Refactor persistent workers to use SpawnRunner.

Change the persistent worker spawn strategy to extend
AbstractSpawnStrategy and put the actual logic into
WorkerSpawnRunner. WorkerTestStrategy is unaffected.

I had to extend SpawnPolicy with a speculating() method. Persistent
workers need to know if speculation is happening in order to require
sandboxing.

Additionally, I added java_test rules for the local runner tests and
worker tests. See https://github.com/bazelbuild/bazel/issues/3481.

NOTE: ulfjack@ made some changes to this change before merging:
 - changed Reporter to EventHandler; added TODO about its usage
 - reverted non-semantic indentation change in AbstractSpawnStrategy
 - reverted a non-semantic indentation change in WorkerSpawnRunner
 - updated some internal classes to match
 - removed catch IOException in WorkerSpawnRunner in some cases,
   removed verboseFailures flag from WorkerSpawnRunner, updated callers
 - disable some tests on Windows; we were previously not running them,
   now that we do, they fail :-(

Change-Id: I207b3938f0dc84d374ab052d5030020886451d47
PiperOrigin-RevId: 164965398
15 files changed
tree: 997d58e3a891c4f14d240aa13cb7d94d9d93d249
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. combine_distfiles.py
  13. combine_distfiles_to_tar.sh
  14. compile.sh
  15. CONTRIBUTING.md
  16. CONTRIBUTORS
  17. ISSUE_TEMPLATE.md
  18. LICENSE
  19. README.md
  20. WORKSPACE
README.md

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