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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2005-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id: $
package scala.actors.scheduler
import java.lang.{Runnable, Thread, InterruptedException}
/**
* The <code>TerminationService</code> class starts a new thread
* that is used to check regularly if the scheduler can be
* shut down, because all started actors are known to
* have terminated.
*
* @author Philipp Haller
*/
abstract class TerminationService(terminate: Boolean)
extends Thread with IScheduler with TerminationMonitor {
private var terminating = false
protected val CHECK_FREQ = 50
def onShutdown(): Unit
override def run() {
try {
while (true) {
this.synchronized {
try {
wait(CHECK_FREQ)
} catch {
case _: InterruptedException =>
}
if (terminating)
throw new QuitException
if (terminate && allTerminated)
throw new QuitException
}
}
} catch {
case _: QuitException =>
Debug.info(this+": initiating shutdown...")
// invoke shutdown hook
onShutdown()
// allow thread to exit
}
}
/** Submits a closure for execution.
*
* @param fun the closure to be executed
*/
def execute(fun: => Unit): Unit =
execute(new Runnable {
def run() { fun }
})
/** Shuts down the scheduler.
*/
def shutdown(): Unit = synchronized {
terminating = true
}
}
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