In pipeline, method countSourceItems must implement count iterator

[lmikelionis]

So correct overall pipeline item count will be returned.

[mindaugasbarysas]

Iterators returned by pipeline source event listeners should implement Countable interface. Related pull request and an example how to handle this in DBAL is here: ongr-archive/xtCommerceConnectorBundle#39

as far as Doctrine ORM is concerned, these discussions might be of interest:
http://stackoverflow.com/questions/9214471/count-rows-in-doctrine-querybuilder,
http://stackoverflow.com/questions/8226874/symfony2-doctrine-get-number-of-rows-returned-from-datasource
as well as paginator:
http://docs.doctrine-project.org/en/latest/tutorials/pagination.html

[martiis]

What if SourcePipelineEvent would also implement countable interface? it would replace countSourceItems method.