ZManaged
Related Docs:
object ZManaged
| package zio
The ZIO value that underlies this ZManaged value.
The ZIO value that underlies this ZManaged value. To evaluate it, a ReleaseMap is required. The ZIO value will return a tuple of the resource allocated by this ZManaged and a finalizer that will release the resource.
Note that this method is a low-level interface, not intended for regular usage. As such, it offers no guarantees on interruption or resource safety - those are up to the caller to enforce!
A symbolic alias for orDie.
Symbolic alias for zip.
Symbolic alias for zipParRight
Splits the environment, providing the first part to this effect and the second part to that effect.
Symbolic alias for zipRight
Symbolic alias for zipParLeft
Symbolic alias for zipPar
Symbolic alias for zipLeft.
Symbolic alias for zip.
Symbolic alias for compose
Operator alias for orElse.
Symbolic alias for flatMap
Symbolic alias for andThen
Submerges the error case of an Either into the ZManaged.
Submerges the error case of an Either into the ZManaged. The inverse
operation of ZManaged.either.
Attempts to convert defects into a failure, throwing away all information about the cause of the failure.
Attempts to convert defects into a failure, throwing away all information about the cause of the failure.
Executes the this effect and then provides its output as an environment to the second effect
Maps this effect to the specified constant while preserving the effects of this effect.
Maps the success value of this effect to a service.
Maps the success value of this effect to an optional value.
Maps the error value of this effect to an optional value.
Returns an effect whose failure and success channels have been mapped by
the specified pair of functions, f and g.
Recovers from all errors.
Recovers from all errors with provided Cause.
Recovers from all errors with provided Cause.
managed.catchAllCause(_ => ZManaged.succeed(defaultConfig))absorb, sandbox, mapErrorCause - other functions that can recover from defects
Recovers from some or all of the error cases.
Recovers from some or all of the error Causes.
Fail with e if the supplied PartialFunction does not match, otherwise
succeed with the returned value.
Fail with e if the supplied PartialFunction does not match, otherwise
continue with the returned value.
Executes the second effect and then provides its output as an environment to this effect
Returns an effect whose failure and success have been lifted into an
Either.The resulting effect cannot fail
Ensures that f is executed when this ZManaged is finalized, after
the existing finalizer.
Ensures that f is executed when this ZManaged is finalized, after
the existing finalizer.
For usecases that need access to the ZManaged's result, see ZManaged#onExit.
Ensures that f is executed when this ZManaged is finalized, before
the existing finalizer.
Ensures that f is executed when this ZManaged is finalized, before
the existing finalizer.
For usecases that need access to the ZManaged's result, see ZManaged#onExitFirst.
Returns a ZManaged that ignores errors raised by the acquire effect and runs it repeatedly until it eventually succeeds.
Zips this effect with its environment
Returns a managed resource that attempts to acquire this managed resource and in case of failure, attempts to acquire each of the specified managed resources in order until one of them is successfully acquired, ensuring that the acquired resource is properly released after being used.
Returns an effect that models the execution of this effect, followed by
the passing of its value to the specified continuation function k,
followed by the effect that it returns.
Effectfully map the error channel
Returns an effect that performs the outer effect first, followed by the inner effect, yielding the value of the inner effect.
Returns an effect that performs the outer effect first, followed by the inner effect, yielding the value of the inner effect.
This method can be used to "flatten" nested effects.
Returns an effect that performs the outer effect first, followed by the inner effect, yielding the value of the inner effect.
Returns an effect that performs the outer effect first, followed by the inner effect, yielding the value of the inner effect.
This method can be used to "flatten" nested effects.
Flip the error and result
Flip the error and result, then apply an effectful function to the effect
Folds over the failure value or the success value to yield an effect that
does not fail, but succeeds with the value returned by the left or right
function passed to fold.
A more powerful version of fold that allows recovering from any kind of failure except interruptions.
A more powerful version of foldM that allows recovering from any kind of failure except interruptions.
Recovers from errors by accepting one effect to execute for the case of an error, and one effect to execute for the case of success.
Creates a ZManaged value that acquires the original resource in a fiber,
and provides that fiber.
Creates a ZManaged value that acquires the original resource in a fiber,
and provides that fiber. The finalizer for this value will interrupt the fiber
and run the original finalizer.
Unwraps the optional success of this effect, but can fail with None value.
Returns a new effect that ignores the success or failure of this effect.
Returns whether this managed effect is a failure.
Returns whether this managed effect is a success.
Depending on the environment execute this or the other effect
Locks this managed effect to the specified executor, guaranteeing that this managed effect as well as managed effects that are composed sequentially after it will be run on the specified executor.
Returns an effect whose success is mapped by the specified f function.
Returns an effect whose success is mapped by the specified side effecting
f function, translating any thrown exceptions into typed failed effects.
Returns an effect whose failure is mapped by the specified f function.
Returns an effect whose full failure is mapped by the specified f function.
Effectfully maps the resource acquired by this value.
Returns a new effect where the error channel has been merged into the success channel to their common combined type.
Requires the option produced by this value to be None.
Runs this managed effect, as well as any managed effects that are composed
sequentially after it, using the specified ExecutionContext.
Ensures that a cleanup function runs when this ZManaged is finalized, after the existing finalizers.
Ensures that a cleanup function runs when this ZManaged is finalized, before the existing finalizers.
Executes this effect, skipping the error but returning optionally the success.
Converts an option on errors into an option on values.
Translates effect failure into death of the fiber, making all failures unchecked and not a part of the type of the effect.
Keeps none of the errors, and terminates the fiber with them, using
the specified function to convert the E into a Throwable.
Executes this effect and returns its value, if it succeeds, but otherwise executes the specified effect.
Returns an effect that will produce the value of this effect, unless it fails, in which case, it will produce the value of the specified effect.
Executes this effect and returns its value, if it succeeds, but otherwise fails with the specified error.
Returns an effect that will produce the value of this effect, unless it
fails with the None value, in which case it will produce the value of
the specified effect.
Executes this effect and returns its value, if it succeeds, but otherwise succeeds with the specified value.
Preallocates the managed resource, resulting in a ZManaged that reserves and acquires immediately and cannot fail.
Preallocates the managed resource, resulting in a ZManaged that reserves and acquires immediately and cannot fail. You should take care that you are not interrupted between running preallocate and actually acquiring the resource as you might leak otherwise.
Preallocates the managed resource inside an outer managed, resulting in a ZManaged that reserves and acquires immediately and cannot fail.
Provides the ZManaged effect with its required environment, which eliminates
its dependency on R.
Provides the part of the environment that is not part of the ZEnv,
leaving a managed effect that only depends on the ZEnv.
Provides the part of the environment that is not part of the ZEnv,
leaving a managed effect that only depends on the ZEnv.
val loggingLayer: ZLayer[Any, Nothing, Logging] = ??? val managed: ZManaged[ZEnv with Logging, Nothing, Unit] = ??? val managed2 = managed.provideCustomLayer(loggingLayer)
Provides a layer to the ZManaged, which translates it to another level.
Provides some of the environment required to run this effect,
leaving the remainder R0.
Provides some of the environment required to run this effect,
leaving the remainder R0.
val managed: ZManaged[Console with Logging, Nothing, Unit] = ??? managed.provideSome[Console](env => new Console with Logging { val console = env.console val logging = new Logging.Service[Any] { def log(line: String) = console.putStrLn(line) } } )
Splits the environment into two parts, providing one part using the
specified layer and leaving the remainder R0.
Splits the environment into two parts, providing one part using the
specified layer and leaving the remainder R0.
val clockLayer: ZLayer[Any, Nothing, Clock] = ??? val managed: ZManaged[Clock with Random, Nothing, Unit] = ??? val managed2 = managed.provideSomeLayer[Random](clockLayer)
Keeps some of the errors, and terminates the fiber with the rest.
Keeps some of the errors, and terminates the fiber with the rest, using
the specified function to convert the E into a Throwable.
Fail with the returned value if the PartialFunction matches, otherwise
continue with our held value.
Continue with the returned computation if the PartialFunction matches,
translating the successful match into a failure, otherwise continue with
our held value.
Runs all the finalizers associated with this scope.
Runs all the finalizers associated with this scope. This is useful to conceptually "close" a scope when composing multiple managed effects. Note that this is only safe if the result of this managed effect is valid outside its scope.
Returns a Reservation that allows separately accessing effects
describing resource acquisition and release.
Retries with the specified retry policy.
Retries with the specified retry policy.
Retries are done following the failure of the original io (up to a fixed maximum with
once or recurs for example), so that that io.retry(Schedule.once) means
"execute io and in case of failure, try again once".
Returns an effect that semantically runs the effect on a fiber, producing an zio.Exit for the completion value of the fiber.
Exposes the full cause of failure of this effect.
Companion helper to sandbox.
Companion helper to sandbox. Allows recovery, and partial recovery, from
errors and defects alike.
Zips this effect with its environment
Converts an option on values into an option on errors.
Extracts the optional value, or returns the given 'default'.
Extracts the optional value, or executes the effect 'default'.
Extracts the optional value, or fails with the given error 'e'.
Extracts the optional value, or fails with a java.util.NoSuchElementException
Returns an effect that effectfully peeks at the acquired resource.
Returns an effect that effectfully peeks at the failure or success of the acquired resource.
Returns an effect that effectually peeks at the cause of the failure of the acquired resource.
Returns an effect that effectfully peeks at the failure of the acquired resource.
Like ZManaged#tap, but uses a function that returns a ZIO value rather than a ZManaged value.
Returns a new effect that executes this one and times the acquisition of the resource.
Returns an effect that will timeout this resource, returning None if the
timeout elapses before the resource was reserved and acquired.
Returns an effect that will timeout this resource, returning None if the
timeout elapses before the resource was reserved and acquired.
If the reservation completes successfully (even after the timeout) the release action will be run on a new fiber.
Some will be returned if acquisition and reservation complete in time
Constructs a layer from this managed resource.
Constructs a layer from this managed resource, which must return one or more services.
Return unit while running the effect
The moral equivalent of if (!p) exp
The moral equivalent of if (!p) exp when p has side-effects
The inverse operation ZManaged.sandboxed
Updates a service in the environment of this effect.
Run an effect while acquiring the resource before and releasing it after
Use the resource until interruption.
Use the resource until interruption. Useful for resources that you want to acquire and use as long as the application is running, like a HTTP server.
Runs the acquire and release actions and returns the result of this managed effect.
Runs the acquire and release actions and returns the result of this managed effect. Note that this is only safe if the result of this managed effect is valid outside its scope.
Run an effect while acquiring the resource before and releasing it after.
Run an effect while acquiring the resource before and releasing it after. This does not provide the resource to the function
The moral equivalent of if (p) exp
The moral equivalent of if (p) exp when p has side-effects
Modifies this ZManaged to provide a canceler that can be used to eagerly
execute the finalizer of this ZManaged.
Modifies this ZManaged to provide a canceler that can be used to eagerly
execute the finalizer of this ZManaged. The canceler will run
uninterruptibly with an exit value indicating that the effect was
interrupted, and if completed will cause the regular finalizer to not run.
A more powerful version of withEarlyRelease that allows specifying an exit value in the event of early release.
Named alias for <*>.
Named alias for <*.
Named alias for <&>.
Named alias for <&.
Named alias for &>.
Named alias for *>.
Returns an effect that executes both this effect and the specified effect,
in sequence, combining their results with the specified f function.
Returns an effect that executes both this effect and the specified effect,
in parallel, combining their results with the specified f function.
Returns an effect that executes both this effect and the specified effect,
in parallel, combining their results with the specified f function. If
either side fails, then the other side will be interrupted.
Symbolic alias for join
A
ZManaged[R, E, A]is a managed resource of typeA, which may be used by invoking theusemethod of the resource. The resource will be automatically acquired before the resource is used, and automatically released after the resource is used.Resources do not survive the scope of
use, meaning that if you attempt to capture the resource, leak it fromuse, and then use it after the resource has been consumed, the resource will not be valid anymore and may fail with some checked error, as per the type of the functions provided by the resource.