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Seata 整合学习完成

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YoVinchen
2023-08-18 23:43:35 +08:00
parent 2ee2961731
commit 401f58e46f
26 changed files with 178 additions and 110 deletions
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2
borrow-service/pom.xml
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@@ -20,7 +20,7 @@
<dependencies>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
<artifactId>spring-cloud-starter-alibaba-seata</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>

2
borrow-service/src/main/java/com/test/BorrowApplication.java
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@@ -1,5 +1,6 @@
package com.test;
import io.seata.spring.annotation.datasource.EnableAutoDataSourceProxy;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;
@@ -12,6 +13,7 @@ import org.springframework.cloud.openfeign.EnableFeignClients;
* @Create 2023/8/14 16:25
*/
@EnableFeignClients
@EnableAutoDataSourceProxy
@SpringBootApplication
public class BorrowApplication {
public static void main(String[] args) {

60
borrow-service/src/main/java/com/test/controller/BorrowController.java
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@@ -1,14 +1,10 @@
package com.test.controller;
import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.fastjson.JSONObject;
import com.test.entity.User;
import com.test.entity.UserBorrowDetail;
import com.test.service.BorrowService;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
@@ -28,58 +24,20 @@ public class BorrowController {
@Resource
BorrowService service;
@RequestMapping("/borrow1/{uid}")
UserBorrowDetail findUserBorrows1(@PathVariable("uid") int uid) {
@RequestMapping("/borrow/{uid}")
UserBorrowDetail findUserBorrows(@PathVariable("uid") int uid){
return service.getUserBorrowDetailByUid(uid);
}
@RequestMapping("/borrow2/{uid}")
@SentinelResource(value = "findUserBorrows2", blockHandler = "test")
UserBorrowDetail findUserBorrows2(@PathVariable("uid") int uid) throws InterruptedException {
throw new RuntimeException();
}
@RequestMapping("/borrow/take/{uid}/{bid}")
JSONObject borrow(@PathVariable("uid") int uid,
@PathVariable("bid") int bid){
service.doBorrow(uid, bid);
UserBorrowDetail test(int uid, BlockException e) {
// 输出降级异常
System.out.println(e.getClass());
return new UserBorrowDetail(new User(), Collections.emptyList());
}
@RequestMapping("/blocked")
JSONObject blocked() {
JSONObject object = new JSONObject();
object.put("code", 403);
object.put("success", false);
object.put("massage", "您的请求频率过快，请稍后再试！");
object.put("code", "200");
object.put("success", true);
object.put("message", "借阅成功！");
return object;
}
// @RequestMapping("/test")
// @SentinelResource(value = "test", fallback = "except", //fallback指定出现异常时的替代方案
// blockHandler = "blocked",
//// 特别注意这种方式会在没有配置blockHandler的情况下，将Sentinel机制内（也就是限流的异常）的异常也一并处理了，如果配置了blockHandler，那么在出现限流时，依然只会执行blockHandler指定的替代方案（因为限流是在方法执行之前进行的）
// exceptionsToIgnore = IOException.class)
// //忽略那些异常，也就是说这些异常出现时不使用替代方案
// String test() {
// throw new RuntimeException("HelloWorld！");
// }
//
// //替代方法必须和原方法返回值和参数一致，最后可以添加一个Throwable作为参数接受异常
// String except(Throwable t) {
// return t.getMessage();
// }
@RequestMapping("/test")
@SentinelResource("test")
//注意这里需要添加@SentinelResource才可以，用户资源名称就使用这里定义的资源名称
String findUserBorrows2(@RequestParam(value = "a", required = false) String a, @RequestParam(value = "b", required = false) String b, @RequestParam(value = "c", required = false) String c) {
return "请求成功！a = " + a + ", b = " + b + ", c = " + c;
}
//模拟慢调用
@RequestMapping("/slowCall/{uid}")
String slowCall(@PathVariable("uid") int uid) throws InterruptedException {
//模拟慢调用
Thread.sleep(1000);
return "Hello World";
}
}

4
borrow-service/src/main/java/com/test/mapper/BorrowMapper.java
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@@ -1,6 +1,7 @@
package com.test.mapper;
import com.test.entity.Borrow;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
@@ -23,4 +24,7 @@ public interface BorrowMapper {
@Select("select * from DB_BORROW where bid = #{bid} and uid = #{uid}")
Borrow getBorrow(int uid, int bid);
@Insert("insert into db_borrow(uid, bid) values (#{uid},#{bid})")
int addBorrow(int uid, int bid);
}

1
borrow-service/src/main/java/com/test/service/BorrowService.java
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@@ -13,4 +13,5 @@ import com.test.entity.UserBorrowDetail;
public interface BorrowService {
UserBorrowDetail getUserBorrowDetailByUid(int uid);
boolean doBorrow(int uid, int bid);
}

6
borrow-service/src/main/java/com/test/service/client/BookClient.java
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@@ -17,4 +17,10 @@ public interface BookClient {
@RequestMapping("/book/{bid}")
Book getBookById(@PathVariable("bid") int bid);
@RequestMapping("/book/borrow/{bid}")
boolean bookBorrow(@PathVariable("bid") int bid);
@RequestMapping("/book/remain/{bid}")
int bookRemain(@PathVariable("bid") int bid);
}

6
borrow-service/src/main/java/com/test/service/client/UserClient.java
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@@ -17,4 +17,10 @@ public interface UserClient {
@RequestMapping("/user/{uid}")
User getUserById(@PathVariable("uid") int uid);
@RequestMapping("/user/borrow/{uid}")
boolean userBorrow(@PathVariable("uid") int uid);
@RequestMapping("/user/remain/{uid}")
int userRemain(@PathVariable("uid") int uid);
}

21
borrow-service/src/main/java/com/test/service/client/UserClientImpl.java
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@@ -1,21 +0,0 @@
package com.test.service.client;
import com.test.entity.User;
import org.springframework.stereotype.Component;
/**
* ClassName: UserClientImpl
* Package: com.test.service.client
*
* @author yovinchen
* @Create 2023/8/17 22:25
*/
@Component
public class UserClientImpl implements UserClient{
@Override
public User getUserById(int uid) {
User user = new User();
user.setName("我是替代方案");
return user;
}
}

29
borrow-service/src/main/java/com/test/service/impl/BorrowServiceImpl.java
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@@ -1,8 +1,5 @@
package com.test.service.impl;
import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.test.entity.Book;
import com.test.entity.Borrow;
import com.test.entity.User;
@@ -11,6 +8,7 @@ import com.test.mapper.BorrowMapper;
import com.test.service.BorrowService;
import com.test.service.client.BookClient;
import com.test.service.client.UserClient;
import io.seata.spring.annotation.GlobalTransactional;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@@ -38,7 +36,6 @@ public class BorrowServiceImpl implements BorrowService {
BookClient bookClient;
@Override
@SentinelResource(value = "details", blockHandler = "blocked")
public UserBorrowDetail getUserBorrowDetailByUid(int uid) {
List<Borrow> borrow = mapper.getBorrowsByUid(uid);
User user = userClient.getUserById(uid);
@@ -49,8 +46,26 @@ public class BorrowServiceImpl implements BorrowService {
return new UserBorrowDetail(user, bookList);
}
//替代方案，注意参数和返回值需要保持一致，并且参数最后还需要额外添加一个BlockException
public UserBorrowDetail blocked(int uid, BlockException e) {
return new UserBorrowDetail(null, Collections.emptyList());
@Override
@GlobalTransactional
public boolean doBorrow(int uid, int bid) {
//1. 判断图书和用户是否都支持借阅
if(bookClient.bookRemain(bid) < 1)
throw new RuntimeException("图书数量不足");
if(userClient.userRemain(uid) < 1)
throw new RuntimeException("用户借阅量不足");
//2. 首先将图书的数量-1
if(!bookClient.bookBorrow(bid))
throw new RuntimeException("在借阅图书时出现错误！");
//3. 添加借阅信息
if(mapper.getBorrow(uid, bid) != null)
throw new RuntimeException("此书籍已经被此用户借阅了！");
if(mapper.addBorrow(uid, bid) <= 0)
throw new RuntimeException("在录入借阅信息时出现错误！");
//4. 用户可借阅-1
if(!userClient.userBorrow(uid))
throw new RuntimeException("在借阅时出现错误！");
//完成
return true;
}
}

28
borrow-service/src/main/resources/application.yml
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@@ -17,17 +17,23 @@ spring:
# 将ephemeral修改为false，表示非临时实例（用于持续监控）
ephemeral: false
cluster-name: Chengdu
namespace: dd668135-0bfe-489f-ab2b-24aefb21d156
loadbalancer:
nacos:
enabled: true
sentinel:
transport:
# 添加监控页面地址即可
dashboard: localhost:8858
# 关闭Context收敛，这样被监控方法可以进行不同链路的单独控制
web-context-unify: false
block-page: /blocked
feign:
circuitbreaker:
enabled: true
seata:
# 注册
registry:
# 使用Nacos
type: nacos
nacos:
# 使用Seata的命名空间，这样才能正确找到Seata服务，由于组使用的是SEATA_GROUP，配置默认值就是，就不用配了
namespace: c0495138-b5b3-440d-8f1c-dc8cc9ba5fbc
username: nacos
password: nacos
# 配置
config:
type: nacos
nacos:
namespace: c0495138-b5b3-440d-8f1c-dc8cc9ba5fbc
username: nacos
password: nacos