Add ability to change cache path in FilesystemCachePool (#72)

* Add ability to change cache path in FilesystemCachePool

Author: Anahkiasen

FilesystemCachePool.php

@@ -25,22 +25,38 @@
  */
 class FilesystemCachePool extends AbstractCachePool implements TaggablePoolInterface
 {
-    const CACHE_PATH = 'cache';
-
     use TaggablePoolTrait;
 
     /**
      * @type Filesystem
      */
     private $filesystem;
 
+    /**
+     * The folder should not begin nor end with a slash. Example: path/to/cache.
+     *
+     * @type string
+     */
+    private $folder;
+
     /**
      * @param Filesystem $filesystem
+     * @param string     $folder
      */
-    public function __construct(Filesystem $filesystem)
+    public function __construct(Filesystem $filesystem, $folder = 'cache')
     {
+        $this->folder = $folder;
+
         $this->filesystem = $filesystem;
-        $this->filesystem->createDir(self::CACHE_PATH);
+        $this->filesystem->createDir($this->folder);
+    }
+
+    /**
+     * @param string $folder
+     */
+    public function setFolder($folder)
+    {
+        $this->folder = $folder;
     }
 
     /**
@@ -71,8 +87,8 @@ protected function fetchObjectFromCache($key)
      */
     protected function clearAllObjectsFromCache()
     {
-        $this->filesystem->deleteDir(self::CACHE_PATH);
-        $this->filesystem->createDir(self::CACHE_PATH);
+        $this->filesystem->deleteDir($this->folder);
+        $this->filesystem->createDir($this->folder);
 
         return true;
     }
@@ -122,7 +138,7 @@ private function getFilePath($key)
             throw new InvalidArgumentException(sprintf('Invalid key "%s". Valid keys must match [a-zA-Z0-9_\.! ].', $key));
         }
 
-        return sprintf('%s/%s', self::CACHE_PATH, $key);
+        return sprintf('%s/%s', $this->folder, $key);
     }
 
     /**

README.md

@@ -31,6 +31,13 @@ $filesystem        = new Filesystem($filesystemAdapter);
 $pool = new FilesystemCachePool($filesystem);
 ```
 
+You can change the folder the cache pool will write to through the `setFolder` setter:
+
+```php
+$pool = new FilesystemCachePool($filesystem);
+$pool->setFolder('path/to/cache');
+```
+
 ### Contribute
 
 Contributions are very welcome! Send a pull request to the [main repository](https://github.com/php-cache/cache) or 

Tests/FilesystemCachePoolTest.php

@@ -44,4 +44,13 @@ public function testCleanupOnExpire()
         $this->assertFalse($item->isHit());
         $this->assertFalse($this->getFilesystem()->has('cache/test_ttl_null'));
     }
+
+    public function testChangeFolder()
+    {
+        $pool = $this->createCachePool();
+        $pool->setFolder('foobar');
+
+        $pool->save($pool->getItem('test_path'));
+        $this->assertTrue($this->getFilesystem()->has('foobar/test_path'));
+    }
 }