Start to implement a worker to replace SyncrhonizationService

Description

Replace SynchronizatioNService by a long running worker: SyncWorker

Screenshots

Technical details

• Use a Unique OneTime WorkRequest (SyncWorker) to replace SynchronizationService.
• The SyncWorker trigger a notification to be able to run for more than 10 minutes. The notification does no sound. It display number of syncRequest submitted.
• Upload, Download & Disable file sync on delete are executed synchronously with a SyncTask class (implementing Runnable): No more Listener.
• SyncTask is run Asynchronously in SyncWorker thanks to a FixedThreadPoolExecutor with 2 thread.
• update class package's organization a little (moving operation package to synchronization/syncTasks

Note: One point I dislike with Sync task : all the request queued are submit to the FixedThreadPoolExecutor at the same time. They are not polled one by one. But they're still executed on 2 thread like before.

to Reviewer:

• Please check and help about "LateInit var". I'm not use to this keyword and I'm sure there is things to correct/improve in implementation
• Sorry for the commit history. I had difficulties to find and implement a working solution for this issue.

Tests

• Sync Worker run longer than 10 minutes (10 minutes is the limit for classical worker)
• Sync Big files
• Cut network connection and check that it can restart later
• Download file
• Upload file
• Disable File sync (on file delete)
• Run without persistent flag
• Sync is stopped when an account is removed

Maximum number of files synchronized in a single worker's run: 35 (various size)

Issues

https://gitlab.e.foundation/e/os/backlog/-/work_items/1699

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