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haxl v2.0.0.0 Release Notes

Release Date: 2018-03-22 // about 6 years ago

    • Completely rewritten internals to support arbitrarily overlapping I/O and computation. Haxl no longer runs batches of I/O in "rounds", waiting for all the I/O to complete before resuming the computation. In Haxl 2, we can spawn I/O that returns results in the background and computation fragments are resumed when the values they depend on are available. See tests/FullyAsyncTest.hs for an example.

    • A new PerformFetch constructor supports the new concurrency features: BackgroundFetch. The data source is expected to call putResult in the background on each BlockedFetch when its result is ready.

    • There is a generic DataSource implementation in Haxl.DataSource.ConcurrentIO for performing each I/O operation in a separate thread.

    • Lots of cleanup and refactoring of the APIs.

    • License changed from BSD+PATENTS to plain BSD3.