mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Echo
synced 2024-09-25 03:09:37 +00:00
dc7d27a795
Doing it in two lines makes it easier to read This makes also clear that this is not a broken condition Change-Id: I9771b6457789b7dc572f2d73d1fae8c361f9a1e6
67 lines
1.8 KiB
PHP
67 lines
1.8 KiB
PHP
<?php
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/**
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* Caches an EchoContainmentList within a BagOStuff(memcache, etc) to prevent needing
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* to load the nested list from a potentially slow source (mysql, etc).
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*/
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class EchoCachedList implements EchoContainmentList {
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const ONE_WEEK = 4233600;
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const ONE_DAY = 86400;
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protected $cache;
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protected $partialCacheKey;
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protected $nestedList;
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protected $timeout;
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private $result;
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/**
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* @param BagOStuff $cache Bag to stored cached data in.
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* @param string $partialCacheKey Partial cache key, $nestedList->getCacheKey() will be appended
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* to this to construct the cache key used.
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* @param EchoContainmentList $nestedList The nested EchoContainmentList to cache the result of.
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* @param int $timeout How long in seconds to cache the nested list, defaults to 1 week.
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*/
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public function __construct( BagOStuff $cache, $partialCacheKey, EchoContainmentList $nestedList, $timeout = self::ONE_WEEK ) {
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$this->cache = $cache;
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$this->partialCacheKey = $partialCacheKey;
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$this->nestedList = $nestedList;
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$this->timeout = $timeout;
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}
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/**
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* @inheritDoc
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*/
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public function getValues() {
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if ( $this->result ) {
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return $this->result;
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}
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$cacheKey = $this->getCacheKey();
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$fetched = $this->cache->get( $cacheKey );
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if ( is_array( $fetched ) ) {
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$this->result = $fetched;
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return $this->result;
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}
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$result = $this->nestedList->getValues();
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if ( !is_array( $result ) ) {
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throw new MWException( sprintf(
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"Expected array but received '%s' from '%s::getValues'",
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is_object( $result ) ? get_class( $result ) : gettype( $result ),
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get_class( $this->nestedList )
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) );
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}
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$this->cache->set( $cacheKey, $result, $this->timeout );
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$this->result = $result;
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return $this->result;
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}
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/**
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* @inheritDoc
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*/
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public function getCacheKey() {
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return $this->partialCacheKey . '_' . $this->nestedList->getCacheKey();
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}
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}
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