include plugin worker in phraseanet core

lib/Alchemy/Phrasea/WorkerManager/Configuration/Config.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Alchemy\Phrasea\WorkerManager\Configuration;
+
+class Config
+{
+    const WORKER_DATABASE_FILE = 'worker.db';
+
+    public static function getPluginDatabaseFile()
+    {
+        $dbDir = realpath(dirname(__FILE__) . "/../") . "/Db" ;
+
+        if (!is_dir($dbDir)) {
+            mkdir($dbDir, 0755, true);
+        }
+
+        $dbFile = $dbDir . '/' . self::WORKER_DATABASE_FILE;
+
+        if (!is_file($dbFile)) {
+            file_put_contents($dbFile, '');
+        }
+
+        return $dbFile;
+    }
+
+    public static function getWorkerSqliteConnection()
+    {
+        $db_conn = 'sqlite:'. self::getPluginDatabaseFile();
+        $pdo = new \PDO($db_conn);
+
+        return $pdo;
+    }
+}