Github user okram commented on the pull request:
https://github.com/apache/incubator-tinkerpop/pull/299#issuecomment-215977029
I don't think you need to put as may interrupt checks. Most steps inherit
from `AbstractStep` and thus, if `AbstractStep.next()` and
`AbstractStep.hasNext()` have the interrupt check, then all the
`processNextStart()` in subclasses don't need to check for the interrupt. This
should greatly reduce the amount of classes touched and requirements on
providers with their own step implementations. In short, they just need to make
sure they extend `AbstractStep`. However, with that said, I still think you
need the `VertexProgramStep` work in there as you have it.
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