commit 32fb1097be1922dbb5158d7e3b2d8cfed1bdf423
author Edwin Kempin <ekempin@google.com> Thu Feb 25 17:24:53 2021 +0100
committer Edwin Kempin <ekempin@google.com> Fri Feb 26 09:30:00 2021 +0100
tree 42489e40b137beb6390376b78d94e33189cd3a4c
parent 01a80cbbcba0431d3a0c511a05608fc0a9182ef8

CodeOwnerApprovalCheck: Avoid double instantiation of PathCodeOwners

For every file touched in a change CodeOwnerApprovalCheck visits the
relevant code owner config files to compute path code owners.

This computation was done twice:

1. Once in CodeOwnerConfigHierarchy#visit which iterates over the
   relevant code owner config files for a path

2. Once in CodeOwnerResolver#resolvePathCodeOwners (invoked in
   CodeOwnerApprovalCheck#getCodeOwners which got called from the
   callback that is invoked from 1).

Now instead of instantiating PathCodeOwners again at 2. modifiy the
callback in 1. so that it provides the PathCodeOwners instance instead
of the plain CodeOwnerConfig.

There are other callers of 1. that only need the CodeOwnerConfig (and
not the PathCodeOwners). For them we keep the old callback that provides
CodeOwnerConfig, but now it's only a wrapper around the callback that
provides PathCodeOwners.

CodeOwnerResolver#resolvePathCodeOwners can be invoked either with a
CodeOwnerConfig (as before, still used by other callers) or with
PathCodeOwners (if PathCodeOwners are available this is preferred as it
avoids re-instantiating PathCodeOwners).

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: Ic092c3dbb6b98cd9490893a05747a6fd48d17d57