interface FactoryBean<T> {
    public T getObject() throws Exception;
    public Class<?> getObjectType();
    public default boolean isSingleton() { return true; }
}

例

public class AppServiceFactoryBean implements FactoryBean<AppService> {
    public AppService getObject() throws Exception {
        ...
        return appService:
    }

    public Class<?> getObjectType() {
        return AppService.class;
    }
}

Java構成のファクトリ

@Configuration
public class ServiceConfig {

    @Bean
    public AppServiceFactoryBean appService() {
        return new AppServiceFactoryBean();
    }

    @Bean
    public OtherService otherService(AppService appService) {
        return new OtherService(appService);
    }
}

例

ファクトリーメソッドパターン

アイドル・ 9月29日・ 1分読む

#creational #designpatterns #java #pattern