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<?php
namespace SMW\Utils;
/**
* @license GNU GPL v2+
* @since 3.0
*
* @author mwjames
*/
class Lru {
/**
* @var integer
*/
private $size;
/**
* @var array
*/
private $cache = [];
/**
* @var array
*/
private $count = 0;
/**
* @since 3.0
*
* @param integer size
*/
public function __construct( $size = 1000 ) {
$this->size = $size;
}
/**
* @since 3.0
*
* @param string|integer $key
* @param mixed $value
*/
public function set( $key, $value ) {
$this->count++;
if ( isset( $this->cache[$key] ) ) {
$this->count--;
$value = $this->cache[$key];
unset( $this->cache[$key] );
} elseif ( $this->count > $this->size ) {
$this->count--;
reset( $this->cache );
unset( $this->cache[ key( $this->cache ) ] );
}
$this->cache[$key] = $value;
}
/**
* @since 3.0
*
* @param string|integer $key
*
* @return mixed
*/
public function get( $key, $default = null ) {
if ( !isset( $this->cache[$key] ) ) {
return $default;
}
$value = $this->cache[$key];
unset( $this->cache[$key] );
$this->cache[$key] = $value;
return $value;
}
/**
* @since 3.0
*
* @param string|integer $key
*/
public function delete( $key ) {
if ( !isset( $this->cache[$key] ) ) {
return $default;
}
$this->count--;
unset( $this->cache[$key] );
}
/**
* @since 3.0
*/
public function toArray() {
return $this->cache;
}
}
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