Example for hexagonal architecture in java
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Radhe Sravan
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target/
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.mvn/
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mvnw
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mvnw.cmd
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**
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!**/src/test/**
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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### VS Code ###
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.vscode/
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# HEXAGONAL ARCHITECTURE - EXAMPLE IN JAVA
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A Spring Boot base web application for address book has been built as part of this project based on the hexagonal architecture guidelines, which allows the user to add a contact ad list all the contacts that are available.
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### Running the application
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The application can be run using maven spring-boot run command
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```
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mvn spring-boot:run
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```
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New contact can be added through a POST request on http://loalhost:8080/contacts with the body as
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```
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{
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"name": "ABC",
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"address": "Address",
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"contactNumber": 1234567890
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}
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```
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Existing contacts can be listed using a GET request on the same url http://loalhost:8080/contacts
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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" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.2.0.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.baeldung.hexagonal.arch</groupId>
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<artifactId>hexagonal-architecture</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>hexagonal-architecture</name>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-jpa</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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<exclusions>
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<exclusion>
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<groupId>org.junit.vintage</groupId>
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<artifactId>junit-vintage-engine</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>
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package com.baeldung.hexagonal.arch;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
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@SpringBootApplication
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@EnableAutoConfiguration(exclude = { DataSourceAutoConfiguration.class })
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public class AddressBookApplication {
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public static void main(String[] args) {
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SpringApplication.run(AddressBookApplication.class, args);
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}
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}
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package com.baeldung.hexagonal.arch.adapter.controller;
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import java.util.List;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.PostMapping;
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import org.springframework.web.bind.annotation.RequestBody;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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import com.baeldung.hexagonal.arch.core.domain.Contact;
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import com.baeldung.hexagonal.arch.port.service.AddressBookService;
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@RestController
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@RequestMapping("/contacts")
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public class AddressBookController {
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@Autowired
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private AddressBookService addressBookService;
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@PostMapping
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public void addContact(@RequestBody Contact contact) {
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addressBookService.createContact(contact);
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}
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@GetMapping
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public List<Contact> getAllContacts() {
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return addressBookService.getAllContacts();
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}
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}
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package com.baeldung.hexagonal.arch.adapter.repository;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.stream.Collectors;
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import org.springframework.stereotype.Repository;
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import com.baeldung.hexagonal.arch.core.domain.Contact;
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import com.baeldung.hexagonal.arch.port.repo.ContactRepository;
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@Repository
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public class ContactRepositoryImpl implements ContactRepository {
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private Map<String, Contact> contactsRepo = new HashMap<String, Contact>();
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@Override
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public void createContact(Contact contact) {
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contactsRepo.put(contact.getName(), contact);
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}
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@Override
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public List<Contact> getAllContacts() {
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return contactsRepo.values()
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.stream()
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.collect(Collectors.toList());
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}
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}
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package com.baeldung.hexagonal.arch.core.domain;
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public class Contact {
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private String name;
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private String address;
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private int contactNumber;
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getAddress() {
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return address;
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}
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public void setAddress(String address) {
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this.address = address;
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}
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public int getContactNumber() {
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return contactNumber;
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}
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public void setContactNumber(int contactNumber) {
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this.contactNumber = contactNumber;
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}
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}
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package com.baeldung.hexagonal.arch.core.service;
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import java.util.List;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Service;
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import com.baeldung.hexagonal.arch.core.domain.Contact;
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import com.baeldung.hexagonal.arch.port.repo.ContactRepository;
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import com.baeldung.hexagonal.arch.port.service.AddressBookService;
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@Service
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public class AddressBookServiceImpl implements AddressBookService {
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@Autowired
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ContactRepository contactRepository;
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@Override
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public void createContact(Contact contact) {
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contactRepository.createContact(contact);
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}
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@Override
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public List<Contact> getAllContacts() {
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return contactRepository.getAllContacts();
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}
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}
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package com.baeldung.hexagonal.arch.port.repo;
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import java.util.List;
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import com.baeldung.hexagonal.arch.core.domain.Contact;
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public interface ContactRepository {
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void createContact(Contact contact);
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List<Contact> getAllContacts();
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}
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package com.baeldung.hexagonal.arch.port.service;
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import java.util.List;
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import com.baeldung.hexagonal.arch.core.domain.Contact;
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public interface AddressBookService {
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public void createContact(Contact contact);
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public List<Contact> getAllContacts();
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}
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