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/* Title: Pure/Concurrent/event_timer.scala
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Author: Makarius
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Initiate event after given point in time.
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Note: events are run as synchronized action within a dedicated thread
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and should finish quickly without further ado.
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*/
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package isabelle
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import java.util.{Timer, TimerTask, Date => JDate}
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object Event_Timer
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{
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private lazy val event_timer = new Timer("event_timer", true)
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final class Request private[Event_Timer](val time: Time, task: TimerTask)
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{
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def cancel: Boolean = task.cancel
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}
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def request(time: Time)(event: => Unit): Request =
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{
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val task = new TimerTask { def run { event } }
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event_timer.schedule(task, new JDate(time.ms))
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new Request(time, task)
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}
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}
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