$mapFn has signature ($item, $mapEmit) where $item is item from data and $mapEmit is emit function
$reduceFn has signature ($key, $items, $reduceEmit) where $key is the key the data are grouped by,
$items is the group and $reduce emit is an emit function
$mapEmit has signature ($key, $value) where $key is the key the data are grouped by and $value is
a transformed item
$reduceEmit has signature ($obj) where $obj is the transformed group
private function groupBulkActions($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 $changeInfos;
}
private function groupBulkActions($changeInfoList)
{
$groupedChangeInfos = ArrayUtils::mapreduce($changeInfoList, function (ChangeInfo $item, $mapEmit) {
if ($item instanceof TrackedChangeInfo) {
$key = "{$item->getScope()}/{$item->getAction()}";
$mapEmit($key, $item);
} else {
$mapEmit(spl_object_hash($item), $item);
}
}, function ($key, $items, $reduceEmit) {
/** @var TrackedChangeInfo[] $items */
if (count($items) > 1) {
$reduceEmit(new BulkChangeInfo($items));
} else {
$reduceEmit($items[0]);
}
});
$changeInfos = [];
foreach ($groupedChangeInfos as $changeInfoGroup) {
if (is_array($changeInfoGroup)) {
foreach ($changeInfoGroup as $changeInfo) {
$changeInfos[] = $changeInfo;
}
} else {
$changeInfos[] = $changeInfoGroup;
}
}
return $changeInfos;
}
