refactor: improved structure of connection core

src/main/libs/ClientsFactory.js

@@ -0,0 +1,27 @@
+'use strict';
+import { MySQLClient } from './clients/MySQLClient';
+
+export class ClientsFactory {
+   /**
+    * Returns a database connection based on received args.
+    *
+    * @param {Object} args
+    * @param {String} args.client
+    * @param {Object} args.params
+    * @param {String} args.params.host
+    * @param {Number} args.params.port
+    * @param {String} args.params.password
+    * @param {Number=} args.poolSize
+    * @returns Database Connection
+    * @memberof ClientsFactory
+    */
+   static getConnection (args) {
+      switch (args.client) {
+         case 'mysql':
+         case 'maria':
+            return new MySQLClient(args);
+         default:
+            return new Error(`Unknown database client: ${args.client}`);
+      }
+   }
+}