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<?php |
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namespace Onoi\Cache; |
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/** |
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* Implements a simple LRU (Least Recently Used) algorithm for a fixed in-memory |
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* hashmap |
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* |
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* @note For a size of more than 10K it is suggested to use PHP's SplFixedArray |
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* instead as it is optimized for large array sets |
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* |
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* @license GNU GPL v2+ |
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* @since 1.0 |
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*/ |
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class FixedInMemoryLruCache implements Cache { |
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/** |
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* @var array |
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*/ |
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private $cache = array(); |
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/** |
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* @var array |
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*/ |
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private $ttl = array(); |
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/** |
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* @var integer |
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*/ |
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private $maxCacheCount; |
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/** |
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* @var integer |
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*/ |
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private $count = 0; |
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/** |
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* @var integer |
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*/ |
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private $cacheInserts = 0; |
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/** |
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* @var integer |
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*/ |
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private $cacheDeletes = 0; |
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/** |
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* @var integer |
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*/ |
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private $cacheHits = 0; |
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/** |
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* @var integer |
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*/ |
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private $cacheMisses = 0; |
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/** |
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* @since 1.0 |
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* |
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* @param integer $maxCacheCount |
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*/ |
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public function __construct( $maxCacheCount = 500 ) { |
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$this->maxCacheCount = (int)$maxCacheCount; |
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} |
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/** |
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* @since 1.0 |
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* |
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* {@inheritDoc} |
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*/ |
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public function contains( $id ) { |
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$contains = isset( $this->cache[ $id ] ) || array_key_exists( $id, $this->cache ); |
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if ( !$contains ) { |
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return false; |
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} |
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if ( $this->ttl[ $id ] > 0 && $this->ttl[ $id ] <= microtime( true ) ) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* @since 1.0 |
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* |
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* {@inheritDoc} |
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*/ |
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public function fetch( $id ) { |
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if ( $this->contains( $id ) ) { |
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$this->cacheHits++; |
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return $this->moveToMostRecentlyUsedPosition( $id ); |
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} |
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$this->cacheMisses++; |
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return false; |
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} |
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/** |
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* @since 1.0 |
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* |
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* {@inheritDoc} |
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*/ |
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public function save( $id, $value, $ttl = 0 ) { |
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$this->count++; |
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$this->cacheInserts++; |
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if ( $this->contains( $id ) ) { |
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$this->count--; |
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$this->moveToMostRecentlyUsedPosition( $id ); |
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} elseif ( $this->count > $this->maxCacheCount ) { |
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$this->count--; |
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reset( $this->cache ); |
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unset( $this->cache[ key( $this->cache ) ] ); |
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} |
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$this->cache[ $id ] = $value; |
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$this->ttl[ $id ] = $ttl > 0 ? microtime( true ) + $ttl : 0; |
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} |
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/** |
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* @since 1.0 |
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* |
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* {@inheritDoc} |
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*/ |
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public function delete( $id ) { |
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if ( $this->contains( $id ) ) { |
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$this->count--; |
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$this->cacheDeletes++; |
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unset( $this->cache[ $id ] ); |
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unset( $this->ttl[ $id ] ); |
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return true; |
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} |
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return false; |
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} |
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/** |
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* @since 1.0 |
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* |
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* {@inheritDoc} |
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*/ |
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public function getStats() { |
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return array( |
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'inserts' => $this->cacheInserts, |
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'deletes' => $this->cacheDeletes, |
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'max' => $this->maxCacheCount, |
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'count' => $this->count, |
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'hits' => $this->cacheHits, |
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'misses' => $this->cacheMisses |
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); |
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} |
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/** |
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* @since 1.2 |
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* |
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162
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* {@inheritDoc} |
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*/ |
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164
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1 |
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public function getName() { |
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return __CLASS__; |
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} |
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private function moveToMostRecentlyUsedPosition( $id ) { |
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$value = $this->cache[ $id ]; |
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unset( $this->cache[ $id ] ); |
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$this->cache[ $id ] = $value; |
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return $value; |
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} |
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} |
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onoi /
cache
