task
Related Doc:
package domains
The asynchronous task that supports exception handling, resource management, and is stack-safe.
The asynchronous task that supports exception handling, resource management, and is stack-safe.
A Task can be created from for-comprehension,
where keywords.Each and keywords.Fork can be used together to asynchronously iterate collections.
For example, the above concatenateRemoteData downloads and concatenates data from multiple URLs.
import com.thoughtworks.dsl.comprehension._ import com.thoughtworks.dsl.keywords._ import com.thoughtworks.dsl.keywords.Shift._ import com.thoughtworks.dsl.domains.task.Task import java.net.URL def concatenateRemoteData(urls: List[URL], downloader: URL => Task[Vector[Byte]]): Task[Vector[Byte]] = { for { url <- Fork(urls) data <- downloader(url) byte <- Each(data) } yield byte }.as[Task[Vector[Byte]]]
A Task can be also created from Task.apply
def mockDownloader(url: URL) = Task { "mock data\n".getBytes.toVector }
A Task can be then converted to scala.concurrent.Future via Task.toFuture,
in order to integrate into other frameworks.
In this example, it's a Future[Assertion] required by org.scalatest.AsyncFreeSpec.
val mockUrls = List(new URL("http://example.com/file1"), new URL("http://example.com/file2")) import org.scalatest.Assertion def assertion: Task[Assertion] = Task { !concatenateRemoteData(mockUrls, mockDownloader) should be("mock data\nmock data\n".getBytes.toVector) } Task.toFuture(assertion)
Author:
杨博 (Yang Bo)