yiiapi/framework/caching/CCache.php

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<?php
/**
 * CCache class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright 2008-2013 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CCache is the base class for cache classes with different cache storage implementation.
 *
 * A data item can be stored in cache by calling {@link set} and be retrieved back
 * later by {@link get}. In both operations, a key identifying the data item is required.
 * An expiration time and/or a dependency can also be specified when calling {@link set}.
 * If the data item expires or the dependency changes, calling {@link get} will not
 * return back the data item.
 *
 * Note, by definition, cache does not ensure the existence of a value
 * even if it does not expire. Cache is not meant to be a persistent storage.
 *
 * CCache implements the interface {@link ICache} with the following methods:
 * <ul>
 * <li>{@link get} : retrieve the value with a key (if any) from cache</li>
 * <li>{@link set} : store the value with a key into cache</li>
 * <li>{@link add} : store the value only if cache does not have this key</li>
 * <li>{@link delete} : delete the value with the specified key from cache</li>
 * <li>{@link flush} : delete all values from cache</li>
 * </ul>
 *
 * Child classes must implement the following methods:
 * <ul>
 * <li>{@link getValue}</li>
 * <li>{@link setValue}</li>
 * <li>{@link addValue}</li>
 * <li>{@link deleteValue}</li>
 * <li>{@link getValues} (optional)</li>
 * <li>{@link flushValues} (optional)</li>
 * <li>{@link serializer} (optional)</li>
 * </ul>
 *
 * CCache also implements ArrayAccess so that it can be used like an array.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.caching
 * @since 1.0
 */
abstract class CCache extends CApplicationComponent implements ICache, ArrayAccess
{
	/**
	 * @var string a string prefixed to every cache key so that it is unique. Defaults to null which means
	 * to use the {@link CApplication::getId() application ID}. If different applications need to access the same
	 * pool of cached data, the same prefix should be set for each of the applications explicitly.
	 */
	public $keyPrefix;
	/**
	 * @var boolean whether to md5-hash the cache key for normalization purposes. Defaults to true. Setting this property to false makes sure the cache
	 * key will not be tampered when calling the relevant methods {@link get()}, {@link set()}, {@link add()} and {@link delete()}. This is useful if a Yii
	 * application as well as an external application need to access the same cache pool (also see description of {@link keyPrefix} regarding this use case).