tree 58c1adc060d1d879d1de3a28d607b35dcf1ad865
parent 08aa8bb89d4199bdd91c4b3f02f1642ccb05a9b0
author Dave Borowitz <dborowitz@google.com> 1522944433 -0400
committer Dave Borowitz <dborowitz@google.com> 1524676026 -0400

Move PrologEnvironment creation out of ProjectState

The PrologMachineCopy field in ProjectState was an obtuse way of
upgrading the weak reference stored in the RulesCache to a strong
reference. Now that RulesCache stores strong references on its own, we
can just call into RulesCache at exactly the time it's needed, namely in
PrologRuleEvaluator.

Moving this out of ProjectState helps with untangling the cacheable and
non-cacheable pieces of this class; for context, see:
https://gerrit-review.googlesource.com/c/gerrit/+/167053

Change-Id: I4beda2c9ddcf0014c606c0bee01ec49dde419361