tree 5c4ad933c16105bb960863af6c314becc1345632
parent cf0c1800fda2de7123e7d61f35104331bd36cb6e
author adgar <adgar@google.com> 1565136161 -0700
committer Copybara-Service <copybara-worker@google.com> 1565136221 -0700

Refactor ParallelVisitor to support generic exceptions.

Fixes a type-unsafety bug in the declaration of
UnfilteredSkyKeyTTVDTCVisitor.Factory and its use in ParallelSkyQueryUtils.

This is in service of reusing the Parallel visitation framework for traversing
the skyframe graph in TraversalInfoRootPackageExtractor.

RELNOTES:
None.
PiperOrigin-RevId: 262026820