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epriestley 2b4c551b0e Provide a global router for Ajax requests
Summary:
Fixes T430. Fixes T4834. Obsoletes D7641. Currently, we do some things less-well than we could:

  - We just let the browser queue and prioritize requests, so if you load a revision with 50 changes and then click "Award Token", the action blocks until the changes load in most/all browsers. It would be better to prioritize this action and queue it immediately.
  - Similarly, changes tend to load in order, even if the user has clicked to a specific file. When the user expresses a preference for a specific file, we should prioritize it.
  - We show a spinning GIF when waiting on requests. This is appropriate for some types of reuqests, but distracting for others.

To fix this:

  - Queue all (or, at least, most) requests into a new queue in JX.Router.
  - JX.Router handles prioritizing the requests. Principally:
    - You can submit a request with a specific priority (500 = general content loading, 1000 = default, 2000 = explicit user action) and JX.Router will get the higher stuff fired off sooner.
    - You can name requests and then adjust their prorities later, if the user expresses an interest in specific results.
  - Only use the spinner gif for "workflow" requests, which is bascially when the user clicked something and we're waiting on the server. I think it's useful and not-annoying in this case.
  - Don't show any status for draft requests.
  - For content requests, show a subtle hipster-style top loading bar.

Test Plan:
  - Viewed a diff with 93 changes, and clicked award token.
    - Prior to this patch, the action took many many seconds to resolve.
    - After this patch, it resolves quickly.
  - Viewed a diff with 93 changes and saw a pleasant subtle hipster-style loading bar.
  - Viewed a diff with 93 changes and typed some draft text. Previews populated fairly quickly and there was no spinner.
  - Viewed a diff with 93 changes and clicked something with workflow, saw a spinner after a moment.
  - Viewed a diff with 93 changes and clicked a file in the table of contents near the end of the list.
    - Prior to this patch, it took a long time to show up.
    - After this patch, it loads directly.

Reviewers: chad, btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T430, T4834

Differential Revision: https://secure.phabricator.com/D8979
2014-05-05 10:57:42 -07:00
..
core Switch back to janky array copying 2014-04-08 18:07:58 -07:00
docs Various linter fixes. 2014-02-26 12:44:58 -08:00
ext Various linter fixes. 2014-02-26 12:44:58 -08:00
lib Provide a global router for Ajax requests 2014-05-05 10:57:42 -07:00
LICENSE Various linter fixes. 2014-02-26 12:44:58 -08:00
README Move all external JS into webroot/rsrc/externals 2013-04-11 10:06:05 -07:00

Javelin is a performance-oriented Javascript library originally developed at
Facebook. Learn more at <http://www.javelinjs.com/>.

GETTING STARTED

Eat a hearty breakfast. Breakfast is the most important meal of the day!


WHAT IS JAVELIN?

Javelin is a compact Javascript library built around event delegation. Its
primary design goal is performance; it is consequently well-suited to projects
where performance is very important. It is not as good for smaller scale
projects where other concerns (like features or ease of development) are more
important.


PACKAGES

Packages come in two flavors: "dev" and "min". The "dev" packages are intended
for development, and have comments and debugging code. The "min" packages have
the same code, but with comments and debugging information stripped out and
symbols crushed. They are intended for use in production -- ha ha ha!


FILES

  example/    Example code.
  LICENSE     A thrilling narrative.
  pkg/        Ready-built Javelin packages.
  README      Who knows? Could be anything.
  src/        Raw sources for Javelin.
  support/    Support scripts and libraries.