Hexagonal pattern: Improve connection properties handling

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

@@ -28,6 +28,7 @@ import com.iluwatar.hexagonal.domain.LotteryAdministration;
 import com.iluwatar.hexagonal.domain.LotteryNumbers;
 import com.iluwatar.hexagonal.domain.LotteryService;
 import com.iluwatar.hexagonal.module.LotteryModule;
+import com.iluwatar.hexagonal.mongo.MongoConnectionPropertiesLoader;
 import com.iluwatar.hexagonal.sampledata.SampleData;
 
 import java.util.Scanner;
@@ -41,6 +42,7 @@ public class ConsoleAdministration {
    * Program entry point
    */
   public static void main(String[] args) {
+    MongoConnectionPropertiesLoader.load();
     Injector injector = Guice.createInjector(new LotteryModule());
     LotteryAdministration administartion = injector.getInstance(LotteryAdministration.class);
     LotteryService service = injector.getInstance(LotteryService.class);

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

@@ -22,7 +22,6 @@
  */
 package com.iluwatar.hexagonal.banking;
 
-import com.iluwatar.hexagonal.mongo.MongoConnectionProperties;
 import com.mongodb.MongoClient;
 import com.mongodb.client.MongoCollection;
 import com.mongodb.client.MongoDatabase;
@@ -71,8 +70,8 @@ public class MongoBank implements WireTransfers {
     if (mongoClient != null) {
       mongoClient.close();
     }
-    MongoConnectionProperties properties = new MongoConnectionProperties().load();
-    mongoClient = new MongoClient(properties.getHost(), properties.getPort());
+    mongoClient = new MongoClient(System.getProperty("mongo-host"),
+        Integer.parseInt(System.getProperty("mongo-port")));
     database = mongoClient.getDatabase(dbName);
     accountsCollection = database.getCollection(accountsCollectionName);
   }

hexagonal/src/main/java/com/iluwatar/hexagonal/database/MongoTicketRepository.java

@@ -26,7 +26,6 @@ import com.iluwatar.hexagonal.domain.LotteryNumbers;
 import com.iluwatar.hexagonal.domain.LotteryTicket;
 import com.iluwatar.hexagonal.domain.LotteryTicketId;
 import com.iluwatar.hexagonal.domain.PlayerDetails;
-import com.iluwatar.hexagonal.mongo.MongoConnectionProperties;
 import com.mongodb.MongoClient;
 import com.mongodb.client.MongoCollection;
 import com.mongodb.client.MongoDatabase;
@@ -83,8 +82,8 @@ public class MongoTicketRepository implements LotteryTicketRepository {
     if (mongoClient != null) {
       mongoClient.close();
     }
-    MongoConnectionProperties properties = new MongoConnectionProperties().load();
-    mongoClient = new MongoClient(properties.getHost(), properties.getPort());
+    mongoClient = new MongoClient(System.getProperty("mongo-host"),
+        Integer.parseInt(System.getProperty("mongo-port")));
     database = mongoClient.getDatabase(dbName);
     ticketsCollection = database.getCollection(ticketsCollectionName);
     countersCollection = database.getCollection(countersCollectionName);

hexagonal/src/main/java/com/iluwatar/hexagonal/mongo/MongoConnectionPropertiesLoader.java

@@ -26,55 +26,33 @@ import java.io.FileInputStream;
 import java.util.Properties;
 
 /**
- * Mongo connection properties
+ * Mongo connection properties loader
  */
-public class MongoConnectionProperties {
+public class MongoConnectionPropertiesLoader {
 
   private static final String DEFAULT_HOST = "localhost";
   private static final int DEFAULT_PORT = 27017;
 
-  private String host;
-  private int port;
-
-  /**
-   * Constructor
-   */
-  public MongoConnectionProperties() {
-    this.host = DEFAULT_HOST;
-    this.port = DEFAULT_PORT;
-  }
-
-  /**
-   * @return host name
-   */
-  public String getHost() {
-    return host;
-  }
-
-  /**
-   * @return port number
-   */
-  public int getPort() {
-    return port;
-  }
-
   /**
    * Try to load connection properties from file.
    * Fall back to default connection properties.
    */
-  public MongoConnectionProperties load() {
+  public static void load() {
+    String host = DEFAULT_HOST;
+    int port = DEFAULT_PORT;
     String path = System.getProperty("hexagonal.properties.path");
     Properties properties = new Properties();
     if (path != null) {
       try (FileInputStream fin = new FileInputStream(path)) {
         properties.load(fin);
-        this.host = properties.getProperty("host");
-        this.port = Integer.parseInt(properties.getProperty("port"));
+        host = properties.getProperty("mongo-host");
+        port = Integer.parseInt(properties.getProperty("mongo-port"));
       } catch (Exception e) {
         // error occurred, use default properties
         e.printStackTrace();
       }
     }
-    return this;
+    System.setProperty("mongo-host", host);
+    System.setProperty("mongo-port", String.format("%d", port));
   }
 }

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

@@ -32,6 +32,7 @@ import com.iluwatar.hexagonal.domain.LotteryTicketCheckResult;
 import com.iluwatar.hexagonal.domain.LotteryTicketId;
 import com.iluwatar.hexagonal.domain.PlayerDetails;
 import com.iluwatar.hexagonal.module.LotteryModule;
+import com.iluwatar.hexagonal.mongo.MongoConnectionPropertiesLoader;
 
 import java.util.HashSet;
 import java.util.Optional;
@@ -48,6 +49,7 @@ public class ConsoleLottery {
    * Program entry point
    */
   public static void main(String[] args) {
+    MongoConnectionPropertiesLoader.load();
     Injector injector = Guice.createInjector(new LotteryModule());
     LotteryService service = injector.getInstance(LotteryService.class);
     WireTransfers bank = injector.getInstance(WireTransfers.class);

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

@@ -22,7 +22,7 @@
  */
 package com.iluwatar.hexagonal.banking;
 
-import com.iluwatar.hexagonal.mongo.MongoConnectionProperties;
+import com.iluwatar.hexagonal.mongo.MongoConnectionPropertiesLoader;
 import com.mongodb.MongoClient;
 import org.junit.Before;
 import org.junit.Ignore;
@@ -43,8 +43,9 @@ public class MongoBankTest {
 
   @Before
   public void init() {
-    MongoConnectionProperties properties = new MongoConnectionProperties().load();
-    MongoClient mongoClient = new MongoClient(properties.getHost(), properties.getPort());
+    MongoConnectionPropertiesLoader.load();
+    MongoClient mongoClient = new MongoClient(System.getProperty("mongo-host"),
+        Integer.parseInt(System.getProperty("mongo-port")));
     mongoClient.dropDatabase(TEST_DB);
     mongoClient.close();
     mongoBank = new MongoBank(TEST_DB, TEST_ACCOUNTS_COLLECTION);

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

@@ -26,7 +26,7 @@ import com.iluwatar.hexagonal.domain.LotteryNumbers;
 import com.iluwatar.hexagonal.domain.LotteryTicket;
 import com.iluwatar.hexagonal.domain.LotteryTicketId;
 import com.iluwatar.hexagonal.domain.PlayerDetails;
-import com.iluwatar.hexagonal.mongo.MongoConnectionProperties;
+import com.iluwatar.hexagonal.mongo.MongoConnectionPropertiesLoader;
 import com.mongodb.MongoClient;
 import org.junit.Before;
 import org.junit.Ignore;
@@ -51,8 +51,9 @@ public class MongoTicketRepositoryTest {
 
   @Before
   public void init() {
-    MongoConnectionProperties properties = new MongoConnectionProperties().load();
-    MongoClient mongoClient = new MongoClient(properties.getHost(), properties.getPort());
+    MongoConnectionPropertiesLoader.load();
+    MongoClient mongoClient = new MongoClient(System.getProperty("mongo-host"),
+        Integer.parseInt(System.getProperty("mongo-port")));
     mongoClient.dropDatabase(TEST_DB);
     mongoClient.close();
     repository = new MongoTicketRepository(TEST_DB, TEST_TICKETS_COLLECTION,