private function progressedWorkers()
{
$result = array();
foreach ($this->modified as $modifiedStream) {
$found = null;
foreach ($this->streams as $index => $stream) {
if ($modifiedStream == $stream) {
$found = $index;
break;
}
}
$result[$found] = $this->workers[$found];
}
$this->modified = array();
return $result;
}