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package spark.util
import scala.collection.mutable.Set
import scala.collection.JavaConversions
import java.util.concurrent.ConcurrentHashMap
class TimeStampedHashSet[A] extends Set[A] {
val internalMap = new ConcurrentHashMap[A, Long]()
def contains(key: A): Boolean = {
internalMap.contains(key)
}
def iterator: Iterator[A] = {
val jIterator = internalMap.entrySet().iterator()
JavaConversions.asScalaIterator(jIterator).map(_.getKey)
}
override def + (elem: A): Set[A] = {
val newSet = new TimeStampedHashSet[A]
newSet ++= this
newSet += elem
newSet
}
override def - (elem: A): Set[A] = {
val newSet = new TimeStampedHashSet[A]
newSet ++= this
newSet -= elem
newSet
}
override def += (key: A): this.type = {
internalMap.put(key, currentTime)
this
}
override def -= (key: A): this.type = {
internalMap.remove(key)
this
}
override def empty: Set[A] = new TimeStampedHashSet[A]()
override def size(): Int = internalMap.size()
override def foreach[U](f: (A) => U): Unit = {
val iterator = internalMap.entrySet().iterator()
while(iterator.hasNext) {
f(iterator.next.getKey)
}
}
/**
* Removes old values that have timestamp earlier than `threshTime`
*/
def clearOldValues(threshTime: Long) {
val iterator = internalMap.entrySet().iterator()
while(iterator.hasNext) {
val entry = iterator.next()
if (entry.getValue < threshTime) {
iterator.remove()
}
}
}
private def currentTime: Long = System.currentTimeMillis()
}
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