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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/tPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.collection
package mutable
/** <code>History[A, B]</code> objects may subscribe to events of
* type <code>A</code> published by an object of type <code>B</code>.
* The history subscriber object records all published events
* up to maximum number of <code>maxHistory</code> events.
*
* @author Matthias Zenger
* @version 1.0, 08/07/2003
* @since 1
*/
@serializable
@SerialVersionUID(5219213543849892588L)
class History[Evt, Pub] extends Subscriber[Evt, Pub] with Iterable[(Pub, Evt)]
{
protected val log: Queue[(Pub, Evt)] = new Queue
val maxHistory: Int = 1000
/**
* @param pub ...
* @param event ...
*/
def notify(pub: Pub, event: Evt) {
if (log.length >= maxHistory)
log.dequeue
log.enqueue((pub, event))
}
override def size: Int = log.length
def iterator: Iterator[(Pub, Evt)] = log.iterator
def events: Iterator[Evt] = log.iterator map (_._2)
def clear() { log.clear }
/** Checks if two history objects are structurally identical.
*
* @return true, iff both history objects contain the same sequence of elements.
*/
override def equals(obj: Any): Boolean = obj match {
case that: History[_, _] => this.log equals that.log
case _ => false
}
}
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