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CacheService.php
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CacheService.php
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<?php
/**
* @author Bram Gerritsen bgerritsen@gmail.com
* @copyright (c) Bram Gerritsen 2013
* @license http://opensource.org/licenses/mit-license.php
*/
namespace StrokerCache\Service;
use StrokerCache\Exception\UnsupportedAdapterException;
use StrokerCache\IdGenerator\IdGeneratorInterface;
use Zend\Mvc\MvcEvent;
use StrokerCache\Event\CacheEvent;
use Zend\EventManager\EventManager;
use Zend\EventManager\EventManagerInterface;
use StrokerCache\Options\ModuleOptions;
use Zend\Cache\Storage\TaggableInterface;
use Zend\Cache\Storage\StorageInterface;
class CacheService
{
/**
* Prefix to use for the tag key
* @var string
*/
const TAG_PREFIX = 'strokercache_';
/**
* @var EventManagerInterface
*/
protected $eventManager;
/**
* @var StorageInterface
*/
protected $cacheStorage;
/**
* @var IdGeneratorInterface
*/
protected $idGenerator;
/**
* @var ModuleOptions
*/
protected $options;
/**
* Default constructor
*
* @param StorageInterface $cacheStorage
* @param ModuleOptions $options
* @param IdGeneratorInterface $idGenerator
*/
public function __construct(StorageInterface $cacheStorage, ModuleOptions $options, IdGeneratorInterface $idGenerator = null)
{
$this->setCacheStorage($cacheStorage);
$this->setOptions($options);
$this->setIdGenerator($idGenerator);
}
/**
* Check if a page is saved in the cache and return contents. Return null when no item is found.
*
* @param MvcEvent $mvcEvent
* @return mixed|null
*/
public function load(MvcEvent $mvcEvent)
{
$id = $this->getIdGenerator()->generate();
if (!$this->getCacheStorage()->hasItem($id)) {
return null;
};
$event = $this->createCacheEvent(CacheEvent::EVENT_LOAD, $mvcEvent, $id);
$results = $this->getEventManager()->triggerEventUntil(function ($result) {
return ($result === false);
}, $event);
if ($results->stopped()) {
return null;
}
return $this->getCacheStorage()->getItem($id);
}
/**
* Save the page contents to the cache storage.
*
* @param MvcEvent $mvcEvent
*/
public function save(MvcEvent $mvcEvent)
{
if (!$this->shouldCacheRequest($mvcEvent)) {
return;
}
$id = $this->getIdGenerator()->generate();
$item = ($this->getOptions()->getCacheResponse() === true) ? serialize($mvcEvent->getResponse()) : $mvcEvent->getResponse()->getContent();
$this->getCacheStorage()->setItem($id, $item);
$cacheEvent = $this->createCacheEvent(CacheEvent::EVENT_SAVE, $mvcEvent, $id);
$this->getEventManager()->triggerEvent($cacheEvent);
$cacheStorage = $this->getCacheStorage();
if ($cacheStorage instanceof TaggableInterface) {
$tags = array_unique(array_merge($this->getTags($mvcEvent), $cacheEvent->getTags()));
$cacheStorage->setTags($id, $this->prefixTags($tags));
}
}
/**
* Determine if we should cache the current request
*
* @param MvcEvent $mvcEvent
* @return bool
*/
protected function shouldCacheRequest(MvcEvent $mvcEvent)
{
$event = $this->createCacheEvent(CacheEvent::EVENT_SHOULDCACHE, $mvcEvent);
$results = $this->getEventManager()->triggerEventUntil(function ($result) {
return $result;
}, $event);
if ($results->stopped()) {
return $results->last();
}
return false;
}
/**
* @param array $tags
* @param bool|null $disjunction
* @return bool
* @throws UnsupportedAdapterException
*/
public function clearByTags(array $tags = array(), $disjunction = null)
{
$cacheStorage = $this->getCacheStorage();
if (!$cacheStorage instanceof TaggableInterface) {
throw new UnsupportedAdapterException('purging by tags is only supported on adapters implementing the TaggableInterface');
}
$tags = $this->prefixTags($tags);
return $cacheStorage->clearByTags($tags, $disjunction);
}
/**
* Cache tags to use for this page
*
* @param MvcEvent $event
* @return array
*/
public function getTags(MvcEvent $event)
{
$routeName = $event->getRouteMatch()->getMatchedRouteName();
$tags = [
'route_' . $routeName
];
foreach ($event->getRouteMatch()->getParams() as $key => $value) {
if ($key == 'controller') {
$tags[] = 'controller_' . $value;
} else {
$tags[] = 'param_' . $key . '_' . $value;
}
}
return $tags;
}
/**
* @param array $tags
*
* @return array
*/
private function prefixTags(array $tags)
{
return array_map(
function ($tag) { return CacheService::TAG_PREFIX . $tag; },
$tags
);
}
/**
* @param string $eventName
* @param string $cacheKey
* @param MvcEvent|null $mvcEvent
* @return CacheEvent
*/
protected function createCacheEvent($eventName, MvcEvent $mvcEvent = null, $cacheKey = null)
{
$cacheEvent = new CacheEvent($eventName, $this);
$cacheEvent->setCacheKey($cacheKey);
if ($mvcEvent !== null) {
$cacheEvent->setMvcEvent($mvcEvent);
}
return $cacheEvent;
}
/**
* @return StorageInterface
*/
public function getCacheStorage()
{
return $this->cacheStorage;
}
/**
* @param StorageInterface $cacheStorage
* @return self
*/
public function setCacheStorage($cacheStorage)
{
$this->cacheStorage = $cacheStorage;
return $this;
}
/**
* @return ModuleOptions
*/
public function getOptions()
{
return $this->options;
}
/**
* @param ModuleOptions $options
* @return self
*/
public function setOptions($options)
{
$this->options = $options;
return $this;
}
/**
* Inject an EventManager instance
*
* @param EventManagerInterface $eventManager
* @return self
*/
public function setEventManager(EventManagerInterface $eventManager)
{
$eventManager->setIdentifiers([__CLASS__, get_called_class()]);
$this->eventManager = $eventManager;
return $this;
}
/**
* Retrieve the event manager
*
* Lazy-loads an EventManager instance if none registered.
*
* @return EventManagerInterface
*/
public function getEventManager()
{
if (!$this->eventManager instanceof EventManagerInterface) {
$this->setEventManager(new EventManager());
}
return $this->eventManager;
}
/**
* @return IdGeneratorInterface
*/
public function getIdGenerator()
{
return $this->idGenerator;
}
/**
* @param IdGeneratorInterface $idGenerator
*/
public function setIdGenerator($idGenerator = null)
{
$this->idGenerator = $idGenerator;
}
}