Merge pull request #8125 from eugenp/revert-8119-BAEL-3275-2

Revert "BAEL-3275: Using blocking queue for pub-sub"

spring-core/.gitignore

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+RemoteSystemsTempFiles/
+.classpath
+.project
+.settings/
+bin/
+.metadata/
+docs/*.autosave
+.recommenders/
+build/
+.gradle/
+.DS_Store
+.idea/

spring-core/README.md

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+## Spring Core
+
+This module contains articles about core Spring functionality
+
+### Relevant Articles:
+- [Wiring in Spring: @Autowired, @Resource and @Inject](https://www.baeldung.com/spring-annotations-resource-inject-autowire)
+- [Constructor Injection in Spring with Lombok](https://www.baeldung.com/spring-injection-lombok)
+- [Introduction to Spring’s StreamUtils](https://www.baeldung.com/spring-stream-utils)
+- [XML-Based Injection in Spring](https://www.baeldung.com/spring-xml-injection)
+- [A Quick Guide to the Spring @Lazy Annotation](https://www.baeldung.com/spring-lazy-annotation)
+- [BeanNameAware and BeanFactoryAware Interfaces in Spring](https://www.baeldung.com/spring-bean-name-factory-aware)
+- [Access a File from the Classpath in a Spring Application](https://www.baeldung.com/spring-classpath-file-access)
+- [Spring Application Context Events](https://www.baeldung.com/spring-context-events)
+- [What is a Spring Bean?](https://www.baeldung.com/spring-bean)
+- [Spring PostConstruct and PreDestroy Annotations](https://www.baeldung.com/spring-postconstruct-predestroy)
+- More articles: [[next -->]](/spring-core-2)
+

spring-core/pom.xml

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+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+    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>
+    <groupId>com.baeldung</groupId>
+    <artifactId>spring-core</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>spring-core</name>
+    <packaging>war</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-spring-5</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-spring-5</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <version>${spring.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-beans</artifactId>
+            <version>${spring.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context</artifactId>
+            <version>${spring.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.inject</groupId>
+            <artifactId>javax.inject</artifactId>
+            <version>${javax.inject.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>${lombok.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+            <version>${spring-boot.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-test</artifactId>
+            <version>${mockito.spring.boot.version}</version>
+            <scope>test</scope>
+        </dependency>
+         <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>${commons.io.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-war-plugin</artifactId>
+                <version>${maven-war-plugin.version}</version>
+                <configuration>
+                    <failOnMissingWebXml>false</failOnMissingWebXml>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <mockito.spring.boot.version>1.4.4.RELEASE</mockito.spring.boot.version>
+        <javax.inject.version>1</javax.inject.version>
+        <guava.version>20.0</guava.version>
+        <commons.io.version>2.5</commons.io.version>
+        <spring-boot.version>1.5.2.RELEASE</spring-boot.version>
+        <mockito.version>1.10.19</mockito.version>
+        <assertj.version>3.12.2</assertj.version>
+    </properties>
+
+</project>

spring-core/src/main/java/com/baeldung/Ebook.java

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+package com.baeldung;
+
+public class Ebook {
+
+    private int bookId;
+    private String bookTitle;
+    
+    public int getBookId() {
+        return bookId;
+    }
+    public void setBookId(int bookId) {
+        this.bookId = bookId;
+    }
+    public String getBookTitle() {
+        return bookTitle;
+    }
+    public void setBookTitle(String bookTitle) {
+        this.bookTitle = bookTitle;
+    }
+}

spring-core/src/main/java/com/baeldung/EbookRepository.java

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+package com.baeldung;
+
+public interface EbookRepository {
+    String titleById(int id);
+}

spring-core/src/main/java/com/baeldung/LibraryUtils.java

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+package com.baeldung;
+
+import org.springframework.beans.factory.annotation.Autowired;
+
+public class LibraryUtils {
+    @Autowired
+    private EbookRepository eBookRepository;
+ 
+    public String findBook(int id) {
+        return eBookRepository.titleById(id);
+    }
+}

spring-core/src/main/java/com/baeldung/Member.java

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+package com.baeldung;
+
+public class Member {
+
+    private int memberId;
+    private String memberName;
+    
+    public int getMemberId() {
+        return memberId;
+    }
+    public void setMemberId(int memberId) {
+        this.memberId = memberId;
+    }
+    public String getMemberName() {
+        return memberName;
+    }
+    public void setMemberName(String memberName) {
+        this.memberName = memberName;
+    }
+}

spring-core/src/main/java/com/baeldung/Reservation.java

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+package com.baeldung;
+
+import org.springframework.beans.factory.annotation.Autowired;
+
+public class Reservation {
+    private Member member;
+    private Ebook eBook;
+    
+    @Autowired
+    public Reservation(Member member, Ebook eBook) {
+        this.member = member;
+        this.eBook = eBook;
+    }  
+}

spring-core/src/main/java/com/baeldung/annotation/MyBean.java

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+package com.baeldung.annotation;
+
+import org.springframework.stereotype.Component;
+import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+
+@Component
+public class MyBean {
+
+    private final TestBean testBean;
+
+    public MyBean(TestBean testBean) {
+        this.testBean = testBean;
+        System.out.println("Hello from constructor");
+    }
+
+    @PostConstruct
+    private void postConstruct() {
+        System.out.println("Hello from @PostConstruct method");
+    }
+
+    @PreDestroy
+    public void preDestroy() {
+        System.out.println("Bean is being destroyed");
+    }
+}

spring-core/src/main/java/com/baeldung/annotation/TestBean.java

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+package com.baeldung.annotation;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class TestBean {
+
+}

spring-core/src/main/java/com/baeldung/applicationcontext/Course.java

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+package com.baeldung.applicationcontext;
+
+public class Course {
+
+    private String name;
+
+    public Course() {
+    }
+
+    public Course(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

spring-core/src/main/java/com/baeldung/applicationcontext/Dialog.java

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+package com.baeldung.applicationcontext;
+
+import java.util.Locale;
+
+public class Dialog {
+
+    private Locale locale;
+    private String hello;
+    private String thanks;
+
+    public Dialog() {
+    }
+
+    public Dialog(Locale locale, String hello, String thanks) {
+        this.locale = locale;
+        this.hello = hello;
+        this.thanks = thanks;
+    }
+
+    public Locale getLocale() {
+        return locale;
+    }
+
+    public void setLocale(Locale locale) {
+        this.locale = locale;
+    }
+
+    public String getHello() {
+        return hello;
+    }
+
+    public void setHello(String hello) {
+        this.hello = hello;
+    }
+
+    public String getThanks() {
+        return thanks;
+    }
+
+    public void setThanks(String thanks) {
+        this.thanks = thanks;
+    }
+}

spring-core/src/main/java/com/baeldung/applicationcontext/Student.java

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+package com.baeldung.applicationcontext;
+
+public class Student {
+
+    private int no;
+    private String name;
+
+    public Student() {
+    }
+
+    public Student(int no, String name) {
+        this.no = no;
+        this.name = name;
+    }
+
+    public int getNo() {
+        return no;
+    }
+
+    public void setNo(int no) {
+        this.no = no;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void destroy() {
+        System.out.println("Student(no: " + no + ") is destroyed");
+    }
+}

spring-core/src/main/java/com/baeldung/applicationcontext/Teacher.java

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+package com.baeldung.applicationcontext;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.annotation.PostConstruct;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+
+public class Teacher {
+
+    @Autowired
+    private ApplicationContext context;
+    private List<Course> courses = new ArrayList<>();
+
+    public Teacher() {
+    }
+
+    @PostConstruct
+    public void addCourse() {
+        if (context.containsBean("math")) {
+            Course math = context.getBean("math", Course.class);
+            courses.add(math);
+        }
+        if (context.containsBean("physics")) {
+            Course physics = context.getBean("physics", Course.class);
+            courses.add(physics);
+        }
+    }
+
+    public List<Course> getCourses() {
+        return courses;
+    }
+
+    public void setCourses(List<Course> courses) {
+        this.courses = courses;
+    }
+}

spring-core/src/main/java/com/baeldung/aware/AwareExample.java

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+package com.baeldung.aware;
+
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+/**
+ * Created by Gebruiker on 4/24/2018.
+ */
+public class AwareExample {
+
+    public static void main(String[] args) {
+
+        AnnotationConfigApplicationContext context
+                = new AnnotationConfigApplicationContext(Config.class);
+
+        MyBeanName myBeanName = context.getBean(MyBeanName.class);
+
+        MyBeanFactory myBeanFactory = context.getBean(MyBeanFactory.class);
+        myBeanFactory.getMyBeanName();
+    }
+}

spring-core/src/main/java/com/baeldung/aware/Config.java

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+package com.baeldung.aware;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class Config {
+
+    @Bean(name = "myCustomBeanName")
+    public MyBeanName getMyBeanName() {
+        return new MyBeanName();
+    }
+
+    @Bean
+    public MyBeanFactory getMyBeanFactory() {
+        return new MyBeanFactory();
+    }
+}

spring-core/src/main/java/com/baeldung/aware/MyBeanFactory.java

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+package com.baeldung.aware;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.BeanFactory;
+import org.springframework.beans.factory.BeanFactoryAware;
+
+/**
+ * Created by Gebruiker on 4/25/2018.
+ */
+public class MyBeanFactory implements BeanFactoryAware {
+
+    private BeanFactory beanFactory;
+
+    @Override
+    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
+        this.beanFactory = beanFactory;
+    }
+
+    public void getMyBeanName() {
+        MyBeanName myBeanName = beanFactory.getBean(MyBeanName.class);
+        System.out.println(beanFactory.isSingleton("myCustomBeanName"));
+    }
+
+}

spring-core/src/main/java/com/baeldung/aware/MyBeanName.java

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+package com.baeldung.aware;
+
+import org.springframework.beans.factory.BeanNameAware;
+
+public class MyBeanName implements BeanNameAware {
+
+    @Override
+    public void setBeanName(String beanName) {
+        System.out.println(beanName);
+    }
+}

spring-core/src/main/java/com/baeldung/config/scope/AppConfigFunctionBean.java

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+package com.baeldung.config.scope;
+
+import java.util.function.Function;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Scope;
+
+import com.baeldung.scope.prototype.PrototypeBean;
+import com.baeldung.scope.singletone.SingletonFunctionBean;
+
+@Configuration
+public class AppConfigFunctionBean {
+
+    @Bean
+    public Function<String, PrototypeBean> beanFactory() {
+        return name -> prototypeBeanWithParam(name);
+    } 
+
+    @Bean
+    @Scope(value = "prototype")
+    public PrototypeBean prototypeBeanWithParam(String name) {
+       return new PrototypeBean(name);
+    }
+    
+    @Bean
+    public SingletonFunctionBean singletonFunctionBean() {
+        return new SingletonFunctionBean();
+    }
+    
+}

spring-core/src/main/java/com/baeldung/event/listener/ContextEventListener.java

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+package com.baeldung.event.listener;
+
+import org.springframework.context.event.ContextStartedEvent;
+import org.springframework.context.event.ContextStoppedEvent;
+import org.springframework.context.event.EventListener;
+import org.springframework.core.annotation.Order;
+import org.springframework.stereotype.Component;
+
+@Component
+public class ContextEventListener {
+
+    @Order(2)
+    @EventListener
+    public void handleContextRefreshEvent(ContextStartedEvent ctxStartEvt) {
+        System.out.println("Context Start Event received.");
+    }
+
+    @Order(1)
+    @EventListener(classes = { ContextStartedEvent.class, ContextStoppedEvent.class })
+    public void handleMultipleEvents() {
+        System.out.println("Multi-event listener invoked");
+    }
+
+}

spring-core/src/main/java/com/baeldung/event/listener/EventConfig.java

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+package com.baeldung.event.listener;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ComponentScan(basePackages = "com.baeldung.event.listener")
+public class EventConfig {
+
+}

spring-core/src/main/java/com/baeldung/event/listener/SpringRunner.java

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+package com.baeldung.event.listener;
+
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+public class SpringRunner {
+
+    public static void main(String[] args) {
+        ConfigurableApplicationContext ctx = new AnnotationConfigApplicationContext(EventConfig.class);
+        ctx.start();
+    }
+}

spring-core/src/main/java/com/baeldung/lazy/AppConfig.java

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+package com.baeldung.lazy;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Lazy;
+
+@Lazy
+@Configuration
+@ComponentScan(basePackages = "com.baeldung.lazy")
+public class AppConfig {
+
+    @Lazy
+    @Bean
+    public Region getRegion(){
+        return new Region();
+    }
+
+    @Bean
+    public Country getCountry(){
+        return new Country();
+    }
+}

spring-core/src/main/java/com/baeldung/lazy/City.java

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+package com.baeldung.lazy;
+
+import org.springframework.context.annotation.Lazy;
+import org.springframework.stereotype.Component;
+
+@Lazy
+@Component
+public class City {
+
+    public City() {
+        System.out.println("City bean initialized");
+    }
+}

spring-core/src/main/java/com/baeldung/lazy/Country.java

@@ -0,0 +1,8 @@
+package com.baeldung.lazy;
+
+public class Country {
+
+    public Country() {
+        System.out.println("Country bean initialized");
+    }
+}

spring-core/src/main/java/com/baeldung/lazy/Region.java

@@ -0,0 +1,19 @@
+package com.baeldung.lazy;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Lazy;
+
+public class Region {
+
+    @Lazy
+    @Autowired
+    private City city;
+
+    public Region() {
+        System.out.println("Region bean initialized");
+    }
+
+    public City getCityInstance() {
+        return city;
+    }
+}

spring-core/src/main/java/com/baeldung/lombok/ApologizeService.java

@@ -0,0 +1,22 @@
+package com.baeldung.lombok;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class ApologizeService {
+
+    private final Translator translator;
+    private final String message;
+
+    @Autowired
+    public ApologizeService(Translator translator) {
+        this(translator, "sorry");
+    }
+
+    public String apologize() {
+        return translator.translate(message);
+    }
+}

spring-core/src/main/java/com/baeldung/lombok/FarewellService.java

@@ -0,0 +1,18 @@
+package com.baeldung.lombok;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class FarewellService {
+
+    private final Translator translator;
+
+    public FarewellService(Translator translator) {
+        this.translator = translator;
+    }
+
+    public String farewell() {
+        return translator.translate("bye");
+    }
+}

spring-core/src/main/java/com/baeldung/lombok/GreetingService.java

@@ -0,0 +1,15 @@
+package com.baeldung.lombok;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class GreetingService {
+
+    @Autowired
+    private Translator translator;
+
+    public String greet() {
+        return translator.translate("hello");
+    }
+}

spring-core/src/main/java/com/baeldung/lombok/ThankingService.java

@@ -0,0 +1,15 @@
+package com.baeldung.lombok;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class ThankingService {
+
+    private final Translator translator;
+
+    public String thank() {
+        return translator.translate("thank you");
+    }
+}