Interface non idempotent solution

Project code ：https://github.com/DaZuiZui/Interface-idempotency

1. What is idempotence

​ First, let's think about what idempotency is , There is no side effect of multiple calls of an interface, which is idempotent , If an interface is called many times, the side effect is not idempotent , There is the problem of idempotency

2. Solution

2.1 Distributed lock +token

​ We guarantee idempotency by using redis+token Realized , First, we get... From the server token, Then bring... When requested token For the request , If token stay redis If you exist in the world token Delete , If it does not exist, do not operate .

3.code

3.1 Distributed lock +token

pom.xml

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </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>
    </dependencies>

Controller layer

@RestController
public class TestController {
    
    @Autowired
    private RedisTemplate redisTemplate;


    @GetMapping("/getToken")
    public String getToken(){
    
        String token = UUID.randomUUID().toString().substring(0,8);
        redisTemplate.opsForValue().set(token,"1",60*10, TimeUnit.SECONDS);
        return token;
    }

    @GetMapping("/sub")
    public void sub(String token) throws InterruptedException {
    
        //todo  Business operations 
    }
}

Aop layer

@Aspect
@Component
public class TestAop {
    
    @Autowired
    private RedisTemplate redisTemplate;

    @Before("execution(* com.dazuizui.idempotentinterface.controller.TestController.sub(..))")
    public void befor(JoinPoint proceedingJoinPoint) throws Exception {
    
        Object[] args = proceedingJoinPoint.getArgs();
        boolean b = redisTemplate.delete(args[0]);
        System.out.println(b);
        if (!b){
    
            //todo  Log operations 
            throw new Exception(" Idempotent operation ");
        }
    }
}