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Change all data transfer to occur through FileDescriptors instead of
relying on local files. This paves the way for downloading directly
to content:// Uris in the future.
Rewrite storage management logic to preflight download when size is
known. If enough space is found, immediately reserve the space with
fallocate(), advising the kernel block allocator to try giving us a
contiguous block regions to reduce fragmentation. When preflighting
on internal storage or emulated external storage, ask PackageManager
to clear private app caches to free up space.
Since we fallocate() the entire file, use the database as the source
of truth for resume locations, which requires that we fsync() before
each database update.
Store in-progress downloads in separate directories to keep the OS
from deleting out from under us. Clean up filename generation logic
to break ties in this new dual-directory case.
Clearer enforcement of successful download preconditions around
content lengths and ETags. Move all database field mutations to
clearer DownloadInfoDelta object, and write back through single
code path.
Catch and log uncaught exceptions from DownloadThread. Tests to
verify new storage behaviors. Fixed existing test to reflect correct
RFC behavior.
Bug: 5287571, 3213677, 12663412
Change-Id: I6bb905eca7c7d1a6bc88df3db28b65d70f660221
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This "Large" test sets up an HTTP server on the device using
MockWebServer and then initiates downloads from that server through
the download manager. It uses ServiceTestCase to control the
construction and execution of the DownloadService, and it uses some
logic from ProviderTestCase2 to construct a DownloadProvider and a
ContentResolver that uses it.
This setup gives us some ability to mock dependencies. This commit
includes use of a fake ConnectivityManager to test responses to
connectivity changes, and use of some customizations to MockWebServer
to test resuming an interrupted download. This test is disabled,
though, since it requires a very long sleep.
Avoiding that, and achieving certain other things, will require
changes to the Download Manager code itself to introduce new seams. I
wanted to check this in before I started such changes.
Change-Id: Iefb13b3c3cccdc13fabe5cc18703e13244805539
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