Future companion object.
Future companion object.
- Companion
- class
Type members
Value members
Concrete methods
Starts an asynchronous computation and returns a Future instance with the result of that computation.
Starts an asynchronous computation and returns a Future instance with the result of that computation.
The following expressions are equivalent:
val f1 = Future(expr)
val f2 = Future.unit.map(_ => expr)
val f3 = Future.unit.transform(_ => Success(expr))The result becomes available once the asynchronous computation is completed.
- Type Params
- T
the type of the result
- Value Params
- body
the asynchronous computation
- executor
the execution context on which the future is run
- Returns
the
Futureholding the result of the computation
Starts an asynchronous computation and returns a Future instance with the result of that computation once it completes.
Starts an asynchronous computation and returns a Future instance with the result of that computation once it completes.
The following expressions are semantically equivalent:
val f1 = Future(expr).flatten
val f2 = Future.delegate(expr)
val f3 = Future.unit.flatMap(_ => expr)The result becomes available once the resulting Future of the asynchronous computation is completed.
- Type Params
- T
the type of the result
- Value Params
- body
the asynchronous computation, returning a Future
- executor
the execution context on which the
bodyis evaluated in
- Returns
the
Futureholding the result of the computation
Creates an already completed Future with the specified exception.
Creates an already completed Future with the specified exception.
- Type Params
- T
the type of the value in the future
- Value Params
- exception
the non-null instance of
Throwable
- Returns
the newly created
Futureinstance
Asynchronously and non-blockingly returns a Future that will hold the optional result
of the first Future with a result that matches the predicate, failed Futures will be ignored.
Asynchronously and non-blockingly returns a Future that will hold the optional result
of the first Future with a result that matches the predicate, failed Futures will be ignored.
- Type Params
- T
the type of the value in the future
- Value Params
- futures
the
scala.collection.immutable.Iterableof Futures to search- p
the predicate which indicates if it's a match
- Returns
the
Futureholding the optional result of the search
Asynchronously and non-blockingly returns a new Future to the result of the first future
in the list that is completed.
Asynchronously and non-blockingly returns a new Future to the result of the first future
in the list that is completed. This means no matter if it is completed as a success or as a failure.
- Type Params
- T
the type of the value in the future
- Value Params
- futures
the
IterableOnceof Futures in which to find the first completed
- Returns
the
Futureholding the result of the future that is first to be completed
A non-blocking, asynchronous left fold over the specified futures, with the start value of the given zero.
A non-blocking, asynchronous left fold over the specified futures, with the start value of the given zero. The fold is performed asynchronously in left-to-right order as the futures become completed. The result will be the first failure of any of the futures, or any failure in the actual fold, or the result of the fold.
Example:
val futureSum = Future.foldLeft(futures)(0)(_ + _)- Type Params
- R
the type of the value of the returned
Future- T
the type of the value of the input Futures
- Value Params
- futures
the
scala.collection.immutable.Iterableof Futures to be folded- op
the fold operation to be applied to the zero and futures
- zero
the start value of the fold
- Returns
the
Futureholding the result of the fold
Creates an already completed Future with the specified result or exception.
Creates an already completed Future with the specified result or exception.
- Type Params
- T
the type of the value in the
Future
- Value Params
- result
the result of the returned
Futureinstance
- Returns
the newly created
Futureinstance
Initiates a non-blocking, asynchronous, left reduction over the supplied futures
where the zero is the result value of the first Future.
Initiates a non-blocking, asynchronous, left reduction over the supplied futures
where the zero is the result value of the first Future.
Example:
val futureSum = Future.reduceLeft(futures)(_ + _)- Type Params
- R
the type of the value of the returned
Future- T
the type of the value of the input Futures
- Value Params
- futures
the
scala.collection.immutable.Iterableof Futures to be reduced- op
the reduce operation which is applied to the results of the futures
- Returns
the
Futureholding the result of the reduce
Simple version of Future.traverse.
Simple version of Future.traverse. Asynchronously and non-blockingly transforms, in essence, a IterableOnce[Future[A]]
into a Future[IterableOnce[A]]. Useful for reducing many Futures into a single Future.
- Type Params
- A
the type of the value inside the Futures
- CC
the type of the
IterableOnceof Futures- To
the type of the resulting collection
- Value Params
- in
the
IterableOnceof Futures which will be sequenced
- Returns
the
Futureof the resulting collection
Creates an already completed Future with the specified result.
Creates an already completed Future with the specified result.
- Type Params
- T
the type of the value in the future
- Value Params
- result
the given successful value
- Returns
the newly created
Futureinstance
Asynchronously and non-blockingly transforms a IterableOnce[A] into a Future[IterableOnce[B]]
using the provided function A => Future[B].
Asynchronously and non-blockingly transforms a IterableOnce[A] into a Future[IterableOnce[B]]
using the provided function A => Future[B].
This is useful for performing a parallel map. For example, to apply a function to all items of a list
in parallel:
val myFutureList = Future.traverse(myList)(x => Future(myFunc(x)))- Type Params
- A
the type of the value inside the Futures in the collection
- B
the type of the value of the returned
Future- M
the type of the collection of Futures
- Value Params
- fn
the function to be mapped over the collection to produce a collection of Futures
- in
the collection to be mapped over with the provided function to produce a collection of Futures that is then sequenced into a Future collection
- Returns
the
Futureof the collection of results
Deprecated methods
A non-blocking, asynchronous fold over the specified futures, with the start value of the given zero.
A non-blocking, asynchronous fold over the specified futures, with the start value of the given zero. The fold is performed on the thread where the last future is completed, the result will be the first failure of any of the futures, or any failure in the actual fold, or the result of the fold.
Example:
val futureSum = Future.fold(futures)(0)(_ + _)- Type Params
- R
the type of the value of the returned
Future- T
the type of the value of the input Futures
- Value Params
- futures
the
IterableOnceof Futures to be folded- op
the fold operation to be applied to the zero and futures
- zero
the start value of the fold
- Returns
the
Futureholding the result of the fold- Deprecated
Initiates a non-blocking, asynchronous, fold over the supplied futures
where the fold-zero is the result value of the first Future in the collection.
Initiates a non-blocking, asynchronous, fold over the supplied futures
where the fold-zero is the result value of the first Future in the collection.
Example:
val futureSum = Future.reduce(futures)(_ + _)- Type Params
- R
the type of the value of the returned
Future- T
the type of the value of the input Futures
- Value Params
- futures
the
IterableOnceof Futures to be reduced- op
the reduce operation which is applied to the results of the futures
- Returns
the
Futureholding the result of the reduce- Deprecated