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lib/pkp/classes/cache/APCCache.php

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+<?php
+
+/**
+ * @file classes/cache/APCCache.php
+ *
+ * Copyright (c) 2014-2021 Simon Fraser University
+ * Copyright (c) 2000-2021 John Willinsky
+ * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
+ *
+ * @class apc_false
+ *
+ * @ingroup cache
+ *
+ * @see GenericCache
+ *
+ * @brief Provides caching based on APC's variable store.
+ */
+
+namespace PKP\cache;
+
+class apc_false
+{
+};
+
+class APCCache extends GenericCache
+{
+    /**
+     * Flush the cache.
+     */
+    public function flush()
+    {
+        $prefix = INDEX_FILE_LOCATION . ':' . $this->getContext() . ':' . $this->getCacheId();
+        $info = apc_cache_info('user');
+        foreach ($info['cache_list'] as $entry) {
+            if (substr($entry['info'], 0, strlen($prefix)) == $prefix) {
+                apc_delete($entry['info']);
+            }
+        }
+    }
+
+    /**
+     * Get an object from the cache.
+     *
+     */
+    public function getCache($id)
+    {
+        $key = INDEX_FILE_LOCATION . ':' . $this->getContext() . ':' . $this->getCacheId() . ':' . $id;
+        $returner = unserialize(apc_fetch($key));
+        if ($returner === false) {
+            return $this->cacheMiss;
+        }
+        if ($returner instanceof apc_false) {
+            $returner = false;
+        }
+        return $returner;
+    }
+
+    /**
+     * Set an object in the cache. This function should be overridden
+     * by subclasses.
+     *
+     */
+    public function setCache($id, $value)
+    {
+        $key = INDEX_FILE_LOCATION . ':' . $this->getContext() . ':' . $this->getCacheId() . ':' . $id;
+        if ($value === false) {
+            $value = new apc_false();
+        }
+        apc_store($key, serialize($value));
+    }
+
+    /**
+     * Get the time at which the data was cached.
+     * Not implemented in this type of cache.
+     */
+    public function getCacheTime()
+    {
+        return null;
+    }
+
+    /**
+     * Set the entire contents of the cache.
+     * WARNING: THIS DOES NOT FLUSH THE CACHE FIRST!
+     *
+     * @param array $contents Complete cache contents.
+     */
+    public function setEntireCache($contents)
+    {
+        foreach ($contents as $id => $value) {
+            $this->setCache($id, $value);
+        }
+    }
+}