别的IP
编辑Nacos的启动脚本startup.sh，使它能够接受不同的启动端

/mynacos/nacos/bin目录下有startup.sh

思考

修改内容

执行方式

Nginx的配置，由它作为负载均衡器

修改nginx的配置文件

nginx.conf

upstream cluster{                                                        
 
    server 127.0.0.1:3333;
    server 127.0.0.1:4444;
    server 127.0.0.1:5555;
}
server{
                          	
    listen 1111;
    server_name localhost;
    location /{
         proxy_pass http://cluster;
}

按照指定启动

截止到此处，1个Nginx+3个nacos注册中心+1个mysql

测试通过nginx访问nacos

https://写你自己虚拟机的ip:1111/nacos/#/login

新建一个配置测试

linux服务器的mysql插入一条记录

测试

微服务cloudalibaba-provider-payment9002启动注册进nacos集群

1	server-addr: 写你自己的虚拟机ip:1111

结果：

高可用总结

十六、pringCloud Alibaba Sentinel实现熔断与限流

1.Sentinel

官网

https://github.com/alibaba/Sentinel

https://github.com/alibaba/Sentinel/wiki/%E4%BB%8B%E7%BB%8D

是什么

去哪下

https://github.com/alibaba/Sentinel/releases

能干嘛

怎么玩

https://spring-cloud-alibaba-group.github.io/github-pages/greenwich/spring-cloud-alibaba.html#_spring_cloud_alibaba_sentinel

服务使用中的各种问题

服务雪崩
服务降级
服务熔断
服务限流

2.安装Sentinel控制台

sentinel组件由2部分组成

后台

前台8080

安装步骤

https://github.com/alibaba/Sentinel/releases

下载到本地sentinel-dashboard-1.7.0.jar

运行命令

前提:java8环境OK,8080端口不能被占用

命令： java -jar sentinel-dashboard-1.7.0.jar

访问sentinel管理界面

http://localhost:8080

登录账号密码均为sentinel

3.初始化演示工程

启动Nacos8848成功 http://localhost:8848/nacos/#/login

Module

cloudalibaba-sentinel-service8401

POM

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud</artifactId>
        <groupId>com.ming</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-sentinel-service8401</artifactId>


    <dependencies>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>4.6.3</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

</project>

YML

server:
  port: 8401

spring:
  application:
    name: cloudalibaba-sentinel-service
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
    sentinel:
      transport:
        dashboard: localhost:8080
        port: 8719  #默认8719，假如被占用了会自动从8719开始依次+1扫描。直至找到未被占用的端口

management:
  endpoints:
    web:
      exposure:
        include: '*'

主启动

@SpringBootApplication
@EnableDiscoveryClient
public class MainApp8401 {
    public static void main(String[] args) {
        SpringApplication.run(MainApp8401.class, args);
    }
}

业务类FlowLimitController

@RestController
public class FlowLimitController {
    @GetMapping("/testA")
    public String testA() {
        return "------testA";
    }

    @GetMapping("/testB")
    public String testB() {
        return "------testB";
    }

}

启动Sentinel8080

启动微服务8401

启动8401微服务后查看sentienl控制台

空空如也，啥都没有~

Sentinel采用的懒加载说明

执行一次访问即可:

http://localhost:8401/testA

http://localhost:8401/testB

结论:sentinel8080正在监控微服务8401

4.流控规则

基本介绍

流控模式

直接（默认）

直接->快速失败(系统默认)
配置及说明
测试

快速点击访问 http://localhost:8401/testA

结果: Blocked by Sentinel (flow limiting)

思考:

直接调用默认报错信息，技术方面OK but，是否应该有我们自己的后续处理？

类似有一个fallback的兜底方法？

关联

是什么？

当关联的资源达到阈值时，就限流自己

当与A关联的资源B达到阈值后，就限流自己

B惹事，A挂了
配置A
postman模拟并发密集访问testB

访问testB成功

postman里新建多线程集合组

将访问地址添加进新线程组

大批量线程高并发访问B，导致A失效了
运行后发现testA挂了

点击访问http://localhost:8401/testA

结果:Blocked by Sentinel (flow limiting)

链路

多个请求调用了同一个微服务

流控效果

直接->快速失败（默认的流控处理）

直接失败，抛出异常:Blocked by Sentinel (flow limiting)

源码:com.alibaba.csp.sentinel.slots.block.flow.controller.DefaultController

预热

说明

公式：阈值除以coldFactor（默认值为3），经过预热时长后才会达到阈值

官网

默认coldFactor为3，即请求QPS从threshold/3开始，经预热时长逐渐升至设定的QPS阈值。

限流冷启动:https://github.com/alibaba/Sentinel/wiki/%E9%99%90%E6%B5%81---%E5%86%B7%E5%90%AF%E5%8A%A8

源码

com.alibaba.csp.sentinel.slots.block.flow.controller.WarmUpController

Warmup配置

多次点击http://localhost:8401/testB

刚开始不行，后续慢慢OK

应用场景

排队等待

匀速排队，阈值必须设置为QPS

官网

源码

com.alibaba.csp.sentinel.slots.block.flow.controller.RateLimiterController

测试

5.降级规则

基本介绍

Sentinel的断路器是没有半开状态的

半开的状态系统自动去检测是否请求有异常，没有异常就关闭断路器恢复使用，有异常则继续打开断路器不可用。具体可以参考Hystrix

降级策略实战

RT

是什么

测试

代码

@GetMapping("/testD")
public String testD()
{
    try { TimeUnit.SECONDS.sleep(1); } catch (InterruptedException e) { e.printStackTrace(); }
    log.info("testD 测试RT");

    return "------testD";
}

配置
jmeter压测
结论

异常比例

是什么

测试

代码

@GetMapping("/testD")
public String testD()
{

    log.info("testD 测试RT");
    int age = 10/0;
    return "------testD";
}

配置
jmeter
结论

异常数

是什么

异常数是按照分钟统计的

测试

代码

@GetMapping("/testE")
public String testE(){
    log.info("testE 测试异常数");
    int age = 10/0;
    return "------testE 测试异常数";
}

配置
jmeter

6.热点key限流

基本介绍

官网

https://github.com/alibaba/Sentinel/wiki/ 热点参数限流

承上启下复习start

@SentinelResource

代码

@GetMapping("/testHotKey")
@SentinelResource(value = "testHotKey",blockHandler = "deal_testHotKey")
public String testHotKey(@RequestParam(value = "p1",required = false) String p1,
                         @RequestParam(value = "p2",required = false) String p2) {
    //int age = 10/0;
    return "------testHotKey";
}

//兜底方法
public String deal_testHotKey (String p1, String p2, BlockException exception){
    return "------deal_testHotKey,o(╥﹏╥)o";  
}

com.alibaba.csp.sentinel.slots.block.BlockException

配置

@SentinelResource(value = “testHotKey”)

异常打到了前台用户界面看不到，不友好
@SentinelResource(value = “testHotKey”,blockHandler = “deal_testHotKey”)

方法testHostKey里面第一个参数只要QPS超过每秒1次，马上降级处理

用了我们自己定义的

测试

error: http://localhost:8401/testHotKey?p1=abc

error: http://localhost:8401/testHotKey?p1=abc&p2=33

right: http://localhost:8401/testHotKey?p2=abc

参数例外项

上述案例演示了第一个参数p1,当QPS超过1秒1次点击后马上被限流

特殊情况

普通: 超过1秒钟一个后，达到阈值1后马上被限流

我们期望p1参数当它是某个特殊值时，它的限流值和平时不一样

特例: 假如当p1的值等于5时，它的阈值可以达到200

配置

测试

http://localhost:8401/testHotKey?p1=5 正常

http://localhost:8401/testHotKey?p1=3 异常

当p1等于5的时候，阈值变为200

当p1不等于5的时候，阈值就是平常的1

前提条件

热点参数的注意点，参数必须是基本类型或者String

其他

手贱添加异常看看….

7.系统规则

是什么

https://github.com/alibaba/Sentinel/wiki/%E7%B3%BB%E7%BB%9F%E8%87%AA%E9%80%82%E5%BA%94%E9%99%90%E6%B5%81

各项配置参数说明

配置全局QPS

8.@SentinelResource

8.1 按资源名称限流+后续处理

启动Nacos成功
启动Sentinel成功

Module cloudalibaba-sentinel-service8401

<dependency>
    <groupId>com.ming.springcloud</groupId>
    <artifactId>cloud-api-commons</artifactId>
    <version>${project.version}</version>
</dependency>

业务类RateLimitController

@RestController
public class RateLimitController {
    @GetMapping("/byResource")
    @SentinelResource(value = "byResource", blockHandler = "handleException")
    public CommonResult byResource() {
        return new CommonResult(200, "按资源名称限流测试OK", new Payment(2020L, "serial001"));
    }

    public CommonResult handleException(BlockException exception) {
        return new CommonResult(444, exception.getClass().getCanonicalName() + "\t 服务不可用");
    }
}

配置流控规则
测试
额外问题

Sentinel控制台，流控规则消失了？？？？？

临时

8.2 按照Url地址限流+后续处理

通过访问的URL来限流，会返回Sentinel自带默认的限流处理信息

业务类RateLimitController

@GetMapping("/rateLimit/byUrl")
@SentinelResource(value = "byUrl")
public CommonResult byUrl() {
    return new CommonResult(200,"按url限流测试OK",new Payment(2020L,"serial002"));
}

访问一次
Sentinel控制台配置
测试

疯狂点击http://localhost:8401/rateLimit/byUrl

8.3 上面兜底方法面临的问题

8.4 客户自定义限流处理逻辑

创建customerBlockHandler类用于自定义限流处理逻辑

自定义限流处理类

public class CustomerBlockHandler {

    public static CommonResult handlerException(BlockException exception) {
        return new CommonResult(4444, "自定义限流处理信息....CustomerBlockHandler");
    }

    public static CommonResult handlerException2(BlockException exception) {
        return new CommonResult(4424, "自定义限流处理信息....CustomerBlockHandler");
    }
}

RateLimitController

@GetMapping("/rateLimit/customerBlockHandler")
@SentinelResource(value = "customerBlockHandler",
        blockHandlerClass = CustomerBlockHandler.class,
        blockHandler = "handlerException2")
public CommonResult customerBlockHandler() {
    return new CommonResult(200,"按客戶自定义",new Payment(2020L,"serial003"));
}

启动微服务后先调用一次
Sentinel控制台配置
测试后我们自定义的出来了
进一步说明

8.5 更多注解属性说明

Sentinel主要有三个核心API

SphU定义资源
Tracer定义统计
ContextUtil定义了上下文

9.服务熔断功能

sentinel整合ribbon+openFeign+fallback

9.1Ribbon系列

启动nacos和sentinel

提供者9003/9004

新建cloudalibaba-provider-payment9003/9004

POM

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud</artifactId>
        <groupId>com.ming</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-provider-payment9003</artifactId>

    <dependencies>
        <!--SpringCloud ailibaba nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency><!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
            <groupId>com.ming.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <!-- SpringBoot整合Web组件 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--日常通用jar包配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>


</project>

YML

server:
  port: 9003

spring:
  application:
    name: nacos-payment-provider
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848 #配置Nacos地址

management:
  endpoints:
    web:
      exposure:
        include: '*'

主启动

@SpringBootApplication
@EnableDiscoveryClient
public class PaymentMain9003 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain9003.class, args);
    }
}

业务类

@RestController
public class PaymentController {

    @Value("${server.port}")
    private String serverPort;

    public static HashMap<Long, Payment> hashMap = new HashMap<>();
    static{
        hashMap.put(1L,new Payment(1L,"28a8c1e3bc2742d8848569891fb42181"));
        hashMap.put(2L,new Payment(2L,"bba8c1e3bc2742d8848569891ac32182"));
        hashMap.put(3L,new Payment(3L,"6ua8c1e3bc2742d8848569891xt92183"));
    }

    @GetMapping(value = "/paymentSQL/{id}")
    public CommonResult<Payment> paymentSQL(@PathVariable("id") Long id){
        Payment payment = hashMap.get(id);
        CommonResult<Payment> result = new CommonResult(200,"from mysql,serverPort:  "+serverPort,payment);
        return result;
    }
}

测试地址

http://localhost:9003/paymentSQL/1

消费者84

新建cloudalibaba-consumer-nacos-order84

POM

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud</artifactId>
        <groupId>com.ming</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloudalibaba-consumer-nacos-order84</artifactId>


    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>
        <dependency>
            <groupId>com.ming.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>


</project>

YML

server:
  port: 84

spring:
  application:
    name: nacos-order-consumer
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
    sentinel:
      transport:
        dashboard: localhost:8080
        port: 8719

service-url:
  nacos-user-service: http://nacos-payment-provider

主启动

@SpringBootApplication
@EnableDiscoveryClient
public class OrderNacosMain84 {
    public static void main(String[] args) {
        SpringApplication.run(OrderNacosMain84.class, args);
    }
}

业务类

package com.ming.springcloud.config;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class ApplicationContextConfig {

    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate()
    {
        return new RestTemplate();
    }
}

package com.ming.springcloud.controller;

import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.ming.springcloud.entities.CommonResult;
import com.ming.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

@RestController
@Slf4j
public class CircleBreakerController {

    public static final String SERVICE_URL = "http://nacos-payment-provider";

    @Resource
    private RestTemplate restTemplate;


    @RequestMapping("/consumer/fallback/{id}")
    @SentinelResource(value = "fallback") //没有配置
    //@SentinelResource(value = "fallback",fallback = "handlerFallback") //fallback只负责业务异常
    //@SentinelResource(value = "fallback",blockHandler = "blockHandler") //blockHandler只负责sentinel控制台配置违规
    //    @SentinelResource(value = "fallback", fallback = "handlerFallback", blockHandler = "blockHandler", exceptionsToIgnore = {IllegalArgumentException.class})//不管的异常
    public CommonResult<Payment> fallback(@PathVariable Long id) {
        CommonResult<Payment> result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/" + id, CommonResult.class, id);

        if (id == 4) {
            throw new IllegalArgumentException("IllegalArgumentException,非法参数异常....");
        } else if (result.getData() == null) {
            throw new NullPointerException("NullPointerException,该ID没有对应记录,空指针异常");
        }

        return result;
    }

    //fallback
    public CommonResult handlerFallback(@PathVariable Long id, Throwable e) {
        Payment payment = new Payment(id, "null");
        return new CommonResult<>(444, "兜底异常handlerFallback,exception内容  " + e.getMessage(), payment);
    }

    //blockHandler
    public CommonResult blockHandler(@PathVariable Long id, BlockException blockException) {
        Payment payment = new Payment(id, "null");
        return new CommonResult<>(445, "blockHandler-sentinel限流,无此流水: blockException  " + blockException.getMessage(), payment);
    }

}

fallback管运行异常

blockHandler管配置违规

忽略属性

9.2Feign系列

修改84模块

POM

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

YML

server:
  port: 84

spring:
  application:
    name: nacos-order-consumer
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
    sentinel:
      transport:
        dashboard: localhost:8080
        port: 8719

service-url:
  nacos-user-service: http://nacos-payment-provider

#对Feign的支持
feign:
  sentinel:
    enabled: true

业务类

package com.ming.springcloud.service;

import com.ming.springcloud.entities.CommonResult;
import com.ming.springcloud.entities.Payment;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

@FeignClient(value = "nacos-payment-provider",fallback = PaymentFallbackService.class)
public interface PaymentService {
    @GetMapping(value = "/paymentSQL/{id}")
    public CommonResult<Payment> paymentSQL(@PathVariable("id") Long id);
}

package com.ming.springcloud.service;

import com.ming.springcloud.entities.CommonResult;
import com.ming.springcloud.entities.Payment;
import org.springframework.stereotype.Component;

@Component
public class PaymentFallbackService implements PaymentService {
    @Override
    public CommonResult<Payment> paymentSQL(Long id) {
        return new CommonResult<>(44444,"服务降级返回,---PaymentFallbackService",new Payment(id,"errorSerial"));
    }
}

Controller

// OpenFeign
@Resource
private PaymentService paymentService;

@GetMapping(value = "/consumer/paymentSQL/{id}")
public CommonResult<Payment> paymentSQL(@PathVariable("id") Long id) {
    return paymentService.paymentSQL(id);
}

主启动

添加@EnableFeignClients启动Feign的功能
http://localhost:84/consumer/paymentSQL/1
测试84调用9003，此时故意关闭9003微服务提供者，看84消费侧自动降级，不会被耗死

9.3熔断框架比较

10.规则持久化

是什么

一旦我们重启应用，Sentinel规则将消失，生产环境需要将配置规则进行持久化

怎么玩

将限流配置规则持久化进Nacos保存，只要刷新8401某个rest地址，sentinel控制台的流控规则就能看到，只要Nacos里面的配置不删除，针对8401上Sentinel上的流控规则持续有效

步骤

修改cloudalibaba-sentinel-service8401

POM

<dependency>
    <groupId>com.alibaba.csp</groupId>
    <artifactId>sentinel-datasource-nacos</artifactId>
</dependency>

YML

server:
  port: 8401

spring:
  application:
    name: cloudalibaba-sentinel-service
  cloud:
    nacos:
      discovery:
        server-addr: localhost:8848
    sentinel:
      transport:
        dashboard: localhost:8080
        port: 8719  #默认8719，假如被占用了会自动从8719开始依次+1扫描。直至找到未被占用的端口
      datasource:
        ds1:
          nacos:
            server-addr: localhost:8848
            dataId: cloudalibaba-sentinel-service
            groupId: DEFAULT_GROUP
            data-type: json
            rule-type: flow

management:
  endpoints:
    web:
      exposure:
        include: '*'

feign:
  sentinel:
    enabled: true # 激活Sentinel对Feign的支持

添加Nacos业务规则配置
启动8401后刷新sentinel发现业务规则有了
快速访问测试接口
停止8401再看sentinel
重新启动8401再看sentinel

扎一看还是没有，稍等一会儿

多次调用 : http://localhost:8401/rateLimit/byUrl

重新配置出现了，持久化验证通过

十七、SpringCloud Alibaba Seata处理分布式事务

1.分布式事务问题

分布式前

单机单库没这个问题

从1：1 -> 1:N -> N: N

分布式之后

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

2.Seata简介

是什么

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

http://seata.io/zh-cn/

能干嘛

一个典型的分布式事务过程

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

3组件概念:

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

去哪下

发布说明:https://github.com/seata/seata/releases

怎么玩

Spring 本地@Transactional

全局@GlobalTransactional

SEATA的分布式交易解决方案

3.Seata-Server安装

官网地址

http://seata.io/zh-cn/
下载版本
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

service模块
1
vgroup_mapping.my_test_tx_group = "fsp_tx_group"
store模块
1
2
3
4
5
mode = "db"

url = "jdbc:mysql://127.0.0.1:3306/seata"
user = "root"
password = "123456"
mysql5.7数据库新建库seata
在seata库里建表

建表db_store.sql在\seata-server-0.9.0\seata\conf目录里面

修改seata-server-0.9.0\seata\conf目录下的registry.conf配置文件

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"
 
  nacos {
    serverAddr = "localhost:8848"
    namespace = ""
    cluster = "default"
  }

先启动Nacos端口号8848
再启动seata-server

seata-server-0.9.0\seata\bin\seata-server.bat

4.订单/库存/账户业务数据库准备

以下演示都需要先启动Nacos后启动Seata，保证两个都OK(Seata没启动报错no available server to connect)

分布式事务业务说明

业务说明

下订单–>扣库存–>减账户（余额）

创建业务数据库

seata_order: 存储订单的数据库
seata_storage:存储库存的数据库
seata_account: 存储账户信息的数据库

CREATE DATABASE seata_order；
 
CREATE DATABASE seata_storage；
 
CREATE DATABASE seata_account；

按照上述3库分别建对应业务表

seata_order库下建t_order表

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库下建t_storage表

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库下建t_account表

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

建表SQL

drop table `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=1 DEFAULT CHARSET=utf8;

最终效果

5.订单/库存/账户业务微服务准备

业务需求

下订单->减库存->扣余额->改（订单）状态

新建订单Order-Module

seata-order-service2001

POM

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud</artifactId>
        <groupId>com.ming</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>seata-order-service2001</artifactId>

    <dependencies>
        <!--nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--seata-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>seata-all</artifactId>
                    <groupId>io.seata</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-all</artifactId>
            <version>0.9.0</version>
        </dependency>
        <!--feign-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!--web-actuator-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--mysql-druid-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.18</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

</project>

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.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/seata_order?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=GMT%2B8
    username: root
    password: 123456

feign:
  hystrix:
    enabled: false

logging:
  level:
    io:
      seata: info

mybatis:
  mapperLocations: classpath:mapper/*.xml

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"
}

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.cj.jdbc.Driver"
    url = "jdbc:mysql://localhost:3306/seata_order?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=GMT%2B8"
    user = "root"
    password = "123456"
    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
  }
}

registry.conf

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 = "fsp_tx_group"
    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"
  }
}

domain

package com.ming.springcloud.alibaba.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.math.BigDecimal;


@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
}

package com.ming.springcloud.alibaba.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;


@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {
    private Integer code;
    private String  message;
    private T       data;

    public CommonResult(Integer code, String message) {
        this(code,message,null);
    }
}

Dao接口及实现

package com.ming.springcloud.alibaba.dao;

import com.ming.springcloud.alibaba.domain.Order;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

@Mapper
public interface OrderDao {
    //新建订单
    void create(Order order);

    //修改订单状态，从零改为1
    void update(@Param("userId") Long userId, @Param("status") Integer status);
}

Service接口及实现

package com.ming.springcloud.alibaba.service.impl;

import com.ming.springcloud.alibaba.dao.OrderDao;
import com.ming.springcloud.alibaba.domain.Order;
import com.ming.springcloud.alibaba.service.AccountService;
import com.ming.springcloud.alibaba.service.OrderService;
import com.ming.springcloud.alibaba.service.StorageService;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

@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
     */

    @Override
    @GlobalTransactional(name = "fsp-create-order",rollbackFor = Exception.class)
    public void create(Order order){
        log.info("----->开始新建订单");
        //新建订单
        orderDao.create(order);

        //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");

        //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");


        //修改订单状态，从零到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");

    }
}

Controller

package com.ming.springcloud.alibaba.controller;

import com.ming.springcloud.alibaba.domain.CommonResult;
import com.ming.springcloud.alibaba.domain.Order;
import com.ming.springcloud.alibaba.service.OrderService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@Slf4j
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");
    }

}

Config配置

package com.ming.springcloud.alibaba.config;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@MapperScan({"com.ming.springcloud.alibaba.dao"})
public class MyBatisConfig {

}

package com.ming.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;


@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();
    }

}

主启动

package com.ming.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;

@EnableDiscoveryClient
@EnableFeignClients
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)//取消数据源自动创建的配置
public class SeataOrderMainApp2001{

    public static void main(String[] args) {
        SpringApplication.run(SeataOrderMainApp2001.class, args);
    }
}

新建库存Storage-Module

seata-storage-service2002

新建账户Account-Module

seata-account-service2003

6.Test

正常下单

http://localhost:2001/order/create?userId=1&productId=1&count=10&money=100

数据库情况

超时异常，没加@GlobalTransactional

AccountServiceImpl添加超时

数据库情况

当库存和账户余额扣减后，订单状态并没有设置为已经完成，没有从零改为1
而且由于feign的重试机制，账户余额还有可能被多次扣减

超时异常，添加@GlobalTransactional

AccountServiceImpl添加超时

OrderServiceImpl加上@GlobalTransactional

下单后数据库数据并没有任何改变

记录都添加不进来

7.Seata之原理简介

Seata

2019年1月份蚂蚁金服和阿里巴巴共同开源的分布式事务解决方案

Simple Extensible Autonomous Transaction Architecture,简单可扩展自治事务框架

2020起初，参加工作后用1.0以后的版本

再看TC/TM/RM三大组件

分布式事务的执行流程

TM开启分布式事务(TM向TC注册全局事务记录)
换业务场景，编排数据库，服务等事务内资源（RM向TC汇报资源准备状态）
TM结束分布式事务，事务一阶段结束（TM通知TC提交/回滚分布式事务）
TC汇总事务信息，决定分布式事务是提交还是回滚
TC通知所有RM提交/回滚资源，事务二阶段结束。

十四、SpringCloud Alibaba入门简介

1.why会出现SpringCloud alibaba

2.SpringCloud alibaba带来了什么？

是什么

能干嘛

去哪下

怎么玩

3.SpringCloud alibaba学习资料获取

官网

英文

中文

十五、SpringCloud Alibaba Nacos服务注册和配置中心

1.Nacos简介

为什么叫Nacos

是什么

能干嘛

去哪下

各种注册中心比较

2.安装并运行Nacos

3.Nacos作为服务注册中心演示

官网文档

基于Nacos的服务提供者

基于Nacos的服务消费者

服务注册中心对比

4.Nacos作为服务配置中心演示

Nacos作为配置中心-基础配置

Nacos作为配置中心-分类配置

问题

Nacos的图形化管理界面

Namespace+Group+Data ID三者关系？为什么这么设计？

Case

DataID方案

Group方案

Namespace方案

5.Nacos集群和持久化配置（重要）

官网说明

Nacos持久化配置解释

Linux版Nacos+MySQL生产环境配置

十六、pringCloud Alibaba Sentinel实现熔断与限流

1.Sentinel

官网

是什么

去哪下

能干嘛

怎么玩

服务使用中的各种问题

2.安装Sentinel控制台

sentinel组件由2部分组成

安装步骤

运行命令

访问sentinel管理界面

3.初始化演示工程

4.流控规则

基本介绍

流控模式

直接（默认）

关联

链路

流控效果

直接->快速失败（默认的流控处理）

预热

说明

官网

源码

Warmup配置

应用场景

排队等待

官网

源码

测试

5.降级规则

基本介绍

降级策略实战

RT

是什么

测试

异常比例

是什么

测试

异常数