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/* NSC -- new Scala compiler
* Copyright 2005-2011 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools
package util
/** A class for things which are signallable.
*/
abstract class Signallable[T] private (val signal: String, val description: String) {
private var last: Option[T] = None
private def lastString = last filterNot (_ == ()) map (_.toString) getOrElse ""
/** The most recent result from the signal handler. */
def lastResult: Option[T] = last
/** Method to be executed when the associated signal is received. */
def onSignal(): T
// todo:
// def unregister(): Boolean
override def toString = " SIG(%s) => %s%s".format(
signal, description, if (lastString == "") "" else " (" + lastString + ")"
)
}
object Signallable {
/** Same as the other apply, but an open signal is found for you.
*/
def apply[T](description: String)(body: => T): Signallable[T] =
apply(SignalManager.findOpenSignal().name, description)(body)
/** Given a signal name, a description, and a handler body, this
* registers a signal handler and returns the Signallable instance.
* The signal handler registry is thereafter available by calling
* SignalManager.info(), or sending SIGINFO to the manager will
* dump it to console.
*/
def apply[T](signal: String, description: String)(body: => T): Signallable[T] = {
val result = new Signallable[T](signal, description) {
def onSignal(): T = {
val result = body
last = Some(result)
result
}
}
SignalManager.public(signal, description)(result.onSignal())
result
}
}
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