stack_cache_entry.php

См. документацию.

<?php

 
class CStackCacheEntry
{
    var $entity = "";
    var $id = "";
    var $values = array();
    var $len = 10;
    var $ttl = 3600;
    var $cleanGet = true;
    var $cleanSet = true;
 
    function __construct($entity, $length = 0, $ttl = 0)
    {
        $this->entity = $entity;
 
        if($length > 0)
            $this->len = intval($length);
 
        if($ttl > 0)
            $this->ttl = intval($ttl);
    }
 
    function SetLength($length)
    {
        if($length > 0)
            $this->len = intval($length);
 
        while(count($this->values) > $this->len)
        {
            $this->cleanSet = false;
            array_shift($this->values);
        }
    }
 
    function SetTTL($ttl)
    {
        if($ttl > 0)
            $this->ttl = intval($ttl);
    }
 
    function Load()
    {
        global $DB;
        $objCache = \Bitrix\Main\Data\Cache::createInstance();
        if($objCache->InitCache($this->ttl, $this->entity, $DB->type."/".$this->entity, "stack_cache"))
        {
            $this->values = $objCache->GetVars();
            $this->cleanGet = true;
            $this->cleanSet = true;
        }
    }
 
    function DeleteEntry($id)
    {
        if(array_key_exists($id, $this->values))
        {
            unset($this->values[$id]);
            $this->cleanSet = false;
        }
    }
 
    function Clean()
    {
        global $DB;
 
        $objCache = \Bitrix\Main\Data\Cache::createInstance();
        $objCache->Clean($this->entity, $DB->type."/".$this->entity, "stack_cache");
 
        $this->values = array();
        $this->cleanGet = true;
        $this->cleanSet = true;
    }
 
    function Get($id)
    {
        if(array_key_exists($id, $this->values))
        {
            $result = $this->values[$id];
            //Move accessed value to the top of list only when it is not at the top
            end($this->values);
            if(key($this->values) !== $id)
            {
                $this->cleanGet = false;
                unset($this->values[$id]);
                $this->values = $this->values + array($id => $result);
            }
 
            return $result;
        }
        else
        {
            return false;
        }
    }
 
    function Set($id, $value)
    {
        if(array_key_exists($id, $this->values))
        {
            unset($this->values[$id]);
            $this->values = $this->values + array($id => $value);
        }
        else
        {
            $this->values = $this->values + array($id => $value);
            while(count($this->values) > $this->len)
                array_shift($this->values);
        }
 
        $this->cleanSet = false;
    }
 
    function Save()
    {
        if (defined("BITRIX_SKIP_STACK_CACHE") && BITRIX_SKIP_STACK_CACHE)
            return;
 
        global $DB;
 
        if(
            !$this->cleanSet
            || (
                !$this->cleanGet
                && (count($this->values) >= $this->len)
            )
        )
        {
            $objCache = \Bitrix\Main\Data\Cache::createInstance();
 
            //Force cache rewrite
            $objCache->forceRewriting(true);
 
            if($objCache->startDataCache($this->ttl, $this->entity, $DB->type."/".$this->entity, $this->values, "stack_cache"))
            {
                $objCache->endDataCache();
            }
 
            $this->cleanGet = true;
            $this->cleanSet = true;
        }
    }
}