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/* sbt -- Simple Build Tool
* Copyright 2010 Mark Harrah
*/
package sbt
trait CompletionService[A, R]
{
def submit(node: A, work: () => R): Unit
def take(): R
}
import java.util.concurrent.{Callable, CompletionService => JCompletionService, Executor, Executors, ExecutorCompletionService}
object CompletionService
{
def apply[A, T](poolSize: Int): (CompletionService[A,T], () => Unit) =
{
val pool = Executors.newFixedThreadPool(poolSize)
(apply[A,T]( pool ), () => pool.shutdownNow() )
}
def apply[A, T](x: Executor): CompletionService[A,T] =
apply(new ExecutorCompletionService[T](x))
def apply[A, T](completion: JCompletionService[T]): CompletionService[A,T] =
new CompletionService[A, T] {
def submit(node: A, work: () => T) = CompletionService.submit(work, completion)
def take() = completion.take().get()
}
def submit[T](work: () => T, completion: JCompletionService[T]): () => T =
{
val future = completion.submit { new Callable[T] { def call = work() } }
() => future.get()
}
def manage[A, T](service: CompletionService[A,T])(setup: A => Unit, cleanup: A => Unit): CompletionService[A,T] =
wrap(service) { (node, work) => () =>
setup(node)
try { work() }
finally { cleanup(node) }
}
def wrap[A, T](service: CompletionService[A,T])(w: (A, () => T) => (() => T)): CompletionService[A,T] =
new CompletionService[A,T]
{
def submit(node: A, work: () => T) = service.submit(node, w(node, work))
def take() = service.take()
}
}
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