Spring's FactoryBean Interface

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

Example

Name: Spring's FactoryBean Interface
Rating: 3 (8386 reviews)
Author: eidher

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

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

FactoryBeans with Java Configuration:

Spring calls getObject() automatically.

@Configuration
public class ServiceConfig {

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

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

Examples

Used in Spring by:

EmbeddedDatabaseFactoryBean
ProxyFactoryBean
JndiObjectFactoryBean
HibernateJpaSessionFactoryBean

Factory Method Pattern

eidher ・ Sep 29 '20 ・ 1 min read

#creational #designpatterns #java #pattern