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epriestley 27ce691839 Fix an issue with the Herald engine field value cache 
Summary:
To improve the performance of Herald, we attempt to generate the value for each field (e.g., a task title) only once.

For most field values this is cheap, but for some (like a commit's branches) it can be quite expensive. We only want to pay this cost once, so we cache field values.

However, D12957 accidentally added a check where we bypass the cache and generate the value for every field, before reading the cache. This causes us to generate each field for every rule that uses it, plus one extra time.

Instead, use the cache for this check, too. Also allow the cache to cache `null`, since it can be expensive to generate `null` even though the value isn't too interesting.

The value of this early hit isn't even used (we only care if it throws or not).

Test Plan:
  - Wrote a rule like "if any condition matches: branches contain a, branches contain b, branches contain c".
  - Put `phlog(new Exception())` in `DiffusionCommitBranchesHeraldField`.
  - Before patch, saw `bin/repository reparse --herald <any commit>` compute branches three times.
  - After patch, saw only one computation.
  - Verified field values in the transcript view

Reviewers: chad

Reviewed By: chad

Differential Revision: https://secure.phabricator.com/D15451
2016-03-09 10:28:50 -08:00
bin Provide bin/nuance import and ngram indexes for sources 2016-03-08 10:30:24 -08:00
conf Mark some strings for translation 2015-06-09 23:06:52 +10:00
externals Swap S3 to first-party client 2016-01-10 07:55:27 -08:00
resources Polish up timeline for PHIUTwoColumnView 2016-03-08 17:51:53 -08:00
scripts Provide bin/nuance import and ngram indexes for sources 2016-03-08 10:30:24 -08:00
src Fix an issue with the Herald engine field value cache 2016-03-09 10:28:50 -08:00
support Fix HTTP body decompression in PHP 5.6 2016-02-20 14:55:05 -08:00
webroot Polish up timeline for PHIUTwoColumnView 2016-03-08 17:51:53 -08:00
.arcconfig Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.arclint Begin adding test coverage to GitHub Events API parsers 2016-03-09 09:30:07 -08:00
.arcunit Use the configuration driven unit test engine 2015-08-11 07:57:11 +10:00
.editorconfig Fix text lint issues 2015-02-12 07:00:13 +11:00
.gitignore Add custom Cows and Figlet directories to .gitignore 2015-10-08 20:23:05 -07:00
LICENSE Fix text lint issues 2015-02-12 07:00:13 +11:00
NOTICE Update Phabricator NOTICE file to reflect modern legal circumstances 2014-06-25 13:42:13 -07:00
README.md Remove push to IRC from "readme.md" too 2015-10-24 18:39:16 -07:00

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