Arvados

I haven't quite figured out how it works yet, but new files do appear in the Files tab. It doesn't reload the whole tab; instead it's a little more targeted (Websockets?). But they definitely appear after a few moments, even if you previously loaded the Files tab before uploading.

• At the end of the upload process, there's a collections.update API call
• The update causes a Log
• Postgres notifies websocket server threads about the Log
• Websocket server sends Log to browser
• event_log.js sends event to Files tab because it has .arv-log-event-listener[data-object-uuid={collection-uuid}]
• tab_panes.js either reloads the tab, or sets a timer to reload the tab (depending on time since last load)

Brett pointed out that the bug could have been produced by a race condition:

1. Initiate tab refresh
2. Workbench prepares current tab content
3. Collection gets modified, websocket event arrives. Refresh is underway so the event is ignored.
4. Tab content arrives via AJAX
5. Tab "loaded" time is set to now, no update request is pending, tab content stays stale.

We should make sure this sort of sequence is handled correctly.