added NewMemcachedStorage using memcached extension [Closes #38]

Author: hrach

Diff for: src/Caching/Storages/NewMemcachedStorage.php

@@ -0,0 +1,190 @@
+<?php
+
+/**
+ * This file is part of the Nette Framework (https://nette.org)
+ * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
+ */
+
+namespace Nette\Caching\Storages;
+
+use Nette;
+use Nette\Caching\Cache;
+
+
+/**
+ * Memcached storage using memcached extension.
+ */
+class NewMemcachedStorage extends Nette\Object implements Nette\Caching\IStorage
+{
+	/** @internal cache structure */
+	const META_CALLBACKS = 'callbacks',
+		META_DATA = 'data',
+		META_DELTA = 'delta';
+
+	/** @var \Memcached */
+	private $memcached;
+
+	/** @var string */
+	private $prefix;
+
+	/** @var IJournal */
+	private $journal;
+
+
+	/**
+	 * Checks if Memcached extension is available.
+	 * @return bool
+	 */
+	public static function isAvailable()
+	{
+		return extension_loaded('memcached');
+	}
+
+
+	public function __construct($host = 'localhost', $port = 11211, $prefix = '', IJournal $journal = NULL)
+	{
+		if (!static::isAvailable()) {
+			throw new Nette\NotSupportedException("PHP extension 'memcached' is not loaded.");
+		}
+
+		$this->prefix = $prefix;
+		$this->journal = $journal;
+		$this->memcached = new \Memcached;
+		if ($host) {
+			$this->addServer($host, $port);
+		}
+	}
+
+
+	public function addServer($host = 'localhost', $port = 11211)
+	{
+		if ($this->memcached->addServer($host, $port, 1) === FALSE) {
+			$error = error_get_last();
+			throw new Nette\InvalidStateException("Memcached::addServer(): $error[message].");
+		}
+	}
+
+
+	/**
+	 * @return \Memcached
+	 */
+	public function getConnection()
+	{
+		return $this->memcached;
+	}
+
+
+	/**
+	 * Read from cache.
+	 * @param  string key
+	 * @return mixed|NULL
+	 */
+	public function read($key)
+	{
+		$key = urlencode($this->prefix . $key);
+		$meta = $this->memcached->get($key);
+		if (!$meta) {
+			return NULL;
+		}
+
+		// meta structure:
+		// array(
+		//     data => stored data
+		//     delta => relative (sliding) expiration
+		//     callbacks => array of callbacks (function, args)
+		// )
+
+		// verify dependencies
+		if (!empty($meta[self::META_CALLBACKS]) && !Cache::checkCallbacks($meta[self::META_CALLBACKS])) {
+			$this->memcached->delete($key, 0);
+			return NULL;
+		}
+
+		if (!empty($meta[self::META_DELTA])) {
+			$this->memcached->replace($key, $meta, $meta[self::META_DELTA] + time());
+		}
+
+		return $meta[self::META_DATA];
+	}
+
+
+	/**
+	 * Prevents item reading and writing. Lock is released by write() or remove().
+	 * @param  string key
+	 * @return void
+	 */
+	public function lock($key)
+	{
+	}
+
+
+	/**
+	 * Writes item into the cache.
+	 * @param  string key
+	 * @param  mixed  data
+	 * @param  array  dependencies
+	 * @return void
+	 */
+	public function write($key, $data, array $dp)
+	{
+		if (isset($dp[Cache::ITEMS])) {
+			throw new Nette\NotSupportedException('Dependent items are not supported by MemcachedStorage.');
+		}
+
+		$key = urlencode($this->prefix . $key);
+		$meta = [
+			self::META_DATA => $data,
+		];
+
+		$expire = 0;
+		if (isset($dp[Cache::EXPIRATION])) {
+			$expire = (int) $dp[Cache::EXPIRATION];
+			if (!empty($dp[Cache::SLIDING])) {
+				$meta[self::META_DELTA] = $expire; // sliding time
+			}
+		}
+
+		if (isset($dp[Cache::CALLBACKS])) {
+			$meta[self::META_CALLBACKS] = $dp[Cache::CALLBACKS];
+		}
+
+		if (isset($dp[Cache::TAGS]) || isset($dp[Cache::PRIORITY])) {
+			if (!$this->journal) {
+				throw new Nette\InvalidStateException('CacheJournal has not been provided.');
+			}
+			$this->journal->write($key, $dp);
+		}
+
+		$this->memcached->set($key, $meta, $expire);
+	}
+
+
+	/**
+	 * Removes item from the cache.
+	 * @param  string key
+	 * @return void
+	 */
+	public function remove($key)
+	{
+		$this->memcached->delete(urlencode($this->prefix . $key), 0);
+	}
+
+
+	/**
+	 * Removes items from the cache by conditions & garbage collector.
+	 * @param  array  conditions
+	 * @return void
+	 */
+	public function clean(array $conditions)
+	{
+		if (!empty($conditions[Cache::ALL])) {
+			$this->memcached->flush();
+
+		} elseif ($this->journal) {
+			foreach ($this->journal->clean($conditions) as $entry) {
+				$this->memcached->delete($entry, 0);
+			}
+		}
+	}
+
+}

Diff for: tests/Storages/Memcached.expiration.phpt

@@ -16,8 +16,10 @@ if (!MemcachedStorage::isAvailable()) {
 	Tester\Environment::skip('Requires PHP extension Memcache.');
 }
 
+Tester\Environment::lock('memcached-expiration', TEMP_DIR);
 
-$key = 'nette-expiration-key';
+
+$key = 'nette-memcache-expiration-key';
 $value = 'rulez';
 
 $cache = new Cache(new MemcachedStorage('localhost'));

Diff for: tests/Storages/Memcached.files.phpt

@@ -16,14 +16,16 @@ if (!MemcachedStorage::isAvailable()) {
 	Tester\Environment::skip('Requires PHP extension Memcache.');
 }
 
+Tester\Environment::lock('memcached-files', TEMP_DIR);
 
-$key = 'nette-files-key';
+
+$key = 'nette-memcache-files-key';
 $value = 'rulez';
 
 $cache = new Cache(new MemcachedStorage('localhost'));
 
 
-$dependentFile = TEMP_DIR . '/spec.file';
+$dependentFile = TEMP_DIR . '/spec-memcache.file';
 @unlink($dependentFile);
 
 // Writing cache...

Diff for: tests/Storages/Memcached.priority.phpt

@@ -17,33 +17,35 @@ if (!MemcachedStorage::isAvailable()) {
 	Tester\Environment::skip('Requires PHP extension Memcache.');
 }
 
+Tester\Environment::lock('memcached-priority', TEMP_DIR);
 
-$storage = new MemcachedStorage('localhost', 11211, '', new SQLiteJournal(TEMP_DIR . '/journal.s3db'));
+
+$storage = new MemcachedStorage('localhost', 11211, '', new SQLiteJournal(TEMP_DIR . '/journal-memcache.s3db'));
 $cache = new Cache($storage);
 
 
 // Writing cache...
-$cache->save('nette-priority-key1', 'value1', [
+$cache->save('nette-memcache-priority-key1', 'value1', [
 	Cache::PRIORITY => 100,
 ]);
 
-$cache->save('nette-priority-key2', 'value2', [
+$cache->save('nette-memcache-priority-key2', 'value2', [
 	Cache::PRIORITY => 200,
 ]);
 
-$cache->save('nette-priority-key3', 'value3', [
+$cache->save('nette-memcache-priority-key3', 'value3', [
 	Cache::PRIORITY => 300,
 ]);
 
-$cache->save('nette-priority-key4', 'value4');
+$cache->save('nette-memcache-priority-key4', 'value4');
 
 
 // Cleaning by priority...
 $cache->clean([
 	Cache::PRIORITY => '200',
 ]);
 
-Assert::null($cache->load('nette-priority-key1'));
-Assert::null($cache->load('nette-priority-key2'));
-Assert::truthy($cache->load('nette-priority-key3'));
-Assert::truthy($cache->load('nette-priority-key4'));
+Assert::null($cache->load('nette-memcache-priority-key1'));
+Assert::null($cache->load('nette-memcache-priority-key2'));
+Assert::truthy($cache->load('nette-memcache-priority-key3'));
+Assert::truthy($cache->load('nette-memcache-priority-key4'));

Diff for: tests/Storages/Memcached.sliding.phpt

@@ -16,8 +16,10 @@ if (!MemcachedStorage::isAvailable()) {
 	Tester\Environment::skip('Requires PHP extension Memcache.');
 }
 
+Tester\Environment::lock('memcached-sliding', TEMP_DIR);
 
-$key = 'nette-sliding-key';
+
+$key = 'nette-memcache-sliding-key';
 $value = 'rulez';
 
 $cache = new Cache(new MemcachedStorage('localhost'));

Diff for: tests/Storages/Memcached.tags.phpt

@@ -17,33 +17,35 @@ if (!MemcachedStorage::isAvailable()) {
 	Tester\Environment::skip('Requires PHP extension Memcache.');
 }
 
+Tester\Environment::lock('memcached-tags', TEMP_DIR);
 
-$storage = new MemcachedStorage('localhost', 11211, '', new SQLiteJournal(TEMP_DIR . '/journal.s3db'));
+
+$storage = new MemcachedStorage('localhost', 11211, '', new SQLiteJournal(TEMP_DIR . '/journal-memcache.s3db'));
 $cache = new Cache($storage);
 
 
 // Writing cache...
-$cache->save('nette-tags-key1', 'value1', [
+$cache->save('nette-memcache-tags-key1', 'value1', [
 	Cache::TAGS => ['one', 'two'],
 ]);
 
-$cache->save('nette-tags-key2', 'value2', [
+$cache->save('nette-memcache-tags-key2', 'value2', [
 	Cache::TAGS => ['one', 'three'],
 ]);
 
-$cache->save('nette-tags-key3', 'value3', [
+$cache->save('nette-memcache-tags-key3', 'value3', [
 	Cache::TAGS => ['two', 'three'],
 ]);
 
-$cache->save('nette-tags-key4', 'value4');
+$cache->save('nette-memcache-tags-key4', 'value4');
 
 
 // Cleaning by tags...
 $cache->clean([
 	Cache::TAGS => 'one',
 ]);
 
-Assert::null($cache->load('nette-tags-key1'));
-Assert::null($cache->load('nette-tags-key2'));
-Assert::truthy($cache->load('nette-tags-key3'));
-Assert::truthy($cache->load('nette-tags-key4'));
+Assert::null($cache->load('nette-memcache-tags-key1'));
+Assert::null($cache->load('nette-memcache-tags-key2'));
+Assert::truthy($cache->load('nette-memcache-tags-key3'));
+Assert::truthy($cache->load('nette-memcache-tags-key4'));

Diff for: tests/Storages/NewMemcached.expiration.phpt

@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * Test: Nette\Caching\Storages\NewMemcachedStorage expiration test.
+ */
+
+use Nette\Caching\Storages\NewMemcachedStorage;
+use Nette\Caching\Cache;
+use Tester\Assert;
+
+
+require __DIR__ . '/../bootstrap.php';
+
+
+if (!NewMemcachedStorage::isAvailable()) {
+	Tester\Environment::skip('Requires PHP extension Memcached.');
+}
+
+Tester\Environment::lock('memcached-expiration', TEMP_DIR);
+
+
+$key = 'nette-memcached-expiration-key';
+$value = 'rulez';
+
+$cache = new Cache(new NewMemcachedStorage('localhost'));
+
+
+// Writing cache...
+$cache->save($key, $value, [
+	Cache::EXPIRATION => time() + 3,
+]);
+
+
+// Sleeping 1 second
+sleep(1);
+Assert::truthy($cache->load($key));
+
+
+// Sleeping 3 seconds
+sleep(3);
+Assert::null($cache->load($key));