0629 ~ SaaS platform design ~ global exception handling

SaaS Design concept :SaaS by Service providers provide a series of basic network construction , Operation and maintenance , Leasing and other services , According to actual needs , Provide services to service providers , Use the Internet to use the system , It makes the service provider as easy to use as turning on their own faucet , convenient ;

SaaS The best model :

Shared database , Shared data architecture , Use foreign keys to distinguish data

advantage : Use value cost is the lowest , It can store multiple tables , Many libraries , Store multiple data ;

shortcoming : Low isolation , Low security ; Data backup and recovery are difficult ;

Use in actual microservice scenarios feign:

remember : Which microservices need to expose interfaces to other services , Just draw the interface into one feign modular , Whoever needs to call will introduce the module ;

Use cases :

1. Import dependence ;

2. To write feign Interface ;

3. To write feign Implementation class of interface (fallbackFactory)

1. Import dependence ;

 

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

 2. To write feign Interface ;

@FeignClient(value = "service-auth",fallbackFactory = FallbackAuth.class)
public interface FeignAuth {

    @PostMapping(value="/login/save")
    public JSONResult save(@RequestBody Login login);

    @PostMapping(value="/saveLoginMeal")
    public JSONResult saveLoginMealDto(@RequestBody LoginMealDto dto);

 3. To write feign Implementation class of interface (fallbackFactory)  Remember to give the implementation class to spring management

@Component
public class FallbackAuth implements FallbackFactory<FeignAuth> {
    @Override
    public FeignAuth create(Throwable throwable) {
        return new FeignAuth() {
            @Override
            public JSONResult save(Login login) {

                return JSONResult.error(" Registration information saving error ");
            }

            @Override
            public JSONResult saveLoginMealDto(LoginMealDto dto) {
                return JSONResult.error(" Registration information saving error dto");
            }
        };
    }
}

 

Global exception handling

You can customize all exception classes for common system errors , Turn the error information into friendly information and return it to the user , Make users more clear and understandable ;

package cn.itsource.hrm.exception;

import cn.itsource.hrm.result.JSONResult;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

/**
 * Global exception handling tool class
 */
@RestControllerAdvice // It's right Controller To enhance
public class GlobalExceptionHandler {

    // Catch and handle custom exceptions
    @ExceptionHandler(MyException.class)
    public JSONResult MyException(MyException e){
        return JSONResult.error(e.getMessage());
    }

    // Catch and handle arithmetic exceptions
    @ExceptionHandler(ArithmeticException.class)
    public JSONResult methodArithmeticException(ArithmeticException e){
        return JSONResult.error(" Arithmetical abnormality ");
    }

    /**
     * If an exception not caught above occurs , So let's go through the exception capture , It is equivalent to the largest range
     */
    @ExceptionHandler(Exception.class)
    public JSONResult exceptionHandler(Exception e){
        e.printStackTrace();
        return JSONResult.error(" System exception , Please try again later ");
    }
}