DigiComp.Sequence

This is a very simple tool, helping in generation of gapless sequences. For this task it relies on key integrity of the database of your choice.

Usage is quite simple also:

/**
 * @param SequenceNumberGenerator $sequenceNumberGenerator
 */
public function __construct(SequenceNumberGenerator $sequenceNumberGenerator)
{
    $this->orderId = $sequenceNumberGenerator->getNextNumberFor($this);
}

getNextNumberFor allows you to give an object (which will be resolved to its FQCN) or a custom sequence name.

The SequenceCommandController helps you to advance the current sequence number, in case of migrations or similar. See ./flow help sequence:advance if interested.