CBPTaskService::update

static function update($id, $arFields)
{
	global $DB;

	$id = intval($id);
	if ($id <= 0)
	{
		throw new Exception("id");
	}

	self::ParseFields($arFields, $id);

	$strUpdate = $DB->PrepareUpdate("b_bp_task", $arFields);

	if ($strUpdate)
	{
		$strSql =
			"UPDATE b_bp_task SET ".
			"	".$strUpdate.", ".
			"	MODIFIED = ".$DB->CurrentTimeFunction()." ".
			"WHERE ID = ".intval($id)." ";
		$DB->Query($strSql, False, "File: ".__FILE__."
Line: ".__LINE__);
	}

	$removedUsers = $addedUsers = $decremented = $incremented = [];

	if (is_set($arFields, 'USERS'))
	{
		$arFields['USERS'] = array_map('intval', array_unique($arFields['USERS']));
		$previousUserIds = static::getTaskUserIds($id);

		foreach ($arFields['USERS'] as $userId)
		{
			if (in_array($userId, $previousUserIds, true))
			{
				continue;
			}

			$DB->Query(
				"INSERT INTO b_bp_task_user (USER_ID, TASK_ID, ORIGINAL_USER_ID) ".
				"VALUES ({$userId}, {$id}, {$userId})"
			);

			$incremented[] = $userId;
			CUserCounter::Increment($userId, 'bp_tasks', '**');
		}

		$diff = array_diff($previousUserIds, $arFields['USERS']);
		foreach ($diff as $removedUserId)
		{
			$decremented[] = $removedUserId;
			CUserCounter::Decrement($removedUserId, 'bp_tasks', '**');
			$removedUsers[] = $removedUserId;
			$DB->Query("DELETE FROM b_bp_task_user WHERE TASK_ID = {$id} AND USER_ID = {$removedUserId}");
		}
	}

	$userStatuses = array();
	if (isset($arFields['STATUS']) && $arFields['STATUS'] > CBPTaskStatus::Running)
	{
		$dbResUser = $DB->Query("SELECT USER_ID FROM b_bp_task_user WHERE TASK_ID = ".$id." AND STATUS = ".CBPTaskUserStatus::Waiting);
		while ($userIterator = $dbResUser->Fetch())
		{
			$decremented[] = $userIterator["USER_ID"];
			CUserCounter::Decrement($userIterator["USER_ID"], 'bp_tasks', '**');

			if ($arFields['STATUS'] == CBPTaskStatus::Timeout)
				$userStatuses[$userIterator["USER_ID"]] = CBPTaskUserStatus::No;
			else
				$removedUsers[] = $userIterator["USER_ID"];
		}
		if ($arFields['STATUS'] == CBPTaskStatus::Timeout)
		{
			$DB->Query("UPDATE b_bp_task_user SET STATUS = ".CBPTaskUserStatus::No.", DATE_UPDATE = ".$DB->CurrentTimeFunction()
				." WHERE TASK_ID = ".$id." AND STATUS = ".CBPTaskUserStatus::Waiting);
		}
		else
			$DB->Query("DELETE FROM b_bp_task_user WHERE TASK_ID = ".$id." AND STATUS = ".CBPTaskUserStatus::Waiting);
	}

	foreach (GetModuleEvents("bizproc", "OnTaskUpdate", true) as $arEvent)
		ExecuteModuleEventEx($arEvent, array($id, $arFields));

	if ($removedUsers)
	{
		$arFields['USERS_REMOVED'] = $removedUsers;
	}
	if ($addedUsers)
	{
		$arFields['USERS_ADDED'] = $addedUsers;
	}
	if ($userStatuses)
	{
		$arFields['USERS_STATUSES'] = $userStatuses;
	}

	$arFields['COUNTERS_INCREMENTED'] = $incremented;
	$arFields['COUNTERS_DECREMENTED'] = $decremented;

	self::onTaskChange($id, $arFields, CBPTaskChangedStatus::Update);
	return $id;
}