/**
* Add an executable in the tier it wants to be run in, or the
* next stage if no tier is set.
* @param Executable $executable
* @throws TierException
*/
public function addExecutable(Executable $executable)
{
$tierNumber = $executable->getTierNumber();
$nextStage = $this->currentTier + 1;
if ($tierNumber === null) {
$tierNumber = $nextStage;
}
if ($tierNumber < $this->currentTier) {
$message = sprintf("Cannot add executable to tier %d as current tier is %d", $tierNumber, $this->currentTier);
throw new TierException($message, TierException::INCORRECT_VALUE);
}
$this->addExecutableToTier($tierNumber, $executable);
}