Future
Related Docs:
trait Future
| package concurrent
Test two objects for inequality.
Test two objects for inequality.
true if !(this == that), false otherwise.
Equivalent to x.hashCode except for boxed numeric types and null.
Equivalent to x.hashCode except for boxed numeric types and null.
For numerics, it returns a hash value which is consistent
with value equality: if two value type instances compare
as true, then ## will produce the same hash value for each
of them.
For null returns a hashcode where null.hashCode throws a
NullPointerException.
a hash value consistent with ==
The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).
The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).
true if the receiver object is equivalent to the argument; false otherwise.
Starts an asynchronous computation and returns a Future object with the result of that computation.
Starts an asynchronous computation and returns a Future object with the result of that computation.
The result becomes available once the asynchronous computation is completed.
the type of the result
the asynchronous computation
the execution context on which the future is run
the Future holding the result of the computation
Cast the receiver object to be of type T0.
Cast the receiver object to be of type T0.
Note that the success of a cast at runtime is modulo Scala's erasure semantics.
Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at
runtime, while the expression List(1).asInstanceOf[List[String]] will not.
In the latter example, because the type argument is erased as part of compilation it is
not possible to check whether the contents of the list are of the requested type.
the receiver object.
ClassCastException if the receiver object is not an instance of the erasure of type T0.
Create a copy of the receiver object.
Tests whether the argument (that) is a reference to the receiver object (this).
Tests whether the argument (that) is a reference to the receiver object (this).
The eq method implements an equivalence relation on
non-null instances of AnyRef, and has three additional properties:
x and y of type AnyRef, multiple invocations of
x.eq(y) consistently returns true or consistently returns false.x of type AnyRef, x.eq(null) and null.eq(x) returns false.null.eq(null) returns true. When overriding the equals or hashCode methods, it is important to ensure that their behavior is
consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they
should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).
true if the argument is a reference to the receiver object; false otherwise.
The equality method for reference types.
Creates an already completed Future with the specified exception.
Creates an already completed Future with the specified exception.
the type of the value in the future
the newly created Future object
Called by the garbage collector on the receiver object when there are no more references to the object.
Called by the garbage collector on the receiver object when there are no more references to the object.
The details of when and if the finalize method is invoked, as
well as the interaction between finalize and non-local returns
and exceptions, are all platform dependent.
Returns a Future that will hold the optional result of the first Future with a result that matches the predicate.
Returns a new Future to the result of the first future in the list that is completed.
A non-blocking fold over the specified futures, with the start value of the given zero.
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.
Example:
val result = Await.result(Future.fold(futures)(0)(_ + _), 5 seconds)
Creates an already completed Future with the specified result or exception.
Creates an already completed Future with the specified result or exception.
the type of the value in the promise
the newly created Future object
A representation that corresponds to the dynamic class of the receiver object.
A representation that corresponds to the dynamic class of the receiver object.
The nature of the representation is platform dependent.
a representation that corresponds to the dynamic class of the receiver object.
not specified by SLS as a member of AnyRef
The hashCode method for reference types.
Test whether the dynamic type of the receiver object is T0.
Test whether the dynamic type of the receiver object is T0.
Note that the result of the test is modulo Scala's erasure semantics.
Therefore the expression 1.isInstanceOf[String] will return false, while the
expression List(1).isInstanceOf[List[String]] will return true.
In the latter example, because the type argument is erased as part of compilation it is
not possible to check whether the contents of the list are of the specified type.
true if the receiver object is an instance of erasure of type T0; false otherwise.
Equivalent to !(this eq that).
Equivalent to !(this eq that).
true if the argument is not a reference to the receiver object; false otherwise.
Wakes up a single thread that is waiting on the receiver object's monitor.
Wakes up a single thread that is waiting on the receiver object's monitor.
not specified by SLS as a member of AnyRef
Wakes up all threads that are waiting on the receiver object's monitor.
Wakes up all threads that are waiting on the receiver object's monitor.
not specified by SLS as a member of AnyRef
Initiates a fold over the supplied futures where the fold-zero is the result value of the Future that's completed first.
Initiates a fold over the supplied futures where the fold-zero is the result value of the Future that's completed first.
Example:
val result = Await.result(Future.reduce(futures)(_ + _), 5 seconds)
Simple version of Future.traverse.
Simple version of Future.traverse. Transforms a TraversableOnce[Future[A]] into a Future[TraversableOnce[A]].
Useful for reducing many Futures into a single Future.
Creates an already completed Future with the specified result.
Creates an already completed Future with the specified result.
the type of the value in the future
the newly created Future object
Creates a String representation of this object.
Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.
a String representation of the object.
Transforms a TraversableOnce[A] into a Future[TraversableOnce[B]] using the provided function A => Future[B].
Transforms a TraversableOnce[A] into a Future[TraversableOnce[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)))
Future companion object.