+ Cache/APC.php and test

min/lib/Minify/Cache/APC.php

@@ -0,0 +1,130 @@
+<?php
+/**
+ * Class Minify_Cache_APC
+ * @package Minify
+ */
+
+/**
+ * APC-based cache class for Minify
+ * 
+ * <code>
+ * Minify::setCache(new Minify_Cache_APC());
+ * </code>
+ * 
+ * @package Minify
+ * @author Chris Edwards
+ **/
+class Minify_Cache_APC {
+
+    /**
+     * Create a Minify_Cache_APC object, to be passed to
+     * Minify::setCache().
+     *
+     *
+     * @param int $expire seconds until expiration (default = 0
+     * meaning the item will not get an expiration date)
+     *
+     * @return null
+     */
+    public function __construct($expire = 0)
+    {
+        $this->_exp = $expire;
+    }
+
+    /**
+     * Write data to cache.
+     *
+     * @param string $id cache id
+     *
+     * @param string $data
+     *
+     * @return bool success
+     */
+    public function store($id, $data)
+    {
+        return apc_store($id, "{$_SERVER['REQUEST_TIME']}|{$data}", $this->_exp);
+    }
+
+    /**
+     * Get the size of a cache entry
+     *
+     * @param string $id cache id
+     *
+     * @return int size in bytes
+     */
+    public function getSize($id)
+    {
+        return $this->_fetch($id)
+            ? strlen($this->_data)
+            : false;
+    }
+
+    /**
+     * Does a valid cache entry exist?
+     *
+     * @param string $id cache id
+     *
+     * @param int $srcMtime mtime of the original source file(s)
+     *
+     * @return bool exists
+     */
+    public function isValid($id, $srcMtime)
+    {
+        return ($this->_fetch($id) && ($this->_lm >= $srcMtime));
+    }
+
+    /**
+     * Send the cached content to output
+     *
+     * @param string $id cache id
+     */
+    public function display($id)
+    {
+        echo $this->_fetch($id)
+            ? $this->_data
+            : '';
+    }
+
+    /**
+     * Fetch the cached content
+     *
+     * @param string $id cache id
+     *
+     * @return string
+     */
+    public function fetch($id)
+    {
+        return $this->_fetch($id)
+            ? $this->_data
+            : '';
+    }
+
+    private $_exp = null;
+
+    // cache of most recently fetched id
+    private $_lm = null;
+    private $_data = null;
+    private $_id = null;
+
+    /**
+     * Fetch data and timestamp from apc, store in instance
+     *
+     * @param string $id
+     *
+     * @return bool success
+     */
+    private function _fetch($id)
+    {
+        if ($this->_id === $id) {
+            return true;
+        }
+        $ret = apc_fetch($id);
+        if (false === $ret) {
+            $this->_id = null;
+            return false;
+        }
+        list($this->_lm, $this->_data) = explode('|', $ret, 2);
+        $this->_id = $id;
+        return true;
+    }
+}

min_unit_tests/test_Minify_Cache_APC.php

@@ -0,0 +1,33 @@
+<?php
+require_once '_inc.php';
+
+require_once 'Minify/Cache/APC.php';
+
+function test_Minify_Cache_APC()
+{
+    $prefix = 'Minify_Cache_APC : ';
+    if (! function_exists('apc_store')) {
+        return;
+    }
+    $data = str_repeat(md5('testing'), 160);
+    $id = 'Minify_test_cache';
+    
+    $cache = new Minify_Cache_APC();
+    
+    assertTrue(true === $cache->store($id, $data), $prefix . 'store');
+    
+    assertTrue(strlen($data) === $cache->getSize($id), $prefix . 'getSize');
+    
+    assertTrue(true === $cache->isValid($id, $_SERVER['REQUEST_TIME'] - 10), $prefix . 'isValid');
+    
+    ob_start();
+    $cache->display($id);
+    $displayed = ob_get_contents();
+    ob_end_clean();
+    
+    assertTrue($data === $displayed, $prefix . 'display');
+    
+    assertTrue($data === $cache->fetch($id), $prefix . 'fetch');
+}
+
+test_Minify_Cache_APC();