Hexagonal pattern: Added Mongo based banking adapter and bound it in Guice production module

hexagonal/src/main/java/com/iluwatar/hexagonal/banking/MongoBank.java

@@ -0,0 +1,134 @@
+/**
+ * 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.banking;
+
+import com.mongodb.MongoClient;
+import com.mongodb.client.MongoCollection;
+import com.mongodb.client.MongoDatabase;
+import com.mongodb.client.model.UpdateOptions;
+import org.bson.Document;
+
+import java.util.ArrayList;
+
+/**
+ * Mongo based banking adapter
+ */
+public class MongoBank implements WireTransfers {
+
+  private static final String DEFAULT_HOST = "localhost";
+  private static final int DEFAULT_PORT = 27017;
+  private static final String DEFAULT_DB = "lotteryDB";
+  private static final String DEFAULT_ACCOUNTS_COLLECTION = "accounts";
+
+  private MongoClient mongoClient;
+  private MongoDatabase database;
+  private MongoCollection<Document> accountsCollection;
+
+  /**
+   * Constructor
+   */
+  public MongoBank() {
+    connect();
+  }
+
+  /**
+   * Constructor accepting parameters
+   */
+  public MongoBank(String host, int port, String dbName, String accountsCollectionName) {
+    connect(host, port, dbName, accountsCollectionName);
+  }
+
+  /**
+   * Connect to database with default parameters
+   */
+  public void connect() {
+    connect(DEFAULT_HOST, DEFAULT_PORT, DEFAULT_DB, DEFAULT_ACCOUNTS_COLLECTION);
+  }
+
+  /**
+   * Connect to database with given parameters
+   */
+  public void connect(String host, int port, String dbName, String accountsCollectionName) {
+    if (mongoClient != null) {
+      mongoClient.close();
+    }
+    mongoClient = new MongoClient(host , port);
+    database = mongoClient.getDatabase(dbName);
+    accountsCollection = database.getCollection(accountsCollectionName);
+  }
+
+  /**
+   * @return mongo client
+   */
+  public MongoClient getMongoClient() {
+    return mongoClient;
+  }
+
+  /**
+   *
+   * @return mongo database
+   */
+  public MongoDatabase getMongoDatabase() {
+    return database;
+  }
+
+  /**
+   *
+   * @return accounts collection
+   */
+  public MongoCollection<Document> getAccountsCollection() {
+    return accountsCollection;
+  }
+
+
+  @Override
+  public void setFunds(String bankAccount, int amount) {
+    Document search = new Document("_id", bankAccount);
+    Document update = new Document("_id", bankAccount).append("funds", amount);
+    accountsCollection.updateOne(search, new Document("$set", update), new UpdateOptions().upsert(true));
+  }
+
+  @Override
+  public int getFunds(String bankAccount) {
+    Document search = new Document("_id", bankAccount);
+    ArrayList<Document> results = accountsCollection.find(search).limit(1).into(new ArrayList<Document>());
+    if (results.size() > 0) {
+      return results.get(0).getInteger("funds");
+    } else {
+      return 0;
+    }
+  }
+
+  @Override
+  public boolean transferFunds(int amount, String sourceBackAccount, String destinationBankAccount) {
+    int sourceFunds = getFunds(sourceBackAccount);
+    if (sourceFunds < amount) {
+      return false;
+    } else {
+      int destFunds = getFunds(destinationBankAccount);
+      setFunds(sourceBackAccount, sourceFunds - amount);
+      setFunds(destinationBankAccount, destFunds + amount);
+      return true;
+    }
+  }
+}

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

@@ -23,7 +23,7 @@
 package com.iluwatar.hexagonal.module;
 
 import com.google.inject.AbstractModule;
-import com.iluwatar.hexagonal.banking.InMemoryBank;
+import com.iluwatar.hexagonal.banking.MongoBank;
 import com.iluwatar.hexagonal.banking.WireTransfers;
 import com.iluwatar.hexagonal.database.LotteryTicketRepository;
 import com.iluwatar.hexagonal.database.MongoTicketRepository;
@@ -38,6 +38,6 @@ public class LotteryModule extends AbstractModule {
   protected void configure() {
     bind(LotteryTicketRepository.class).to(MongoTicketRepository.class);
     bind(LotteryNotifications.class).to(StdOutNotifications.class);
-    bind(WireTransfers.class).to(InMemoryBank.class);
+    bind(WireTransfers.class).to(MongoBank.class);
   }
 }

hexagonal/src/test/java/com/iluwatar/hexagonal/banking/InMemoryBankTest.java

@@ -32,7 +32,7 @@ import org.junit.Test;
  * Tests for banking
  *
  */
-public class WireTransfersTest {
+public class InMemoryBankTest {
 
   private final WireTransfers bank = new InMemoryBank();
   

hexagonal/src/test/java/com/iluwatar/hexagonal/banking/MongoBankTest.java

@@ -0,0 +1,68 @@
+/**
+ * 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.banking;
+
+import com.mongodb.MongoClient;
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Tests for Mongo banking adapter
+ */
+@Ignore
+public class MongoBankTest {
+
+  private static final String TEST_HOST = "localhost";
+  private static final int TEST_PORT = 27017;
+  private static final String TEST_DB = "lotteryDBTest";
+  private static final String TEST_ACCOUNTS_COLLECTION = "testAccounts";
+
+  private MongoBank mongoBank;
+
+  @Before
+  public void init() {
+    MongoClient mongoClient = new MongoClient(TEST_HOST, TEST_PORT);
+    mongoClient.dropDatabase(TEST_DB);
+    mongoClient.close();
+    mongoBank = new MongoBank(TEST_HOST, TEST_PORT, TEST_DB, TEST_ACCOUNTS_COLLECTION);
+  }
+
+  @Test
+  public void testSetup() {
+    assertEquals(0, mongoBank.getAccountsCollection().count());
+  }
+
+  @Test
+  public void testFundTransfers() {
+    assertEquals(0, mongoBank.getFunds("000-000"));
+    mongoBank.setFunds("000-000", 10);
+    assertEquals(10, mongoBank.getFunds("000-000"));
+    assertEquals(0, mongoBank.getFunds("111-111"));
+    mongoBank.transferFunds(9, "000-000", "111-111");
+    assertEquals(1, mongoBank.getFunds("000-000"));
+    assertEquals(9, mongoBank.getFunds("111-111"));
+  }
+}

hexagonal/src/test/java/com/iluwatar/hexagonal/database/MongoTicketRepositoryTest.java

@@ -44,9 +44,9 @@ public class MongoTicketRepositoryTest {
 
   private static final String TEST_HOST = "localhost";
   private static final int TEST_PORT = 27017;
-  private static final String TEST_DB = "lotteryDB";
-  private static final String TEST_TICKETS_COLLECTION = "lotteryTickets";
-  private static final String TEST_COUNTERS_COLLECTION = "counters";
+  private static final String TEST_DB = "lotteryTestDB";
+  private static final String TEST_TICKETS_COLLECTION = "lotteryTestTickets";
+  private static final String TEST_COUNTERS_COLLECTION = "testCounters";
 
   private MongoTicketRepository repository;