Layer3gen

Generates the standard SPRING 3 layer CRUD architecture starting from JPA entities.

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How to run as a standalone application:

1. Download and extract the ZIP/TAR file from releases;
2. Edit the file in /bin directory named 3layer-settings.yml;
3. Run the application (layer3gen.sh or layer3gen.bat).

How to run as gradle plugin:

1. Add the plugin in your build.gradle;

plugins {
    id "gae.piaz.layer3gen" version "1.9"
}

or you can use gradle legacy plugin for older gradle versions:

buildscript {
    dependencies {
	classpath "gae.piaz:layer3gen:1.9"
    }
    // ....
}
// ...
apply plugin: 'gae.piaz.layer3gen'

2. Create a file named 3layer-settings.yml (you willl find an example below) in the directory src/main/resources/;
3. Run the gradle task.

gradlew clean build layer3gen

3layer-settings.yml configuration template:

projectPath: /home/yourproject/demo
# projectPath: c://workspace/demo
classesDirectory: build/classes/java/main
outputDirectory : src/main/java
options:
  dtoLayer : true # generates the dto from entities, controller using dto, and mapper layer
  serviceInterface: true # whatever to generate CrudService Interface or not
  entityControllers: false # whatever to generate controller using jpa entity or not

inputPackages:
  jpaEntities : com.example.demo.model

outputPackages:
  repositories : com.example.demo.repository
  services: com.example.demo.service
  controllers: com.example.demo.controller
  dtos: gae.piaz.layer3gen.output.dtos # if this in not specified the dto package will be under the controllers package
  mappers: gae.piaz.layer3gen.output.mappers # if this in not specified the mapper package will be under the services package

Examples:

Checkout the example project with generated classes present in /demo and /demo-jakarta folder.

Repository generated example class:

@Repository
public interface BooksRepository extends JpaRepository<Books, java.lang.Integer> {

}

Service generated example class:

@Service
public class BooksService implements CrudService<Books,java.lang.Integer> {

    @Autowired
    private BooksRepository repository;

    @Override
    public Books create(Books entity) {
        return repository.save(entity);
    }

    @Override
    public Books update(Books entity) {
        return repository.save(entity);
    }

    @Override
    public Page<Books> find(Books entity, Pageable pageable) {
        Example<Books> example = Example.of(entity);
        return repository.findAll(example,pageable);
    }

    @Override
    public Optional<Book> getOne(java.lang.Integer primaryKey) {
        return repository.findById(primaryKey);
    }

    @Override
    public void delete(java.lang.Integer primaryKey) {
        repository.deleteById(primaryKey);
    }
}

Controller generated example class:

@RestController
@RequestMapping("/books-dto/")
public class BooksControllerDTO implements CrudController<BooksDTO,java.lang.Integer>{

    @Autowired
    private BooksService service;

    @Autowired
    private BooksMapper mapper;

    @Override
    public ResponseEntity<BooksDTO> create(@RequestBody BooksDTO dto) {
       Books entity = mapper.toEntity(dto);
       entity = service.create(entity);
       return ResponseEntity.ok(mapper.toDto(entity));
    }

    @Override
    public ResponseEntity<BooksDTO> update(@RequestBody BooksDTO dto) {
      Books entity = mapper.toEntity(dto);
       entity = service.update(entity);
       return ResponseEntity.ok(mapper.toDto(entity));
    }

    @Override
    public ResponseEntity<Page<BooksDTO>> find(
            @RequestBody BooksDTO dto,
            @RequestParam("page") Integer page,
            @RequestParam("size") Integer size) {
        Pageable pageable = PageRequest.of(page,size);
        Books entity = mapper.toEntity(dto);
        Page<BooksDTO> pages = service.find(entity, pageable).map(mapper::toDto);
        return ResponseEntity.ok(pages);
    }

    @Override
    public ResponseEntity<BookDTO> getOne(@PathVariable("id") java.lang.Integer primaryKey) {
        Optional<Book> entity = service.getOne(primaryKey);
        return entity.map(e -> ResponseEntity.ok(mapper.toDto(e))).orElseGet(() -> ResponseEntity.notFound().build());
    }

    @Override
    public void delete(java.lang.Integer primaryKey) {
        service.delete(primaryKey);
    }
}

Other insight can be found in this blog post: https://medium.com/p/49f3fbbc7b2d