Package org.apache.pekko.dispatch
Class Futures$
- java.lang.Object
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- org.apache.pekko.dispatch.Futures$
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public class Futures$ extends java.lang.Object
Futures is the Java API for Futures and Promises
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Constructor Summary
Constructors Constructor Description Futures$()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description <T> scala.concurrent.Future<T>
failed(java.lang.Throwable exception)
creates an already completed Promise with the specified exception<T> java.util.concurrent.CompletionStage<T>
failedCompletionStage(java.lang.Throwable ex)
Creates an already completed CompletionStage with the specified exception<T> scala.concurrent.Future<Option<T>>
find(java.lang.Iterable<scala.concurrent.Future<T>> futures, Function<T,java.lang.Boolean> predicate, scala.concurrent.ExecutionContext executor)
Returns a Future that will hold the optional result of the first Future with a result that matches the predicate<T> scala.concurrent.Future<T>
firstCompletedOf(java.lang.Iterable<scala.concurrent.Future<T>> futures, scala.concurrent.ExecutionContext executor)
Returns a Future to the result of the first future in the list that is completed<T,R>
scala.concurrent.Future<R>fold(R zero, java.lang.Iterable<scala.concurrent.Future<T>> futures, Function2<R,T,R> fun, scala.concurrent.ExecutionContext executor)
A non-blocking fold over the specified futures, with the start value of the given zero.<T> scala.concurrent.Future<T>
future(java.util.concurrent.Callable<T> body, scala.concurrent.ExecutionContext executor)
Starts an asynchronous computation and returns aFuture
object with the result of that computation.<T> scala.concurrent.Promise<T>
promise()
Creates a promise object which can be completed with a value.<T,R>
scala.concurrent.Future<R>reduce(java.lang.Iterable<scala.concurrent.Future<T>> futures, Function2<R,T,R> fun, scala.concurrent.ExecutionContext executor)
Reduces the results of the supplied futures and binary function.<A> scala.concurrent.Future<java.lang.Iterable<A>>
sequence(java.lang.Iterable<scala.concurrent.Future<A>> in, scala.concurrent.ExecutionContext executor)
<T> scala.concurrent.Future<T>
successful(T result)
Creates an already completed Promise with the specified result<A,B>
scala.concurrent.Future<java.lang.Iterable<B>>traverse(java.lang.Iterable<A> in, Function<A,scala.concurrent.Future<B>> fn, scala.concurrent.ExecutionContext executor)
Transforms a JIterable[A] into a Future[JIterable[B} using the provided Function A => Future[B].
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Field Detail
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MODULE$
public static final Futures$ MODULE$
Static reference to the singleton instance of this Scala object.
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Method Detail
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future
public <T> scala.concurrent.Future<T> future(java.util.concurrent.Callable<T> body, scala.concurrent.ExecutionContext executor)
Starts an asynchronous computation and returns aFuture
object with the result of that computation.The result becomes available once the asynchronous computation is completed.
- Parameters:
body
- the asynchronous computationexecutor
- the execution context on which the future is run- Returns:
- the
Future
holding the result of the computation
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promise
public <T> scala.concurrent.Promise<T> promise()
Creates a promise object which can be completed with a value.- Returns:
- the newly created
Promise
object
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failed
public <T> scala.concurrent.Future<T> failed(java.lang.Throwable exception)
creates an already completed Promise with the specified exception
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successful
public <T> scala.concurrent.Future<T> successful(T result)
Creates an already completed Promise with the specified result
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failedCompletionStage
public <T> java.util.concurrent.CompletionStage<T> failedCompletionStage(java.lang.Throwable ex)
Creates an already completed CompletionStage with the specified exception
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find
public <T> scala.concurrent.Future<Option<T>> find(java.lang.Iterable<scala.concurrent.Future<T>> futures, Function<T,java.lang.Boolean> predicate, scala.concurrent.ExecutionContext executor)
Returns a Future that will hold the optional result of the first Future with a result that matches the predicate
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firstCompletedOf
public <T> scala.concurrent.Future<T> firstCompletedOf(java.lang.Iterable<scala.concurrent.Future<T>> futures, scala.concurrent.ExecutionContext executor)
Returns a Future to the result of the first future in the list that is completed
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fold
public <T,R> scala.concurrent.Future<R> fold(R zero, java.lang.Iterable<scala.concurrent.Future<T>> futures, Function2<R,T,R> fun, scala.concurrent.ExecutionContext executor)
A non-blocking 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.
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reduce
public <T,R> scala.concurrent.Future<R> reduce(java.lang.Iterable<scala.concurrent.Future<T>> futures, Function2<R,T,R> fun, scala.concurrent.ExecutionContext executor)
Reduces the results of the supplied futures and binary function.
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sequence
public <A> scala.concurrent.Future<java.lang.Iterable<A>> sequence(java.lang.Iterable<scala.concurrent.Future<A>> in, scala.concurrent.ExecutionContext executor)
Simple version oftraverse(java.lang.Iterable<A>, org.apache.pekko.japi.Function<A, scala.concurrent.Future<B>>, scala.concurrent.ExecutionContext)
. Transforms a JIterable[Future[A} into a Future[JIterable[A}. Useful for reducing many Futures into a single Future.
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traverse
public <A,B> scala.concurrent.Future<java.lang.Iterable<B>> traverse(java.lang.Iterable<A> in, Function<A,scala.concurrent.Future<B>> fn, scala.concurrent.ExecutionContext executor)
Transforms a JIterable[A] into a Future[JIterable[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.
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