async

Type Members

1. abstract class Callback[-T] extends AnyRef

   

   Represents a callback that should be called asynchronously with the result of a computation.

   Represents a callback that should be called asynchronously with the result of a computation. Used by Task to signal the completion of asynchronous computations on runAsync.

   The onSuccess method should be called only once, with the successful result, whereas onError should be called if the result is an error.

2. sealed abstract class Task[+A] extends AnyRef

   

   Task represents a specification for an asynchronous computation, which when executed will produce an A as a result, along with possible side-effects.

   Task represents a specification for an asynchronous computation, which when executed will produce an A as a result, along with possible side-effects.

   Compared with Future from Scala's standard library, Task does not represent a running computation or a value detached from time, as Task does not execute anything when working with its builders or operators and it does not submit any work into any thread-pool, the execution eventually taking place only after runAsync is called and not before that.

   Note that Task is conservative in how it spawns logical threads. Transformations like map and flatMap for example will default to being executed on the logical thread on which the asynchronous computation was started. But one shouldn't make assumptions about how things will end up executed, as ultimately it is the implementation's job to decide on the best execution model. All you are guaranteed is asynchronous execution after executing runAsync.