/**
* Write the item_id => total quantity pairing into the cache.
* @param int item id
* @param int total count, after db write
* if the total is less than zero, write it in as undefined in the cache so it doesn't hit the
* db again. With tally, the total is a number, but the serial total will be a quantity object.
* no matter. we can get it's total value easily enough by just getting strval of it.
* if there is a transaction attached, set up a callback to delete this key if the transaction doesn't work.
* can't delete the cache key for history since variations are endless, but we can bust the key
* using last touch. if we aren't in a transaction, just bust last touch right away.
* check the id index so we can update it in the cache.
* if nothing left of a given item, remove it from the index.
* if the item id is in the index, no more work needed.
* make sure the index is sorted the way it is supposed to be.
* always sorted in numeric order of item id.
*/
protected function writeToCache($item_id, $total)
{
$cache = $this->cacher;
$timeout = $this->cacheTimeout();
$cache->set($item_id, Base::quantify($total) > 0 ? $total : Store\Callback::UNDEF, $timeout);
if ($this->inTran()) {
Transaction::onRollback(array($cache, 'delete'), array($item_id));
Transaction::onRollback(array($this, 'lastTouch'), array(TRUE));
Transaction::onCommit(array($this, 'lastTouch'), array(TRUE));
} else {
$this->lastTouch(TRUE);
}
$index = $cache->get(self::INDEX_CACHEKEY);
if (!is_array($index)) {
return;
}
if (Base::quantify($total) > 0) {
if (in_array($item_id, $index)) {
return;
}
$index[] = $item_id;
sort($index, SORT_NUMERIC);
} else {
$found = array_keys($index, $item_id);
if (count($found) < 1) {
return;
}
foreach ($found as $k) {
unset($index[$k]);
}
}
$cache->set(self::INDEX_CACHEKEY, $index, $timeout);
}
