scopes examples

spring-all/src/main/java/org/baeldung/scopes/HelloMessageGenerator.java

@@ -0,0 +1,15 @@
+package org.baeldung.scopes;
+
+public class HelloMessageGenerator {
+
+	private String message;
+
+	public String getMessage() {
+		return message;
+	}
+
+	public void setMessage(final String message) {
+		this.message = message;
+	}
+
+}

spring-all/src/main/java/org/baeldung/scopes/Person.java

@@ -0,0 +1,37 @@
+package org.baeldung.scopes;
+
+public class Person {
+	private String name;
+	private int age;
+
+	public Person() {
+	}
+
+	public Person(final String name, final int age) {
+		super();
+		this.name = name;
+		this.age = age;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(final String name) {
+		this.name = name;
+	}
+
+	public int getAge() {
+		return age;
+	}
+
+	public void setAge(final int age) {
+		this.age = age;
+	}
+
+	@Override
+	public String toString() {
+		return "Person [name=" + name + ", age=" + age + "]";
+	}
+
+}

spring-all/src/main/java/org/baeldung/scopes/ScopesController.java

@@ -0,0 +1,46 @@
+package org.baeldung.scopes;
+
+import javax.annotation.Resource;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@Controller
+public class ScopesController {
+
+	@Resource(name = "requestMessage")
+	HelloMessageGenerator firstRequestMessage;
+
+	@Resource(name = "requestMessage")
+	HelloMessageGenerator secondRequestMessage;
+
+	@Resource(name = "sessionMessage")
+	HelloMessageGenerator firstSessionMessage;
+
+	@Resource(name = "sessionMessage")
+	HelloMessageGenerator secondSessionMessage;
+
+	@RequestMapping("/scopes")
+	public String getScopes() {
+		return "scopesExample";
+	}
+
+	@RequestMapping("/scopes/firstRequest")
+	public String getFirstRequest(final Model model) {
+		firstRequestMessage.setMessage("Good morning!");
+		firstSessionMessage.setMessage("Good afternoon!");
+		model.addAttribute("requestMessage", firstRequestMessage.getMessage());
+		model.addAttribute("sessionMessage", firstSessionMessage.getMessage());
+		return "scopesFirstRequest";
+	}
+
+	@RequestMapping("/scopes/secondRequest")
+	public String getSecondRequest(final Model model) {
+		secondRequestMessage.setMessage("Good evening!");
+		model.addAttribute("requestMessage", secondRequestMessage.getMessage());
+		model.addAttribute("sessionMessage", secondSessionMessage.getMessage());
+		return "scopesSecondRequest";
+	}
+
+}

spring-all/src/main/java/org/baeldung/spring/config/ScopesConfig.java

@@ -0,0 +1,39 @@
+package org.baeldung.spring.config;
+
+import org.baeldung.scopes.HelloMessageGenerator;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Scope;
+import org.springframework.context.annotation.ScopedProxyMode;
+import org.springframework.web.context.WebApplicationContext;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.view.JstlView;
+import org.springframework.web.servlet.view.UrlBasedViewResolver;
+
+@Configuration
+@ComponentScan("org.baeldung.scopes")
+@EnableWebMvc
+public class ScopesConfig {
+	@Bean
+	public UrlBasedViewResolver setupViewResolver() {
+		final UrlBasedViewResolver resolver = new UrlBasedViewResolver();
+		resolver.setPrefix("/WEB-INF/view/");
+		resolver.setSuffix(".jsp");
+		resolver.setViewClass(JstlView.class);
+		return resolver;
+	}
+
+	@Bean
+	@Scope(value = WebApplicationContext.SCOPE_REQUEST, proxyMode = ScopedProxyMode.TARGET_CLASS)
+	public HelloMessageGenerator requestMessage() {
+		return new HelloMessageGenerator();
+	}
+
+	@Bean
+	@Scope(value = WebApplicationContext.SCOPE_SESSION, proxyMode = ScopedProxyMode.TARGET_CLASS)
+	public HelloMessageGenerator sessionMessage() {
+		return new HelloMessageGenerator();
+	}
+
+}

spring-all/src/main/resources/scopes.xml

@@ -0,0 +1,10 @@
+<?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.xsd">
+
+    <bean id="personSingleton" class="org.baeldung.scopes.Person" scope="singleton"/>
+    
+    <bean id="personPrototype" class="org.baeldung.scopes.Person" scope="prototype"/>
+    
+</beans>

spring-all/src/main/webapp/WEB-INF/view/scopesExample.jsp

@@ -0,0 +1,10 @@
+<html>
+<head></head>
+
+<body>
+    <h1>Bean Scopes Examples</h1>
+    <br>
+   <a href="${pageContext.request.contextPath}/scopes/firstRequest">First Request</a><br><br>
+    <a href="${pageContext.request.contextPath}/scopes/secondRequest">Second Request</a>
+</body>
+</html>

spring-all/src/main/webapp/WEB-INF/view/scopesFirstRequest.jsp

@@ -0,0 +1,11 @@
+<html>
+<head></head>
+
+<body>
+    <h1>Bean Scopes First Request</h1>
+    
+    Request bean message: ${requestMessage }
+    Session bean message: ${sessionMessage }
+    
+</body>
+</html>

spring-all/src/main/webapp/WEB-INF/view/scopesSecondRequest.jsp

@@ -0,0 +1,10 @@
+<html>
+<head></head>
+
+<body>
+    <h1>Bean Scopes Second Request</h1>
+    
+    Request bean message: ${requestMessage }
+    Session bean message: ${sessionMessage }
+</body>
+</html>

spring-all/src/test/java/org/baeldung/scopes/ScopesTest.java

@@ -0,0 +1,52 @@
+package org.baeldung.scopes;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.support.AbstractApplicationContext;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+public class ScopesTest {
+
+	private static final String NAME = "John Smith";
+	private static final int AGE = 30;
+
+	private static final String NAME_OTHER = "Anna Jones";
+	private static final int AGE_OTHER = 40;
+
+	@Test
+	public void testScopeSingleton() {
+		final ApplicationContext applicationContext = new ClassPathXmlApplicationContext("scopes.xml");
+
+		final Person personSingletonA = (Person) applicationContext.getBean("personSingleton");
+		final Person personSingletonB = (Person) applicationContext.getBean("personSingleton");
+
+		personSingletonA.setName(NAME);
+		personSingletonB.setAge(AGE);
+
+		Assert.assertEquals(NAME, personSingletonB.getName());
+		Assert.assertEquals(AGE, personSingletonB.getAge());
+
+		((AbstractApplicationContext) applicationContext).close();
+	}
+
+	@Test
+	public void testScopePrototype() {
+		final ApplicationContext applicationContext = new ClassPathXmlApplicationContext("scopes.xml");
+
+		final Person personPrototypeA = (Person) applicationContext.getBean("personPrototype");
+		final Person personPrototypeB = (Person) applicationContext.getBean("personPrototype");
+
+		personPrototypeA.setName(NAME);
+		personPrototypeA.setAge(AGE);
+
+		personPrototypeB.setName(NAME_OTHER);
+		personPrototypeB.setAge(AGE_OTHER);
+
+		Assert.assertEquals(NAME, personPrototypeA.getName());
+		Assert.assertEquals(NAME_OTHER, personPrototypeB.getName());
+
+		((AbstractApplicationContext) applicationContext).close();
+	}
+
+}