applicationa layer for borrowing books

cancel reservation scheduler added

pom.xml

@@ -6,7 +6,7 @@
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
 		<version>2.2.6.RELEASE</version>
-		<relativePath/> <!-- lookup parent from repository -->
+		<relativePath/>
 	</parent>
 
 	<groupId>io.wkrzywiec.hexagonal</groupId>
@@ -17,14 +17,14 @@
 
 	<properties>
 		<java.version>11</java.version>
-		<spring-cloud.version>Hoxton.M3</spring-cloud.version>
 		<surefire.and.failsafe.report.dir>target/test-report</surefire.and.failsafe.report.dir>
 		<code.coverage.exclusions>
-			**/io/wkrzywiec/hexagonal/library/borrowing/model/**,
-			**/io/wkrzywiec/hexagonal/library/email/model/**,
-			**/io/wkrzywiec/hexagonal/library/inventory/model/**,
-			**/io/wkrzywiec/hexagonal/library/user/model/**,
-			**/io/wkrzywiec/hexagonal/library/infrastructure/repository/*Entity.java
+			**/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/**,
+			**/io/wkrzywiec/hexagonal/library/domain/email/core/model/**,
+			**/io/wkrzywiec/hexagonal/library/domain/inventory/core/model/**,
+			**/io/wkrzywiec/hexagonal/library/domain/user/core/model/**,
+			**/io/wkrzywiec/hexagonal/library/**/*Entity.java,
+			**/io/wkrzywiec/hexagonal/library/LibraryHexagonalApplication.java
 		</code.coverage.exclusions>
 	</properties>
 
@@ -58,11 +58,6 @@
 			<artifactId>jackson-module-jaxb-annotations</artifactId>
 			<version>2.11.0</version>
 		</dependency>
-		<dependency>
-			<groupId>io.vavr</groupId>
-			<artifactId>vavr</artifactId>
-			<version>0.10.3</version>
-		</dependency>
 
 		<dependency>
 			<groupId>com.h2database</groupId>

src/component-test/java/io/wkrzywiec/hexagonal/library/domain/borrowing/BorrowBookComponentTest.java

@@ -0,0 +1,83 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing;
+
+import io.restassured.RestAssured;
+import io.wkrzywiec.hexagonal.library.BookTestData;
+import io.wkrzywiec.hexagonal.library.UserTestData;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BookReservationCommand;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BorrowBookCommand;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.test.context.jdbc.Sql;
+
+import static io.restassured.RestAssured.given;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.springframework.test.context.jdbc.Sql.ExecutionPhase.AFTER_TEST_METHOD;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+public class BorrowBookComponentTest {
+
+    @LocalServerPort
+    private int port;
+
+    private String baseURL;
+
+    @Autowired
+    private JdbcTemplate jdbcTemplate;
+
+    @BeforeEach
+    public void init() {
+        this.baseURL = "http://localhost:" + port;
+        RestAssured.enableLoggingOfRequestAndResponseIfValidationFails();
+    }
+
+    @Test
+    @Disabled
+    @DisplayName("Borrow reserved book")
+    @Sql({"/book-and-user.sql", "/available-book.sql"})
+    @Sql(scripts = "/clean-database.sql", executionPhase = AFTER_TEST_METHOD)
+    public void givenBookIsReserved_thenBorrowIt_thenBookIsBorrowed() {
+        //given
+        Long homoDeusBookId = jdbcTemplate.queryForObject(
+                "SELECT id FROM book WHERE title = ?",
+                Long.class,
+                BookTestData.homoDeusBookTitle());
+
+        Long activeUserId = jdbcTemplate.queryForObject(
+                "SELECT id FROM user WHERE email = ?",
+                Long.class,
+                UserTestData.johnDoeEmail());
+
+        jdbcTemplate.update(
+                "INSERT INTO public.reserved (book_id, user_id) VALUES (?, ?)",
+                homoDeusBookId,
+                activeUserId);
+
+        BorrowBookCommand borrowBookCommand =
+                BorrowBookCommand.builder()
+                        .bookId(homoDeusBookId )
+                        .userId(activeUserId)
+                        .build();
+
+        //when
+        given()
+                .contentType("application/json")
+                .body(borrowBookCommand)
+                .when()
+                .post( baseURL + "/borrow")
+                .prettyPeek()
+                .then();
+
+        Long reservationId = jdbcTemplate.queryForObject(
+                "SELECT id FROM borrowed WHERE book_id = ?",
+                Long.class,
+                homoDeusBookId);
+
+        assertTrue(reservationId > 0);
+    }
+}

src/component-test/java/io/wkrzywiec/hexagonal/library/domain/borrowing/MakeReservationComponentTest.java

@@ -1,9 +1,10 @@
-package io.wkrzywiec.hexagonal.library.borrowing;
+package io.wkrzywiec.hexagonal.library.domain.borrowing;
 
 import io.restassured.RestAssured;
 import io.wkrzywiec.hexagonal.library.BookTestData;
-import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservationCommand;
-import io.wkrzywiec.hexagonal.library.inventory.infrastructure.BookRepository;
+import io.wkrzywiec.hexagonal.library.UserTestData;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BookReservationCommand;
+import io.wkrzywiec.hexagonal.library.domain.inventory.infrastructure.BookRepository;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -51,7 +52,7 @@ public class MakeReservationComponentTest {
         Long activeUserId = jdbcTemplate.queryForObject(
                 "SELECT id FROM user WHERE email = ?",
                 Long.class,
-                "john.doe@test.com");
+                UserTestData.johnDoeEmail());
 
         BookReservationCommand reservationCommand =
                 BookReservationCommand.builder()

src/component-test/java/io/wkrzywiec/hexagonal/library/domain/inventory/AddNewBookComponentTest.java

@@ -1,9 +1,9 @@
-package io.wkrzywiec.hexagonal.library.inventory;
+package io.wkrzywiec.hexagonal.library.domain.inventory;
 
 import io.restassured.RestAssured;
 import io.restassured.response.ValidatableResponse;
 import io.wkrzywiec.hexagonal.library.BookTestData;
-import io.wkrzywiec.hexagonal.library.inventory.model.AddNewBookCommand;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.AddNewBookCommand;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;

src/component-test/java/io/wkrzywiec/hexagonal/library/domain/user/AddNewUserComponentTest.java

@@ -1,7 +1,7 @@
-package io.wkrzywiec.hexagonal.library.user;
+package io.wkrzywiec.hexagonal.library.domain.user;
 
 import io.restassured.RestAssured;
-import io.wkrzywiec.hexagonal.library.user.model.AddUserCommand;
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.AddUserCommand;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;

src/main/java/io/wkrzywiec/hexagonal/library/BorrowingDomainConfig.java

@@ -1,29 +0,0 @@
-package io.wkrzywiec.hexagonal.library;
-
-import io.wkrzywiec.hexagonal.library.borrowing.BorrowingFacade;
-import io.wkrzywiec.hexagonal.library.borrowing.infrastructure.BorrowingDatabaseAdapter;
-import io.wkrzywiec.hexagonal.library.borrowing.infrastructure.SpringBorrowingEventPublisherAdapter;
-import io.wkrzywiec.hexagonal.library.borrowing.ports.incoming.MakeBookAvailable;
-import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingDatabase;
-import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingEventPublisher;
-import org.springframework.context.ApplicationEventPublisher;
-import org.springframework.context.annotation.Bean;
-import org.springframework.jdbc.core.JdbcTemplate;
-
-public class BorrowingDomainConfig {
-
-    @Bean
-    public BorrowingDatabase borrowingDatabase(JdbcTemplate jdbcTemplate) {
-        return new BorrowingDatabaseAdapter(jdbcTemplate);
-    }
-
-    @Bean
-    public BorrowingEventPublisher borrowingEventPublisher(ApplicationEventPublisher applicationEventPublisher){
-        return new SpringBorrowingEventPublisherAdapter(applicationEventPublisher);
-    }
-
-    @Bean
-    public MakeBookAvailable makeBookAvailable(BorrowingDatabase database, BorrowingEventPublisher borrowingEventPublisher) {
-        return new BorrowingFacade(database, borrowingEventPublisher);
-    }
-}

src/main/java/io/wkrzywiec/hexagonal/library/EmailDomainConfig.java

@@ -1,28 +0,0 @@
-package io.wkrzywiec.hexagonal.library;
-
-import io.wkrzywiec.hexagonal.library.email.EmailFacade;
-import io.wkrzywiec.hexagonal.library.email.infrastructure.EmailDatabaseAdapter;
-import io.wkrzywiec.hexagonal.library.email.infrastructure.SendGridEmailSender;
-import io.wkrzywiec.hexagonal.library.email.ports.incoming.SendReservationConfirmation;
-import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailSender;
-import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailDatabase;
-import org.springframework.context.annotation.Bean;
-import org.springframework.jdbc.core.JdbcTemplate;
-
-public class EmailDomainConfig {
-
-    @Bean
-    public EmailSender emailSender() {
-        return new SendGridEmailSender();
-    }
-
-    @Bean
-    public EmailDatabase libraryDatabase(JdbcTemplate jdbcTemplate){
-        return new EmailDatabaseAdapter(jdbcTemplate);
-    }
-
-    @Bean
-    public SendReservationConfirmation sendReservationConfirmation(EmailSender emailSender, EmailDatabase database){
-        return new EmailFacade(emailSender, database);
-    }
-}

src/main/java/io/wkrzywiec/hexagonal/library/LibraryHexagonalApplication.java

@@ -1,10 +1,17 @@
 package io.wkrzywiec.hexagonal.library;
 
+import io.wkrzywiec.hexagonal.library.infrastructure.BorrowingDomainConfig;
+import io.wkrzywiec.hexagonal.library.infrastructure.EmailDomainConfig;
+import io.wkrzywiec.hexagonal.library.infrastructure.InventoryDomainConfig;
+import io.wkrzywiec.hexagonal.library.infrastructure.LibraryHexagonalConfig;
+import io.wkrzywiec.hexagonal.library.infrastructure.UserDomainConfig;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Import;
+import org.springframework.scheduling.annotation.EnableScheduling;
 
 @SpringBootApplication
+@EnableScheduling
 @Import({
 		LibraryHexagonalConfig.class,
 		InventoryDomainConfig.class,

src/main/java/io/wkrzywiec/hexagonal/library/UserDomainConfig.java

@@ -1,21 +0,0 @@
-package io.wkrzywiec.hexagonal.library;
-
-import io.wkrzywiec.hexagonal.library.user.UserFacade;
-import io.wkrzywiec.hexagonal.library.user.infrastructure.UserDatabaseAdapter;
-import io.wkrzywiec.hexagonal.library.user.infrastructure.UserRepository;
-import io.wkrzywiec.hexagonal.library.user.ports.incoming.AddNewUser;
-import io.wkrzywiec.hexagonal.library.user.ports.outgoing.UserDatabase;
-import org.springframework.context.annotation.Bean;
-
-public class UserDomainConfig {
-
-    @Bean
-    public UserDatabase userDatabase(UserRepository userRepository){
-        return new UserDatabaseAdapter(userRepository);
-    }
-
-    @Bean
-    public AddNewUser addNewUser(UserDatabase userDatabase){
-        return new UserFacade(userDatabase);
-    }
-}

src/main/java/io/wkrzywiec/hexagonal/library/application/LibraryHexagonalController.java

@@ -0,0 +1,15 @@
+package io.wkrzywiec.hexagonal.library.application;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/")
+public class LibraryHexagonalController {
+
+    @GetMapping("")
+    public String getAppRoot(){
+        return "Library Hexagonal REST API";
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/BorrowingFacade.java

@@ -1,47 +0,0 @@
-package io.wkrzywiec.hexagonal.library.borrowing;
-
-import io.wkrzywiec.hexagonal.library.borrowing.model.ActiveUser;
-import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservedEvent;
-import io.wkrzywiec.hexagonal.library.borrowing.model.MakeBookAvailableCommand;
-import io.wkrzywiec.hexagonal.library.borrowing.model.ReservationDetails;
-import io.wkrzywiec.hexagonal.library.borrowing.model.exception.ActiveUserNotFoundException;
-import io.wkrzywiec.hexagonal.library.borrowing.model.AvailableBook;
-import io.wkrzywiec.hexagonal.library.borrowing.model.exception.AvailableBookNotFoundExeption;
-import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservationCommand;
-import io.wkrzywiec.hexagonal.library.borrowing.model.ReservedBook;
-import io.wkrzywiec.hexagonal.library.borrowing.ports.incoming.MakeBookAvailable;
-import io.wkrzywiec.hexagonal.library.borrowing.ports.incoming.ReserveBook;
-import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingDatabase;
-import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingEventPublisher;
-
-public class BorrowingFacade implements MakeBookAvailable, ReserveBook {
-
-    private final BorrowingDatabase database;
-    private final BorrowingEventPublisher eventPublisher;
-
-    public BorrowingFacade(BorrowingDatabase database, BorrowingEventPublisher eventPublisher) {
-        this.database = database;
-        this.eventPublisher = eventPublisher;
-    }
-
-    @Override
-    public void handle(MakeBookAvailableCommand bookAvailableCommand) {
-        database.setBookAvailable(bookAvailableCommand.getBookId());
-    }
-
-    @Override
-    public Long handle(BookReservationCommand bookReservation) {
-        AvailableBook availableBook =
-                database.getAvailableBook(bookReservation.getBookId())
-                .orElseThrow(() -> new AvailableBookNotFoundExeption(bookReservation.getBookId()));
-
-        ActiveUser activeUser =
-                database.getActiveUser(bookReservation.getUserId())
-                .orElseThrow(() -> new ActiveUserNotFoundException(bookReservation.getUserId()));
-
-        ReservedBook reservedBook = activeUser.reserve(availableBook);
-        ReservationDetails reservationDetails = database.save(reservedBook);
-        eventPublisher.publish(new BookReservedEvent(reservationDetails));
-        return reservationDetails.getReservationId().getIdAsLong();
-    }
-}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/infrastructure/BorrowingDatabaseAdapter.java

@@ -1,82 +0,0 @@
-package io.wkrzywiec.hexagonal.library.borrowing.infrastructure;
-
-import io.wkrzywiec.hexagonal.library.borrowing.model.ActiveUser;
-import io.wkrzywiec.hexagonal.library.borrowing.model.AvailableBook;
-import io.wkrzywiec.hexagonal.library.borrowing.model.ReservationDetails;
-import io.wkrzywiec.hexagonal.library.borrowing.model.ReservationId;
-import io.wkrzywiec.hexagonal.library.borrowing.model.ReservedBook;
-import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingDatabase;
-import lombok.RequiredArgsConstructor;
-import org.springframework.dao.DataAccessException;
-import org.springframework.jdbc.core.JdbcTemplate;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Optional;
-
-@RequiredArgsConstructor
-public class BorrowingDatabaseAdapter implements BorrowingDatabase {
-
-    private final JdbcTemplate jdbcTemplate;
-
-    @Override
-    public void setBookAvailable(Long bookId) {
-        jdbcTemplate.update(
-                "INSERT INTO available (book_id) VALUES (?)",
-                bookId);
-    }
-
-    @Override
-    public Optional<AvailableBook> getAvailableBook(Long bookId) {
-        try {
-            return Optional.ofNullable(
-                    jdbcTemplate.queryForObject(
-                    "SELECT book_id FROM available WHERE book_id = ?",
-                    AvailableBook.class,
-                            bookId));
-        } catch (DataAccessException exception) {
-            return Optional.empty();
-        }
-    }
-
-    @Override
-    public Optional<ActiveUser> getActiveUser(Long userId) {
-        try {
-            jdbcTemplate.queryForObject(
-                            "SELECT id FROM public.user as u WHERE u.id = ?",
-                            Long.class,
-                            userId);
-        } catch (DataAccessException exception) {
-            return Optional.empty();
-        }
-
-        List<ReservedBook> reservedBooksByUser = getReservedBooksByUser(userId);
-        return Optional.of(new ActiveUser(userId, reservedBooksByUser));
-    }
-
-    private List<ReservedBook> getReservedBooksByUser(Long userId) {
-        try {
-            return jdbcTemplate.queryForList(
-                    "SELECT book_id FROM reserved WHERE reserved.user_id = ?",
-                    ReservedBook.class,
-                    userId
-            );
-        } catch (DataAccessException exception){
-            return new ArrayList<>();
-        }
-    }
-
-    @Override
-    public ReservationDetails save(ReservedBook reservedBook) {
-       jdbcTemplate.update(
-               "INSERT INTO reserved (book_id, user_id) VALUES (?, ?)",
-               reservedBook.getIdAsLong(),
-               reservedBook.getAssignedUserIdAsLong());
-
-       ReservationId reservationId = jdbcTemplate.queryForObject(
-               "SELECT id FROM reserved WHERE book_id = ?",
-               ReservationId.class,
-               reservedBook.getIdAsLong());
-       return new ReservationDetails(reservationId, reservedBook);
-    }
-}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/model/ActiveUser.java

@@ -1,36 +0,0 @@
-package io.wkrzywiec.hexagonal.library.borrowing.model;
-
-import io.wkrzywiec.hexagonal.library.borrowing.model.exception.TooManyBooksAssignedToUserException;
-import lombok.EqualsAndHashCode;
-
-import java.util.List;
-
-@EqualsAndHashCode
-public class ActiveUser {
-
-    private final Long id;
-    private final List<ReservedBook> reservedBooks;
-
-    public ActiveUser(Long id, List<ReservedBook> reservedBooks) {
-        this.id = id;
-        this.reservedBooks = reservedBooks;
-    }
-
-    public ReservedBook reserve(AvailableBook availableBook){
-        if (reservedBooks.size() < 3){
-            ReservedBook reservedBook = new ReservedBook(availableBook.getIdAsLong(), id);
-            reservedBooks.add(reservedBook);
-            return reservedBook;
-        } else {
-            throw new TooManyBooksAssignedToUserException(id);
-        }
-    }
-
-    public Long getIdAsLong(){
-        return id;
-    }
-
-    public List<ReservedBook> getReservedBookList(){
-        return reservedBooks;
-    }
-}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/model/Book.java

@@ -1,5 +0,0 @@
-package io.wkrzywiec.hexagonal.library.borrowing.model;
-
-interface Book {
-    Long getIdAsLong();
-}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/ports/incoming/BorrowBook.java

@@ -1,4 +0,0 @@
-package io.wkrzywiec.hexagonal.library.borrowing.ports.incoming;
-
-public interface BorrowBook {
-}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/ports/incoming/CancelReservation.java

@@ -1,4 +0,0 @@
-package io.wkrzywiec.hexagonal.library.borrowing.ports.incoming;
-
-public interface CancelReservation {
-}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/ports/incoming/GiveBackBook.java

@@ -1,4 +0,0 @@
-package io.wkrzywiec.hexagonal.library.borrowing.ports.incoming;
-
-public interface GiveBackBook {
-}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/ports/incoming/MakeBookAvailable.java

@@ -1,7 +0,0 @@
-package io.wkrzywiec.hexagonal.library.borrowing.ports.incoming;
-
-import io.wkrzywiec.hexagonal.library.borrowing.model.MakeBookAvailableCommand;
-
-public interface MakeBookAvailable {
-    void handle(MakeBookAvailableCommand bookAvailableCommand);
-}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/ports/incoming/ReserveBook.java

@@ -1,7 +0,0 @@
-package io.wkrzywiec.hexagonal.library.borrowing.ports.incoming;
-
-import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservationCommand;
-
-public interface ReserveBook {
-    Long handle(BookReservationCommand bookReservation);
-}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/ports/outgoing/BorrowingDatabase.java

@@ -1,15 +0,0 @@
-package io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing;
-
-import io.wkrzywiec.hexagonal.library.borrowing.model.ActiveUser;
-import io.wkrzywiec.hexagonal.library.borrowing.model.AvailableBook;
-import io.wkrzywiec.hexagonal.library.borrowing.model.ReservationDetails;
-import io.wkrzywiec.hexagonal.library.borrowing.model.ReservedBook;
-
-import java.util.Optional;
-
-public interface BorrowingDatabase {
-    void setBookAvailable(Long bookId);
-    Optional<AvailableBook> getAvailableBook(Long bookId);
-    Optional<ActiveUser> getActiveUser(Long userId);
-    ReservationDetails save(ReservedBook reservedBook);
-}

src/main/java/io/wkrzywiec/hexagonal/library/borrowing/ports/outgoing/BorrowingEventPublisher.java

@@ -1,7 +0,0 @@
-package io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing;
-
-import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservedEvent;
-
-public interface BorrowingEventPublisher {
-    public void publish(BookReservedEvent event);
-}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/application/BorrowBookController.java

@@ -0,0 +1,27 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.application;
+
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BorrowBookCommand;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming.BorrowBook;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/borrow")
+@RequiredArgsConstructor
+public class BorrowBookController {
+
+    @Qualifier("BorrowBook")
+    private final BorrowBook borrowBook;
+
+    @PostMapping("")
+    public ResponseEntity<String> borrowBook(@RequestBody BorrowBookCommand borrowBookCommand){
+        borrowBook.handle(borrowBookCommand);
+        return new ResponseEntity<>("Book with an id " + borrowBookCommand.getBookId() + " was borrowed", HttpStatus.CREATED);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/application/NewBookWasAddedEventHandler.java

@@ -1,9 +1,10 @@
-package io.wkrzywiec.hexagonal.library.borrowing.application;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.application;
 
-import io.wkrzywiec.hexagonal.library.borrowing.model.MakeBookAvailableCommand;
-import io.wkrzywiec.hexagonal.library.borrowing.ports.incoming.MakeBookAvailable;
-import io.wkrzywiec.hexagonal.library.inventory.model.NewBookWasAddedEvent;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.MakeBookAvailableCommand;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming.MakeBookAvailable;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.NewBookWasAddedEvent;
 import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.context.event.EventListener;
 import org.springframework.stereotype.Component;
 
@@ -11,6 +12,7 @@ import org.springframework.stereotype.Component;
 @Component
 public class NewBookWasAddedEventHandler {
 
+    @Qualifier("MakeBookAvailable")
     private final MakeBookAvailable makeBookAvailable;
 
     @EventListener

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/application/OverdueReservationScheduler.java

@@ -0,0 +1,18 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.application;
+
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming.CancelOverdueReservations;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.scheduling.annotation.Scheduled;
+
+@RequiredArgsConstructor
+public class OverdueReservationScheduler {
+
+    @Qualifier("CancelOverdueReservations")
+    private final CancelOverdueReservations overdueReservations;
+
+    @Scheduled(fixedRate = 10 * 1000)
+    public void checkOverdueReservations(){
+        overdueReservations.cancelOverdueReservations();
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/application/ReservationController.java

@@ -1,8 +1,9 @@
-package io.wkrzywiec.hexagonal.library.borrowing.application;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.application;
 
-import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservationCommand;
-import io.wkrzywiec.hexagonal.library.borrowing.ports.incoming.ReserveBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BookReservationCommand;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming.ReserveBook;
 import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -15,6 +16,7 @@ import org.springframework.web.bind.annotation.RestController;
 @RequiredArgsConstructor
 public class ReservationController {
 
+    @Qualifier("ReserveBook")
     private final ReserveBook reserveBook;
 
     @PostMapping("")

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/BorrowingFacade.java

@@ -0,0 +1,80 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core;
+
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.ActiveUser;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.AvailableBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BookReservationCommand;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BookReservedEvent;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BorrowBookCommand;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BorrowedBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.DueDate;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.MakeBookAvailableCommand;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.OverdueReservation;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.ReservationDetails;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.ReservedBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.exception.ActiveUserNotFoundException;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.exception.AvailableBookNotFoundExeption;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.exception.ReservedBookNotFoundException;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming.BorrowBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming.CancelOverdueReservations;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming.MakeBookAvailable;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming.ReserveBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.outgoing.BorrowingDatabase;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.outgoing.BorrowingEventPublisher;
+
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+import java.util.List;
+import java.util.Optional;
+
+public class BorrowingFacade implements MakeBookAvailable, ReserveBook, CancelOverdueReservations, BorrowBook {
+
+    private final BorrowingDatabase database;
+    private final BorrowingEventPublisher eventPublisher;
+
+    public BorrowingFacade(BorrowingDatabase database, BorrowingEventPublisher eventPublisher) {
+        this.database = database;
+        this.eventPublisher = eventPublisher;
+    }
+
+    @Override
+    public void handle(MakeBookAvailableCommand bookAvailableCommand) {
+        database.setBookAvailable(bookAvailableCommand.getBookId());
+    }
+
+    @Override
+    public Long handle(BookReservationCommand bookReservation) {
+        AvailableBook availableBook =
+                database.getAvailableBook(bookReservation.getBookId())
+                .orElseThrow(() -> new AvailableBookNotFoundExeption(bookReservation.getBookId()));
+
+        ActiveUser activeUser =
+                database.getActiveUser(bookReservation.getUserId())
+                .orElseThrow(() -> new ActiveUserNotFoundException(bookReservation.getUserId()));
+
+        ReservedBook reservedBook = activeUser.reserve(availableBook);
+        ReservationDetails reservationDetails = database.save(reservedBook);
+        eventPublisher.publish(new BookReservedEvent(reservationDetails));
+        return reservationDetails.getReservationId().getIdAsLong();
+    }
+
+    @Override
+    public void cancelOverdueReservations() {
+        DueDate dueDate = new DueDate(Instant.now().plus(3L, ChronoUnit.DAYS));
+        List<OverdueReservation> overdueReservationList = database.findReservationsAfter(dueDate);
+        overdueReservationList.forEach(
+                overdue -> database.setBookAvailable(overdue.getBookIdentificationAsLong()));
+    }
+
+    @Override
+    public void handle(BorrowBookCommand borrowBookCommand) {
+        ActiveUser activeUser =
+                database.getActiveUser(borrowBookCommand.getUserId())
+                        .orElseThrow(() -> new ActiveUserNotFoundException(borrowBookCommand.getUserId()));
+        ReservedBook reservedBook =
+                database.getReservedBook(borrowBookCommand.getBookId())
+                .orElseThrow(() -> new ReservedBookNotFoundException(borrowBookCommand.getBookId()));
+
+        BorrowedBook borrowedBook = activeUser.borrow(reservedBook);
+        database.save(borrowedBook);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/ActiveUser.java

@@ -0,0 +1,56 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
+
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.exception.TooManyBooksAssignedToUserException;
+import lombok.EqualsAndHashCode;
+
+import java.util.List;
+
+@EqualsAndHashCode
+public class ActiveUser {
+
+    private final Long id;
+    private final List<ReservedBook> reservedBooks;
+    private final List<BorrowedBook> borrowedBooks;
+
+    public ActiveUser(Long id, List<ReservedBook> reservedBooks, List<BorrowedBook> borrowedBooks) {
+        this.id = id;
+        this.reservedBooks = reservedBooks;
+        this.borrowedBooks = borrowedBooks;
+    }
+
+    public ReservedBook reserve(AvailableBook availableBook){
+        if (hasUserNotReachedLimitOfBooks()){
+            ReservedBook reservedBook = new ReservedBook(availableBook.getIdAsLong(), id);
+            reservedBooks.add(reservedBook);
+            return reservedBook;
+        } else {
+            throw new TooManyBooksAssignedToUserException(id);
+        }
+    }
+
+    public BorrowedBook borrow(ReservedBook reservedBook) {
+        if (hasUserNotReachedLimitOfBooks()){
+            BorrowedBook borrowedBook = new BorrowedBook(reservedBook.getIdAsLong(), id);
+            borrowedBooks.add(borrowedBook);
+            return borrowedBook;
+        } else {
+            throw new TooManyBooksAssignedToUserException(id);
+        }
+    }
+
+    public Long getIdAsLong(){
+        return id;
+    }
+
+    public List<ReservedBook> getReservedBookList(){
+        return reservedBooks;
+    }
+
+    public List<BorrowedBook> getBorrowedBookList() {
+        return borrowedBooks;
+    }
+
+    private boolean hasUserNotReachedLimitOfBooks(){
+        return reservedBooks.size() + borrowedBooks.size() < 3;
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/AvailableBook.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.borrowing.model;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
 
 import lombok.EqualsAndHashCode;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/Book.java

@@ -0,0 +1,5 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
+
+interface Book {
+    Long getIdAsLong();
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/BookReservationCommand.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.borrowing.model;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
 
 import lombok.AllArgsConstructor;
 import lombok.Builder;

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/BookReservedEvent.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.borrowing.model;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
 
 import java.time.Instant;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/BorrowBookCommand.java

@@ -0,0 +1,13 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+
+@AllArgsConstructor
+@Getter
+@Builder
+public class BorrowBookCommand {
+    private Long bookId;
+    private Long userId;
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/BorrowedBook.java

@@ -0,0 +1,32 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
+
+import lombok.EqualsAndHashCode;
+
+import java.time.Instant;
+
+@EqualsAndHashCode
+public class BorrowedBook implements Book {
+
+    private final Long bookId;
+    private final Long userId;
+    private final Instant borrowedDate;
+
+    public BorrowedBook(Long bookId, Long userId) {
+        this.bookId = bookId;
+        this.userId = userId;
+        this.borrowedDate = Instant.now();
+    }
+
+    @Override
+    public Long getIdAsLong() {
+        return bookId;
+    }
+
+    public Long getAssignedUserIdAsLong(){
+        return userId;
+    }
+
+    public Instant getBorrowedDateAsInstant(){
+        return borrowedDate;
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/DueDate.java

@@ -0,0 +1,14 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
+
+import lombok.AllArgsConstructor;
+
+import java.time.Instant;
+
+@AllArgsConstructor
+public class DueDate {
+    private final Instant timeStamp;
+
+    public Instant asInstant(){
+        return timeStamp;
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/MakeBookAvailableCommand.java

@@ -1,10 +1,8 @@
-package io.wkrzywiec.hexagonal.library.borrowing.model;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
 
 import lombok.AllArgsConstructor;
 import lombok.Builder;
-import lombok.Data;
 import lombok.Getter;
-import lombok.NoArgsConstructor;
 
 @AllArgsConstructor
 @Getter

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/OverdueReservation.java

@@ -0,0 +1,13 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
+
+import lombok.AllArgsConstructor;
+
+@AllArgsConstructor
+public class OverdueReservation {
+    private Long reservationId;
+    private Long bookIdentification;
+
+    public Long getBookIdentificationAsLong() {
+        return bookIdentification;
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/ReservationDetails.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.borrowing.model;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
 
 import lombok.EqualsAndHashCode;
 import lombok.Getter;

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/ReservationId.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.borrowing.model;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
 
 import lombok.EqualsAndHashCode;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/ReservedBook.java

@@ -1,16 +1,20 @@
-package io.wkrzywiec.hexagonal.library.borrowing.model;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model;
 
 import lombok.EqualsAndHashCode;
 
+import java.time.Instant;
+
 @EqualsAndHashCode
 public class ReservedBook implements Book {
 
     private final Long bookId;
     private final Long userId;
+    private final Instant reservedDate;
 
     public ReservedBook(Long bookId, Long userId) {
         this.bookId = bookId;
         this.userId = userId;
+        this.reservedDate = Instant.now();
     }
 
     @Override
@@ -21,4 +25,8 @@ public class ReservedBook implements Book {
     public Long getAssignedUserIdAsLong(){
         return userId;
     }
+
+    public Instant getReservedDateAsInstant(){
+        return reservedDate;
+    }
 }

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/exception/ActiveUserNotFoundException.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.borrowing.model.exception;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.exception;
 
 public class ActiveUserNotFoundException extends RuntimeException {
     public ActiveUserNotFoundException(Long bookId){

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/exception/AvailableBookNotFoundExeption.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.borrowing.model.exception;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.exception;
 
 public class AvailableBookNotFoundExeption extends RuntimeException {
     public AvailableBookNotFoundExeption(Long bookId){

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/exception/ReservedBookNotFoundException.java

@@ -0,0 +1,10 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.exception;
+
+public class ReservedBookNotFoundException extends RuntimeException {
+    public ReservedBookNotFoundException(Long bookId) {
+        super("There is no reserved book with an ID: " + bookId,
+                null,
+                false,
+                false);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/model/exception/TooManyBooksAssignedToUserException.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.borrowing.model.exception;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.exception;
 
 public class TooManyBooksAssignedToUserException extends RuntimeException {
     public TooManyBooksAssignedToUserException(Long userId){

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/ports/incoming/BorrowBook.java

@@ -0,0 +1,7 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming;
+
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BorrowBookCommand;
+
+public interface BorrowBook {
+    void handle(BorrowBookCommand borrowBookCommand);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/ports/incoming/CancelOverdueReservations.java

@@ -0,0 +1,5 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming;
+
+public interface CancelOverdueReservations {
+    void cancelOverdueReservations();
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/ports/incoming/GiveBackBook.java

@@ -0,0 +1,4 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming;
+
+public interface GiveBackBook {
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/ports/incoming/MakeBookAvailable.java

@@ -0,0 +1,7 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming;
+
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.MakeBookAvailableCommand;
+
+public interface MakeBookAvailable {
+    void handle(MakeBookAvailableCommand bookAvailableCommand);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/ports/incoming/ReserveBook.java

@@ -0,0 +1,7 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming;
+
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BookReservationCommand;
+
+public interface ReserveBook {
+    Long handle(BookReservationCommand bookReservation);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/ports/outgoing/BorrowingDatabase.java

@@ -0,0 +1,22 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.outgoing;
+
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.ActiveUser;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.AvailableBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BorrowedBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.DueDate;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.OverdueReservation;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.ReservationDetails;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.ReservedBook;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface BorrowingDatabase {
+    void setBookAvailable(Long bookId);
+    Optional<AvailableBook> getAvailableBook(Long bookId);
+    Optional<ActiveUser> getActiveUser(Long userId);
+    ReservationDetails save(ReservedBook reservedBook);
+    void save(BorrowedBook borrowedBook);
+    List<OverdueReservation> findReservationsAfter(DueDate dueDate);
+    Optional<ReservedBook> getReservedBook(Long bookId);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/core/ports/outgoing/BorrowingEventPublisher.java

@@ -0,0 +1,7 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.outgoing;
+
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BookReservedEvent;
+
+public interface BorrowingEventPublisher {
+    public void publish(BookReservedEvent event);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/infrastructure/BorrowingDatabaseAdapter.java

@@ -0,0 +1,149 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.infrastructure;
+
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BorrowedBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.infrastructure.entity.OverdueReservationEntity;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.ActiveUser;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.AvailableBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.DueDate;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.OverdueReservation;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.ReservationDetails;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.ReservationId;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.ReservedBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.outgoing.BorrowingDatabase;
+import lombok.RequiredArgsConstructor;
+import org.springframework.dao.DataAccessException;
+import org.springframework.jdbc.core.BeanPropertyRowMapper;
+import org.springframework.jdbc.core.JdbcTemplate;
+
+import java.sql.Timestamp;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+@RequiredArgsConstructor
+public class BorrowingDatabaseAdapter implements BorrowingDatabase {
+
+    private final JdbcTemplate jdbcTemplate;
+
+    @Override
+    public void setBookAvailable(Long bookId) {
+        jdbcTemplate.update(
+                "INSERT INTO available (book_id) VALUES (?)",
+                bookId);
+
+        jdbcTemplate.update(
+                "DELETE FROM reserved WHERE book_id = ?",
+                bookId);
+
+        jdbcTemplate.update(
+                "DELETE FROM borrowed WHERE book_id = ?",
+                bookId);
+    }
+
+    @Override
+    public Optional<AvailableBook> getAvailableBook(Long bookId) {
+        try {
+            return Optional.ofNullable(
+                    jdbcTemplate.queryForObject(
+                    "SELECT book_id FROM available WHERE book_id = ?",
+                    AvailableBook.class,
+                            bookId));
+        } catch (DataAccessException exception) {
+            return Optional.empty();
+        }
+    }
+
+    @Override
+    public Optional<ActiveUser> getActiveUser(Long userId) {
+        try {
+            jdbcTemplate.queryForObject(
+                            "SELECT id FROM public.user as u WHERE u.id = ?",
+                            Long.class,
+                            userId);
+        } catch (DataAccessException exception) {
+            return Optional.empty();
+        }
+
+        List<ReservedBook> reservedBooksByUser = getReservedBooksByUser(userId);
+        List<BorrowedBook> borrowedBooksByUser = getBorrowedBooksByUser(userId);
+        return Optional.of(new ActiveUser(userId, reservedBooksByUser, borrowedBooksByUser));
+    }
+
+    @Override
+    public ReservationDetails save(ReservedBook reservedBook) {
+       jdbcTemplate.update(
+               "INSERT INTO reserved (book_id, user_id, reserved_date) VALUES (?, ?, ?)",
+               reservedBook.getIdAsLong(),
+               reservedBook.getAssignedUserIdAsLong(),
+               reservedBook.getReservedDateAsInstant());
+
+        jdbcTemplate.update(
+                "DELETE FROM available WHERE book_id = ?",
+                reservedBook.getIdAsLong());
+
+       ReservationId reservationId = jdbcTemplate.queryForObject(
+               "SELECT id FROM reserved WHERE book_id = ?",
+               ReservationId.class,
+               reservedBook.getIdAsLong());
+       return new ReservationDetails(reservationId, reservedBook);
+    }
+
+    @Override
+    public void save(BorrowedBook borrowedBook) {
+        jdbcTemplate.update(
+                "INSERT INTO borrowed (book_id, user_id, borrowed_date) VALUES (?, ?, ?)",
+                borrowedBook.getIdAsLong(),
+                borrowedBook.getAssignedUserIdAsLong(),
+                borrowedBook.getBorrowedDateAsInstant());
+
+        jdbcTemplate.update(
+                "DELETE FROM reserved WHERE book_id = ?",
+                borrowedBook.getIdAsLong());
+
+        jdbcTemplate.update(
+                "DELETE FROM available WHERE book_id = ?",
+                borrowedBook.getIdAsLong());
+
+    }
+
+    @Override
+    public List<OverdueReservation> findReservationsAfter(DueDate dueDate) {
+        List<OverdueReservationEntity> entities = jdbcTemplate.query(
+                "SELECT id AS reservationId, book_id AS bookIdentification FROM reserved WHERE reserved_date > ?",
+                new BeanPropertyRowMapper<OverdueReservationEntity>(OverdueReservationEntity.class),
+                Timestamp.from(dueDate.asInstant()));
+        return entities.stream()
+                .map(entity -> new OverdueReservation(entity.getReservationId(), entity.getBookIdentification()))
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public Optional<ReservedBook> getReservedBook(Long bookId) {
+        try {
+            return Optional.ofNullable(
+                    jdbcTemplate.queryForObject(
+                            "SELECT book_id AS bookId, user_id AS userId, reserved_date AS reservedDate FROM reserved WHERE reserved.book_id = ?",
+                            ReservedBook.class,
+                            bookId));
+        } catch (DataAccessException exception) {
+            return Optional.empty();
+        }
+    }
+
+    private List<ReservedBook> getReservedBooksByUser(Long userId) {
+        try {
+            return jdbcTemplate.queryForList(
+                    "SELECT book_id FROM reserved WHERE reserved.user_id = ?",
+                    ReservedBook.class,
+                    userId
+            );
+        } catch (DataAccessException exception){
+            return new ArrayList<>();
+        }
+    }
+
+    private List<BorrowedBook> getBorrowedBooksByUser(Long userId) {
+        return new ArrayList<>();
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/infrastructure/SpringBorrowingEventPublisherAdapter.java

@@ -1,7 +1,7 @@
-package io.wkrzywiec.hexagonal.library.borrowing.infrastructure;
+package io.wkrzywiec.hexagonal.library.domain.borrowing.infrastructure;
 
-import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservedEvent;
-import io.wkrzywiec.hexagonal.library.borrowing.ports.outgoing.BorrowingEventPublisher;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BookReservedEvent;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.outgoing.BorrowingEventPublisher;
 import lombok.RequiredArgsConstructor;
 import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.stereotype.Component;

src/main/java/io/wkrzywiec/hexagonal/library/domain/borrowing/infrastructure/entity/OverdueReservationEntity.java

@@ -0,0 +1,9 @@
+package io.wkrzywiec.hexagonal.library.domain.borrowing.infrastructure.entity;
+
+import lombok.Data;
+
+@Data
+public class OverdueReservationEntity {
+    private Long reservationId;
+    private Long bookIdentification;
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/email/application/BookReservedEventHandler.java

@@ -1,8 +1,8 @@
-package io.wkrzywiec.hexagonal.library.email.application;
+package io.wkrzywiec.hexagonal.library.domain.email.application;
 
-import io.wkrzywiec.hexagonal.library.borrowing.model.BookReservedEvent;
-import io.wkrzywiec.hexagonal.library.email.model.SendReservationConfirmationCommand;
-import io.wkrzywiec.hexagonal.library.email.ports.incoming.SendReservationConfirmation;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.model.BookReservedEvent;
+import io.wkrzywiec.hexagonal.library.domain.email.core.model.SendReservationConfirmationCommand;
+import io.wkrzywiec.hexagonal.library.domain.email.core.ports.incoming.SendReservationConfirmation;
 import lombok.RequiredArgsConstructor;
 import org.springframework.context.event.EventListener;
 import org.springframework.stereotype.Component;

src/main/java/io/wkrzywiec/hexagonal/library/domain/email/core/EmailCreator.java

@@ -1,7 +1,7 @@
-package io.wkrzywiec.hexagonal.library.email;
+package io.wkrzywiec.hexagonal.library.domain.email.core;
 
-import io.wkrzywiec.hexagonal.library.email.model.EmailAddress;
-import io.wkrzywiec.hexagonal.library.email.model.ReservationConfirmEmail;
+import io.wkrzywiec.hexagonal.library.domain.email.core.model.EmailAddress;
+import io.wkrzywiec.hexagonal.library.domain.email.core.model.ReservationConfirmEmail;
 
 class EmailCreator {
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/email/core/EmailFacade.java

@@ -1,10 +1,10 @@
-package io.wkrzywiec.hexagonal.library.email;
+package io.wkrzywiec.hexagonal.library.domain.email.core;
 
-import io.wkrzywiec.hexagonal.library.email.model.ReservationConfirmEmail;
-import io.wkrzywiec.hexagonal.library.email.model.SendReservationConfirmationCommand;
-import io.wkrzywiec.hexagonal.library.email.ports.incoming.SendReservationConfirmation;
-import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailSender;
-import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailDatabase;
+import io.wkrzywiec.hexagonal.library.domain.email.core.model.ReservationConfirmEmail;
+import io.wkrzywiec.hexagonal.library.domain.email.core.model.SendReservationConfirmationCommand;
+import io.wkrzywiec.hexagonal.library.domain.email.core.ports.incoming.SendReservationConfirmation;
+import io.wkrzywiec.hexagonal.library.domain.email.core.ports.outgoing.EmailSender;
+import io.wkrzywiec.hexagonal.library.domain.email.core.ports.outgoing.EmailDatabase;
 import lombok.RequiredArgsConstructor;
 
 @RequiredArgsConstructor

src/main/java/io/wkrzywiec/hexagonal/library/domain/email/core/model/EmailAddress.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.email.model;
+package io.wkrzywiec.hexagonal.library.domain.email.core.model;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;

src/main/java/io/wkrzywiec/hexagonal/library/domain/email/core/model/ReservationConfirmEmail.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.email.model;
+package io.wkrzywiec.hexagonal.library.domain.email.core.model;
 
 import lombok.RequiredArgsConstructor;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/email/core/model/SendReservationConfirmationCommand.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.email.model;
+package io.wkrzywiec.hexagonal.library.domain.email.core.model;
 
 import lombok.Getter;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/email/core/ports/incoming/SendReservationConfirmation.java

@@ -0,0 +1,7 @@
+package io.wkrzywiec.hexagonal.library.domain.email.core.ports.incoming;
+
+import io.wkrzywiec.hexagonal.library.domain.email.core.model.SendReservationConfirmationCommand;
+
+public interface SendReservationConfirmation {
+    void handle(SendReservationConfirmationCommand reservationConfirmationCommand);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/email/core/ports/outgoing/EmailDatabase.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.email.ports.outgoing;
+package io.wkrzywiec.hexagonal.library.domain.email.core.ports.outgoing;
 
 import java.util.Optional;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/email/core/ports/outgoing/EmailSender.java

@@ -0,0 +1,8 @@
+package io.wkrzywiec.hexagonal.library.domain.email.core.ports.outgoing;
+
+
+import io.wkrzywiec.hexagonal.library.domain.email.core.model.ReservationConfirmEmail;
+
+public interface EmailSender {
+    void sendReservationConfirmationEmail(ReservationConfirmEmail reservationConfirmEmail);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/email/infrastructure/EmailDatabaseAdapter.java

@@ -1,6 +1,6 @@
-package io.wkrzywiec.hexagonal.library.email.infrastructure;
+package io.wkrzywiec.hexagonal.library.domain.email.infrastructure;
 
-import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailDatabase;
+import io.wkrzywiec.hexagonal.library.domain.email.core.ports.outgoing.EmailDatabase;
 import lombok.RequiredArgsConstructor;
 import org.springframework.dao.DataAccessException;
 import org.springframework.jdbc.core.JdbcTemplate;

src/main/java/io/wkrzywiec/hexagonal/library/domain/email/infrastructure/SendGridEmailSender.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.email.infrastructure;
+package io.wkrzywiec.hexagonal.library.domain.email.infrastructure;
 
 import com.sendgrid.Method;
 import com.sendgrid.Request;
@@ -6,8 +6,8 @@ import com.sendgrid.SendGrid;
 import com.sendgrid.helpers.mail.Mail;
 import com.sendgrid.helpers.mail.objects.Content;
 import com.sendgrid.helpers.mail.objects.Email;
-import io.wkrzywiec.hexagonal.library.email.model.ReservationConfirmEmail;
-import io.wkrzywiec.hexagonal.library.email.ports.outgoing.EmailSender;
+import io.wkrzywiec.hexagonal.library.domain.email.core.model.ReservationConfirmEmail;
+import io.wkrzywiec.hexagonal.library.domain.email.core.ports.outgoing.EmailSender;
 
 import java.io.IOException;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/application/BookCommandController.java

@@ -1,7 +1,7 @@
-package io.wkrzywiec.hexagonal.library.inventory.application;
+package io.wkrzywiec.hexagonal.library.domain.inventory.application;
 
-import io.wkrzywiec.hexagonal.library.inventory.model.AddNewBookCommand;
-import io.wkrzywiec.hexagonal.library.inventory.ports.incoming.AddNewBook;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.AddNewBookCommand;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.incoming.AddNewBook;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/core/InventoryFacade.java

@@ -1,12 +1,12 @@
-package io.wkrzywiec.hexagonal.library.inventory;
+package io.wkrzywiec.hexagonal.library.domain.inventory.core;
 
-import io.wkrzywiec.hexagonal.library.inventory.model.AddNewBookCommand;
-import io.wkrzywiec.hexagonal.library.inventory.model.Book;
-import io.wkrzywiec.hexagonal.library.inventory.model.NewBookWasAddedEvent;
-import io.wkrzywiec.hexagonal.library.inventory.ports.incoming.AddNewBook;
-import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.InventoryEventPublisher;
-import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.GetBookDetails;
-import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.InventoryDatabase;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.AddNewBookCommand;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.Book;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.NewBookWasAddedEvent;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.incoming.AddNewBook;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.outgoing.InventoryEventPublisher;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.outgoing.GetBookDetails;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.outgoing.InventoryDatabase;
 
 
 public class InventoryFacade implements AddNewBook{

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/core/model/AddNewBookCommand.java

@@ -1,8 +1,7 @@
-package io.wkrzywiec.hexagonal.library.inventory.model;
+package io.wkrzywiec.hexagonal.library.domain.inventory.core.model;
 
 import lombok.AllArgsConstructor;
 import lombok.Builder;
-import lombok.Data;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/core/model/Author.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.inventory.model;
+package io.wkrzywiec.hexagonal.library.domain.inventory.core.model;
 
 import lombok.EqualsAndHashCode;
 import lombok.ToString;

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/core/model/Book.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.inventory.model;
+package io.wkrzywiec.hexagonal.library.domain.inventory.core.model;
 
 import lombok.EqualsAndHashCode;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/core/model/BookIdentification.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.inventory.model;
+package io.wkrzywiec.hexagonal.library.domain.inventory.core.model;
 
 import lombok.EqualsAndHashCode;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/core/model/Isbn10.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.inventory.model;
+package io.wkrzywiec.hexagonal.library.domain.inventory.core.model;
 
 import lombok.EqualsAndHashCode;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/core/model/Isbn13.java

@@ -1,7 +1,6 @@
-package io.wkrzywiec.hexagonal.library.inventory.model;
+package io.wkrzywiec.hexagonal.library.domain.inventory.core.model;
 
 import lombok.EqualsAndHashCode;
-import lombok.ToString;
 
 import javax.persistence.Column;
 import javax.persistence.Embeddable;

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/core/model/NewBookWasAddedEvent.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.inventory.model;
+package io.wkrzywiec.hexagonal.library.domain.inventory.core.model;
 
 import java.time.Instant;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/core/ports/incoming/AddNewBook.java

@@ -0,0 +1,7 @@
+package io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.incoming;
+
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.AddNewBookCommand;
+
+public interface AddNewBook {
+    void handle(AddNewBookCommand addNewBookCommand);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/core/ports/outgoing/GetBookDetails.java

@@ -0,0 +1,7 @@
+package io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.outgoing;
+
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.Book;
+
+public interface GetBookDetails {
+    Book handle(String bookId);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/core/ports/outgoing/InventoryDatabase.java

@@ -0,0 +1,7 @@
+package io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.outgoing;
+
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.Book;
+
+public interface InventoryDatabase {
+    Book save(Book book);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/core/ports/outgoing/InventoryEventPublisher.java

@@ -0,0 +1,7 @@
+package io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.outgoing;
+
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.NewBookWasAddedEvent;
+
+public interface InventoryEventPublisher {
+    void publishNewBookWasAddedEvent(NewBookWasAddedEvent event);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/infrastructure/BookRepository.java

@@ -1,6 +1,6 @@
-package io.wkrzywiec.hexagonal.library.inventory.infrastructure;
+package io.wkrzywiec.hexagonal.library.domain.inventory.infrastructure;
 
-import io.wkrzywiec.hexagonal.library.inventory.model.Book;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.Book;
 import org.springframework.data.repository.CrudRepository;
 import org.springframework.stereotype.Repository;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/infrastructure/GoogleBooksAdapter.java

@@ -1,14 +1,14 @@
-package io.wkrzywiec.hexagonal.library.inventory.infrastructure;
+package io.wkrzywiec.hexagonal.library.domain.inventory.infrastructure;
 
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonParser;
-import io.wkrzywiec.hexagonal.library.inventory.model.Author;
-import io.wkrzywiec.hexagonal.library.inventory.model.Book;
-import io.wkrzywiec.hexagonal.library.inventory.model.BookIdentification;
-import io.wkrzywiec.hexagonal.library.inventory.model.Isbn10;
-import io.wkrzywiec.hexagonal.library.inventory.model.Isbn13;
-import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.GetBookDetails;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.Author;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.Book;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.BookIdentification;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.Isbn10;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.Isbn13;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.outgoing.GetBookDetails;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/infrastructure/InventoryDatabaseAdapter.java

@@ -1,7 +1,7 @@
-package io.wkrzywiec.hexagonal.library.inventory.infrastructure;
+package io.wkrzywiec.hexagonal.library.domain.inventory.infrastructure;
 
-import io.wkrzywiec.hexagonal.library.inventory.model.Book;
-import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.InventoryDatabase;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.Book;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.outgoing.InventoryDatabase;
 import lombok.RequiredArgsConstructor;
 
 @RequiredArgsConstructor

src/main/java/io/wkrzywiec/hexagonal/library/domain/inventory/infrastructure/SpringInventoryEventPublisherAdapter.java

@@ -1,7 +1,7 @@
-package io.wkrzywiec.hexagonal.library.inventory.infrastructure;
+package io.wkrzywiec.hexagonal.library.domain.inventory.infrastructure;
 
-import io.wkrzywiec.hexagonal.library.inventory.model.NewBookWasAddedEvent;
-import io.wkrzywiec.hexagonal.library.inventory.ports.outgoing.InventoryEventPublisher;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.model.NewBookWasAddedEvent;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.outgoing.InventoryEventPublisher;
 import lombok.RequiredArgsConstructor;
 import org.springframework.context.ApplicationEventPublisher;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/user/application/UserCommandController.java

@@ -1,7 +1,7 @@
-package io.wkrzywiec.hexagonal.library.user.application;
+package io.wkrzywiec.hexagonal.library.domain.user.application;
 
-import io.wkrzywiec.hexagonal.library.user.model.AddUserCommand;
-import io.wkrzywiec.hexagonal.library.user.ports.incoming.AddNewUser;
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.AddUserCommand;
+import io.wkrzywiec.hexagonal.library.domain.user.core.ports.incoming.AddNewUser;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;

src/main/java/io/wkrzywiec/hexagonal/library/domain/user/core/UserFacade.java

@@ -0,0 +1,25 @@
+package io.wkrzywiec.hexagonal.library.domain.user.core;
+
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.AddUserCommand;
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.EmailAddress;
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.User;
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.UserIdentifier;
+import io.wkrzywiec.hexagonal.library.domain.user.core.ports.incoming.AddNewUser;
+import io.wkrzywiec.hexagonal.library.domain.user.core.ports.outgoing.UserDatabase;
+import lombok.AllArgsConstructor;
+
+@AllArgsConstructor
+public class UserFacade implements AddNewUser {
+
+    private final UserDatabase database;
+
+    @Override
+    public UserIdentifier handle(AddUserCommand addUserCommand) {
+        User user = new User(
+                new EmailAddress(addUserCommand.getEmail()),
+                addUserCommand.getFirstName(),
+                addUserCommand.getLastName()
+        );
+        return database.save(user);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/user/core/model/AddUserCommand.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.user.model;
+package io.wkrzywiec.hexagonal.library.domain.user.core.model;
 
 import lombok.AllArgsConstructor;
 import lombok.Builder;

src/main/java/io/wkrzywiec/hexagonal/library/domain/user/core/model/EmailAddress.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.user.model;
+package io.wkrzywiec.hexagonal.library.domain.user.core.model;
 
 import lombok.EqualsAndHashCode;
 

src/main/java/io/wkrzywiec/hexagonal/library/domain/user/core/model/User.java

@@ -1,6 +1,5 @@
-package io.wkrzywiec.hexagonal.library.user.model;
+package io.wkrzywiec.hexagonal.library.domain.user.core.model;
 
-import lombok.AllArgsConstructor;
 import lombok.EqualsAndHashCode;
 
 import javax.persistence.Column;

src/main/java/io/wkrzywiec/hexagonal/library/domain/user/core/model/UserIdentifier.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library.user.model;
+package io.wkrzywiec.hexagonal.library.domain.user.core.model;
 
 
 public class UserIdentifier {

src/main/java/io/wkrzywiec/hexagonal/library/domain/user/core/ports/incoming/AddNewUser.java

@@ -0,0 +1,8 @@
+package io.wkrzywiec.hexagonal.library.domain.user.core.ports.incoming;
+
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.AddUserCommand;
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.UserIdentifier;
+
+public interface AddNewUser {
+    UserIdentifier handle(AddUserCommand addUserCommand);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/user/core/ports/outgoing/UserDatabase.java

@@ -0,0 +1,8 @@
+package io.wkrzywiec.hexagonal.library.domain.user.core.ports.outgoing;
+
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.User;
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.UserIdentifier;
+
+public interface UserDatabase {
+    UserIdentifier save(User user);
+}

src/main/java/io/wkrzywiec/hexagonal/library/domain/user/infrastructure/UserDatabaseAdapter.java

@@ -1,8 +1,8 @@
-package io.wkrzywiec.hexagonal.library.user.infrastructure;
+package io.wkrzywiec.hexagonal.library.domain.user.infrastructure;
 
-import io.wkrzywiec.hexagonal.library.user.model.User;
-import io.wkrzywiec.hexagonal.library.user.model.UserIdentifier;
-import io.wkrzywiec.hexagonal.library.user.ports.outgoing.UserDatabase;
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.User;
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.UserIdentifier;
+import io.wkrzywiec.hexagonal.library.domain.user.core.ports.outgoing.UserDatabase;
 import lombok.RequiredArgsConstructor;
 
 @RequiredArgsConstructor

src/main/java/io/wkrzywiec/hexagonal/library/domain/user/infrastructure/UserRepository.java

@@ -1,6 +1,6 @@
-package io.wkrzywiec.hexagonal.library.user.infrastructure;
+package io.wkrzywiec.hexagonal.library.domain.user.infrastructure;
 
-import io.wkrzywiec.hexagonal.library.user.model.User;
+import io.wkrzywiec.hexagonal.library.domain.user.core.model.User;
 import org.springframework.data.repository.CrudRepository;
 import org.springframework.stereotype.Repository;
 

src/main/java/io/wkrzywiec/hexagonal/library/email/ports/incoming/SendReservationConfirmation.java

@@ -1,7 +0,0 @@
-package io.wkrzywiec.hexagonal.library.email.ports.incoming;
-
-import io.wkrzywiec.hexagonal.library.email.model.SendReservationConfirmationCommand;
-
-public interface SendReservationConfirmation {
-    void handle(SendReservationConfirmationCommand reservationConfirmationCommand);
-}

src/main/java/io/wkrzywiec/hexagonal/library/email/ports/outgoing/EmailSender.java

@@ -1,8 +0,0 @@
-package io.wkrzywiec.hexagonal.library.email.ports.outgoing;
-
-
-import io.wkrzywiec.hexagonal.library.email.model.ReservationConfirmEmail;
-
-public interface EmailSender {
-    void sendReservationConfirmationEmail(ReservationConfirmEmail reservationConfirmEmail);
-}

src/main/java/io/wkrzywiec/hexagonal/library/infrastructure/BorrowingDomainConfig.java

@@ -0,0 +1,53 @@
+package io.wkrzywiec.hexagonal.library.infrastructure;
+
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.BorrowingFacade;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming.BorrowBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming.CancelOverdueReservations;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming.MakeBookAvailable;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.incoming.ReserveBook;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.outgoing.BorrowingDatabase;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.core.ports.outgoing.BorrowingEventPublisher;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.infrastructure.BorrowingDatabaseAdapter;
+import io.wkrzywiec.hexagonal.library.domain.borrowing.infrastructure.SpringBorrowingEventPublisherAdapter;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Primary;
+import org.springframework.jdbc.core.JdbcTemplate;
+
+public class BorrowingDomainConfig {
+
+    @Bean
+    public BorrowingDatabase borrowingDatabase(JdbcTemplate jdbcTemplate) {
+        return new BorrowingDatabaseAdapter(jdbcTemplate);
+    }
+
+    @Bean
+    public BorrowingEventPublisher borrowingEventPublisher(ApplicationEventPublisher applicationEventPublisher){
+        return new SpringBorrowingEventPublisherAdapter(applicationEventPublisher);
+    }
+
+    @Bean
+    @Qualifier("MakeBookAvailable")
+    public MakeBookAvailable makeBookAvailable(BorrowingDatabase database, BorrowingEventPublisher borrowingEventPublisher) {
+        return new BorrowingFacade(database, borrowingEventPublisher);
+    }
+
+    @Bean
+    @Qualifier("ReserveBook")
+    public ReserveBook reserveBook(BorrowingDatabase database, BorrowingEventPublisher borrowingEventPublisher){
+        return new BorrowingFacade(database, borrowingEventPublisher);
+    }
+
+    @Bean
+    @Qualifier("BorrowBook")
+    public BorrowBook borrowBook(BorrowingDatabase database, BorrowingEventPublisher borrowingEventPublisher){
+        return new BorrowingFacade(database, borrowingEventPublisher);
+    }
+
+    @Bean
+    @Qualifier("CancelOverdueReservations")
+    public CancelOverdueReservations cancelOverdueReservations(BorrowingDatabase database, BorrowingEventPublisher borrowingEventPublisher){
+        return new BorrowingFacade(database, borrowingEventPublisher);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/infrastructure/EmailDomainConfig.java

@@ -0,0 +1,28 @@
+package io.wkrzywiec.hexagonal.library.infrastructure;
+
+import io.wkrzywiec.hexagonal.library.domain.email.core.EmailFacade;
+import io.wkrzywiec.hexagonal.library.domain.email.infrastructure.EmailDatabaseAdapter;
+import io.wkrzywiec.hexagonal.library.domain.email.infrastructure.SendGridEmailSender;
+import io.wkrzywiec.hexagonal.library.domain.email.core.ports.incoming.SendReservationConfirmation;
+import io.wkrzywiec.hexagonal.library.domain.email.core.ports.outgoing.EmailSender;
+import io.wkrzywiec.hexagonal.library.domain.email.core.ports.outgoing.EmailDatabase;
+import org.springframework.context.annotation.Bean;
+import org.springframework.jdbc.core.JdbcTemplate;
+
+public class EmailDomainConfig {
+
+    @Bean
+    public EmailSender emailSender() {
+        return new SendGridEmailSender();
+    }
+
+    @Bean
+    public EmailDatabase libraryDatabase(JdbcTemplate jdbcTemplate){
+        return new EmailDatabaseAdapter(jdbcTemplate);
+    }
+
+    @Bean
+    public SendReservationConfirmation sendReservationConfirmation(EmailSender emailSender, EmailDatabase database){
+        return new EmailFacade(emailSender, database);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/infrastructure/InventoryDomainConfig.java

@@ -1,16 +1,16 @@
-package io.wkrzywiec.hexagonal.library;
+package io.wkrzywiec.hexagonal.library.infrastructure;
 
-import io.wkrzywiec.hexagonal.library.inventory.InventoryFacade;
-import io.wkrzywiec.hexagonal.library.inventory.infrastructure.BookRepository;
-import io.wkrzywiec.hexagonal.library.inventory.infrastructure.GoogleBooksAdapter;
-import io.wkrzywiec.hexagonal.library.inventory.infrastructure.InventoryDatabaseAdapter;
-import io.wkrzywiec.hexagonal.library.inventory.infrastructure.SpringInventoryEventPublisherAdapter;
-import io.wkrzywiec.hexagonal.library.inventory.ports.incoming.AddNewBook;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.InventoryFacade;
+import io.wkrzywiec.hexagonal.library.domain.inventory.infrastructure.BookRepository;
+import io.wkrzywiec.hexagonal.library.domain.inventory.infrastructure.GoogleBooksAdapter;
+import io.wkrzywiec.hexagonal.library.domain.inventory.infrastructure.InventoryDatabaseAdapter;
+import io.wkrzywiec.hexagonal.library.domain.inventory.infrastructure.SpringInventoryEventPublisherAdapter;
+import io.wkrzywiec.hexagonal.library.domain.inventory.core.ports.incoming.AddNewBook;
 import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.context.annotation.Bean;
 import org.springframework.web.client.RestTemplate;
 
-class InventoryDomainConfig {
+public class InventoryDomainConfig {
 
     @Bean
     SpringInventoryEventPublisherAdapter springInventoryEventPublisher(ApplicationEventPublisher applicationEventPublisher) {

src/main/java/io/wkrzywiec/hexagonal/library/infrastructure/LibraryHexagonalConfig.java

@@ -1,4 +1,4 @@
-package io.wkrzywiec.hexagonal.library;
+package io.wkrzywiec.hexagonal.library.infrastructure;
 
 import org.springframework.context.annotation.Bean;
 import org.springframework.web.client.RestTemplate;

src/main/java/io/wkrzywiec/hexagonal/library/infrastructure/UserDomainConfig.java

@@ -0,0 +1,21 @@
+package io.wkrzywiec.hexagonal.library.infrastructure;
+
+import io.wkrzywiec.hexagonal.library.domain.user.core.UserFacade;
+import io.wkrzywiec.hexagonal.library.domain.user.infrastructure.UserDatabaseAdapter;
+import io.wkrzywiec.hexagonal.library.domain.user.infrastructure.UserRepository;
+import io.wkrzywiec.hexagonal.library.domain.user.core.ports.incoming.AddNewUser;
+import io.wkrzywiec.hexagonal.library.domain.user.core.ports.outgoing.UserDatabase;
+import org.springframework.context.annotation.Bean;
+
+public class UserDomainConfig {
+
+    @Bean
+    public UserDatabase userDatabase(UserRepository userRepository){
+        return new UserDatabaseAdapter(userRepository);
+    }
+
+    @Bean
+    public AddNewUser addNewUser(UserDatabase userDatabase){
+        return new UserFacade(userDatabase);
+    }
+}

src/main/java/io/wkrzywiec/hexagonal/library/inventory/ports/incoming/AddNewBook.java

@@ -1,7 +0,0 @@
-package io.wkrzywiec.hexagonal.library.inventory.ports.incoming;
-
-import io.wkrzywiec.hexagonal.library.inventory.model.AddNewBookCommand;
-
-public interface AddNewBook {
-    void handle(AddNewBookCommand addNewBookCommand);
-}

src/main/java/io/wkrzywiec/hexagonal/library/inventory/ports/outgoing/GetBookDetails.java

@@ -1,7 +0,0 @@
-package io.wkrzywiec.hexagonal.library.inventory.ports.outgoing;
-
-import io.wkrzywiec.hexagonal.library.inventory.model.Book;
-
-public interface GetBookDetails {
-    Book handle(String bookId);
-}