<?php

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namespace Automattic\WooCommerce\Caching;

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/**

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* Implements namespacing algorithm to simulate grouping and namespacing for wp_cache, memcache and other caching engines that don't support grouping natively.

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*

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* See the algorithm details here: https://github.com/memcached/memcached/wiki/ProgrammingTricks#namespacing.

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*

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* To use the namespacing algorithm in the CacheEngine class:

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* 1. Use a group string to identify all objects of a type.

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* 2. Before setting cache, prefix the cache key by using the `get_cache_prefix`.

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* 3. Use `invalidate_cache_group` function to invalidate all caches in entire group at once.

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*/

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trait CacheNameSpaceTrait {

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/**

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* Get prefix for use with wp_cache_set. Allows all cache in a group to be invalidated at once.

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*

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* @param string $group Group of cache to get.

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* @return string Prefix.

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*/

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public static function get_cache_prefix( $group ) {

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// Get cache key - uses cache key wc_orders_cache_prefix to invalidate when needed.

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$prefix = wp_cache_get( 'wc_' . $group . '_cache_prefix', $group );

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if ( false === $prefix ) {

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$prefix = microtime();

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wp_cache_set( 'wc_' . $group . '_cache_prefix', $prefix, $group );

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}

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return 'wc_cache_' . $prefix . '_';

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}

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/**

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* Increment group cache prefix (invalidates cache).

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*

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* @param string $group Group of cache to clear.

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*/

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public static function incr_cache_prefix( $group ) {

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wc_deprecated_function( 'WC_Cache_Helper::incr_cache_prefix', '3.9.0', 'WC_Cache_Helper::invalidate_cache_group' );

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self::invalidate_cache_group( $group );

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}

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/**

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* Invalidate cache group.

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*

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* @param string $group Group of cache to clear.

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* @since 3.9.0

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*/

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public static function invalidate_cache_group( $group ) {

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return wp_cache_set( 'wc_' . $group . '_cache_prefix', microtime(), $group );

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}

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/**

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* Helper method to get prefixed key.

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*

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* @param string $key Key to prefix.

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* @param string $group Group of cache to get.

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*

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* @return string Prefixed key.

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*/

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public static function get_prefixed_key( $key, $group ) {

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return self::get_cache_prefix( $group ) . $key;

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}

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}

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