scala.sys.ShutdownHookThread.scala Maven / Gradle / Ivy
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/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package scala
package sys
/** A minimal Thread wrapper to enhance shutdown hooks. It knows
* how to unregister itself.
*/
class ShutdownHookThread private (runnable: Runnable, name: String) extends Thread(runnable, name) {
def remove() = Runtime.getRuntime removeShutdownHook this
}
object ShutdownHookThread {
private[this] var hookNameCount: Int = 0
private def hookName(): String = synchronized {
hookNameCount += 1
"shutdownHook" + hookNameCount
}
/** Creates, names, and registers a shutdown hook to run the
* given code.
*/
def apply(body: => Unit): ShutdownHookThread = {
val t = new ShutdownHookThread(() => body, hookName())
Runtime.getRuntime addShutdownHook t
t
}
}