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first shot at general command/definition model

This commit is contained in:
Mark Harrah 2010-07-17 12:07:41 -04:00
parent 96c50975f2
commit b1b53e115e
1 changed files with 3 additions and 13 deletions
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16
util/control/ExitHook.scala
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@ -12,21 +12,11 @@ trait ExitHook extends NotNull
def runBeforeExiting(): Unit
}
trait ExitHookRegistry
object ExitHooks
{
def register(hook: ExitHook): Unit
def unregister(hook: ExitHook): Unit
}
class ExitHooks extends ExitHookRegistry
{
private val exitHooks = new scala.collection.mutable.HashSet[ExitHook]
def register(hook: ExitHook) { exitHooks += hook }
def unregister(hook: ExitHook) { exitHooks -= hook }
/** Calls each registered exit hook, trapping any exceptions so that each hook is given a chance to run. */
def runExitHooks(debug: String => Unit): List[Throwable] =
exitHooks.toList.flatMap( hook =>
def runExitHooks(exitHooks: Seq[ExitHook]): Seq[Throwable] =
exitHooks.flatMap( hook =>
ErrorHandling.wideConvert( hook.runBeforeExiting() ).left.toOption
)
}