Merge pull request #413 from lor6/scopes-examples

scopes examples

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

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+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

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

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

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+package org.baeldung.scopes;
+
+import javax.annotation.Resource;
+
+import org.apache.log4j.Logger;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@Controller
+public class ScopesController {
+	public static final Logger LOG = Logger.getLogger(ScopesController.class);
+
+	@Resource(name = "requestMessage")
+	HelloMessageGenerator requestMessage;
+
+	@Resource(name = "sessionMessage")
+	HelloMessageGenerator sessionMessage;
+
+	@RequestMapping("/scopes")
+	public String getScopes(final Model model) {
+		LOG.info("Request Message:" + requestMessage.getMessage());
+		LOG.info("Session Message" + sessionMessage.getMessage());
+		requestMessage.setMessage("Good morning!");
+		sessionMessage.setMessage("Good afternoon!");
+		model.addAttribute("requestMessage", requestMessage.getMessage());
+		model.addAttribute("sessionMessage", sessionMessage.getMessage());
+		return "scopesExample";
+	}
+
+}

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

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+package org.baeldung.spring.config;
+
+import org.baeldung.scopes.HelloMessageGenerator;
+import org.baeldung.scopes.Person;
+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();
+	}
+
+	@Bean
+	@Scope(value = WebApplicationContext.SCOPE_GLOBAL_SESSION, proxyMode = ScopedProxyMode.TARGET_CLASS)
+	public HelloMessageGenerator globalSessionMessage() {
+		return new HelloMessageGenerator();
+	}
+
+	@Bean
+	@Scope("prototype")
+	public Person personPrototype() {
+		return new Person();
+	}
+
+	@Bean
+	@Scope("singleton")
+	public Person personSingleton() {
+		return new Person();
+	}
+}

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

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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.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

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+<html>
+<head></head>
+
+<body>
+    <h1>Bean Scopes Examples</h1>
+    <br>
+ Request Message: ${requestMessage }<br>
+ Session Message: ${sessionMessage }
+</body>
+</html>

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

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+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 String NAME_OTHER = "Anna Jones";
+
+	@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);
+		Assert.assertEquals(NAME, personSingletonB.getName());
+
+		((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);
+		personPrototypeB.setName(NAME_OTHER);
+
+		Assert.assertEquals(NAME, personPrototypeA.getName());
+		Assert.assertEquals(NAME_OTHER, personPrototypeB.getName());
+
+		((AbstractApplicationContext) applicationContext).close();
+	}
+
+}