Create DBManager.java

src/main/java/com/milav/jaguar/database/manager/DBManager.java

@@ -0,0 +1,70 @@
+package com.milav.jaguar.database.errors.manager;
+
+import com.milav.jaguar.database.errors.DBException;
+import com.mongodb.ConnectionString;
+import com.mongodb.MongoClientSettings;
+import com.mongodb.ServerApi;
+import com.mongodb.ServerApiVersion;
+import com.mongodb.client.MongoClient;
+import com.mongodb.client.MongoClients;
+import com.mongodb.client.MongoDatabase;
+import org.apache.logging.log4j.LogManager;
+
+import java.net.UnknownHostException;
+
+/**
+ * Manages the database.
+ *
+ * @author Jigar Shah
+ */
+public class DBManager {
+
+  /** The logger. */
+  private static final org.apache.logging.log4j.Logger LOGGER =
+      LogManager.getLogger(DBManager.class);
+  /** The database. */
+  private static MongoDatabase mongoDB = null;
+  /** The database manager */
+  private static DBManager dbManager = null;
+
+  /**
+   * Initialize the db manager.
+   *
+   * @throws UnknownHostException if we cannot determine the IP address of the host.
+   */
+  private DBManager() throws UnknownHostException {
+    init();
+  }
+
+  /**
+   * Gets the database.
+   *
+   * @return MongoDatabase
+   * @throws DBException since we are dealing with the database.
+   */
+  public static MongoDatabase getMongoDB() throws DBException {
+    if (dbManager == null) {
+      try {
+        dbManager = new DBManager();
+      } catch (UnknownHostException ex) {
+        LOGGER.error(ex);
+        throw new DBException(ex.getMessage(), ex.fillInStackTrace());
+      }
+    }
+    return mongoDB;
+  }
+
+  private void init() {
+
+    ConnectionString connectionString =
+        new ConnectionString(
+            "mongodb+srv://<username>:<password>@<hostname>/jaguar?retryWrites=true&w=majority");
+    MongoClientSettings settings =
+        MongoClientSettings.builder()
+            .applyConnectionString(connectionString)
+            .serverApi(ServerApi.builder().version(ServerApiVersion.V1).build())
+            .build();
+    MongoClient mongoClient = MongoClients.create(settings);
+    mongoDB = mongoClient.getDatabase("jaguar");
+  }
+}