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GP-67 Add legacy exercise
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‎3-0-spring-framework/3-0-0-hello-spring-framework/README.MD‎

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# <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=50/>Hello ApplicationContext exercise :muscle:
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Improve your *Spring ApplicationContext* Java configuration skills
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### Task
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The task is to **configure `ApplicationContext`** that contains `AccountService` bean, `AccountDao` bean
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and `TestDataGenerator` bean. Your job is to follow the instructions in the *todo* section and **implement
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a proper configuration.**
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To verify your configuration, run `AppConfigTest.java`
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### Pre-conditions :heavy_exclamation_mark:
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You're supposed to be familiar with *Spring IoC* and *Dependency injection*
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### How to start :question:
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* Just clone the repository and start implementing the **todo** section, verify your changes by running tests
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* If you don't have enough knowledge about this domain, check out the [links below](#related-materials-information_source)
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* Don't worry if you got stuck, checkout the **exercise/completed** branch and see the final implementation
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### Related materials :information_source:
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* [Spring IoC basics tutorial](https://github.com/boy4uck/spring-framework-tutorial/tree/master/spring-framework-ioc-basics)<img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=20/>
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‎3-0-spring-framework/3-0-0-hello-spring-framework/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>3-0-spring-framework</artifactId>
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<groupId>com.bobocode</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>3-0-0-hello-spring-framework</artifactId>
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<dependencies>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-context</artifactId>
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<version>5.0.7.RELEASE</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-test</artifactId>
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<version>5.0.7.RELEASE</version>
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</dependency>
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<dependency>
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<groupId>org.hamcrest</groupId>
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<artifactId>hamcrest-all</artifactId>
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<version>1.3</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.bobocode</groupId>
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<artifactId>spring-framework-exercises-util</artifactId>
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<version>1.0-SNAPSHOT</version>
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</dependency>
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</dependencies>
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</project>

‎3-0-spring-framework/3-0-0-hello-spring-framework/src/main/java/com/bobocode/config/AppConfig.java‎

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package com.bobocode.config;
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import com.bobocode.TestDataGenerator;
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/**
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* This class application context configuration.
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* <p>
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* todo: make this class a Spring configuration class
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* todo: enable component scanning for dao and service packages
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* todo: provide explicit configuration for a bean of type {@link TestDataGenerator} with name "dataGenerator" in this class.
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* todo: Don't specify bean name "dataGenerator" explicitly
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*/
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public class AppConfig {
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}

‎3-0-spring-framework/3-0-0-hello-spring-framework/src/main/java/com/bobocode/dao/AccountDao.java‎

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package com.bobocode.dao;
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import com.bobocode.model.Account;
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import java.util.List;
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/**
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* Defines an API for {@link Account} data access object (DAO).
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*/
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public interface AccountDao {
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List<Account> findAll();
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}

‎3-0-spring-framework/3-0-0-hello-spring-framework/src/main/java/com/bobocode/dao/FakeAccountDao.java‎

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package com.bobocode.dao;
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import com.bobocode.TestDataGenerator;
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import com.bobocode.model.Account;
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import org.springframework.beans.factory.annotation.Autowired;
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import java.util.List;
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import java.util.stream.Stream;
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import static java.util.stream.Collectors.toList;
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/**
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* Provides a fake {@link AccountDao} implementation that uses generated fake data.
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* <p>
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* todo: configure this class as Spring component with bean name "accountDao"
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* todo: use explicit (with {@link Autowired} annotation) constructor-based dependency injection
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*/
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public class FakeAccountDao implements AccountDao {
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private List<Account> accounts;
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public FakeAccountDao(TestDataGenerator testDataGenerator) {
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this.accounts = Stream.generate(testDataGenerator::generateAccount)
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.limit(20)
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.collect(toList());
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}
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@Override
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public List<Account> findAll() {
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return accounts;
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}
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}

‎3-0-spring-framework/3-0-0-hello-spring-framework/src/main/java/com/bobocode/service/AccountService.java‎

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package com.bobocode.service;
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import com.bobocode.dao.AccountDao;
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import com.bobocode.model.Account;
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import java.util.Comparator;
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import java.util.List;
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/**
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* Provides service API for {@link Account}.
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* <p>
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* todo: configure {@link AccountService} bean implicitly using special annotation for service classes
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* todo: use implicit constructor-based dependency injection (don't use {@link org.springframework.beans.factory.annotation.Autowired})
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*/
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public class AccountService {
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private final AccountDao accountDao;
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public AccountService(AccountDao accountDao) {
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this.accountDao = accountDao;
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}
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public Account findRichestAccount() {
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List<Account> accounts = accountDao.findAll();
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return accounts.stream()
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.max(Comparator.comparing(Account::getBalance))
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.get();
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}
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}

‎3-0-spring-framework/3-0-0-hello-spring-framework/src/test/java/com/bobocode/AppConfigTest.java‎

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package com.bobocode;
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import com.bobocode.config.AppConfig;
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import com.bobocode.dao.AccountDao;
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import com.bobocode.dao.FakeAccountDao;
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import com.bobocode.model.Account;
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import com.bobocode.service.AccountService;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.stereotype.Component;
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import org.springframework.stereotype.Service;
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import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
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import java.lang.annotation.Annotation;
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import java.lang.reflect.Method;
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import java.util.Comparator;
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import java.util.Map;
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import static org.hamcrest.MatcherAssert.assertThat;
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import static org.hamcrest.Matchers.arrayContainingInAnyOrder;
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import static org.hamcrest.Matchers.arrayWithSize;
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import static org.hamcrest.Matchers.equalTo;
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import static org.hamcrest.Matchers.hasItem;
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import static org.hamcrest.Matchers.is;
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import static org.hamcrest.Matchers.notNullValue;
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@SpringJUnitConfig
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class AppConfigTest {
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@Configuration
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@ComponentScan(basePackages = "com.bobocode")
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static class TestConfig {
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}
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@Autowired
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private ApplicationContext applicationContext;
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@Autowired
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private AccountService accountService;
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@Autowired
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private AccountDao accountDao;
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@Test
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void testConfigClassIsMarkedAsConfiguration() {
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Configuration configuration = AppConfig.class.getAnnotation(Configuration.class);
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assertThat(configuration, notNullValue());
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}
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@Test
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void testComponentScanIsEnabled() {
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ComponentScan componentScan = AppConfig.class.getAnnotation(ComponentScan.class);
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assertThat(componentScan, notNullValue());
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}
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@Test
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void testComponentScanPackagesAreSpecified() {
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ComponentScan componentScan = AppConfig.class.getAnnotation(ComponentScan.class);
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String[] packages = componentScan.basePackages();
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if (packages.length == 0) {
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packages = componentScan.value();
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}
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assertThat(packages, arrayContainingInAnyOrder("com.bobocode.dao", "com.bobocode.service"));
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}
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@Test
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void testDataGeneratorHasOnlyOneBean() {
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Map<String, TestDataGenerator> testDataGeneratorMap = applicationContext.getBeansOfType(TestDataGenerator.class);
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assertThat(testDataGeneratorMap.size(), is(1));
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}
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@Test
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void testDataGeneratorBeanIsConfiguredExplicitly() {
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Method[] methods = AppConfig.class.getMethods();
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Method testDataGeneratorBeanMethod = findTestDataGeneratorBeanMethod(methods);
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assertThat(testDataGeneratorBeanMethod, notNullValue());
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}
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@Test
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void testDataGeneratorBeanName() {
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Map<String, TestDataGenerator> dataGeneratorBeanMap = applicationContext.getBeansOfType(TestDataGenerator.class);
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assertThat(dataGeneratorBeanMap.keySet(), hasItem("dataGenerator"));
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}
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@Test
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void testDataGeneratorBeanNameIsNotSpecifiedExplicitly() {
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Method[] methods = AppConfig.class.getMethods();
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Method testDataGeneratorBeanMethod = findTestDataGeneratorBeanMethod(methods);
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Bean bean = testDataGeneratorBeanMethod.getDeclaredAnnotation(Bean.class);
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assertThat(bean.name(), arrayWithSize(0));
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assertThat(bean.value(), arrayWithSize(0));
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}
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private Method findTestDataGeneratorBeanMethod(Method[] methods) {
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for (Method method : methods) {
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if (method.getReturnType().equals(TestDataGenerator.class)
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&& method.getDeclaredAnnotation(Bean.class) != null) {
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return method;
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}
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}
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return null;
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}
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@Test
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void testFakeAccountDaoIsConfiguredAsComponent() {
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Component component = FakeAccountDao.class.getAnnotation(Component.class);
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assertThat(component, notNullValue());
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}
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@Test
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void testAccountDaoHasOnlyOneBean() {
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Map<String, AccountDao> accountDaoBeanMap = applicationContext.getBeansOfType(AccountDao.class);
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assertThat(accountDaoBeanMap.size(), is(1));
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}
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@Test
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void testAccountDaoBeanName() {
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Map<String, AccountDao> accountDaoBeanMap = applicationContext.getBeansOfType(AccountDao.class);
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assertThat(accountDaoBeanMap.keySet(), hasItem("accountDao"));
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}
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@Test
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void testAccountDaoConstructorIsMarkedWithAutowired() throws NoSuchMethodException {
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Autowired autowired = FakeAccountDao.class.getConstructor(TestDataGenerator.class).getAnnotation(Autowired.class);
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assertThat(autowired, notNullValue());
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}
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@Test
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void testAccountServiceHasOnlyOneBean() {
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Map<String, AccountService> accountServiceMap = applicationContext.getBeansOfType(AccountService.class);
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assertThat(accountServiceMap.size(), is(1));
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}
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@Test
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void testAccountServiceIsConfiguredAsService() {
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Service service = AccountService.class.getAnnotation(Service.class);
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assertThat(service, notNullValue());
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}
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@Test
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void testAccountServiceBeanName() {
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Map<String, AccountService> accountServiceMap = applicationContext.getBeansOfType(AccountService.class);
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assertThat(accountServiceMap.keySet(), hasItem("accountService"));
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}
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@Test
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void testAccountServiceBeanNameIsNotSpecifiedExplicitly() {
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Service service = AccountService.class.getAnnotation(Service.class);
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assertThat(service.value(), equalTo(""));
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}
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@Test
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void testAccountServiceDoesNotUseAutowired() throws NoSuchMethodException {
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Annotation[] annotations = AccountService.class.getConstructor(AccountDao.class).getDeclaredAnnotations();
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assertThat(annotations, arrayWithSize(0));
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}
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@Test
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void testFindRichestAccount() {
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Account richestAccount = accountService.findRichestAccount();
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Account actualRichestAccount = accountDao.findAll().stream().max(Comparator.comparing(Account::getBalance)).get();
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assertThat(richestAccount, equalTo(actualRichestAccount));
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}
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}

‎3-0-spring-framework/pom.xml‎

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<packaging>pom</packaging>
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<modules>
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<module>3-0-0-hello-spring-framework</module>
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<module>3-0-1-hello-spring-mvc</module>
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</modules>
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‎java-web-course-util/pom.xml‎

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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<packaging>pom</packaging>
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<artifactId>java-web-course-util</artifactId>
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<modules>
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<module>spring-framework-exercises-model</module>
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<module>spring-framework-exercises-util</module>
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</modules>
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</project>

‎java-web-course-util/spring-framework-exercises-model/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>java-web-course-util</artifactId>
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<groupId>com.bobocode</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<packaging>pom</packaging>
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<artifactId>spring-framework-exercises-model</artifactId>
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<dependencies>
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<dependency>
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<groupId>org.hibernate.javax.persistence</groupId>
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<artifactId>hibernate-jpa-2.1-api</artifactId>
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<version>1.0.2.Final</version>
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</dependency>
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</dependencies>
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</project>

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