Added connection pool

Author: mmoreram

Diff for: src/Connection.php

@@ -0,0 +1,71 @@
+<?php
+
+/*
+ * This file is part of the DriftPHP Project
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * Feel free to edit as you please, and have fun.
+ *
+ * @author Marc Morera <[email protected]>
+ */
+
+declare(strict_types=1);
+
+namespace Drift\DBAL;
+
+/**
+ * Class ConnectionWorker.
+ */
+class ConnectionWorker
+{
+    private Connection $connection;
+    private int $id;
+    private int $jobs;
+
+    /**
+     * @param Connection $connection
+     * @param int        $id
+     */
+    public function __construct(Connection $connection, int $id)
+    {
+        $this->connection = $connection;
+        $this->id = $id;
+        $this->jobs = 0;
+    }
+
+    public function startJob()
+    {
+        ++$this->jobs;
+    }
+
+    public function stopJob()
+    {
+        --$this->jobs;
+    }
+
+    /**
+     * @return Connection
+     */
+    public function getConnection(): Connection
+    {
+        return $this->connection;
+    }
+
+    /**
+     * @return int
+     */
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    /**
+     * @return int
+     */
+    public function getJobs(): int
+    {
+        return $this->jobs;
+    }
+}

Diff for: src/ConnectionPool.php

@@ -20,35 +20,13 @@
  */
 class Credentials
 {
-    /**
-     * @var string
-     */
-    private $host;
-
-    /**
-     * @var string
-     */
-    private $port;
-
-    /**
-     * @var string
-     */
-    private $user;
-
-    /**
-     * @var string
-     */
-    private $password;
-
-    /**
-     * @var string
-     */
-    private $dbName;
-
-    /**
-     * @var array
-     */
-    private $options;
+    private string $host;
+    private string $port;
+    private string $user;
+    private string $password;
+    private string $dbName;
+    private array $options;
+    private int $connections;
 
     /**
      * Credentials constructor.
@@ -59,21 +37,24 @@ class Credentials
      * @param string $password
      * @param string $dbName
      * @param array  $options
+     * @param int    $connections
      */
     public function __construct(
         string $host,
         string $port,
         string $user,
         string $password,
         string $dbName,
-        array $options = []
+        array $options = [],
+        int $connections = 1
     ) {
         $this->host = $host;
         $this->port = $port;
         $this->user = $user;
         $this->password = $password;
         $this->dbName = $dbName;
         $this->options = $options;
+        $this->connections = $connections;
     }
 
     /**
@@ -124,6 +105,14 @@ public function getOptions(): array
         return $this->options;
     }
 
+    /**
+     * @return int
+     */
+    public function getConnections(): int
+    {
+        return $this->connections;
+    }
+
     /**
      * To string.
      */