touch-packages team mailing list archive

[Michi Henning <michi.henning@xxxxxxxxxxxxx>]

Fixed. The backlog of 20 was too large, meaning that the UI could never
cancel requests quickly enough to actually be still in the queue
because, each time we dropped back to the event loop, we'd fire another
request. That turned all the cancel messages effectively into no-ops.

I also changed the rate limiter to use LIFO instead of FIFO. This gives
a cancel message a much better chance of still finding a request waiting
in the queue, so it can really be cancelled. This massively improves the
user experience with a cold cache when scrolling through a large
collection of songs because the requests that become visible once
scrolling stops are dealt with first. (Previously, the thumbnails for
songs visible at the end of the scroll would appear only once all
preceding thumbnails (now no longer visible) had been dealt with.)

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Touch seeded packages, which is subscribed to thumbnailer in Ubuntu.
https://bugs.launchpad.net/bugs/1531038

Title:
  Cancellation happens too late

Status in thumbnailer package in Ubuntu:
  New

Bug description:
  I'm still not happy with cancellation. The thumbnailer handles
  cancellation correctly, that is, successfully cancels anything that
  hasn't been sent via dbus yet. But it doesn't work well at the UI
  level. When thumbnailing a large collection of MP3s without artwork
  and scrolling forward quickly, the requests that are scrolling off the
  top of the screen are not physically cancelled, so it takes a long
  time for the thumbnails for the visible section of the list to show
  up. In addition, more often than not, the application times out and
  shows "no artwork" images.

  Ideally, I'd like to see whatever is in the currently visible section
  to get priority.

  Need to investigate what exactly is going on here and whether there
  might be a way to mitigate the issue.

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