MDL-58859 mlbackend_php: Added to core

Part of MDL-57791 epic.
2017-07-24 07:51:54 +02:00
parent 229ae617c5
commit 9e84757bf0
129 changed files with 11485 additions and 0 deletions
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Phpml;
+
+use Phpml\Exception\SerializeException;
+use Phpml\Exception\FileException;
+
+class ModelManager
+{
+    /**
+     * @param Estimator $estimator
+     * @param string $filepath
+     * @throws FileException
+     * @throws SerializeException
+     */
+    public function saveToFile(Estimator $estimator, string $filepath)
+    {
+        if (!is_writable(dirname($filepath))) {
+            throw FileException::cantSaveFile(basename($filepath));
+        }
+
+        $serialized = serialize($estimator);
+        if (empty($serialized)) {
+            throw SerializeException::cantSerialize(get_type($estimator));
+        }
+
+        $result = file_put_contents($filepath, $serialized, LOCK_EX);
+        if ($result === false) {
+            throw FileException::cantSaveFile(basename($filepath));
+        }
+    }
+
+    /**
+     * @param string $filepath
+     * @return Estimator
+     * @throws FileException
+     * @throws SerializeException
+     */
+    public function restoreFromFile(string $filepath) : Estimator
+    {
+        if (!file_exists($filepath) || !is_readable($filepath)) {
+            throw FileException::cantOpenFile(basename($filepath));
+        }
+
+        $object = unserialize(file_get_contents($filepath));
+        if ($object === false) {
+            throw SerializeException::cantUnserialize(basename($filepath));
+        }
+
+        return $object;
+    }
+}