final class AsyncVar[A] extends AnyRef
Asynchronous mutable location, that is either empty or contains
a value of type A.
It has 2 fundamental atomic operations:
- put which fills the var if empty, or blocks (asynchronously) otherwise until the var is empty again
- take which empties the var if full, returning the contained value, or blocks (asynchronously) otherwise until there is a value to pull
The AsyncVar is appropriate for building synchronization
primitives and performing simple inter-thread communications.
If it helps, it's similar with a BlockingQueue(capacity = 1),
except that it doesn't block any threads, all waiting being
callback-based.
Given its asynchronous, non-blocking nature, it can be used on top of Javascript as well.
Inspired by Control.Concurrent.MVar from Haskell.
- Source
- AsyncVar.scala
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def
put(a: A): Future[Unit]
Fills the
AsyncVarif it is empty, or blocks (asynchronously) if theAsyncVaris full, until the given value is next in line to be consumed on take.Fills the
AsyncVarif it is empty, or blocks (asynchronously) if theAsyncVaris full, until the given value is next in line to be consumed on take.This operation is atomic.
- returns
a future that will complete when the
putoperation succeeds in filling theAsyncVar, with the given value being next in line to be consumed
- See also
unsafePut for the raw, unsafe version that can work with plain callbacks.
-
def
read: Future[A]
Tries reading the current value, or blocks (asynchronously) otherwise, until there is a value available, at which point the operation resorts to a
takefollowed by aput.Tries reading the current value, or blocks (asynchronously) otherwise, until there is a value available, at which point the operation resorts to a
takefollowed by aput.This
readoperation is equivalent to:for (a <- v.take; _ <- v.put(a)) yield a
This operation is not atomic. Being equivalent with a
takefollowed by aput, in order to ensure that no race conditions happen, additional synchronization is necessary. See AsyncSemaphore for a possible solution.- returns
a future that might already be completed in case the result is available immediately
- See also
unsafeRead for the raw, unsafe version that can work with plain callbacks.
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def
synchronized[T0](arg0: ⇒ T0): T0
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def
take: Future[A]
Empties the var if full, returning the contained value, or blocks (asynchronously) until a value is available.
Empties the var if full, returning the contained value, or blocks (asynchronously) until a value is available.
This operation is atomic.
- See also
unsafeTake for the raw, unsafe version that can work with plain callbacks.
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def
unsafePut(a: A, await: Listener[Unit]): Boolean
Fills the
AsyncVarif it is empty, or blocks (asynchronously) if theAsyncVaris full, until the given value is next in line to be consumed on take (or unsafeTake).Fills the
AsyncVarif it is empty, or blocks (asynchronously) if theAsyncVaris full, until the given value is next in line to be consumed on take (or unsafeTake).This operation is atomic.
- a
is the value to store
- await
is a callback that, only in case of asynchronous blocking, will get called when the blocking is over and the operation succeeded
- returns
trueif the operation succeeded already, with no blocking necessary, orfalseif the operation is blocked because the var is already full
- Annotations
- @tailrec()
- See also
put for the safe future-enabled version.
-
def
unsafeRead(await: Listener[A]): A
Tries reading the current value, or blocks (asynchronously) otherwise, until there is a value available, at which point the operation resorts to a
takefollowed by aput.Tries reading the current value, or blocks (asynchronously) otherwise, until there is a value available, at which point the operation resorts to a
takefollowed by aput.This
readoperation is equivalent to:for (a <- v.take; _ <- v.put(a)) yield a
This operation is not atomic. Being equivalent with a
takefollowed by aput, in order to ensure that no race conditions happen, additional synchronization is necessary. See AsyncSemaphore for a possible solution.- await
is a callback that, only in case of asynchronous blocking, will get called sometime in the future with a value
- returns
a value of type
Aif the operation succeeded already, with no blocking necessary, ornullif async blocking is in progress (in which case theawaitcallback gets called with the result)
- See also
read for the safe future-enabled version.
-
def
unsafeTake(await: Listener[A]): A
Empties the var if full, returning the contained value, or blocks (asynchronously) until a value is available.
Empties the var if full, returning the contained value, or blocks (asynchronously) until a value is available.
This operation is atomic.
- await
is a callback that, only in case of asynchronous blocking, will get called sometime in the future with a value
- returns
a value of type
Aif the operation succeeded already, with no blocking necessary, ornullif async blocking is in progress (in which case theawaitcallback gets called with the result)
- Annotations
- @tailrec()
- See also
take for the safe future-enabled version.
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This is the API documentation for the Monix library.
Package Overview
monix.execution exposes lower level primitives for dealing with asynchronous execution:
Atomictypes, as alternative tojava.util.concurrent.atomicmonix.eval is for dealing with evaluation of results, thus exposing Task and Coeval.
monix.reactive exposes the
Observablepattern:Observableimplementationsmonix.types implements type-class shims, to be translated to type-classes provided by libraries such as Cats or Scalaz.
monix.cats is the optional integration with the Cats library, providing translations for the types described in
monix.types.monix.scalaz is the optional integration with the Scalaz library, providing translations for the types described in
monix.types.