/**
* 还原快照
* @param int $user_id 用户ID
* @param int $dateline 时间
* @return bool
*/
public function recover_snapshot($user_id, $dateline)
{
if ($this->save_snapshot($user_id)) {
$old_contact_list = $this->get($user_id);
$old_ids = array_keys($old_contact_list);
if ($this->contact_mapper->recover_snapshot($user_id, $dateline)) {
//缓存未清，须从数据库读取
$new_contact_list = $this->get_list($user_id);
$new_ids = array_keys($new_contact_list);
//相同的ID,更新时间不一致的作更新操作
$updated_ids = array_intersect($old_ids, $new_ids);
if ($updated_ids) {
foreach ($updated_ids as $key => $id) {
if ($old_contact_list[$id]['modified_at'] == $new_contact_list[$id]['modified_at']) {
unset($updated_ids[$key]);
}
}
}
//原来有，现在没有的ID,作删除操作
$deleted_ids = array_diff($old_ids, $new_ids);
//原来没有，现在有的ID,作新增操作
$added_ids = array_diff($new_ids, $old_ids);
$this->prepare_task($user_id, $added_ids, $updated_ids, $deleted_ids);
return TRUE;
}
}
return FALSE;
}
