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BAEL-2274 DDD Bounded Contexts and Java Modules

This commit is contained in:
Alexander Molochko 2020-02-14 08:29:21 +02:00
parent 7693dea699
commit 0cc2c4f50d
31 changed files with 956 additions and 0 deletions
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ddd-modules/README.md Normal file
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## Relevant Articles

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ddd-modules/infrastructure/pom.xml Normal file
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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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.dddmodules.infrastructure</groupId>
<artifactId>infrastructure</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.dddmodules</groupId>
<artifactId>dddmodules</artifactId>
<version>1.0</version>
</parent>
<dependencies>
<dependency>
<groupId>com.baeldung.dddmodules.shippingcontext</groupId>
<artifactId>shippingcontext</artifactId>
<version>${appmodules.version}</version>
</dependency>
<dependency>
<groupId>com.baeldung.dddmodules.ordercontext</groupId>
<artifactId>ordercontext</artifactId>
<version>${appmodules.version}</version>
</dependency>
<dependency>
<groupId>com.baeldung.dddmodules.sharedkernel</groupId>
<artifactId>sharedkernel</artifactId>
<version>${appmodules.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${source.version}</source>
<target>${target.version}</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<source.version>9</source.version>
<target.version>9</target.version>
</properties>
</project>

79
ddd-modules/infrastructure/src/main/java/com/baeldung/dddmodules/infrastructure/db/InMemoryOrderStore.java Normal file
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package com.baeldung.dddmodules.infrastructure.db;
import com.baeldung.dddmodules.ordercontext.model.CustomerOrder;
import com.baeldung.dddmodules.ordercontext.repository.CustomerOrderRepository;
import com.baeldung.dddmodules.shippingcontext.model.PackageItem;
import com.baeldung.dddmodules.shippingcontext.model.ShippableOrder;
import com.baeldung.dddmodules.shippingcontext.repository.ShippingOrderRepository;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;
public class InMemoryOrderStore implements CustomerOrderRepository, ShippingOrderRepository {
private Map<Integer, PersistenceOrder> ordersDb = new HashMap<>();
private volatile static InMemoryOrderStore instance = new InMemoryOrderStore();
@Override
public void saveCustomerOrder(CustomerOrder order) {
this.ordersDb.put(order.getOrderId(), new PersistenceOrder(order.getOrderId(),
order.getPaymentMethod(),
order.getAddress(),
order
.getOrderItems()
.stream()
.map(orderItem ->
new PersistenceOrder.OrderItem(orderItem.getProductId(),
orderItem.getQuantity(),
orderItem.getUnitWeight(),
orderItem.getUnitPrice()))
.collect(Collectors.toList())
));
}
@Override
public Optional<ShippableOrder> findShippableOrder(int orderId) {
if (!this.ordersDb.containsKey(orderId)) return Optional.empty();
PersistenceOrder orderRecord = this.ordersDb.get(orderId);
return Optional.of(
new ShippableOrder(orderRecord.orderId, orderRecord.orderItems
.stream().map(orderItem -> new PackageItem(orderItem.productId,
orderItem.itemWeight,
orderItem.quantity * orderItem.unitPrice)
).collect(Collectors.toList())));
}
public static InMemoryOrderStore provider() {
return instance;
}
public static class PersistenceOrder {
public int orderId;
public String paymentMethod;
public String address;
public List<OrderItem> orderItems;
public PersistenceOrder(int orderId, String paymentMethod, String address, List<OrderItem> orderItems) {
this.orderId = orderId;
this.paymentMethod = paymentMethod;
this.address = address;
this.orderItems = orderItems;
}
public static class OrderItem {
public int productId;
public float unitPrice;
public float itemWeight;
public int quantity;
public OrderItem(int productId, int quantity, float unitWeight, float unitPrice) {
this.itemWeight = unitWeight;
this.quantity = quantity;
this.unitPrice = unitPrice;
this.productId = productId;
}
}
}
}

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ddd-modules/infrastructure/src/main/java/com/baeldung/dddmodules/infrastructure/events/SimpleEventBus.java Normal file
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package com.baeldung.dddmodules.infrastructure.events;
import com.baeldung.dddmodules.sharedkernel.events.ApplicationEvent;
import com.baeldung.dddmodules.sharedkernel.events.EventBus;
import com.baeldung.dddmodules.sharedkernel.events.EventSubscriber;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet;
public class SimpleEventBus implements EventBus {
private final Map<String, Set<EventSubscriber>> subscribers = new ConcurrentHashMap<>();
@Override
public <E extends ApplicationEvent> void publish(E event) {
if (subscribers.containsKey(event.getType())) {
subscribers.get(event.getType())
.forEach(subscriber -> subscriber.onEvent(event));
}
}
@Override
public <E extends ApplicationEvent> void subscribe(String eventType, EventSubscriber subscriber) {
Set<EventSubscriber> eventSubscribers = subscribers.get(eventType);
if (eventSubscribers == null) {
eventSubscribers = new CopyOnWriteArraySet<>();
subscribers.put(eventType, eventSubscribers);
}
eventSubscribers.add(subscriber);
}
@Override
public <E extends ApplicationEvent> void unsubscribe(String eventType, EventSubscriber subscriber) {
if (subscribers.containsKey(eventType)) {
subscribers.get(eventType).remove(subscriber);
}
}
}

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ddd-modules/infrastructure/src/main/java/module-info.java Normal file
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module com.baeldung.dddmodules.infrastructure {
requires transitive com.baeldung.dddmodules.sharedkernel;
requires transitive com.baeldung.dddmodules.ordercontext;
requires transitive com.baeldung.dddmodules.shippingcontext;
provides com.baeldung.dddmodules.sharedkernel.events.EventBus
with com.baeldung.dddmodules.infrastructure.events.SimpleEventBus;
provides com.baeldung.dddmodules.ordercontext.repository.CustomerOrderRepository
with com.baeldung.dddmodules.infrastructure.db.InMemoryOrderStore;
provides com.baeldung.dddmodules.shippingcontext.repository.ShippingOrderRepository
with com.baeldung.dddmodules.infrastructure.db.InMemoryOrderStore;
}

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ddd-modules/mainapp/pom.xml Normal file
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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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.dddmodules.mainapp</groupId>
<artifactId>mainapp</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.dddmodules</groupId>
<artifactId>dddmodules</artifactId>
<version>1.0</version>
</parent>
<dependencies>
<dependency>
<groupId>com.baeldung.dddmodules.infrastructure</groupId>
<artifactId>infrastructure</artifactId>
<version>${appmodules.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.16</version>
<configuration>
<enableAssertions>true</enableAssertions>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${compiler.plugin.version}</version>
<configuration>
<source>${source.version}</source>
<target>${target.version}</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<source.version>9</source.version>
<target.version>9</target.version>
</properties>
</project>

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ddd-modules/mainapp/src/main/java/com/baeldung/dddmodules/mainapp/Application.java Normal file
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package com.baeldung.dddmodules.mainapp;
import com.baeldung.dddmodules.ordercontext.model.CustomerOrder;
import com.baeldung.dddmodules.ordercontext.model.OrderItem;
import com.baeldung.dddmodules.ordercontext.repository.CustomerOrderRepository;
import com.baeldung.dddmodules.ordercontext.service.OrderService;
import com.baeldung.dddmodules.sharedkernel.events.EventBus;
import com.baeldung.dddmodules.shippingcontext.repository.ShippingOrderRepository;
import com.baeldung.dddmodules.shippingcontext.service.ShippingService;
import java.util.*;
public class Application {
public static void main(String args[]) {
Map<Class<?>, Object> container = createContainer();
OrderService orderService = (OrderService) container.get(OrderService.class);
ShippingService shippingService = (ShippingService) container.get(ShippingService.class);
shippingService.listenToOrderEvents();
CustomerOrder customerOrder = new CustomerOrder();
int orderId = 1;
customerOrder.setOrderId(orderId);
List<OrderItem> orderItems = new ArrayList<OrderItem>();
orderItems.add(new OrderItem(1, 2, 3, 1));
orderItems.add(new OrderItem(2, 1, 1, 1));
orderItems.add(new OrderItem(3, 4, 11, 21));
customerOrder.setOrderItems(orderItems);
customerOrder.setPaymentMethod("PayPal");
customerOrder.setAddress("Full address here");
orderService.placeOrder(customerOrder);
if (orderId == shippingService.getParcelByOrderId(orderId).get().getOrderId()) {
System.out.println("Order has been processed and shipped successfully");
}
}
public static Map<Class<?>, Object> createContainer() {
EventBus eventBus = ServiceLoader.load(EventBus.class).findFirst().get();
CustomerOrderRepository customerOrderRepository = ServiceLoader.load(CustomerOrderRepository.class).findFirst().get();
ShippingOrderRepository shippingOrderRepository = ServiceLoader.load(ShippingOrderRepository.class).findFirst().get();
ShippingService shippingService = ServiceLoader.load(ShippingService.class).findFirst().get();
shippingService.setEventBus(eventBus);
shippingService.setOrderRepository(shippingOrderRepository);
OrderService orderService = ServiceLoader.load(OrderService.class).findFirst().get();
orderService.setEventBus(eventBus);
orderService.setOrderRepository(customerOrderRepository);
HashMap<Class<?>, Object> container = new HashMap<>();
container.put(OrderService.class, orderService);
container.put(ShippingService.class, shippingService);
return container;
}
}

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ddd-modules/mainapp/src/main/java/module-info.java Normal file
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module com.baeldung.dddmodules.mainapp {
uses com.baeldung.dddmodules.sharedkernel.events.EventBus;
uses com.baeldung.dddmodules.ordercontext.service.OrderService;
uses com.baeldung.dddmodules.ordercontext.repository.CustomerOrderRepository;
uses com.baeldung.dddmodules.shippingcontext.repository.ShippingOrderRepository;
uses com.baeldung.dddmodules.shippingcontext.service.ShippingService;
requires transitive com.baeldung.dddmodules.infrastructure;
}

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ddd-modules/ordercontext/pom.xml Normal file
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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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.dddmodules.ordercontext</groupId>
<artifactId>ordercontext</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.dddmodules</groupId>
<artifactId>dddmodules</artifactId>
<version>1.0</version>
</parent>
<dependencies>
<dependency>
<groupId>com.baeldung.dddmodules.sharedkernel</groupId>
<artifactId>sharedkernel</artifactId>
<version>${appmodules.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${source.version}</source>
<target>${target.version}</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<source.version>9</source.version>
<target.version>9</target.version>
<entitymodule.version>1.0</entitymodule.version>
<daomodule.version>1.0</daomodule.version>
</properties>
</project>

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ddd-modules/ordercontext/src/main/java/com/baeldung/dddmodules/ordercontext/model/CustomerOrder.java Normal file
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package com.baeldung.dddmodules.ordercontext.model;
import java.util.List;
public class CustomerOrder {
private int orderId;
private String paymentMethod;
private String address;
private List<OrderItem> orderItems;
public CustomerOrder() {
}
public float calculateTotalPrice() {
return orderItems.stream().map(OrderItem::getTotalPrice)
.reduce(0F, Float::sum);
}
public void setOrderItems(List<OrderItem> orderItems) {
this.orderItems = orderItems;
}
public int getOrderId() {
return orderId;
}
public List<OrderItem> getOrderItems() {
return orderItems;
}
public void setOrderId(int orderId) {
this.orderId = orderId;
}
public String getPaymentMethod() {
return paymentMethod;
}
public void setPaymentMethod(String paymentMethod) {
this.paymentMethod = paymentMethod;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}

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ddd-modules/ordercontext/src/main/java/com/baeldung/dddmodules/ordercontext/model/OrderItem.java Normal file
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package com.baeldung.dddmodules.ordercontext.model;
public class OrderItem {
private int productId;
private int quantity;
private float unitPrice;
private float unitWeight;
public OrderItem(int productId, int quantity, float unitPrice, float unitWeight) {
this.productId = productId;
this.quantity = quantity;
this.unitPrice = unitPrice;
this.unitWeight = unitWeight;
}
public int getProductId() {
return productId;
}
public void setProductId(int productId) {
this.productId = productId;
}
public int getQuantity() {
return quantity;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
public float getTotalPrice() {
return this.quantity * this.unitPrice;
}
public void setUnitPrice(float unitPrice) {
this.unitPrice = unitPrice;
}
public float getUnitWeight() {
return unitWeight;
}
public float getUnitPrice() {
return unitPrice;
}
public void setUnitWeight(float unitWeight) {
this.unitWeight = unitWeight;
}
}

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ddd-modules/ordercontext/src/main/java/com/baeldung/dddmodules/ordercontext/repository/CustomerOrderRepository.java Normal file
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package com.baeldung.dddmodules.ordercontext.repository;
import com.baeldung.dddmodules.ordercontext.model.CustomerOrder;
public interface CustomerOrderRepository {
void saveCustomerOrder(CustomerOrder order);
}

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ddd-modules/ordercontext/src/main/java/com/baeldung/dddmodules/ordercontext/service/CustomerOrderService.java Normal file
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package com.baeldung.dddmodules.ordercontext.service;
import com.baeldung.dddmodules.ordercontext.model.CustomerOrder;
import com.baeldung.dddmodules.ordercontext.repository.CustomerOrderRepository;
import com.baeldung.dddmodules.sharedkernel.events.ApplicationEvent;
import com.baeldung.dddmodules.sharedkernel.events.EventBus;
import java.util.HashMap;
import java.util.Map;
public class CustomerOrderService implements OrderService {
public static final String EVENT_ORDER_READY_FOR_SHIPMENT = "OrderReadyForShipmentEvent";
private CustomerOrderRepository orderRepository;
private EventBus eventBus;
@Override
public void placeOrder(CustomerOrder order) {
this.orderRepository.saveCustomerOrder(order);
Map<String, String> payload = new HashMap<>();
payload.put("order_id", String.valueOf(order.getOrderId()));
ApplicationEvent event = new ApplicationEvent(payload) {
@Override
public String getType() {
return EVENT_ORDER_READY_FOR_SHIPMENT;
}
};
this.eventBus.publish(event);
}
@Override
public EventBus getEventBus() {
return eventBus;
}
public void setOrderRepository(CustomerOrderRepository orderRepository) {
this.orderRepository = orderRepository;
}
@Override
public void setEventBus(EventBus eventBus) {
this.eventBus = eventBus;
}
}

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ddd-modules/ordercontext/src/main/java/com/baeldung/dddmodules/ordercontext/service/OrderService.java Normal file
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package com.baeldung.dddmodules.ordercontext.service;
import com.baeldung.dddmodules.ordercontext.model.CustomerOrder;
import com.baeldung.dddmodules.ordercontext.repository.CustomerOrderRepository;
import com.baeldung.dddmodules.sharedkernel.service.ApplicationService;
public interface OrderService extends ApplicationService {
void placeOrder(CustomerOrder order);
void setOrderRepository(CustomerOrderRepository orderRepository);
}

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ddd-modules/ordercontext/src/main/java/module-info.java Normal file
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module com.baeldung.dddmodules.ordercontext {
requires com.baeldung.dddmodules.sharedkernel;
exports com.baeldung.dddmodules.ordercontext.service;
exports com.baeldung.dddmodules.ordercontext.model;
exports com.baeldung.dddmodules.ordercontext.repository;
provides com.baeldung.dddmodules.ordercontext.service.OrderService
with com.baeldung.dddmodules.ordercontext.service.CustomerOrderService;
}

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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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.dddmodules</groupId>
<artifactId>dddmodules</artifactId>
<version>1.0</version>
<name>ddd-modules</name>
<packaging>pom</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../</relativePath>
</parent>
<modules>
<module>sharedkernel</module>
<module>infrastructure</module>
<module>shippingcontext</module>
<module>ordercontext</module>
<module>mainapp</module>
</modules>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj-core.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${compiler.plugin.version}</version>
<configuration>
<source>${source.version}</source>
<target>${target.version}</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
<properties>
<compiler.plugin.version>3.8.1</compiler.plugin.version>
<source.version>9</source.version>
<target.version>9</target.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<assertj-core.version>3.12.2</assertj-core.version>
<appmodules.version>1.0</appmodules.version>
</properties>
</project>

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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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.dddmodules.sharedkernel</groupId>
<artifactId>sharedkernel</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.dddmodules</groupId>
<artifactId>dddmodules</artifactId>
<version>1.0</version>
</parent>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${source.version}</source>
<target>${target.version}</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<source.version>9</source.version>
<target.version>9</target.version>
</properties>
</project>

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ddd-modules/sharedkernel/src/main/java/com/baeldung/dddmodules/sharedkernel/events/ApplicationEvent.java Normal file
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package com.baeldung.dddmodules.sharedkernel.events;
import java.util.Map;
public abstract class ApplicationEvent {
protected Map<String, String> payload;
public abstract String getType();
public String getPayloadValue(String key) {
if (this.payload.containsKey(key)) {
return this.payload.get(key);
}
return "";
}
public ApplicationEvent(Map<String, String> payload) {
this.payload = payload;
}
}

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ddd-modules/sharedkernel/src/main/java/com/baeldung/dddmodules/sharedkernel/events/EventBus.java Normal file
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package com.baeldung.dddmodules.sharedkernel.events;
public interface EventBus {
<E extends ApplicationEvent> void publish(E event);
<E extends ApplicationEvent> void subscribe(String eventType, EventSubscriber subscriber);
<E extends ApplicationEvent> void unsubscribe(String eventType, EventSubscriber subscriber);
}

5
ddd-modules/sharedkernel/src/main/java/com/baeldung/dddmodules/sharedkernel/events/EventSubscriber.java Normal file
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package com.baeldung.dddmodules.sharedkernel.events;
public interface EventSubscriber {
<E extends ApplicationEvent> void onEvent(E event);
}

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ddd-modules/sharedkernel/src/main/java/com/baeldung/dddmodules/sharedkernel/service/ApplicationService.java Normal file
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package com.baeldung.dddmodules.sharedkernel.service;
import com.baeldung.dddmodules.sharedkernel.events.ApplicationEvent;
import com.baeldung.dddmodules.sharedkernel.events.EventBus;
import com.baeldung.dddmodules.sharedkernel.events.EventSubscriber;
public interface ApplicationService {
default <E extends ApplicationEvent> void publishEvent(E event) {
EventBus eventBus = getEventBus();
if (eventBus != null) {
eventBus.publish(event);
}
}
default <E extends ApplicationEvent> void subscribe(String eventType, EventSubscriber subscriber) {
EventBus eventBus = getEventBus();
if (eventBus != null) {
eventBus.subscribe(eventType, subscriber);
}
}
default <E extends ApplicationEvent> void unsubscribe(String eventType, EventSubscriber subscriber) {
EventBus eventBus = getEventBus();
if (eventBus != null) {
eventBus.unsubscribe(eventType, subscriber);
}
}
EventBus getEventBus();
void setEventBus(EventBus eventBus);
}

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ddd-modules/sharedkernel/src/main/java/module-info.java Normal file
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module com.baeldung.dddmodules.sharedkernel {
exports com.baeldung.dddmodules.sharedkernel.events;
exports com.baeldung.dddmodules.sharedkernel.service;
}

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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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung.dddmodules.shippingcontext</groupId>
<artifactId>shippingcontext</artifactId>
<version>1.0</version>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.dddmodules</groupId>
<artifactId>dddmodules</artifactId>
<version>1.0</version>
</parent>
<dependencies>
<dependency>
<groupId>com.baeldung.dddmodules.sharedkernel</groupId>
<artifactId>sharedkernel</artifactId>
<version>${appmodules.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${source.version}</source>
<target>${target.version}</target>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<source.version>9</source.version>
<target.version>9</target.version>
</properties>
</project>

37
ddd-modules/shippingcontext/src/main/java/com/baeldung/dddmodules/shippingcontext/model/PackageItem.java Normal file
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@ -0,0 +1,37 @@
package com.baeldung.dddmodules.shippingcontext.model;
public class PackageItem {
private int productId;
private float weight;
private float estimatedValue;
public PackageItem(int productId, float weight, float estimatedValue) {
this.productId = productId;
this.weight = weight;
this.estimatedValue = estimatedValue;
}
public int getProductId() {
return productId;
}
public void setProductId(int productId) {
this.productId = productId;
}
public float getWeight() {
return weight;
}
public void setWeight(float weight) {
this.weight = weight;
}
public float getEstimatedValue() {
return estimatedValue;
}
public void setEstimatedValue(float estimatedValue) {
this.estimatedValue = estimatedValue;
}
}

54
ddd-modules/shippingcontext/src/main/java/com/baeldung/dddmodules/shippingcontext/model/Parcel.java Normal file
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@ -0,0 +1,54 @@
package com.baeldung.dddmodules.shippingcontext.model;
import java.util.List;
public class Parcel {
private int orderId;
private String address;
private String trackingId;
private List<PackageItem> packageItems;
public Parcel(int orderId, String address, List<PackageItem> packageItems) {
this.orderId = orderId;
this.address = address;
this.packageItems = packageItems;
}
public float calculateTotalWeight() {
return packageItems.stream().map(PackageItem::getWeight)
.reduce(0F, Float::sum);
}
public boolean isTaxable() {
return calculateEstimatedValue() > 100;
}
public float calculateEstimatedValue() {
return packageItems.stream().map(PackageItem::getWeight)
.reduce(0F, Float::sum);
}
public int getOrderId() {
return orderId;
}
public void setOrderId(int orderId) {
this.orderId = orderId;
}
public String getTrackingId() {
return trackingId;
}
public void setTrackingId(String trackingId) {
this.trackingId = trackingId;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}

38
ddd-modules/shippingcontext/src/main/java/com/baeldung/dddmodules/shippingcontext/model/ShippableOrder.java Normal file
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@ -0,0 +1,38 @@
package com.baeldung.dddmodules.shippingcontext.model;
import java.util.List;
public class ShippableOrder {
private int orderId;
private String address;
private List<PackageItem> packageItems;
public ShippableOrder(int orderId, List<PackageItem> packageItems) {
this.orderId = orderId;
this.packageItems = packageItems;
}
public int getOrderId() {
return orderId;
}
public void setOrderId(int orderId) {
this.orderId = orderId;
}
public List<PackageItem> getPackageItems() {
return packageItems;
}
public void setPackageItems(List<PackageItem> packageItems) {
this.packageItems = packageItems;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}

9
ddd-modules/shippingcontext/src/main/java/com/baeldung/dddmodules/shippingcontext/repository/ShippingOrderRepository.java Normal file
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@ -0,0 +1,9 @@
package com.baeldung.dddmodules.shippingcontext.repository;
import com.baeldung.dddmodules.shippingcontext.model.ShippableOrder;
import java.util.Optional;
public interface ShippingOrderRepository {
Optional<ShippableOrder> findShippableOrder(int orderId);
}

63
ddd-modules/shippingcontext/src/main/java/com/baeldung/dddmodules/shippingcontext/service/ParcelShippingService.java Normal file
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@ -0,0 +1,63 @@
package com.baeldung.dddmodules.shippingcontext.service;
import com.baeldung.dddmodules.sharedkernel.events.ApplicationEvent;
import com.baeldung.dddmodules.sharedkernel.events.EventBus;
import com.baeldung.dddmodules.sharedkernel.events.EventSubscriber;
import com.baeldung.dddmodules.shippingcontext.model.Parcel;
import com.baeldung.dddmodules.shippingcontext.model.ShippableOrder;
import com.baeldung.dddmodules.shippingcontext.repository.ShippingOrderRepository;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
public class ParcelShippingService implements ShippingService {
public static final String EVENT_ORDER_READY_FOR_SHIPMENT = "OrderReadyForShipmentEvent";
private ShippingOrderRepository orderRepository;
private EventBus eventBus;
private Map<Integer, Parcel> shippedParcels = new HashMap<>();
@Override
public void shipOrder(int orderId) {
Optional<ShippableOrder> order = this.orderRepository.findShippableOrder(orderId);
order.ifPresent(completedOrder -> {
Parcel parcel = new Parcel(completedOrder.getOrderId(), completedOrder.getAddress(), completedOrder.getPackageItems());
if (parcel.isTaxable()) {
// Calculate additional taxes
}
// Ship parcel
this.shippedParcels.put(completedOrder.getOrderId(), parcel);
});
}
@Override
public void listenToOrderEvents() {
this.eventBus.subscribe(EVENT_ORDER_READY_FOR_SHIPMENT, new EventSubscriber() {
@Override
public <E extends ApplicationEvent> void onEvent(E event) {
shipOrder(Integer.parseInt(event.getPayloadValue("order_id")));
}
});
}
@Override
public Optional<Parcel> getParcelByOrderId(int orderId) {
return Optional.ofNullable(this.shippedParcels.get(orderId));
}
public void setOrderRepository(ShippingOrderRepository orderRepository) {
this.orderRepository = orderRepository;
}
@Override
public EventBus getEventBus() {
return eventBus;
}
@Override
public void setEventBus(EventBus eventBus) {
this.eventBus = eventBus;
}
}

17
ddd-modules/shippingcontext/src/main/java/com/baeldung/dddmodules/shippingcontext/service/ShippingService.java Normal file
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@ -0,0 +1,17 @@
package com.baeldung.dddmodules.shippingcontext.service;
import com.baeldung.dddmodules.sharedkernel.service.ApplicationService;
import com.baeldung.dddmodules.shippingcontext.model.Parcel;
import com.baeldung.dddmodules.shippingcontext.repository.ShippingOrderRepository;
import java.util.Optional;
public interface ShippingService extends ApplicationService {
void shipOrder(int orderId);
void listenToOrderEvents();
Optional<Parcel> getParcelByOrderId(int orderId);
void setOrderRepository(ShippingOrderRepository orderRepository);
}

8
ddd-modules/shippingcontext/src/main/java/module-info.java Normal file
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@ -0,0 +1,8 @@
module com.baeldung.dddmodules.shippingcontext {
requires com.baeldung.dddmodules.sharedkernel;
exports com.baeldung.dddmodules.shippingcontext.service;
exports com.baeldung.dddmodules.shippingcontext.model;
exports com.baeldung.dddmodules.shippingcontext.repository;
provides com.baeldung.dddmodules.shippingcontext.service.ShippingService
with com.baeldung.dddmodules.shippingcontext.service.ParcelShippingService;
}

2
pom.xml
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@ -408,6 +408,7 @@
<module>dagger</module>
<module>data-structures</module>
<module>ddd</module>
<!-- <module>ddd-modules</module>--> <!-- we haven't upgraded to Java 9 -->
<module>deeplearning4j</module>
<module>disruptor</module>
<module>dozer</module>
@ -919,6 +920,7 @@
<module>dagger</module>
<module>data-structures</module>
<module>ddd</module>
<!-- <module>ddd-modules</module>--> <!-- we haven't upgraded to Java 9 -->
<module>deeplearning4j</module>
<module>disruptor</module>
<module>dozer</module>