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Merge pull request #45 from eugenp/master

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Maiklins
2020-04-15 21:36:24 +02:00
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parent f7522a1bb9 23099cff16
commit 13ce413ed2
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algorithms-miscellaneous-6/README.md
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### Relevant Articles:
- [Boruvka’s Algorithm for Minimum Spanning Trees](https://www.baeldung.com/java-boruvka-algorithm)
- [Gradient Descent in Java](https://www.baeldung.com/java-gradient-descent)
atomikos/README.md
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## Atomikos
This module contains articles about Atomikos
### Relevant Articles:
- [Guide Transactions Using Atomikos]()
atomikos/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>atomikos</artifactId>
<name>atomikos</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>com.atomikos</groupId>
<artifactId>transactions-jdbc</artifactId>
<version>${atomikos-version}</version>
</dependency>
<dependency>
<groupId>com.atomikos</groupId>
<artifactId>transactions-jms</artifactId>
<version>${atomikos-version}</version>
</dependency>
<dependency>
<groupId>com.atomikos</groupId>
<artifactId>transactions-hibernate4</artifactId>
<version>${atomikos-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring-version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring-version}</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>1.11.23.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring-version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${hibernate.version}</version>
<scope>provided</scope>
<exclusions>
<exclusion>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-core</artifactId>
<version>5.7.0</version>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
<version>10.8.1.2</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- the JTA API -->
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-jta_1.0.1B_spec</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>2.0.1.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.1.2.Final</version>
</dependency>
<dependency>
<groupId>javax.el</groupId>
<artifactId>javax.el-api</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>javax.el</artifactId>
<version>2.2.4</version>
</dependency>
</dependencies>
<properties>
<atomikos-version>5.0.6</atomikos-version>
<spring-version>5.1.6.RELEASE</spring-version>
<hibernate.version>5.4.3.Final</hibernate.version>
</properties>
</project>
atomikos/src/main/java/com/baeldung/atomikos/direct/Application.java
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package com.baeldung.atomikos.direct;
import java.sql.Connection;
import java.sql.Statement;
import java.util.UUID;
import javax.sql.DataSource;
import com.atomikos.icatch.jta.UserTransactionImp;
public class Application {
private DataSource inventoryDataSource;
private DataSource orderDataSource;
public Application(DataSource inventoryDataSource, DataSource orderDataSource) {
this.inventoryDataSource = inventoryDataSource;
this.orderDataSource = orderDataSource;
}
public void placeOrder(String productId, int amount) throws Exception {
UserTransactionImp utx = new UserTransactionImp();
String orderId = UUID.randomUUID()
.toString();
boolean rollback = false;
try {
utx.begin();
Connection inventoryConnection = inventoryDataSource.getConnection();
Connection orderConnection = orderDataSource.getConnection();
Statement s1 = inventoryConnection.createStatement();
String q1 = "update Inventory set balance = balance - " + amount + " where productId ='" + productId + "'";
s1.executeUpdate(q1);
s1.close();
Statement s2 = orderConnection.createStatement();
String q2 = "insert into Orders values ( '" + orderId + "', '" + productId + "', " + amount + " )";
s2.executeUpdate(q2);
s2.close();
inventoryConnection.close();
orderConnection.close();
} catch (Exception e) {
System.out.println(e.getMessage());
rollback = true;
} finally {
if (!rollback)
utx.commit();
else
utx.rollback();
}
}
}
atomikos/src/main/java/com/baeldung/atomikos/spring/Application.java
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package com.baeldung.atomikos.spring;
import java.sql.Connection;
import java.sql.Statement;
import java.util.UUID;
import javax.sql.DataSource;
import org.springframework.transaction.annotation.Transactional;
public class Application {
private DataSource inventoryDataSource;
private DataSource orderDataSource;
public Application(DataSource inventoryDataSource, DataSource orderDataSource) {
this.inventoryDataSource = inventoryDataSource;
this.orderDataSource = orderDataSource;
}
@Transactional(rollbackFor = Exception.class)
public void placeOrder(String productId, int amount) throws Exception {
String orderId = UUID.randomUUID()
.toString();
Connection inventoryConnection = inventoryDataSource.getConnection();
Connection orderConnection = orderDataSource.getConnection();
Statement s1 = inventoryConnection.createStatement();
String q1 = "update Inventory set balance = balance - " + amount + " where productId ='" + productId + "'";
s1.executeUpdate(q1);
s1.close();
Statement s2 = orderConnection.createStatement();
String q2 = "insert into Orders values ( '" + orderId + "', '" + productId + "', " + amount + " )";
s2.executeUpdate(q2);
s2.close();
inventoryConnection.close();
orderConnection.close();
}
}
atomikos/src/main/java/com/baeldung/atomikos/spring/config/Config.java
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package com.baeldung.atomikos.spring.config;
import java.util.Properties;
import javax.transaction.SystemException;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.jta.JtaTransactionManager;
import com.atomikos.icatch.jta.UserTransactionManager;
import com.atomikos.jdbc.AtomikosDataSourceBean;
import com.baeldung.atomikos.spring.Application;
@Configuration
@EnableTransactionManagement
public class Config {
@Bean(initMethod = "init", destroyMethod = "close")
public AtomikosDataSourceBean inventoryDataSource() {
AtomikosDataSourceBean dataSource = new AtomikosDataSourceBean();
dataSource.setLocalTransactionMode(true);
dataSource.setUniqueResourceName("db1");
dataSource.setXaDataSourceClassName("org.apache.derby.jdbc.EmbeddedXADataSource");
Properties xaProperties = new Properties();
xaProperties.put("databaseName", "db1");
xaProperties.put("createDatabase", "create");
dataSource.setXaProperties(xaProperties);
dataSource.setPoolSize(10);
return dataSource;
}
@Bean(initMethod = "init", destroyMethod = "close")
public AtomikosDataSourceBean orderDataSource() {
AtomikosDataSourceBean dataSource = new AtomikosDataSourceBean();
dataSource.setLocalTransactionMode(true);
dataSource.setUniqueResourceName("db2");
dataSource.setXaDataSourceClassName("org.apache.derby.jdbc.EmbeddedXADataSource");
Properties xaProperties = new Properties();
xaProperties.put("databaseName", "db2");
xaProperties.put("createDatabase", "create");
dataSource.setXaProperties(xaProperties);
dataSource.setPoolSize(10);
return dataSource;
}
@Bean(initMethod = "init", destroyMethod = "close")
public UserTransactionManager userTransactionManager() throws SystemException {
UserTransactionManager userTransactionManager = new UserTransactionManager();
userTransactionManager.setTransactionTimeout(300);
userTransactionManager.setForceShutdown(true);
return userTransactionManager;
}
@Bean
public JtaTransactionManager jtaTransactionManager() throws SystemException {
JtaTransactionManager jtaTransactionManager = new JtaTransactionManager();
jtaTransactionManager.setTransactionManager(userTransactionManager());
jtaTransactionManager.setUserTransaction(userTransactionManager());
return jtaTransactionManager;
}
@Bean
public Application application() {
return new Application(inventoryDataSource(), orderDataSource());
}
}
atomikos/src/main/java/com/baeldung/atomikos/spring/jpa/Application.java
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package com.baeldung.atomikos.spring.jpa;
import java.util.Set;
import java.util.UUID;
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;
import com.baeldung.atomikos.spring.jpa.inventory.Inventory;
import com.baeldung.atomikos.spring.jpa.inventory.InventoryRepository;
import com.baeldung.atomikos.spring.jpa.order.Order;
import com.baeldung.atomikos.spring.jpa.order.OrderRepository;
public class Application {
@Autowired
private InventoryRepository inventoryRepository;
@Autowired
private OrderRepository orderRepository;
@Transactional(rollbackFor = Exception.class)
public void placeOrder(String productId, int amount) throws Exception {
String orderId = UUID.randomUUID()
.toString();
Inventory inventory = inventoryRepository.findOne(productId);
inventory.setBalance(inventory.getBalance() - amount);
inventoryRepository.save(inventory);
Order order = new Order();
order.setOrderId(orderId);
order.setProductId(productId);
order.setAmount(new Long(amount));
ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
Validator validator = factory.getValidator();
Set<ConstraintViolation<Order>> violations = validator.validate(order);
if (violations.size() > 0)
throw new Exception("Invalid instance of an order.");
orderRepository.save(order);
}
}
atomikos/src/main/java/com/baeldung/atomikos/spring/jpa/config/Config.java
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package com.baeldung.atomikos.spring.jpa.config;
import javax.transaction.SystemException;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.jta.JtaTransactionManager;
import com.atomikos.icatch.jta.UserTransactionManager;
import com.baeldung.atomikos.spring.jpa.Application;
@Configuration
@EnableTransactionManagement
public class Config {
@Bean(initMethod = "init", destroyMethod = "close")
public UserTransactionManager userTransactionManager() throws SystemException {
UserTransactionManager userTransactionManager = new UserTransactionManager();
userTransactionManager.setTransactionTimeout(300);
userTransactionManager.setForceShutdown(true);
return userTransactionManager;
}
@Bean
public JtaTransactionManager transactionManager() throws SystemException {
JtaTransactionManager jtaTransactionManager = new JtaTransactionManager();
jtaTransactionManager.setTransactionManager(userTransactionManager());
jtaTransactionManager.setUserTransaction(userTransactionManager());
return jtaTransactionManager;
}
@Bean
public Application application() {
return new Application();
}
}
atomikos/src/main/java/com/baeldung/atomikos/spring/jpa/inventory/Inventory.java
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package com.baeldung.atomikos.spring.jpa.inventory;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "INVENTORY")
public class Inventory {
@Id
private String productId;
private Long balance;
public String getProductId() {
return productId;
}
public void setProductId(String productId) {
this.productId = productId;
}
public Long getBalance() {
return balance;
}
public void setBalance(Long balance) {
this.balance = balance;
}
}
atomikos/src/main/java/com/baeldung/atomikos/spring/jpa/inventory/InventoryConfig.java
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package com.baeldung.atomikos.spring.jpa.inventory;
import java.util.Properties;
import javax.persistence.EntityManagerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import com.atomikos.jdbc.AtomikosDataSourceBean;
@Configuration
@EnableJpaRepositories(basePackages = "com.baeldung.atomikos.spring.jpa.inventory", entityManagerFactoryRef = "inventoryEntityManager", transactionManagerRef = "transactionManager")
public class InventoryConfig {
@Bean(initMethod = "init", destroyMethod = "close")
public AtomikosDataSourceBean inventoryDataSource() {
AtomikosDataSourceBean dataSource = new AtomikosDataSourceBean();
dataSource.setLocalTransactionMode(true);
dataSource.setUniqueResourceName("db1");
dataSource.setXaDataSourceClassName("org.apache.derby.jdbc.EmbeddedXADataSource");
Properties xaProperties = new Properties();
xaProperties.put("databaseName", "db1");
xaProperties.put("createDatabase", "create");
dataSource.setXaProperties(xaProperties);
dataSource.setPoolSize(10);
return dataSource;
}
@Bean
public EntityManagerFactory inventoryEntityManager() {
HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
factory.setJpaVendorAdapter(vendorAdapter);
factory.setPackagesToScan("com.baeldung.atomikos.spring.jpa.inventory");
factory.setDataSource(inventoryDataSource());
Properties jpaProperties = new Properties();
//jpaProperties.put("hibernate.show_sql", "true");
//jpaProperties.put("hibernate.format_sql", "true");
jpaProperties.put("hibernate.dialect", "org.hibernate.dialect.DerbyDialect");
jpaProperties.put("hibernate.current_session_context_class", "jta");
jpaProperties.put("javax.persistence.transactionType", "jta");
jpaProperties.put("hibernate.transaction.manager_lookup_class", "com.atomikos.icatch.jta.hibernate3.TransactionManagerLookup");
jpaProperties.put("hibernate.hbm2ddl.auto", "create-drop");
factory.setJpaProperties(jpaProperties);
factory.afterPropertiesSet();
return factory.getObject();
}
}
atomikos/src/main/java/com/baeldung/atomikos/spring/jpa/inventory/InventoryRepository.java
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package com.baeldung.atomikos.spring.jpa.inventory;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface InventoryRepository extends JpaRepository<Inventory, String> {
}
atomikos/src/main/java/com/baeldung/atomikos/spring/jpa/order/Order.java
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package com.baeldung.atomikos.spring.jpa.order;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.validation.constraints.Max;
@Entity
@Table(name = "ORDERS")
public class Order {
@Id
private String orderId;
private String productId;
@Max(5)
private Long amount;
public String getOrderId() {
return orderId;
}
public void setOrderId(String orderId) {
this.orderId = orderId;
}
public String getProductId() {
return productId;
}
public void setProductId(String productId) {
this.productId = productId;
}
public Long getAmount() {
return amount;
}
public void setAmount(Long amount) {
this.amount = amount;
}
}
atomikos/src/main/java/com/baeldung/atomikos/spring/jpa/order/OrderConfig.java
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package com.baeldung.atomikos.spring.jpa.order;
import java.util.Properties;
import javax.persistence.EntityManagerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import com.atomikos.jdbc.AtomikosDataSourceBean;
@Configuration
@EnableJpaRepositories(basePackages = "com.baeldung.atomikos.spring.jpa.order", entityManagerFactoryRef = "orderEntityManager", transactionManagerRef = "transactionManager")
public class OrderConfig {
@Bean(initMethod = "init", destroyMethod = "close")
public AtomikosDataSourceBean orderDataSource() {
AtomikosDataSourceBean dataSource = new AtomikosDataSourceBean();
dataSource.setLocalTransactionMode(true);
dataSource.setUniqueResourceName("db2");
dataSource.setXaDataSourceClassName("org.apache.derby.jdbc.EmbeddedXADataSource");
Properties xaProperties = new Properties();
xaProperties.put("databaseName", "db2");
xaProperties.put("createDatabase", "create");
dataSource.setXaProperties(xaProperties);
dataSource.setPoolSize(10);
return dataSource;
}
@Bean
public EntityManagerFactory orderEntityManager() {
HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
factory.setJpaVendorAdapter(vendorAdapter);
factory.setPackagesToScan("com.baeldung.atomikos.spring.jpa.order");
factory.setDataSource(orderDataSource());
Properties jpaProperties = new Properties();
//jpaProperties.put("hibernate.show_sql", "true");
//jpaProperties.put("hibernate.format_sql", "true");
jpaProperties.put("hibernate.dialect", "org.hibernate.dialect.DerbyDialect");
jpaProperties.put("hibernate.current_session_context_class", "jta");
jpaProperties.put("javax.persistence.transactionType", "jta");
jpaProperties.put("hibernate.transaction.manager_lookup_class", "com.atomikos.icatch.jta.hibernate3.TransactionManagerLookup");
jpaProperties.put("hibernate.hbm2ddl.auto", "create-drop");
factory.setJpaProperties(jpaProperties);
factory.afterPropertiesSet();
return factory.getObject();
}
}
atomikos/src/main/java/com/baeldung/atomikos/spring/jpa/order/OrderRepository.java
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package com.baeldung.atomikos.spring.jpa.order;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface OrderRepository extends JpaRepository<Order, String> {
}
atomikos/src/main/resources/logback.xml
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>
atomikos/src/main/resources/schema.sql
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CREATE TABLE INVENTORY (
productId VARCHAR PRIMARY KEY,
balance INT
);
CREATE TABLE ORDERS (
orderId VARCHAR PRIMARY KEY,
productId VARCHAR,
amount INT NOT NULL CHECK (amount <= 5)
);
atomikos/src/main/resources/transactions.properties
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com.atomikos.icatch.file=logs
atomikos/src/test/java/com/baeldung/atomikos/direct/ApplicationUnitTest.java
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package com.baeldung.atomikos.direct;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
import java.util.UUID;
import javax.sql.DataSource;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;
import com.atomikos.icatch.jta.UserTransactionImp;
import com.atomikos.jdbc.AtomikosDataSourceBean;
public class ApplicationUnitTest {
private static DataSource inventoryDataSource;
private static DataSource orderDataSource;
private static String productId = UUID.randomUUID()
.toString();
@Test
@Ignore
public void testPlaceOrderSuccess() throws Exception {
int amount = 1;
long initialBalance = getBalance(inventoryDataSource, productId);
Application application = new Application(inventoryDataSource, orderDataSource);
application.placeOrder(productId, amount);
long finalBalance = getBalance(inventoryDataSource, productId);
assertEquals(initialBalance - amount, finalBalance);
}
@Test
@Ignore
public void testPlaceOrderFailure() throws Exception {
int amount = 10;
long initialBalance = getBalance(inventoryDataSource, productId);
Application application = new Application(inventoryDataSource, orderDataSource);
application.placeOrder(productId, amount);
long finalBalance = getBalance(inventoryDataSource, productId);
assertEquals(initialBalance, finalBalance);
}
@BeforeClass
public static void setUp() throws SQLException {
inventoryDataSource = getDataSource("db1");
orderDataSource = getDataSource("db2");
Connection inventoryConnection = inventoryDataSource.getConnection();
Connection orderConnection = orderDataSource.getConnection();
String createInventoryTable = "create table Inventory ( " + " productId VARCHAR ( 100 ) PRIMARY KEY, balance INT )";
String createInventoryRow = "insert into Inventory values ( '" + productId + "', 10000 )";
Statement s1 = inventoryConnection.createStatement();
try {
s1.executeUpdate(createInventoryTable);
} catch (Exception e) {
System.out.println("Inventory table exists");
}
try {
s1.executeUpdate(createInventoryRow);
} catch (Exception e) {
System.out.println("Product row exists");
}
s1.close();
String createOrderTable = "create table Orders ( orderId VARCHAR ( 100 ) PRIMARY KEY, productId VARCHAR ( 100 ), amount INT NOT NULL CHECK (amount <= 5) )";
Statement s2 = orderConnection.createStatement();
try {
s2.executeUpdate(createOrderTable);
} catch (Exception e) {
System.out.println("Orders table exists");
}
s2.close();
inventoryConnection.close();
orderConnection.close();
}
private static DataSource getDataSource(String db) {
DataSource ds;
AtomikosDataSourceBean ads = new AtomikosDataSourceBean();
ads.setXaDataSourceClassName("org.apache.derby.jdbc.EmbeddedXADataSource");
Properties properties = new Properties();
properties.put("databaseName", db);
properties.put("createDatabase", "create");
ads.setXaProperties(properties);
ads.setUniqueResourceName(db);
ads.setPoolSize(10); // optional
ads.setBorrowConnectionTimeout(10); // optional
ds = ads;
return ds;
}
private static long getBalance(DataSource inventoryDataSource, String productId) throws Exception {
UserTransactionImp utx = new UserTransactionImp();
utx.begin();
Connection inventoryConnection = inventoryDataSource.getConnection();
Statement s1 = inventoryConnection.createStatement();
String q1 = "select balance from Inventory where productId='" + productId + "'";
ResultSet rs1 = s1.executeQuery(q1);
if (rs1 == null || !rs1.next())
throw new Exception("Product not found: " + productId);
long balance = rs1.getLong(1);
inventoryConnection.close();
utx.commit();
return balance;
}
}
atomikos/src/test/java/com/baeldung/atomikos/spring/ApplicationUnitTest.java
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package com.baeldung.atomikos.spring;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.UUID;
import javax.sql.DataSource;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.baeldung.atomikos.spring.config.Config;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = { Config.class })
public class ApplicationUnitTest {
private static String productId = UUID.randomUUID()
.toString();
@Autowired
Application application;
@Autowired
DataSource inventoryDataSource;
@Autowired
DataSource orderDataSource;
@Test
@Ignore
public void testPlaceOrderSuccess() throws Exception {
int amount = 1;
long initialBalance = getBalance(inventoryDataSource, productId);
application.placeOrder(productId, amount);
long finalBalance = getBalance(inventoryDataSource, productId);
assertEquals(initialBalance - amount, finalBalance);
}
@Test
@Ignore
public void testPlaceOrderFailure() throws Exception {
int amount = 10;
long initialBalance = getBalance(inventoryDataSource, productId);
try {
application.placeOrder(productId, amount);
} catch (Exception e) {
System.out.println(e.getMessage());
}
long finalBalance = getBalance(inventoryDataSource, productId);
assertEquals(initialBalance, finalBalance);
}
@Before
public void setUp() throws SQLException {
Connection inventoryConnection = inventoryDataSource.getConnection();
Connection orderConnection = orderDataSource.getConnection();
String createInventoryTable = "create table Inventory ( " + " productId VARCHAR ( 100 ) PRIMARY KEY, balance INT )";
String createInventoryRow = "insert into Inventory values ( '" + productId + "', 10000 )";
Statement s1 = inventoryConnection.createStatement();
try {
s1.executeUpdate(createInventoryTable);
} catch (Exception e) {
System.out.println("Inventory table exists");
}
try {
s1.executeUpdate(createInventoryRow);
} catch (Exception e) {
System.out.println("Product row exists");
}
s1.close();
String createOrderTable = "create table Orders ( orderId VARCHAR ( 100 ) PRIMARY KEY, productId VARCHAR ( 100 ), amount INT NOT NULL CHECK (amount <= 5) )";
Statement s2 = orderConnection.createStatement();
try {
s2.executeUpdate(createOrderTable);
} catch (Exception e) {
System.out.println("Orders table exists");
}
s2.close();
inventoryConnection.close();
orderConnection.close();
}
private static long getBalance(DataSource inventoryDataSource, String productId) throws Exception {
Connection inventoryConnection = inventoryDataSource.getConnection();
Statement s1 = inventoryConnection.createStatement();
String q1 = "select balance from Inventory where productId='" + productId + "'";
ResultSet rs1 = s1.executeQuery(q1);
if (rs1 == null || !rs1.next())
throw new Exception("Product not found: " + productId);
long balance = rs1.getLong(1);
inventoryConnection.close();
return balance;
}
}
atomikos/src/test/java/com/baeldung/atomikos/spring/jpa/ApplicationUnitTest.java
+80
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@@ -0,0 +1,80 @@
package com.baeldung.atomikos.spring.jpa;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.sql.SQLException;
import java.util.UUID;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.baeldung.atomikos.spring.jpa.config.Config;
import com.baeldung.atomikos.spring.jpa.inventory.Inventory;
import com.baeldung.atomikos.spring.jpa.inventory.InventoryConfig;
import com.baeldung.atomikos.spring.jpa.inventory.InventoryRepository;
import com.baeldung.atomikos.spring.jpa.order.OrderConfig;
import com.baeldung.atomikos.spring.jpa.order.OrderRepository;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = { Config.class, InventoryConfig.class, OrderConfig.class })
public class ApplicationUnitTest {
private static String productId = UUID.randomUUID()
.toString();
@Autowired
Application application;
@Autowired
InventoryRepository inventoryRepository;
@Autowired
OrderRepository orderRepository;
@Test
@Ignore
public void testPlaceOrderSuccess() throws Exception {
int amount = 1;
long initialBalance = getBalance(inventoryRepository, productId);
application.placeOrder(productId, amount);
long finalBalance = getBalance(inventoryRepository, productId);
assertEquals(initialBalance - amount, finalBalance);
}
@Test
@Ignore
public void testPlaceOrderFailure() throws Exception {
int amount = 10;
long initialBalance = getBalance(inventoryRepository, productId);
try {
application.placeOrder(productId, amount);
} catch (Exception e) {
System.out.println(e.getMessage());
}
long finalBalance = getBalance(inventoryRepository, productId);
assertEquals(initialBalance, finalBalance);
}
@Before
public void setUp() throws SQLException {
Inventory inventory = new Inventory();
inventory.setProductId(productId);
inventory.setBalance(new Long(10000));
inventoryRepository.save(inventory);
}
private static long getBalance(InventoryRepository inventoryRepository, String productId) throws Exception {
return inventoryRepository.findOne(productId)
.getBalance();
}
}
atomikos/src/test/resources/logback.xml
+13
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@@ -0,0 +1,13 @@
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>
atomikos/src/test/resources/transactions.properties
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@@ -0,0 +1 @@
com.atomikos.icatch.file=logs
core-groovy/src/test/groovy/com/baeldung/stringtoint/ConvertStringToInt.groovy
+110
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@@ -0,0 +1,110 @@
package com.baeldung.stringtoint
import org.junit.Test
import java.text.DecimalFormat
import static org.junit.Assert.assertEquals
import static org.junit.Assert.assertNull
class ConvertStringToInt {
@Test
void givenString_whenUsingAsInteger_thenConvertToInteger() {
def stringNum = "123"
def invalidString = "123a"
Integer expectedInteger = 123
Integer integerNum = stringNum as Integer
def intNum = invalidString?.isInteger() ? invalidString as Integer : null
assertNull(null, intNum)
assertEquals(integerNum, expectedInteger)
}
@Test
void givenString_whenUsingAsInt_thenConvertToInt() {
def stringNum = "123"
int expectedInt = 123
int intNum = stringNum as int
assertEquals(intNum, expectedInt)
}
@Test
void givenString_whenUsingToInteger_thenConvertToInteger() {
def stringNum = "123"
int expectedInt = 123
int intNum = stringNum.toInteger()
assertEquals(intNum, expectedInt)
}
@Test
void givenString_whenUsingParseInt_thenConvertToInteger() {
def stringNum = "123"
int expectedInt = 123
int intNum = Integer.parseInt(stringNum)
assertEquals(intNum, expectedInt)
}
@Test
void givenString_whenUsingValueOf_thenConvertToInteger() {
def stringNum = "123"
int expectedInt = 123
int intNum = Integer.valueOf(stringNum)
assertEquals(intNum, expectedInt)
}
@Test
void givenString_whenUsingIntValue_thenConvertToInteger() {
def stringNum = "123"
int expectedInt = 123
int intNum = new Integer(stringNum).intValue()
assertEquals(intNum, expectedInt)
}
@Test
void givenString_whenUsingNewInteger_thenConvertToInteger() {
def stringNum = "123"
int expectedInt = 123
int intNum = new Integer(stringNum)
assertEquals(intNum, expectedInt)
}
@Test
void givenString_whenUsingDecimalFormat_thenConvertToInteger() {
def stringNum = "123"
int expectedInt = 123
DecimalFormat decimalFormat = new DecimalFormat("#")
int intNum = decimalFormat.parse(stringNum).intValue()
assertEquals(intNum, expectedInt)
}
@Test(expected = NumberFormatException.class)
void givenInvalidString_whenUsingAs_thenThrowNumberFormatException() {
def invalidString = "123a"
invalidString as Integer
}
@Test(expected = NullPointerException.class)
void givenNullString_whenUsingToInteger_thenThrowNullPointerException() {
def invalidString = null
invalidString.toInteger()
}
@Test
void givenString_whenUsingIsInteger_thenCheckIfCorrectValue() {
def invalidString = "123a"
def validString = "123"
def invalidNum = invalidString?.isInteger() ? invalidString as Integer : false
def correctNum = validString?.isInteger() ? validString as Integer : false
assertEquals(false, invalidNum)
assertEquals(123, correctNum)
}
}
core-java-modules/core-java-14/README.md
+1
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@@ -7,3 +7,4 @@ This module contains articles about Java 14.
- [Guide to the @Serial Annotation in Java 14](https://www.baeldung.com/java-14-serial-annotation) - [Guide to the @Serial Annotation in Java 14](https://www.baeldung.com/java-14-serial-annotation)
- [Java Text Blocks](https://www.baeldung.com/java-text-blocks) - [Java Text Blocks](https://www.baeldung.com/java-text-blocks)
- [Pattern Matching for instanceof in Java 14](https://www.baeldung.com/java-pattern-matching-instanceof) - [Pattern Matching for instanceof in Java 14](https://www.baeldung.com/java-pattern-matching-instanceof)
- [Helpful NullPointerExceptions in Java 14](https://www.baeldung.com/java-14-nullpointerexception)
core-java-modules/core-java-collections-maps/README.md
-1
View File
@@ -4,7 +4,6 @@ This module contains articles about Map data structures in Java.
### Relevant Articles: ### Relevant Articles:
- [Guide to the Guava BiMap](https://www.baeldung.com/guava-bimap) - [Guide to the Guava BiMap](https://www.baeldung.com/guava-bimap)
- [A Guide to Java HashMap](https://www.baeldung.com/java-hashmap)
- [A Guide to LinkedHashMap in Java](https://www.baeldung.com/java-linked-hashmap) - [A Guide to LinkedHashMap in Java](https://www.baeldung.com/java-linked-hashmap)
- [A Guide to TreeMap in Java](https://www.baeldung.com/java-treemap) - [A Guide to TreeMap in Java](https://www.baeldung.com/java-treemap)
- [How to Store Duplicate Keys in a Map in Java?](https://www.baeldung.com/java-map-duplicate-keys) - [How to Store Duplicate Keys in a Map in Java?](https://www.baeldung.com/java-map-duplicate-keys)
core-java-modules/core-java-concurrency-advanced-3/README.md
+1
View File
@@ -10,4 +10,5 @@ This module contains articles about advanced topics about multithreading with co
- [Guide to RejectedExecutionHandler](https://www.baeldung.com/java-rejectedexecutionhandler) - [Guide to RejectedExecutionHandler](https://www.baeldung.com/java-rejectedexecutionhandler)
- [Guide to Work Stealing in Java](https://www.baeldung.com/java-work-stealing) - [Guide to Work Stealing in Java](https://www.baeldung.com/java-work-stealing)
- [Asynchronous Programming in Java](https://www.baeldung.com/java-asynchronous-programming) - [Asynchronous Programming in Java](https://www.baeldung.com/java-asynchronous-programming)
- [Java Thread Deadlock and Livelock](https://www.baeldung.com/java-deadlock-livelock)
- [[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2) - [[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2)
core-java-modules/core-java-concurrency-basic-2/README.md
+2 -1
View File
@@ -8,4 +8,5 @@ This module contains articles about basic Java concurrency
- [Difference Between Wait and Sleep in Java](https://www.baeldung.com/java-wait-and-sleep) - [Difference Between Wait and Sleep in Java](https://www.baeldung.com/java-wait-and-sleep)
- [Guide to the Synchronized Keyword in Java](https://www.baeldung.com/java-synchronized) - [Guide to the Synchronized Keyword in Java](https://www.baeldung.com/java-synchronized)
- [Life Cycle of a Thread in Java](https://www.baeldung.com/java-thread-lifecycle) - [Life Cycle of a Thread in Java](https://www.baeldung.com/java-thread-lifecycle)
- [[<-- Prev]](/core-java-modules/core-java-concurrency-basic) - [Guide to AtomicMarkableReference](https://www.baeldung.com/java-atomicmarkablereference)
- [[<-- Prev]](/core-java-modules/core-java-concurrency-basic)
core-java-modules/core-java-concurrency-testing/.gitignore
-26
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@@ -1,26 +0,0 @@
*.class
0.*
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
.resourceCache
# Packaged files #
*.jar
*.war
*.ear
# Files generated by integration tests
*.txt
backup-pom.xml
/bin/
/temp
#IntelliJ specific
.idea/
*.iml
core-java-modules/core-java-concurrency-testing/pom.xml
+85 -85
View File
@@ -1,93 +1,93 @@
<?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>core-java-concurrency-testing</artifactId> <artifactId>core-java-concurrency-testing</artifactId>
<version>0.1.0-SNAPSHOT</version> <version>0.1.0-SNAPSHOT</version>
<name>core-java-concurrency-testing</name> <name>core-java-concurrency-testing</name>
<packaging>jar</packaging> <packaging>jar</packaging>
<parent> <parent>
<groupId>com.baeldung</groupId> <groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId> <artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version> <version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-java</relativePath> <relativePath>../../parent-java</relativePath>
</parent> </parent>
<dependencies> <dependencies>
<dependency> <dependency>
<groupId>junit</groupId> <groupId>junit</groupId>
<artifactId>junit</artifactId> <artifactId>junit</artifactId>
<version>4.13</version> <version>4.13</version>
<scope>test</scope> <scope>test</scope>
</dependency> </dependency>
<dependency> <dependency>
<groupId>com.googlecode.thread-weaver</groupId> <groupId>com.googlecode.thread-weaver</groupId>
<artifactId>threadweaver</artifactId> <artifactId>threadweaver</artifactId>
<version>0.2</version> <version>0.2</version>
<scope>test</scope> <scope>test</scope>
</dependency> </dependency>
<dependency> <dependency>
<groupId>com.google.code.tempus-fugit</groupId> <groupId>com.google.code.tempus-fugit</groupId>
<artifactId>tempus-fugit</artifactId> <artifactId>tempus-fugit</artifactId>
<version>1.1</version> <version>1.1</version>
<scope>test</scope> <scope>test</scope>
</dependency> </dependency>
<dependency> <dependency>
<groupId>com.googlecode.multithreadedtc</groupId> <groupId>com.googlecode.multithreadedtc</groupId>
<artifactId>multithreadedtc</artifactId> <artifactId>multithreadedtc</artifactId>
<version>1.01</version> <version>1.01</version>
<scope>test</scope> <scope>test</scope>
</dependency> </dependency>
<dependency> <dependency>
<groupId>org.openjdk.jcstress</groupId> <groupId>org.openjdk.jcstress</groupId>
<artifactId>jcstress-core</artifactId> <artifactId>jcstress-core</artifactId>
<version>0.5</version> <version>0.5</version>
</dependency> </dependency>
</dependencies> </dependencies>
<build> <build>
<plugins> <plugins>
<plugin> <plugin>
<groupId>org.apache.maven.plugins</groupId> <groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId> <artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version> <version>3.1</version>
<configuration> <configuration>
<compilerVersion>${javac.target}</compilerVersion> <compilerVersion>${javac.target}</compilerVersion>
<source>${javac.target}</source> <source>${javac.target}</source>
<target>${javac.target}</target> <target>${javac.target}</target>
</configuration> </configuration>
</plugin> </plugin>
<plugin> <plugin>
<groupId>org.apache.maven.plugins</groupId> <groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId> <artifactId>maven-shade-plugin</artifactId>
<version>2.2</version> <version>2.2</version>
<executions> <executions>
<execution> <execution>
<id>main</id> <id>main</id>
<phase>package</phase> <phase>package</phase>
<goals> <goals>
<goal>shade</goal> <goal>shade</goal>
</goals> </goals>
<configuration> <configuration>
<finalName>jcstress</finalName> <finalName>jcstress</finalName>
<transformers> <transformers>
<transformer <transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer"> implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.openjdk.jcstress.Main</mainClass> <mainClass>org.openjdk.jcstress.Main</mainClass>
</transformer> </transformer>
<transformer <transformer
implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer"> implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
<resource>META-INF/TestList</resource> <resource>META-INF/TestList</resource>
</transformer> </transformer>
</transformers> </transformers>
</configuration> </configuration>
</execution> </execution>
</executions> </executions>
</plugin> </plugin>
</plugins> </plugins>
</build> </build>
</project> </project>
core-java-modules/core-java-date-operations-2/README.md
+1
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@@ -7,4 +7,5 @@ This module contains articles about date operations in Java.
- [Checking If Two Java Dates Are on the Same Day](https://www.baeldung.com/java-check-two-dates-on-same-day) - [Checking If Two Java Dates Are on the Same Day](https://www.baeldung.com/java-check-two-dates-on-same-day)
- [Converting Java Date to OffsetDateTime](https://www.baeldung.com/java-convert-date-to-offsetdatetime) - [Converting Java Date to OffsetDateTime](https://www.baeldung.com/java-convert-date-to-offsetdatetime)
- [How to Set the JVM Time Zone](https://www.baeldung.com/java-jvm-time-zone) - [How to Set the JVM Time Zone](https://www.baeldung.com/java-jvm-time-zone)
- [How to determine day of week by passing specific date in Java?](https://www.baeldung.com/java-get-day-of-week)
- [[<-- Prev]](/core-java-modules/core-java-date-operations-1) - [[<-- Prev]](/core-java-modules/core-java-date-operations-1)

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