Merge pull request from vishal1023/origin/BAEL-4785

Origin/bael 4785
This commit is contained in:
Jonathan Cook 2021-04-15 13:48:22 +02:00 committed by GitHub
commit cbd6ad341f
13 changed files with 204 additions and 0 deletions

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package com.baeldung.springbean.naming.component;
public interface Animal {
String name();
}

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package com.baeldung.springbean.naming.component;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
@Component
@Qualifier("cat")
public class Cat implements Animal {
@Override
public String name() {
return "Cat";
}
}

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package com.baeldung.springbean.naming.component;
import org.springframework.stereotype.Component;
@Component("myBean")
public class CustomComponent {
}

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package com.baeldung.springbean.naming.component;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
@Component
@Qualifier("dog")
public class Dog implements Animal {
@Override
public String name() {
return "Dog";
}
}

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package com.baeldung.springbean.naming.configuration;
import com.baeldung.springbean.naming.service.AuditService;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class AuditConfiguration {
@Bean
public AuditService audit() {
return new AuditService();
}
}

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package com.baeldung.springbean.naming.configuration;
import com.baeldung.springbean.naming.component.CustomComponent;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration("configuration")
public class MyConfiguration {
@Bean("qualifierComponent")
public CustomComponent component() {
return new CustomComponent();
}
@Bean("beanComponent")
public CustomComponent myComponent() {
return new CustomComponent();
}
}

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package com.baeldung.springbean.naming.controller;
import com.baeldung.springbean.naming.service.MessagingService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
@Controller
public class MessagingController {
@Autowired
private MessagingService service;
}

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package com.baeldung.springbean.naming.service;
public class AuditService {
}

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package com.baeldung.springbean.naming.service;
import org.springframework.stereotype.Service;
@Service
public class LoggingService {
}

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package com.baeldung.springbean.naming.service;
public interface MessagingService {
}

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package com.baeldung.springbean.naming.service;
import com.baeldung.springbean.naming.component.CustomComponent;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
@Service
public class MessagingServiceImpl implements MessagingService {
@Autowired
@Qualifier("qualifierComponent")
private CustomComponent customComponent;
}

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package com.baeldung.springbean.naming.service;
import com.baeldung.springbean.naming.component.Animal;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
@Service
public class PetShow {
@Autowired
@Qualifier("dog")
private Animal dog;
@Autowired
@Qualifier("cat")
private Animal cat;
public Animal getDog() {
return dog;
}
public Animal getCat() {
return cat;
}
}

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package com.baeldung.springbean.naming;
import com.baeldung.springbean.naming.component.Cat;
import com.baeldung.springbean.naming.component.Dog;
import com.baeldung.springbean.naming.service.PetShow;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.test.context.junit.jupiter.SpringExtension;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertNotNull;
@ExtendWith(SpringExtension.class)
public class SpringBeanNamingUnitTest {
private AnnotationConfigApplicationContext context;
@BeforeEach
void setUp() {
context = new AnnotationConfigApplicationContext();
context.scan("com.baeldung.springbean.naming");
context.refresh();
}
// To name a bean spring gets the class name and converts the first letter to lowercase.
// Default naming strategy of the spring bean which is using class level annotation
@Test
void givenLoggingServiceBeanIsCreated_whenThereIsNoValueProvided_thenBeanNameShouldBeDefaultName() {
assertNotNull(context.getBean("loggingService"));
}
// In this case, to name a bean spring gets the class name and converts the first letter to lowercase.
@Test
void givenAuditServiceBeanIsCreatedWithMethodLevelAnnotation_whenThereIsNoValueProvided_thenBeanNameShouldBeTheNameOfMethod() {
assertNotNull(context.getBean("audit"));
}
// spring will create the bean of type CustomComponent with the name "myBean".
// As we're explicitly giving the name to the bean, spring will use this name to refer to it.
@Test
void givenCustomComponentBeanIsCreate_whenThereIsCustomNameGivenToBean_thenBeanShouldBeIdentifiedByThatName() {
assertNotNull(context.getBean("myBean"));
}
@Test
void givenCustomComponentBeanIsCreated_whenCustomNameIsGivenOnMethodLevelAnnotation_thenBeanShouldBeIdentifiedByThatName() {
assertNotNull(context.getBean("beanComponent"));
assertNotNull(context.getBean("configuration"));
assertNotNull(context.getBean("qualifierComponent"));
}
@Test
void givenMultipleImplementationsOfAnimal_whenFieldIsInjectedWithQualifiedName_thenTheSpecificBeanShouldGetInjected() {
PetShow petShow = (PetShow) context.getBean("petShow");
assertNotNull(context.getBean("cat"));
assertNotNull(context.getBean("dog"));
assertThat(petShow.getCat().getClass()).isEqualTo(Cat.class);
assertThat(petShow.getDog().getClass()).isEqualTo(Dog.class);
}
}