Hexagonal pattern: Use Guice dependency injection

hexagonal/src/main/java/com/iluwatar/hexagonal/App.java

@@ -26,15 +26,15 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Random;
 
+import com.google.inject.Guice;
+import com.google.inject.Injector;
 import com.iluwatar.hexagonal.administration.LotteryAdministration;
-import com.iluwatar.hexagonal.administration.LotteryAdministrationImpl;
 import com.iluwatar.hexagonal.banking.WireTransfersImpl;
 import com.iluwatar.hexagonal.domain.LotteryConstants;
 import com.iluwatar.hexagonal.domain.LotteryNumbers;
 import com.iluwatar.hexagonal.domain.LotteryTicket;
 import com.iluwatar.hexagonal.domain.PlayerDetails;
 import com.iluwatar.hexagonal.service.LotteryService;
-import com.iluwatar.hexagonal.service.LotteryServiceImpl;
 
 /**
  * 
@@ -124,12 +124,15 @@ public class App {
    * Program entry point
    */
   public static void main(String[] args) {
+
+    Injector injector = Guice.createInjector(new LotteryModule());
+
     // start new lottery round
-    LotteryAdministration administartion = new LotteryAdministrationImpl();
+    LotteryAdministration administartion = injector.getInstance(LotteryAdministration.class);
     administartion.resetLottery();
     
     // submit some lottery tickets
-    LotteryServiceImpl service = new LotteryServiceImpl();
+    LotteryService service = injector.getInstance(LotteryService.class);
     submitTickets(service, 20);
     
     // perform lottery

hexagonal/src/main/java/com/iluwatar/hexagonal/LotteryModule.java

@@ -0,0 +1,52 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 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.hexagonal;
+
+import com.google.inject.AbstractModule;
+import com.iluwatar.hexagonal.administration.LotteryAdministration;
+import com.iluwatar.hexagonal.administration.LotteryAdministrationImpl;
+import com.iluwatar.hexagonal.banking.WireTransfers;
+import com.iluwatar.hexagonal.banking.WireTransfersImpl;
+import com.iluwatar.hexagonal.database.LotteryTicketInMemoryRepository;
+import com.iluwatar.hexagonal.database.LotteryTicketRepository;
+import com.iluwatar.hexagonal.domain.LotterySystem;
+import com.iluwatar.hexagonal.domain.LotterySystemImpl;
+import com.iluwatar.hexagonal.notifications.LotteryNotifications;
+import com.iluwatar.hexagonal.notifications.LotteryNotificationsImpl;
+import com.iluwatar.hexagonal.service.LotteryService;
+import com.iluwatar.hexagonal.service.LotteryServiceImpl;
+
+/**
+ * Guice module for binding production dependencies
+ */
+public class LotteryModule extends AbstractModule {
+  @Override
+  protected void configure() {
+    bind(LotteryTicketRepository.class).to(LotteryTicketInMemoryRepository.class);
+    bind(LotterySystem.class).to(LotterySystemImpl.class);
+    bind(LotteryNotifications.class).to(LotteryNotificationsImpl.class);
+    bind(WireTransfers.class).to(WireTransfersImpl.class);
+    bind(LotteryAdministration.class).to(LotteryAdministrationImpl.class);
+    bind(LotteryService.class).to(LotteryServiceImpl.class);
+  }
+}

hexagonal/src/main/java/com/iluwatar/hexagonal/administration/LotteryAdministrationImpl.java

@@ -22,9 +22,9 @@
  */
 package com.iluwatar.hexagonal.administration;
 
+import com.google.inject.Inject;
 import com.iluwatar.hexagonal.domain.LotteryNumbers;
 import com.iluwatar.hexagonal.domain.LotterySystem;
-import com.iluwatar.hexagonal.domain.LotterySystemImpl;
 import com.iluwatar.hexagonal.domain.LotteryTicket;
 import com.iluwatar.hexagonal.domain.LotteryTicketId;
 
@@ -39,8 +39,9 @@ public class LotteryAdministrationImpl implements LotteryAdministration {
 
   private final LotterySystem lotterySystem;
 
-  public LotteryAdministrationImpl() {
+  @Inject
-    lotterySystem = new LotterySystemImpl();
+  public LotteryAdministrationImpl(LotterySystem lotterySystem) {
+    this.lotterySystem = lotterySystem;
   }
   
   @Override

hexagonal/src/main/java/com/iluwatar/hexagonal/domain/LotterySystemImpl.java

@@ -22,12 +22,10 @@
  */
 package com.iluwatar.hexagonal.domain;
 
+import com.google.inject.Inject;
 import com.iluwatar.hexagonal.banking.WireTransfers;
-import com.iluwatar.hexagonal.banking.WireTransfersImpl;
-import com.iluwatar.hexagonal.database.LotteryTicketInMemoryRepository;
 import com.iluwatar.hexagonal.database.LotteryTicketRepository;
 import com.iluwatar.hexagonal.notifications.LotteryNotifications;
-import com.iluwatar.hexagonal.notifications.LotteryNotificationsImpl;
 
 import java.util.Map;
 import java.util.Optional;
@@ -38,11 +36,18 @@ import java.util.Optional;
 public class LotterySystemImpl implements LotterySystem {
 
   private final LotteryTicketRepository repository;
-  private final LotteryNotifications notifications = new LotteryNotificationsImpl();
+  private final LotteryNotifications notifications;
-  private final WireTransfers bank = new WireTransfersImpl();
+  private final WireTransfers wireTransfers;
 
-  public LotterySystemImpl() {
+  /**
-    repository = new LotteryTicketInMemoryRepository();
+   * Constructor
+   */
+  @Inject
+  public LotterySystemImpl(LotteryTicketRepository repository, LotteryNotifications notifications,
+                           WireTransfers wireTransfers) {
+    this.repository = repository;
+    this.notifications = notifications;
+    this.wireTransfers = wireTransfers;
   }
 
   @Override
@@ -57,8 +62,8 @@ public class LotterySystemImpl implements LotterySystem {
     for (LotteryTicketId id : tickets.keySet()) {
       LotteryTicketCheckResult result = checkTicketForPrize(id, numbers);
       if (result.getResult().equals(LotteryTicketCheckResult.CheckResult.WIN_PRIZE)) {
-        boolean transferred = bank.transferFunds(LotteryConstants.PRIZE_AMOUNT, LotteryConstants.SERVICE_BANK_ACCOUNT,
+        boolean transferred = wireTransfers.transferFunds(LotteryConstants.PRIZE_AMOUNT,
-            tickets.get(id).getPlayerDetails().getBankAccount());
+            LotteryConstants.SERVICE_BANK_ACCOUNT, tickets.get(id).getPlayerDetails().getBankAccount());
         if (transferred) {
           notifications.notifyPrize(tickets.get(id).getPlayerDetails(), LotteryConstants.PRIZE_AMOUNT);
         } else {
@@ -78,8 +83,8 @@ public class LotterySystemImpl implements LotterySystem {
 
   @Override
   public Optional<LotteryTicketId> submitTicket(LotteryTicket ticket) {
-    boolean result = bank.transferFunds(LotteryConstants.TICKET_PRIZE, ticket.getPlayerDetails().getBankAccount(),
+    boolean result = wireTransfers.transferFunds(LotteryConstants.TICKET_PRIZE,
-        LotteryConstants.SERVICE_BANK_ACCOUNT);
+        ticket.getPlayerDetails().getBankAccount(), LotteryConstants.SERVICE_BANK_ACCOUNT);
     if (result == false) {
       notifications.notifyTicketSubmitError(ticket.getPlayerDetails());
       return Optional.empty();

hexagonal/src/main/java/com/iluwatar/hexagonal/service/LotteryServiceImpl.java

@@ -22,9 +22,9 @@
  */
 package com.iluwatar.hexagonal.service;
 
+import com.google.inject.Inject;
 import com.iluwatar.hexagonal.domain.LotteryNumbers;
 import com.iluwatar.hexagonal.domain.LotterySystem;
-import com.iluwatar.hexagonal.domain.LotterySystemImpl;
 import com.iluwatar.hexagonal.domain.LotteryTicket;
 import com.iluwatar.hexagonal.domain.LotteryTicketCheckResult;
 import com.iluwatar.hexagonal.domain.LotteryTicketId;
@@ -43,8 +43,9 @@ public class LotteryServiceImpl implements LotteryService {
   /**
    * Constructor
    */
-  public LotteryServiceImpl() {
+  @Inject
-    lotterySystem = new LotterySystemImpl();
+  public LotteryServiceImpl(LotterySystem lotterySystem) {
+    this.lotterySystem = lotterySystem;
   }
   
   @Override

hexagonal/src/test/java/com/iluwatar/hexagonal/LotteryTestingModule.java

@@ -0,0 +1,52 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 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.hexagonal;
+
+import com.google.inject.AbstractModule;
+import com.iluwatar.hexagonal.administration.LotteryAdministration;
+import com.iluwatar.hexagonal.administration.LotteryAdministrationImpl;
+import com.iluwatar.hexagonal.banking.WireTransfers;
+import com.iluwatar.hexagonal.banking.WireTransfersImpl;
+import com.iluwatar.hexagonal.database.LotteryTicketInMemoryRepository;
+import com.iluwatar.hexagonal.database.LotteryTicketRepository;
+import com.iluwatar.hexagonal.domain.LotterySystem;
+import com.iluwatar.hexagonal.domain.LotterySystemImpl;
+import com.iluwatar.hexagonal.notifications.LotteryNotifications;
+import com.iluwatar.hexagonal.notifications.LotteryNotificationsImpl;
+import com.iluwatar.hexagonal.service.LotteryService;
+import com.iluwatar.hexagonal.service.LotteryServiceImpl;
+
+/**
+ * Guice module for testing dependencies
+ */
+public class LotteryTestingModule extends AbstractModule {
+  @Override
+  protected void configure() {
+    bind(LotteryTicketRepository.class).to(LotteryTicketInMemoryRepository.class);
+    bind(LotterySystem.class).to(LotterySystemImpl.class);
+    bind(LotteryNotifications.class).to(LotteryNotificationsImpl.class);
+    bind(WireTransfers.class).to(WireTransfersImpl.class);
+    bind(LotteryAdministration.class).to(LotteryAdministrationImpl.class);
+    bind(LotteryService.class).to(LotteryServiceImpl.class);
+  }
+}

hexagonal/src/test/java/com/iluwatar/hexagonal/domain/LotteryTest.java

@@ -30,6 +30,11 @@ import java.util.HashSet;
 import java.util.Map;
 import java.util.Optional;
 
+import com.google.inject.Guice;
+import com.google.inject.Inject;
+import com.google.inject.Injector;
+import com.iluwatar.hexagonal.LotteryModule;
+import com.iluwatar.hexagonal.LotteryTestingModule;
 import com.iluwatar.hexagonal.domain.*;
 import org.junit.Before;
 import org.junit.Test;
@@ -48,11 +53,19 @@ import com.iluwatar.hexagonal.test.LotteryTestUtils;
  */
 public class LotteryTest {
 
-  private final LotterySystem lotterySystem = new LotterySystemImpl();
+  private Injector injector;
-  private final WireTransfers wireTransfers = new WireTransfersImpl();
+  @Inject
+  private LotterySystem lotterySystem;
+  @Inject
+  private WireTransfers wireTransfers;
+
+  public LotteryTest() {
+    this.injector = Guice.createInjector(new LotteryTestingModule());
+  }
 
   @Before
-  public void clear() {
+  public void setup() {
+    injector.injectMembers(this);
     // add funds to the test player's bank account
     wireTransfers.setFunds("123-12312", 100);
   }