# Changes in version * Added fetchBatchId to FetchStats * Profiling now tracks full stacks and links each label to memos/fetches # Changes in version 2.3.0.0 * Removed `FutureFetch` # Changes in version 2.2.0.0 * Use BasicHashTable for the Haxl DataCache instead of HashMap * API Changes in: Haxl.Core.DataCache, Haxl.Core.Fetch * Removed support for GHC < 8.2 # Changes in version 2.1.2.0 * Add a callgraph reference to 'Env' to record the function callgraph during a computation. The callgraph is stored as an edge list in the Env through the use of `withCallGraph` and enables users to debug a Haxl computation. # Changes in version 2.1.1.0 * Adds feature to track outgone datasource fetches. This is only turned on for report level greater than 1. The fetches are stored as a running Map in the env ('submittedReqsRef'). # Changes in version 2.1.0.0 * Add a new 'w' parameter to 'GenHaxl' to allow arbitrary writes during a computation. These writes are stored as a running log in the Env, and are memoized. This allows users to extract information from a Haxl computation which throws. Our advise is to limit these writes to monitoring and debugging logs. * A 'WriteTree' constructor to maintain log of writes inside the Environment. This is defined to allow O(1) mappend. # Changes in version 2.0.1.1 * Support for GHC 8.6.1 * Bugfixes # Changes in version 2.0.1.0 * Exported MemoVar from Haxl.Core.Memo * Updated the facebook example * Fixed some links in the documentation * Bump some version bounds # Changes in version 2.0.0.0 * 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. # Changes in version 0.5.1.0 * 'pAnd' and 'pOr' were added * 'asyncFetchAcquireRelease' was added * 'cacheResultWithShow' was exposed * GHC 8.2.1 compatibility # Changes in version 0.5.0.0 * Rename 'Show1' to 'ShowP' ([#62](https://github.com/facebook/Haxl/issues/62)) # Changes in version 0.3.0.0 * Some performance improvements, including avoiding quadratic slowdown with left-associated binds. * Documentation cleanup; Haxl.Core is the single entry point for the core and engine docs. * (>>) is now defined to be (*>), and therefore no longer forces sequencing. This can have surprising consequences if you are using Haxl with side-effecting data sources, so watch out! * New function withEnv, for running a sub-computation in a local Env * Add a higher-level memoization API, see 'memo' * Show is no longer required for keys in cachedComputation * Exceptions now have `Eq` instances