Add timeout to DiffOperations

The odd diff cache - PatchListCache - had a timeout implemented in its
PatchListLoader. This change adds the same timeout to DiffOperations -
the interface using the new diff cache.

PatchListLoader uses the histogram diff algorithm by default, and if it
times out, the cache loader falls back to using the algorithm without
myers diff, hence doing the computation faster - check [1]. This is done
silently with a warning log message. In the new diff cache, the diff
algorithm is part of the cache key, and accordingly in this change, the
timeout exception is propagated from DiffOperations to callers. It's up
to callers to request the diff again with another diff algorithm.

The timeout employed by this change is implemented outside the cache,
i.e. in DiffOperations. A slight change to the documentation at [2] is
to be made in a future change (after fully deploying the new cache) to
highlight the new behaviour.

[1]
https://gerrit.googlesource.com/gerrit/+/ec0f7eae9d6d067e9868d7f9177c6b2f7bcf196d/java/com/google/gerrit/server/patch/filediff/PatchListLoader.java#549
[2]
https://gerrit-review.googlesource.com/Documentation/config-gerrit.html#cache.diff.timeout

Change-Id: I87d2b01b208db8648648a87d03eeb62e88c81607
1 file changed
tree: 51a2d1ff531dce0924b997cd612833586e93c503
  1. .settings/
  2. .ts-out/
  3. antlr3/
  4. contrib/
  5. Documentation/
  6. e2e-tests/
  7. java/
  8. javatests/
  9. lib/
  10. modules/
  11. plugins/
  12. polygerrit-ui/
  13. prolog/
  14. prologtests/
  15. proto/
  16. resources/
  17. tools/
  18. webapp/
  19. .bazelignore
  20. .bazelproject
  21. .bazelrc
  22. .bazelversion
  23. .editorconfig
  24. .git-blame-ignore-revs
  25. .gitignore
  26. .gitmodules
  27. .gitreview
  28. .mailmap
  29. .pydevproject
  30. .zuul.yaml
  31. BUILD
  32. COPYING
  33. INSTALL
  34. Jenkinsfile
  35. package.json
  36. README.md
  37. SUBMITTING_PATCHES
  38. version.bzl
  39. WORKSPACE
  40. yarn.lock
README.md

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