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Structure

API structure consists of such modules:

  • impl
  • spec
  • dto



impl module

this module contains project controllers. Here example is an example of api-impl structure:

Controller example is given below:


LoginAPIImpl 
package com.knubisoft.api.impl;

import com.knubisoft.api.dto.GenericApiResponse;
import com.knubisoft.api.dto.JwtTokensResponse;
import com.knubisoft.api.dto.LoginRequest;
import com.knubisoft.api.spec.LoginAPI;
import com.knubisoft.service.LoginService;
import lombok.RequiredArgsConstructor;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RestController;

import javax.validation.Valid;

@RequiredArgsConstructor
@RestController
public class LoginAPIImpl implements LoginAPI {

    private final LoginService loginService;

    @Override
    public ResponseEntity<GenericApiResponse<JwtTokensResponse>> login(@Valid final LoginRequest requestBody) {
        final JwtTokensResponse result = loginService.login(requestBody.getUsername(), requestBody.getPassword());
        return ResponseEntity.ok(new GenericApiResponse<>(result));
    }
}



api spec module

this module consists of xml description of enpoints, controllers, enums, dto and etc. Also generated API interfaces.

About xml description you can find details here

Example of described Login controller with endpoint and generated API interface example is given below:


controller.xml 
<controller xmlns="http://www.knubisoft.com/api/schema/controller">
    <overview>
        <description>
            Login API
        </description>
    </overview>

    <public>
        <!-- Login API flow  -->
        <include value="login"/>
    </public>
</controller>
endpoint.xml 
<endpoint xmlns="http://www.knubisoft.com/api/schema/endpoint">

    <swagger>
        <operationId>login</operationId>
        <summary>Logging in</summary>
        <description>Logging in with user credentials</description>
        <tags>
            <tag>Login</tag>
        </tags>
    </swagger>

    <responses>
        <_200>Success HTTP response from API with HTTP body</_200>
        <_404>Accepted HTTP call request but requested object is NOT FOUND</_404>
    </responses>

    <post>
        <response include="jwtTokensResponse.xml"/>
        <request include="loginRequest.xml"/>
    </post>
</endpoint>
LoginAPI 
package com.knubisoft.api.spec;

import com.fasterxml.jackson.core.type.TypeReference;
import com.knubisoft.api.dto.GenericApiResponse;
import com.knubisoft.api.dto.JwtTokensResponse;
import com.knubisoft.api.dto.LoginRequest;
import com.knubisoft.api.spec.stub.StubFactory;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.responses.ApiResponse;
import io.swagger.v3.oas.annotations.responses.ApiResponses;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.annotation.Generated;
import javax.validation.Valid;

@Validated
@Generated(value = "com.knubisoft.api.generator.Main", date = "2022-08-16T14:48:12.549Z")
@RequestMapping("/api/v1/login")
public interface LoginAPI {

    @Operation(
            summary = "Logging in",
            description = "Logging in with user credentials",
            tags = {"Login"}
    )
    @ApiResponses(
            value = {
                    @ApiResponse(
                            responseCode = "200",
                            description = "Success HTTP response from API with HTTP body"),
                    @ApiResponse(
                            responseCode = "404",
                            description = "Accepted HTTP call request but requested object is NOT FOUND")
            }
    )
    @RequestMapping(
            consumes = "application/json",
            produces = "application/json",
            method = RequestMethod.POST)
    default ResponseEntity<GenericApiResponse<JwtTokensResponse>> login(
            @Valid @RequestBody LoginRequest requestBody) { 

        return ResponseEntity.ok(StubFactory.produce(new TypeReference<GenericApiResponse<JwtTokensResponse>>(){ }));
    } 

}



dto module

Dto module consists of generated classes(requests/responses and enums) that were described in spec module

Here is an example:

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