java configuration deep dive with spring

Josh Long (⻰龙之春)@starbuxman joshlong.com

[email protected] slideshare.net/joshlong

github.com/joshlonghttp://spring.io

J AVA C O N F I G U R AT I O N D E E P D I V E W I T H

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REST DESIGN WITH SPRING

Spring Developer AdvocateAbout Josh Long (⻰龙之春)

@starbuxman [email protected] |

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It’s Easy to Use Spring’s Annotations in Your Code

3


I want Database Access ... with Hibernate 4 Support

4

@Servicepublic class CustomerService {

public Customer getCustomerById( long customerId) { ... }

public Customer createCustomer( String firstName, String lastName, Date date){ ... }

}



5


@Inject // JSR 330 private SessionFactory sessionFactory;

public Customer createCustomer(String firstName, String lastName, Date signupDate) { Customer customer = new Customer(); customer.setFirstName(firstName); customer.setLastName(lastName); customer.setSignupDate(signupDate);

sessionFactory.getCurrentSession().save(customer); return customer; }

}



6


@Inject private SessionFactory sessionFactory;

@Transactional public Customer createCustomer(String firstName, String lastName, Date signupDate) { Customer customer = new Customer(); customer.setFirstName(firstName); customer.setLastName(lastName); customer.setSignupDate(signupDate);

sessionFactory.getCurrentSession().save(customer); return customer; }

}


I want Declarative Cache Management...

7


@Inject private SessionFactory sessionFactory;

@Transactional(readOnly = true) @Cacheable(“customers”) public Customer getCustomerById( long customerId) { ... }

...

}


I want a RESTful Endpoint...

8

package org.springsource.examples.spring31.web;..

@RestControllerclass CustomerController {

@Inject CustomerService customerService;

@RequestMapping(value = "/customer/{id}" ) Customer customerById( @PathVariable Integer id ) { return customerService.getCustomerById(id); } ...}


...But Where’d the SessionFactory come from?

9

The Spring ApplicationContext

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public class Main { public static void main(String [] args) throws Throwable { ApplicationContext ctx = new ClassPathXmlApplication( “my-config.xml” ); CustomerService serviceReference = ctx.getBean( CustomerService.class ); Customer customer = serviceReference.createCustomer( "Juergen", "Hoeller"); }}

From XML:

public class Main { public static void main(String [] args) throws Throwable { ApplicationContext ctx = new AnnotationConfigApplicationContext( ServicesConfiguration.class ); CustomerService serviceReference = ctx.getBean( CustomerService.class ); Customer customer = serviceReference.createCustomer( "Juergen", "Hoeller"); }}

From Java Configuration


A Quick Primer on Configuration

....<beans>

<tx:annotation-driven transaction-manager = "txManager" />

<context:component-scan base-package = "org.springsource.examples.spring31.services" />

<context:property-placeholder properties = "config.properties" />

<bean id = "txManager" class = "org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name = "sessionFactory" ref = "sessionFactory" /> </bean>

<bean id = "sessionFactory" class = "org.springframework.orm.hibernate4.LocalSessionFactoryBean"> ... </bean> <bean id = "dataSource" class = "..SimpleDriverDataSource"> <property name= "userName" value = "${ds.user}"/> ... </bean>

</beans>

ApplicationContext ctx = new ClassPathXmlApplication( “service-config.xml” );



@Configuration@PropertySource("/config.properties")@EnableTransactionManagement@ComponentScan(basePackageClasses = {CustomerService.class})public class ServicesConfiguration {

@Inject private Environment environment;

@Bean public PlatformTransactionManager txManager() throws Exception { return new HibernateTransactionManager(this.sessionFactory()); }

@Bean public SessionFactory sessionFactory() { ... }

@Bean public DataSource dataSource(){ SimpleDriverDataSource sds = new SimpleDriverDataSource(); sds.setUserName( this.environment.getProperty( “ds.user”)); // ... return sds; }

}

ApplicationContext ctx = new AnnotationConfigApplicationContext( ServicesConfiguration.class );



....<beans>






</beans>









}



A Quick Primer on Configuration : Tangent on Injection






}



A Quick Primer on Configuration : Tangent on Injection



@Bean public PlatformTransactionManager txManager( SessionFactory sessionFactory ) throws Exception { return new HibernateTransactionManager( sessionFactory ); }



}




....<beans>






</beans>




@Configuration@PropertySource("/config.properties")@EnableTransactionManagement@ComponentScan (basePackageClasses = {CustomerService.class})public class ServicesConfiguration {





}




....<beans>






</beans>









}




....<beans>






</beans>






@Bean public PlatformTransactionManager txManager() throws Exception { return new HibernateTransactionManager(this.sessionFactory()); } @Bean public SessionFactory sessionFactory() { ... }


}


24

Test Context Framework@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration( loader=AnnotationConfigContextLoader.class, classes={TransferServiceConfig.class, DataConfig.class})@ActiveProfiles("dev")public class TransferServiceTest {

@Autowired private TransferService transferService;

@Test public void testTransferService() { ... }}

REST DESIGN WITH SPRING

Questions

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java configuration deep dive with spring

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