Bracket
Related Docs:
object Bracket
| package effect
A generalized version of bracket which uses ExitCase to distinguish between different exit cases when releasing the acquired resource.
A generalized version of bracket which uses ExitCase to distinguish between different exit cases when releasing the acquired resource.
is an action that "acquires" some expensive resource, that needs to be used and then discarded
is the action that uses the newly allocated resource and that will provide the final result
is the action that's supposed to release the
allocated resource after use is done, by observing
and acting on its exit condition
Operation meant for specifying tasks with safe resource acquisition and release in the face of errors and interruption.
Operation meant for specifying tasks with safe resource acquisition and release in the face of errors and interruption.
This operation provides the equivalent of try/catch/finally
statements in mainstream imperative languages for resource
acquisition and release.
is an action that "acquires" some expensive resource, that needs to be used and then discarded
is the action that uses the newly allocated resource and that will provide the final result
is the action that's supposed to release the
allocated resource after use is done, irregardless of
its exit condition
Executes the given finalizer when the source is finished,
either in success or in error, or if canceled.
Executes the given finalizer when the source is finished,
either in success or in error, or if canceled.
This variant of guaranteeCase evaluates the given finalizer
regardless of how the source gets terminated:
This equivalence always holds:
F.guarantee(fa)(f) <-> F.bracket(F.unit)(_ => fa)(_ => f)
As best practice, it's not a good idea to release resources
via guaranteeCase in polymorphic code. Prefer bracket
for the acquisition and release of resources.
bracket for the more general operation
guaranteeCase for the version that can discriminate between termination conditions
Executes the given finalizer when the source is finished,
either in success or in error, or if canceled, allowing
for differentiating between exit conditions.
Executes the given finalizer when the source is finished,
either in success or in error, or if canceled, allowing
for differentiating between exit conditions.
This variant of guarantee injects an ExitCase in the provided function, allowing one to make a difference between:
This equivalence always holds:
F.guaranteeCase(fa)(f) <-> F.bracketCase(F.unit)(_ => fa)((_, e) => f(e))
As best practice, it's not a good idea to release resources
via guaranteeCase in polymorphic code. Prefer bracketCase
for the acquisition and release of resources.
bracketCase for the more general operation
guarantee for the simpler version
Operation meant for ensuring a given task continues execution even when interrupted.
(Since version 1.0.0-RC2) Use *> or productR instead.
(Since version 1.0.0-RC2) Use productREval instead.
(Since version 1.0.0-RC2) Use <* or productL instead.
(Since version 1.0.0-RC2) Use productLEval instead.
An extension of
MonadErrorexposing thebracketoperation, a generalized abstracted pattern of safe resource acquisition and release in the face of errors or interruption.