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Merge pull request #8633 from albanoj2/BAEL-3744 

BAEL-3744: Added examples of how design patterns are used in the Spring framework
This commit is contained in:
Eric Martin 2020-02-15 17:00:08 -06:00 committed by GitHub
parent 49cda16d69 7b47b484e9
commit d18fe0535d
23 changed files with 459 additions and 71 deletions
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158
spring-core-3/pom.xml
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<?xml version="1.0" encoding="UTF-8"?> <?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" <project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion> <modelVersion>4.0.0</modelVersion>
<artifactId>spring-core-3</artifactId> <artifactId>spring-core-3</artifactId>
<name>spring-core-3</name> <name>spring-core-3</name>
<parent> <parent>
<groupId>com.baeldung</groupId> <groupId>com.baeldung</groupId>
<artifactId>parent-spring-5</artifactId> <artifactId>parent-spring-5</artifactId>
<version>0.0.1-SNAPSHOT</version> <version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-spring-5</relativePath> <relativePath>../parent-spring-5</relativePath>
</parent> </parent>
<dependencies> <dependencies>
<dependency> <dependency>
<groupId>org.springframework</groupId> <groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId> <artifactId>spring-beans</artifactId>
<version>${spring.version}</version> <version>${spring.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.springframework</groupId> <groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId> <artifactId>spring-tx</artifactId>
<version>${spring.version}</version> <version>${spring.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.springframework</groupId> <groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId> <artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version> <version>${spring.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>javax.annotation</groupId> <groupId>org.springframework.boot</groupId>
<artifactId>javax.annotation-api</artifactId> <artifactId>spring-boot-starter-web</artifactId>
<version>${annotation-api.version}</version> <version>${spring.boot.version}</version>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.springframework</groupId> <groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId> <artifactId>spring-context</artifactId>
<version>${spring.version}</version> <version>${spring.version}</version>
<scope>test</scope> </dependency>
</dependency> <dependency>
<dependency> <groupId>org.springframework</groupId>
<groupId>org.junit.jupiter</groupId> <artifactId>spring-core</artifactId>
<artifactId>junit-jupiter-engine</artifactId> <version>${spring.version}</version>
<version>${junit-jupiter.version}</version> </dependency>
<scope>test</scope> <dependency>
</dependency> <groupId>javax.annotation</groupId>
<dependency> <artifactId>javax.annotation-api</artifactId>
<groupId>org.junit.jupiter</groupId> <version>${annotation-api.version}</version>
<artifactId>junit-jupiter-api</artifactId> </dependency>
<version>${junit-jupiter.version}</version> <dependency>
<scope>test</scope> <groupId>org.springframework</groupId>
</dependency> <artifactId>spring-test</artifactId>
</dependencies> <version>${spring.version}</version>
<scope>test</scope>
<build> </dependency>
<plugins> <dependency>
<plugin> <groupId>org.junit.jupiter</groupId>
<groupId>org.apache.maven.plugins</groupId> <artifactId>junit-jupiter-engine</artifactId>
<artifactId>maven-surefire-plugin</artifactId> <version>${junit-jupiter.version}</version>
<version>${maven.surefire.version}</version> <scope>test</scope>
</plugin> </dependency>
</plugins> <dependency>
</build> <groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<properties> <version>${junit-jupiter.version}</version>
<maven.surefire.version>2.22.1</maven.surefire.version> <scope>test</scope>
<annotation-api.version>1.3.2</annotation-api.version> </dependency>
</properties> </dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${maven.surefire.version}</version>
</plugin>
</plugins>
</build>
<properties>
<maven.surefire.version>2.22.1</maven.surefire.version>
<annotation-api.version>1.3.2</annotation-api.version>
<spring.boot.version>2.2.2.RELEASE</spring.boot.version>
</properties>
</project> </project>

19
spring-core-3/src/main/java/com/baeldung/spring/patterns/factory/Application.java Normal file
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package com.baeldung.spring.patterns.factory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class Application {
@SuppressWarnings("resource")
public static void main(String[] args) {
ApplicationContext context = new AnnotationConfigApplicationContext(ApplicationConfig.class);
Foo foo = context.getBean(Foo.class);
Bar bar = context.getBean(Bar.class, "Some name");
System.out.println(foo);
System.out.println("Bar's name: " + bar.getName());
}
}

9
spring-core-3/src/main/java/com/baeldung/spring/patterns/factory/ApplicationConfig.java Normal file
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package com.baeldung.spring.patterns.factory;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@ComponentScan(basePackageClasses = ApplicationConfig.class)
public class ApplicationConfig {
}

20
spring-core-3/src/main/java/com/baeldung/spring/patterns/factory/Bar.java Normal file
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package com.baeldung.spring.patterns.factory;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
@Component
@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public class Bar {
private String name;
public Bar(String name) {
this.name = name;
}
public String getName() {
return name;
}
}

7
spring-core-3/src/main/java/com/baeldung/spring/patterns/factory/Foo.java Normal file
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package com.baeldung.spring.patterns.factory;
import org.springframework.stereotype.Component;
@Component
public class Foo {
}

12
spring-core-3/src/main/java/com/baeldung/spring/patterns/proxy/Application.java Normal file
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package com.baeldung.spring.patterns.proxy;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}

18
spring-core-3/src/main/java/com/baeldung/spring/patterns/proxy/Book.java Normal file
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package com.baeldung.spring.patterns.proxy;
public class Book {
private String author;
public Book(String author) {
this.author = author;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
}

18
spring-core-3/src/main/java/com/baeldung/spring/patterns/proxy/BookController.java Normal file
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package com.baeldung.spring.patterns.proxy;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class BookController {
@Autowired
private BookManager manager;
@PostMapping("/book")
public Book create(@RequestParam String author) {
return manager.create(author);
}
}

18
spring-core-3/src/main/java/com/baeldung/spring/patterns/proxy/BookManager.java Normal file
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package com.baeldung.spring.patterns.proxy;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service
public class BookManager {
@Autowired
private BookRepository repository;
@Transactional
public Book create(String author) {
System.out.println(repository.getClass().getName());
return repository.create(author);
}
}

11
spring-core-3/src/main/java/com/baeldung/spring/patterns/proxy/BookRepository.java Normal file
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package com.baeldung.spring.patterns.proxy;
import org.springframework.stereotype.Repository;
@Repository
public class BookRepository {
public Book create(String author) {
return new Book(author);
}
}

12
spring-core-3/src/main/java/com/baeldung/spring/patterns/singleton/Application.java Normal file
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package com.baeldung.spring.patterns.singleton;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}

4
spring-core-3/src/main/java/com/baeldung/spring/patterns/singleton/Book.java Normal file
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package com.baeldung.spring.patterns.singleton;
public class Book {
}

19
spring-core-3/src/main/java/com/baeldung/spring/patterns/singleton/BookController.java Normal file
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package com.baeldung.spring.patterns.singleton;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class BookController {
@Autowired
private BookRepository repository;
@GetMapping("/book/{id}")
public Book findById(@PathVariable long id) {
System.out.println(repository);
return repository.findById(id).get();
}
}

17
spring-core-3/src/main/java/com/baeldung/spring/patterns/singleton/BookRepository.java Normal file
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package com.baeldung.spring.patterns.singleton;
import java.util.Optional;
import org.springframework.stereotype.Repository;
@Repository
public class BookRepository {
public long count() {
return 1;
}
public Optional<Book> findById(long id) {
return Optional.of(new Book());
}
}

18
spring-core-3/src/main/java/com/baeldung/spring/patterns/singleton/LibraryController.java Normal file
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package com.baeldung.spring.patterns.singleton;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class LibraryController {
@Autowired
private BookRepository repository;
@GetMapping("/count")
public Long findCount() {
System.out.println(repository);
return repository.count();
}
}

32
spring-core-3/src/main/java/com/baeldung/spring/patterns/template/Book.java Normal file
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package com.baeldung.spring.patterns.template;
public class Book {
private long id;
private String title;
private String author;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
}

21
spring-core-3/src/main/java/com/baeldung/spring/patterns/template/BookRowMapper.java Normal file
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package com.baeldung.spring.patterns.template;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
public class BookRowMapper implements RowMapper<Book> {
@Override
public Book mapRow(ResultSet rs, int rowNum) throws SQLException {
Book book = new Book();
book.setId(rs.getLong("id"));
book.setTitle(rs.getString("title"));
book.setAuthor(rs.getString("author"));
return book;
}
}

36
spring-core-3/src/test/java/com/baeldung/spring/patterns/factory/AnnotationConfigApplicationContextUnitTest.java Normal file
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package com.baeldung.spring.patterns.factory;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class AnnotationConfigApplicationContextUnitTest {
@Test
@SuppressWarnings("resource")
public void whenGetSimpleBean_thenReturnConstructedBean() {
ApplicationContext context = new AnnotationConfigApplicationContext(ApplicationConfig.class);
Foo foo = context.getBean(Foo.class);
assertNotNull(foo);
}
@Test
@SuppressWarnings("resource")
public void whenGetPrototypeBean_thenReturnConstructedBean() {
String expectedName = "Some name";
ApplicationContext context = new AnnotationConfigApplicationContext(ApplicationConfig.class);
Bar bar = context.getBean(Bar.class, expectedName);
assertNotNull(bar);
assertThat(bar.getName(), is(expectedName));
}
}

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spring-core-3/src/test/java/com/baeldung/spring/patterns/factory/ApplicationConfig.java Normal file
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package com.baeldung.spring.patterns.factory;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@ComponentScan(basePackageClasses = ApplicationConfig.class)
public class ApplicationConfig {
}

20
spring-core-3/src/test/java/com/baeldung/spring/patterns/factory/Bar.java Normal file
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package com.baeldung.spring.patterns.factory;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
@Component
@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public class Bar {
private String name;
public Bar(String name) {
this.name = name;
}
public String getName() {
return name;
}
}

36
spring-core-3/src/test/java/com/baeldung/spring/patterns/factory/ClassPathXmlApplicationContextUnitTest.java Normal file
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package com.baeldung.spring.patterns.factory;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class ClassPathXmlApplicationContextUnitTest {
@Test
@SuppressWarnings("resource")
public void givenXmlConfiguration_whenGetSimpleBean_thenReturnConstructedBean() {
ApplicationContext context = new ClassPathXmlApplicationContext("patterns-context.xml");
Foo foo = context.getBean(Foo.class);
assertNotNull(foo);
}
@Test
@SuppressWarnings("resource")
public void givenXmlConfiguration_whenGetPrototypeBean_thenReturnConstructedBean() {
String expectedName = "Some name";
ApplicationContext context = new ClassPathXmlApplicationContext("patterns-context.xml");
Bar bar = context.getBean(Bar.class, expectedName);
assertNotNull(bar);
assertThat(bar.getName(), is(expectedName));
}
}

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spring-core-3/src/test/java/com/baeldung/spring/patterns/factory/Foo.java Normal file
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package com.baeldung.spring.patterns.factory;
import org.springframework.stereotype.Component;
@Component
public class Foo {
}

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spring-core-3/src/test/resources/patterns-context.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="foo" class="com.baeldung.spring.patterns.factory.Foo" />
<bean id="bar" scope="prototype" class="com.baeldung.spring.patterns.factory.Bar" />
</beans>