modified AutoloadBuilder to atomic write operation

tests/util/AutoloadBuilderTest.php

@@ -77,6 +77,7 @@ class AutoloadBuilderTest extends PHPUnit_Framework_TestCase
         $this->setConstants();
         $builder = new AutoloadBuilder(self::$file, array(self::$path . '/' . self::$app . '/src', self::$path . '/' . self::$app . '/cache', self::$path . '/lib'));
 
+        $this->assertFileNotExists(self::$file);
         $builder->build();
 
         $this->assertFileExists(self::$file);
@@ -84,6 +85,8 @@ class AutoloadBuilderTest extends PHPUnit_Framework_TestCase
         $array = require self::$file;
         $this->assertInternalType('array', $array);
         $this->assertNotEmpty($array);
+        $this->assertArrayHasKey('AutoloadBuilder', $array);
+        $this->assertArrayHasKey('Load', $array);
     }
 
     /**
@@ -94,7 +97,10 @@ class AutoloadBuilderTest extends PHPUnit_Framework_TestCase
         $this->setConstants();
 
         $this->setExpectedException('PHPUnit_Framework_Error');
+        $this->assertFileNotExists(self::$file);
 
+        touch(self::$file);
+        $this->assertFileExists(self::$file);
         chmod(self::$file, 0400);
         $builder = new AutoloadBuilder(self::$file, array(self::$path . '/' . self::$app . '/src', self::$path . '/' . self::$app . '/cache', self::$path . '/lib'));
 
@@ -102,15 +108,6 @@ class AutoloadBuilderTest extends PHPUnit_Framework_TestCase
         chmod(self::$file, 0777);
     }
 
-    public function tearDown()
-    {
-//        if (defined('PATH')) {
-//            echo PHP_EOL . __CLASS__ . '   ' . PATH . PHP_EOL;
-//        } else {
-//            echo PHP_EOL . __CLASS__ . '   ' . 'PATH NOT DEFINED' . PHP_EOL;
-//        }
-    }
-
     public static function tearDownAfterClass()
     {
         if (file_exists(self::$file)) {

util/AutoloadBuilder.php

@@ -35,7 +35,7 @@ class AutoloadBuilder
 
     public function build()
     {
-        $this->openAutoload();
+        $array_string = "<?php\n// This file is autogenerated by \n// " . __FILE__ . " script.\nreturn array(\n";
         // for dublicates check
         $classes = array();
         foreach ($this->dirs as $dir) {
@@ -65,47 +65,39 @@ class AutoloadBuilder
                         if (array_key_exists($match[2], $classes)) {
                             continue;
                         }
-                        $string = "'{$match[2]}'=>'" . $relative_path . "',\n";
-                        $this->write($string);
+                        $array_string .= "'{$match[2]}'=>'" . $relative_path . "',\n";
                         $classes[$match[2]] = $file->getRealPath();
                     }
                 }
             }
         }
-        $this->closeAutoload();
+        $array_string .= ');';
+        $this->writeAutoload($array_string);
+        $this->isFileConsistent();
     }
 
-    protected function isExcluded($file)
-    {
-        foreach ($this->exclude as $dir) {
-            if (stripos($file, PATH . $dir) === 0) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-
-    protected function openAutoload()
+    protected function writeAutoload($string)
     {
-        $this->write("<?php\n// This file is autogenerated by \n// " . __FILE__ . " script.\nreturn array(\n");
+        file_put_contents($this->autoload, $string);
     }
 
-    protected function closeAutoload()
+    protected function isFileConsistent()
     {
-        if ($this->write(');')) {
-            fclose($this->handler);
+        $autoload_array = include($this->autoload);
+        if(!is_array($autoload_array)) {
+            unlink($this->autoload);
+            trigger_error("Error while generating autoload file.", E_USER_ERROR);
         }
     }
 
-    protected function write($string)
+    protected function isExcluded($file)
     {
-        if (!$this->handler) {
-            if (!$this->handler = fopen($this->autoload, 'w')) {
-                trigger_error("{$this->autoload} is not writable", E_USER_ERROR);
+        foreach ($this->exclude as $dir) {
+            if (stripos($file, PATH . $dir) === 0) {
+                return true;
             }
         }
-        return (bool) fwrite($this->handler, $string);
+        return false;
     }
 
     protected function rightSubstr($string, $nchars)