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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2005-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.actors
package scheduler
import java.lang.{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
*/
private[scheduler] trait TerminationService extends TerminationMonitor {
_: Thread with IScheduler =>
private var terminating = false
/** Indicates whether the scheduler should terminate when all
* actors have terminated.
*/
protected val terminate = true
protected val CHECK_FREQ = 50
def onShutdown(): Unit
override def run() {
try {
while (true) {
this.synchronized {
try {
wait(CHECK_FREQ.toLong)
} catch {
case _: InterruptedException =>
}
if (terminating || (terminate && allActorsTerminated))
throw new QuitControl
gc()
}
}
} catch {
case _: QuitControl =>
Debug.info(this+": initiating shutdown...")
// invoke shutdown hook
onShutdown()
// allow thread to exit
}
}
/** Shuts down the scheduler.
*/
def shutdown(): Unit = synchronized {
terminating = true
}
}
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