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117 lines
3.3 KiB
ReStructuredText
117 lines
3.3 KiB
ReStructuredText
1.x to 2.x
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==========
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:hackage:`dejafu-2.0.0.0` is a super-major release which breaks
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compatibility with :hackage:`dejafu-1.x <dejafu-1.12.0.0>`.
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Highlights reel:
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* Test cases are written in terms of a new ``Program`` type.
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* The ``Failure`` type has been replaced with a ``Condition`` type
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(actually in 1.12).
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* Random testing takes an optional length bound.
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* Atomically-checked invariants over shared mutable state.
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See the changelogs for the full details.
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The ``Program`` type
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--------------------
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The ``ConcT`` type is now an alias for ``Program Basic``.
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A ``Program Basic`` has all the instances ``ConcT`` did, defined using
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the ``~`` instance trick, so this shouldn't be a breaking change:
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.. code-block:: haskell
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instance (pty ~ Basic) => MonadTrans (Program pty)
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instance (pty ~ Basic) => MonadCatch (Program pty n)
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instance (pty ~ Basic) => MonadThrow (Program pty n)
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instance (pty ~ Basic) => MonadMask (Program pty n)
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instance (pty ~ Basic, Monad n) => MonadConc (Program pty n)
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instance (pty ~ Basic, MonadIO n) => MonadIO (Program pty n)
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The ``dontCheck`` function has been removed in favour of
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``withSetup``:
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.. code-block:: haskell
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do x <- dontCheck setup
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action x
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-- becomes
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withSetup setup action
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The ``subconcurrency`` function has been removed in favour of
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``withSetupAndTeardown``:
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.. code-block:: haskell
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do x <- setup
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y <- subconcurrency (action x)
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teardown x y
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-- becomes
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withSetupAndTeardown setup teardown action
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The ``dontCheck`` and ``subconcurrency`` functions used to throw
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runtime errors if nested. This is not possible with ``withSetup`` and
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``withSetupAndTeardown`` due to their types:
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.. code-block:: haskell
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withSetup
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:: Program Basic n x
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-- ^ Setup action
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-> (x -> Program Basic n a)
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-- ^ Main program
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-> Program (WithSetup x) n a
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withSetupAndTeardown
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:: Program Basic n x
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-- ^ Setup action
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-> (x -> Either Condition y -> Program Basic n a)
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-- ^ Teardown action
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-> (x -> Program Basic n y)
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-- ^ Main program
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-> Program (WithSetupAndTeardown x y) n a
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Previously, multiple calls to ``subconcurrency`` could be sequenced in
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the same test case. This is not possible using
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``withSetupAndTeardown``. If you rely on this behaviour, please
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:issue:`file an issue <>`.
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The ``Condition`` type
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----------------------
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This is a change in :hackage:`dejafu-1.12.0.0`, but the alias
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``Failure = Condition`` is removed in :hackage:`dejafu-2.0.0.0`.
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* The ``STMDeadlock`` and ``Deadlock`` constructors have been merged.
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* Internal errors have been split into the ``Error`` type and are
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raised as exceptions, instead of being returned as conditions.
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The name "failure" has been a recurring source of confusion, because
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an individual execution can "fail" without the predicate as a whole
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failing. My hope is that the more neutral "condition" will prevent
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this confusion.
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Deprecated functions
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--------------------
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All the deprecated special-purpose functions have been removed. Use
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more general ``*WithSettings`` functions instead.
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Need help?
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----------
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* For general help talk to me in IRC (barrucadu in #haskell) or shoot
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me an email (mike@barrucadu.co.uk)
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* For bugs, issues, or requests, please :issue:`file an issue <>`.
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