文件缓存

Symfony cache 在对象初始化的时候会调用 init 方法，用于区分处理不同适配器之间的差异。

在文件缓存初始化过程中，会初始化缓存存放的路径。可以通过配置文件中的 params 选项进行配置。如:

  1. <?php
  3. return [
  4.     'default' => [
  5.         'adapter' => \Symfony\Component\Cache\Adapter\FilesystemAdapter::class,
  6.         'params' => [
  7.             'directory' => '/tmp',
  8.         ],
  9.     ],
  10. ];

初始化代码:

  1. <?php
  3. namespace Symfony\Component\Cache\Adapter;
  5. use Symfony\Component\Cache\Exception\InvalidArgumentException;
  7. trait FilesystemAdapterTrait
  8. {
  9.     private $directory;
  11.     private function init($namespace, $directory)
  12.     {
  13.         if (!isset($directory[0])) {
  14.             $directory = sys_get_temp_dir().'/symfony-cache';
  15.         } else {
  16.             $directory = realpath($directory) ?: $directory;
  17.         }
  18.         if (isset($namespace[0])) {
  19.             if (preg_match('#[^-+_.A-Za-z0-9]#', $namespace, $match)) {
  20.                 throw new InvalidArgumentException(sprintf('Namespace contains "%s" but only characters in [-+_.A-Za-z0-9] are allowed.', $match[0]));
  21.             }
  22.             $directory .= DIRECTORY_SEPARATOR.$namespace;
  23.         }
  24.         if (!file_exists($directory)) {
  25.             @mkdir($directory, 0777, true);
  26.         }
  27.         $directory .= DIRECTORY_SEPARATOR;
  28.         // On Windows the whole path is limited to 258 chars
  29.         if ('\\' === DIRECTORY_SEPARATOR && strlen($directory) > 234) {
  30.             throw new InvalidArgumentException(sprintf('Cache directory too long (%s)', $directory));
  31.         }
  33.         $this->directory = $directory;
  34.     }
  35.     // ......
  36. }