mirror of
https://github.com/tiennm99/java-design-patterns.git
synced 2026-06-02 04:12:59 +00:00
refactor: rename and delete some patterns (#2970)
This commit is contained in:
Ilkka Seppälä
@@ -0,0 +1,89 @@
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/*
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||||
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
|
||||
*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2022 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
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package com.iluwatar.cqrs.app;
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import com.iluwatar.cqrs.commandes.CommandServiceImpl;
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import com.iluwatar.cqrs.constants.AppConstants;
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import com.iluwatar.cqrs.queries.QueryServiceImpl;
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import com.iluwatar.cqrs.util.HibernateUtil;
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import lombok.extern.slf4j.Slf4j;
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/**
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* CQRS : Command Query Responsibility Segregation. A pattern used to separate query services from
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* commands or writes services. The pattern is very simple, but it has many consequences. For
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* example, it can be used to tackle down a complex domain, or to use other architectures that were
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* hard to implement with the classical way.
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*
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* <p>This implementation is an example of managing books and authors in a library. The persistence
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* of books and authors is done according to the CQRS architecture. A command side that deals with a
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* data model to persist(insert,update,delete) objects to a database. And a query side that uses
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* native queries to get data from the database and return objects as DTOs (Data transfer Objects).
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*/
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@Slf4j
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public class App {
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/**
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* Program entry point.
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*
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* @param args command line args
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*/
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public static void main(String[] args) {
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var commands = new CommandServiceImpl();
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// Create Authors and Books using CommandService
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commands.authorCreated(AppConstants.E_EVANS, "Eric Evans", "evans@email.com");
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commands.authorCreated(AppConstants.J_BLOCH, "Joshua Bloch", "jBloch@email.com");
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commands.authorCreated(AppConstants.M_FOWLER, "Martin Fowler", "mFowler@email.com");
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commands.bookAddedToAuthor("Domain-Driven Design", 60.08, AppConstants.E_EVANS);
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commands.bookAddedToAuthor("Effective Java", 40.54, AppConstants.J_BLOCH);
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commands.bookAddedToAuthor("Java Puzzlers", 39.99, AppConstants.J_BLOCH);
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commands.bookAddedToAuthor("Java Concurrency in Practice", 29.40, AppConstants.J_BLOCH);
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commands.bookAddedToAuthor("Patterns of Enterprise"
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+ " Application Architecture", 54.01, AppConstants.M_FOWLER);
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commands.bookAddedToAuthor("Domain Specific Languages", 48.89, AppConstants.M_FOWLER);
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commands.authorNameUpdated(AppConstants.E_EVANS, "Eric J. Evans");
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var queries = new QueryServiceImpl();
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// Query the database using QueryService
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var nullAuthor = queries.getAuthorByUsername("username");
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var evans = queries.getAuthorByUsername(AppConstants.E_EVANS);
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var blochBooksCount = queries.getAuthorBooksCount(AppConstants.J_BLOCH);
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var authorsCount = queries.getAuthorsCount();
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var dddBook = queries.getBook("Domain-Driven Design");
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var blochBooks = queries.getAuthorBooks(AppConstants.J_BLOCH);
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LOGGER.info("Author username : {}", nullAuthor);
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LOGGER.info("Author evans : {}", evans);
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LOGGER.info("jBloch number of books : {}", blochBooksCount);
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LOGGER.info("Number of authors : {}", authorsCount);
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LOGGER.info("DDD book : {}", dddBook);
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LOGGER.info("jBloch books : {}", blochBooks);
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HibernateUtil.getSessionFactory().close();
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}
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}
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+46
@@ -0,0 +1,46 @@
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/*
|
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* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
|
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*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2022 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
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*/
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package com.iluwatar.cqrs.commandes;
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/**
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* This interface represents the commands of the CQRS pattern.
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*/
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public interface CommandService {
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void authorCreated(String username, String name, String email);
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void bookAddedToAuthor(String title, double price, String username);
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void authorNameUpdated(String username, String name);
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void authorUsernameUpdated(String oldUsername, String newUsername);
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void authorEmailUpdated(String username, String email);
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void bookTitleUpdated(String oldTitle, String newTitle);
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void bookPriceUpdated(String title, double price);
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}
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+144
@@ -0,0 +1,144 @@
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/*
|
||||
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
|
||||
*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2022 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
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package com.iluwatar.cqrs.commandes;
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import com.iluwatar.cqrs.domain.model.Author;
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import com.iluwatar.cqrs.domain.model.Book;
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import com.iluwatar.cqrs.util.HibernateUtil;
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import org.hibernate.SessionFactory;
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/**
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* This class is an implementation of {@link CommandService} interface. It uses Hibernate as an api
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* for persistence.
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*/
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public class CommandServiceImpl implements CommandService {
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private final SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
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private Author getAuthorByUsername(String username) {
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Author author;
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try (var session = sessionFactory.openSession()) {
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var query = session.createQuery("from Author where username=:username");
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query.setParameter("username", username);
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author = (Author) query.uniqueResult();
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}
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if (author == null) {
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HibernateUtil.getSessionFactory().close();
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throw new NullPointerException("Author " + username + " doesn't exist!");
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}
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return author;
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}
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private Book getBookByTitle(String title) {
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Book book;
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try (var session = sessionFactory.openSession()) {
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var query = session.createQuery("from Book where title=:title");
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query.setParameter("title", title);
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book = (Book) query.uniqueResult();
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}
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if (book == null) {
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HibernateUtil.getSessionFactory().close();
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throw new NullPointerException("Book " + title + " doesn't exist!");
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}
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return book;
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}
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@Override
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public void authorCreated(String username, String name, String email) {
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var author = new Author(username, name, email);
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try (var session = sessionFactory.openSession()) {
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session.beginTransaction();
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session.save(author);
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session.getTransaction().commit();
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}
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}
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@Override
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public void bookAddedToAuthor(String title, double price, String username) {
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var author = getAuthorByUsername(username);
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var book = new Book(title, price, author);
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try (var session = sessionFactory.openSession()) {
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session.beginTransaction();
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session.save(book);
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session.getTransaction().commit();
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}
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}
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@Override
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public void authorNameUpdated(String username, String name) {
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var author = getAuthorByUsername(username);
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author.setName(name);
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try (var session = sessionFactory.openSession()) {
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session.beginTransaction();
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session.update(author);
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session.getTransaction().commit();
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}
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}
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@Override
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public void authorUsernameUpdated(String oldUsername, String newUsername) {
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var author = getAuthorByUsername(oldUsername);
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author.setUsername(newUsername);
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try (var session = sessionFactory.openSession()) {
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session.beginTransaction();
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session.update(author);
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session.getTransaction().commit();
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}
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}
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@Override
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public void authorEmailUpdated(String username, String email) {
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var author = getAuthorByUsername(username);
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author.setEmail(email);
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try (var session = sessionFactory.openSession()) {
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session.beginTransaction();
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session.update(author);
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session.getTransaction().commit();
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}
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}
|
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|
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@Override
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public void bookTitleUpdated(String oldTitle, String newTitle) {
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var book = getBookByTitle(oldTitle);
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book.setTitle(newTitle);
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try (var session = sessionFactory.openSession()) {
|
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session.beginTransaction();
|
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session.update(book);
|
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session.getTransaction().commit();
|
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}
|
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}
|
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|
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@Override
|
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public void bookPriceUpdated(String title, double price) {
|
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var book = getBookByTitle(title);
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book.setPrice(price);
|
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try (var session = sessionFactory.openSession()) {
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session.beginTransaction();
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session.update(book);
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session.getTransaction().commit();
|
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}
|
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}
|
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|
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}
|
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+37
@@ -0,0 +1,37 @@
|
||||
/*
|
||||
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
|
||||
*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2022 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
package com.iluwatar.cqrs.constants;
|
||||
|
||||
/**
|
||||
* Class to define the constants.
|
||||
*/
|
||||
public class AppConstants {
|
||||
|
||||
public static final String E_EVANS = "eEvans";
|
||||
public static final String J_BLOCH = "jBloch";
|
||||
public static final String M_FOWLER = "mFowler";
|
||||
public static final String USER_NAME = "username";
|
||||
|
||||
}
|
||||
+66
@@ -0,0 +1,66 @@
|
||||
/*
|
||||
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
|
||||
*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2022 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
package com.iluwatar.cqrs.domain.model;
|
||||
|
||||
import javax.persistence.Entity;
|
||||
import javax.persistence.GeneratedValue;
|
||||
import javax.persistence.GenerationType;
|
||||
import javax.persistence.Id;
|
||||
import lombok.Getter;
|
||||
import lombok.Setter;
|
||||
import lombok.ToString;
|
||||
|
||||
/**
|
||||
* This is an Author entity. It is used by Hibernate for persistence.
|
||||
*/
|
||||
@ToString
|
||||
@Getter
|
||||
@Setter
|
||||
@Entity
|
||||
public class Author {
|
||||
@Id
|
||||
@GeneratedValue(strategy = GenerationType.IDENTITY)
|
||||
private long id;
|
||||
private String username;
|
||||
private String name;
|
||||
private String email;
|
||||
|
||||
/**
|
||||
* Constructor.
|
||||
*
|
||||
* @param username username of the author
|
||||
* @param name name of the author
|
||||
* @param email email of the author
|
||||
*/
|
||||
public Author(String username, String name, String email) {
|
||||
this.username = username;
|
||||
this.name = name;
|
||||
this.email = email;
|
||||
}
|
||||
|
||||
protected Author() {
|
||||
}
|
||||
|
||||
}
|
||||
+69
@@ -0,0 +1,69 @@
|
||||
/*
|
||||
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
|
||||
*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2022 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
package com.iluwatar.cqrs.domain.model;
|
||||
|
||||
import javax.persistence.Entity;
|
||||
import javax.persistence.GeneratedValue;
|
||||
import javax.persistence.GenerationType;
|
||||
import javax.persistence.Id;
|
||||
import javax.persistence.ManyToOne;
|
||||
import lombok.Getter;
|
||||
import lombok.Setter;
|
||||
import lombok.ToString;
|
||||
|
||||
/**
|
||||
* This is a Book entity. It is used by Hibernate for persistence. Many books can be written by one
|
||||
* {@link Author}
|
||||
*/
|
||||
@ToString
|
||||
@Setter
|
||||
@Getter
|
||||
@Entity
|
||||
public class Book {
|
||||
@Id
|
||||
@GeneratedValue(strategy = GenerationType.IDENTITY)
|
||||
private long id;
|
||||
private String title;
|
||||
private double price;
|
||||
@ManyToOne
|
||||
private Author author;
|
||||
|
||||
/**
|
||||
* Constructor.
|
||||
*
|
||||
* @param title title of the book
|
||||
* @param price price of the book
|
||||
* @param author author of the book
|
||||
*/
|
||||
public Book(String title, double price, Author author) {
|
||||
this.title = title;
|
||||
this.price = price;
|
||||
this.author = author;
|
||||
}
|
||||
|
||||
protected Book() {
|
||||
}
|
||||
|
||||
}
|
||||
+47
@@ -0,0 +1,47 @@
|
||||
/*
|
||||
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
|
||||
*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2022 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
package com.iluwatar.cqrs.dto;
|
||||
|
||||
import lombok.AllArgsConstructor;
|
||||
import lombok.EqualsAndHashCode;
|
||||
import lombok.Getter;
|
||||
import lombok.NoArgsConstructor;
|
||||
import lombok.ToString;
|
||||
|
||||
/**
|
||||
* This is a DTO (Data Transfer Object) author, contains only useful information to be returned.
|
||||
*/
|
||||
@ToString
|
||||
@EqualsAndHashCode
|
||||
@Getter
|
||||
@NoArgsConstructor
|
||||
@AllArgsConstructor
|
||||
public class Author {
|
||||
|
||||
private String name;
|
||||
private String email;
|
||||
private String username;
|
||||
|
||||
}
|
||||
+46
@@ -0,0 +1,46 @@
|
||||
/*
|
||||
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
|
||||
*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2022 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
package com.iluwatar.cqrs.dto;
|
||||
|
||||
import lombok.AllArgsConstructor;
|
||||
import lombok.EqualsAndHashCode;
|
||||
import lombok.Getter;
|
||||
import lombok.NoArgsConstructor;
|
||||
import lombok.ToString;
|
||||
|
||||
/**
|
||||
* This is a DTO (Data Transfer Object) book, contains only useful information to be returned.
|
||||
*/
|
||||
@ToString
|
||||
@EqualsAndHashCode
|
||||
@Getter
|
||||
@AllArgsConstructor
|
||||
@NoArgsConstructor
|
||||
public class Book {
|
||||
|
||||
private String title;
|
||||
private double price;
|
||||
|
||||
}
|
||||
+47
@@ -0,0 +1,47 @@
|
||||
/*
|
||||
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
|
||||
*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2022 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
package com.iluwatar.cqrs.queries;
|
||||
|
||||
import com.iluwatar.cqrs.dto.Author;
|
||||
import com.iluwatar.cqrs.dto.Book;
|
||||
import java.math.BigInteger;
|
||||
import java.util.List;
|
||||
|
||||
/**
|
||||
* This interface represents the query methods of the CQRS pattern.
|
||||
*/
|
||||
public interface QueryService {
|
||||
|
||||
Author getAuthorByUsername(String username);
|
||||
|
||||
Book getBook(String title);
|
||||
|
||||
List<Book> getAuthorBooks(String username);
|
||||
|
||||
BigInteger getAuthorBooksCount(String username);
|
||||
|
||||
BigInteger getAuthorsCount();
|
||||
|
||||
}
|
||||
+107
@@ -0,0 +1,107 @@
|
||||
/*
|
||||
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
|
||||
*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2022 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
package com.iluwatar.cqrs.queries;
|
||||
|
||||
import com.iluwatar.cqrs.constants.AppConstants;
|
||||
import com.iluwatar.cqrs.dto.Author;
|
||||
import com.iluwatar.cqrs.dto.Book;
|
||||
import com.iluwatar.cqrs.util.HibernateUtil;
|
||||
import java.math.BigInteger;
|
||||
import java.util.List;
|
||||
import org.hibernate.SessionFactory;
|
||||
import org.hibernate.query.Query;
|
||||
|
||||
/**
|
||||
* This class is an implementation of {@link QueryService}. It uses Hibernate native queries to
|
||||
* return DTOs from the database.
|
||||
*/
|
||||
public class QueryServiceImpl implements QueryService {
|
||||
|
||||
private final SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
|
||||
|
||||
@Override
|
||||
public Author getAuthorByUsername(String username) {
|
||||
Author authorDto;
|
||||
try (var session = sessionFactory.openSession()) {
|
||||
Query<Author> sqlQuery = session.createQuery(
|
||||
"select new com.iluwatar.cqrs.dto.Author(a.name, a.email, a.username)"
|
||||
+ " from com.iluwatar.cqrs.domain.model.Author a where a.username=:username");
|
||||
sqlQuery.setParameter(AppConstants.USER_NAME, username);
|
||||
authorDto = sqlQuery.uniqueResult();
|
||||
}
|
||||
return authorDto;
|
||||
}
|
||||
|
||||
@Override
|
||||
public Book getBook(String title) {
|
||||
Book bookDto;
|
||||
try (var session = sessionFactory.openSession()) {
|
||||
Query<Book> sqlQuery = session.createQuery(
|
||||
"select new com.iluwatar.cqrs.dto.Book(b.title, b.price)"
|
||||
+ " from com.iluwatar.cqrs.domain.model.Book b where b.title=:title");
|
||||
sqlQuery.setParameter("title", title);
|
||||
bookDto = sqlQuery.uniqueResult();
|
||||
}
|
||||
return bookDto;
|
||||
}
|
||||
|
||||
@Override
|
||||
public List<Book> getAuthorBooks(String username) {
|
||||
List<Book> bookDtos;
|
||||
try (var session = sessionFactory.openSession()) {
|
||||
Query<Book> sqlQuery = session.createQuery(
|
||||
"select new com.iluwatar.cqrs.dto.Book(b.title, b.price)"
|
||||
+ " from com.iluwatar.cqrs.domain.model.Author a, com.iluwatar.cqrs.domain.model.Book b "
|
||||
+ "where b.author.id = a.id and a.username=:username");
|
||||
sqlQuery.setParameter(AppConstants.USER_NAME, username);
|
||||
bookDtos = sqlQuery.list();
|
||||
}
|
||||
return bookDtos;
|
||||
}
|
||||
|
||||
@Override
|
||||
public BigInteger getAuthorBooksCount(String username) {
|
||||
BigInteger bookcount;
|
||||
try (var session = sessionFactory.openSession()) {
|
||||
var sqlQuery = session.createNativeQuery(
|
||||
"SELECT count(b.title)" + " FROM Book b, Author a"
|
||||
+ " where b.author_id = a.id and a.username=:username");
|
||||
sqlQuery.setParameter(AppConstants.USER_NAME, username);
|
||||
bookcount = (BigInteger) sqlQuery.uniqueResult();
|
||||
}
|
||||
return bookcount;
|
||||
}
|
||||
|
||||
@Override
|
||||
public BigInteger getAuthorsCount() {
|
||||
BigInteger authorcount;
|
||||
try (var session = sessionFactory.openSession()) {
|
||||
var sqlQuery = session.createNativeQuery("SELECT count(id) from Author");
|
||||
authorcount = (BigInteger) sqlQuery.uniqueResult();
|
||||
}
|
||||
return authorcount;
|
||||
}
|
||||
|
||||
}
|
||||
+58
@@ -0,0 +1,58 @@
|
||||
/*
|
||||
* This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
|
||||
*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2022 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
package com.iluwatar.cqrs.util;
|
||||
|
||||
import lombok.extern.slf4j.Slf4j;
|
||||
import org.hibernate.SessionFactory;
|
||||
import org.hibernate.boot.MetadataSources;
|
||||
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
|
||||
|
||||
/**
|
||||
* This class simply returns one instance of {@link SessionFactory} initialized when the application
|
||||
* is started.
|
||||
*/
|
||||
@Slf4j
|
||||
public class HibernateUtil {
|
||||
|
||||
private static final SessionFactory SESSIONFACTORY = buildSessionFactory();
|
||||
|
||||
private static SessionFactory buildSessionFactory() {
|
||||
|
||||
// configures settings from hibernate.cfg.xml
|
||||
final var registry = new StandardServiceRegistryBuilder().configure().build();
|
||||
try {
|
||||
return new MetadataSources(registry).buildMetadata().buildSessionFactory();
|
||||
} catch (Exception ex) {
|
||||
StandardServiceRegistryBuilder.destroy(registry);
|
||||
LOGGER.error("Initial SessionFactory creation failed.", ex);
|
||||
throw new ExceptionInInitializerError(ex);
|
||||
}
|
||||
}
|
||||
|
||||
public static SessionFactory getSessionFactory() {
|
||||
return SESSIONFACTORY;
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user