public static function mapreduce($data, $mapFn, $reduceFn)
{
$mapResult = [];
$reduceResult = [];
$mapEmit = function ($key, $value) use(&$mapResult) {
$mapResult[$key][] = $value;
};
$reduceEmit = function ($obj) use(&$reduceResult) {
$reduceResult[] = $obj;
};
foreach ($data as $item) {
$mapFn($item, $mapEmit);
}
foreach ($mapResult as $key => $value) {
$reduceFn($key, $mapResult[$key], $reduceEmit);
}
return $reduceResult;
} private function groupBulkActions($changeInfoList)
{
$bulkChangeInfoClasses = $this->bulkChangeInfoClasses;
$groupedChangeInfos = ArrayUtils::mapreduce($changeInfoList, function (TrackedChangeInfo $item, $mapEmit) {
$key = "{$item->getEntityName()}/{$item->getAction()}";
$mapEmit($key, $item);
}, function ($key, $items, $reduceEmit) use($bulkChangeInfoClasses) {
/** @var TrackedChangeInfo[] $items */
if (count($items) > 1) {
$entityName = $items[0]->getEntityName();
if (isset($bulkChangeInfoClasses[$entityName])) {
$reduceEmit(new $bulkChangeInfoClasses[$entityName]($items));
} else {
$reduceEmit($items);
}
} else {
$reduceEmit($items[0]);
}
});
$changeInfos = array();
foreach ($groupedChangeInfos as $changeInfoGroup) {
if (is_array($changeInfoGroup)) {
foreach ($changeInfoGroup as $changeInfo) {
$changeInfos[] = $changeInfo;
}
} else {
$changeInfos[] = $changeInfoGroup;
}
}
return $changeInfos;
}
