Cache Patterns

In This Article

ObjectCache

The ObjectCache pattern is an extension to the CallbackCache pattern. It has the same methods, but instead caches output from any instance method calls or public properties.

Quick Start

use stdClass;
use Zend\Cache\PatternFactory;

$object      = new stdClass();
$objectCache = PatternFactory::factory('object', [
    'object'  => $object,
    'storage' => 'apc'
]);

Configuration Options

Option Data Type Default Value Description
storage string | array | Zend\Cache\Storage\StorageInterface none Adapter used for reading and writing cached data.
object object none The object for which to cache method calls.
object_key null | string Class name of object Hopefully unique!
cache_output boolean true Whether or not to cache method output.
cache_by_default boolean true Cache all method calls by default.
object_cache_methods array [] List of methods to cache (if cache_by_default is disabled).
object_non_cache_methods array [] List of methods to blacklist (if cache_by_default is enabled).
object_cache_magic_properties boolean false Whether or not to cache properties exposed by method overloading.

Available Methods

In addition to the methods defined in PatternInterface, this implementation defines the following methods.

namespace Zend\Cache\Pattern;

use Zend\Cache\Exception;

class ObjectCache extends CallbackCache
{
    /**
     * Call and cache a class method
     *
     * @param  string $method  Method name to call
     * @param  array  $args    Method arguments
     * @return mixed
     * @throws Exception\RuntimeException
     * @throws \Exception
     */
    public function call($method, array $args = []);

    /**
     * Method overloading: proxies to call().
     *
     * @param  string $method  Method name to call
     * @param  array  $args    Method arguments
     * @return mixed
     * @throws Exception\RuntimeException
     * @throws \Exception
     */
    public function __call($method, array $args);

    /**
     * Generate a unique key in base of a key representing the callback part
     * and a key representing the arguments part.
     *
     * @param  string     $method  The method
     * @param  array      $args    Callback arguments
     * @return string
     * @throws Exception\RuntimeException
     */
    public function generateKey($method, array $args = []);

    /**
     * Property overloading: write data to a named property.
     *
     * NOTE:
     * Magic properties will be cached too if the option cacheMagicProperties
     * is enabled and the property doesn't exist in real. If so it calls __set
     * and removes cached data of previous __get and __isset calls.
     *
     * @param  string $name
     * @param  mixed  $value
     * @return void
     * @see    http://php.net/manual/language.oop5.overloading.php#language.oop5.overloading.members
     */
    public function __set($name, $value);

    /**
     * Property overloading: read data from a named property.
     *
     * NOTE:
     * Magic properties will be cached too if the option cacheMagicProperties
     * is enabled and the property doesn't exist in real. If so it calls __get.
     *
     * @param  string $name
     * @return mixed
     * @see http://php.net/manual/language.oop5.overloading.php#language.oop5.overloading.members
     */
    public function __get($name);

    /**
     * Property overloading: check if a named property exists.
     *
     * NOTE:
     * Magic properties will be cached too if the option cacheMagicProperties
     * is enabled and the property doesn't exist in real. If so it calls __get.
     *
     * @param  string $name
     * @return bool
     * @see    http://php.net/manual/language.oop5.overloading.php#language.oop5.overloading.members
     */
    public function __isset($name);

    /**
     * Property overloading: unset a named property.
     *
     * NOTE:
     * Magic properties will be cached too if the option cacheMagicProperties
     * is enabled and the property doesn't exist in real. If so it removes
     * previous cached __isset and __get calls.
     *
     * @param  string $name
     * @return void
     * @see    http://php.net/manual/language.oop5.overloading.php#language.oop5.overloading.members
     */
    public function __unset($name);

    /**
     * Handle casting to string
     *
     * @return string
     * @see    http://php.net/manual/language.oop5.magic.php#language.oop5.magic.tostring
     */
    public function __toString();

    /**
     * Intercept and cache invokable usage.
     *
     * @return mixed
     * @see    http://php.net/manual/language.oop5.magic.php#language.oop5.magic.invoke
     */
    public function __invoke();
}

Examples

Caching a Filter

$filter       = new Zend\Filter\RealPath();
$cachedFilter = Zend\Cache\PatternFactory::factory('object', [
    'object'     => $filter,
    'object_key' => 'RealpathFilter',
    'storage'    => 'apc',

    // The realpath filter doesn't output anything
    // so the output don't need to be caught and cached
    'cache_output' => false,
]);

$path = $cachedFilter->call("filter", ['/www/var/path/../../mypath']);

// OR
$path = $cachedFilter->filter('/www/var/path/../../mypath');

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