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package kamon.util
/**
* Keeps track of the values produced by the source and produce the difference between the last two observed values
* when calling get. This class assumes the source increases monotonically and any produced value that violates this
* assumption will be dropped.
*
*/
class DifferentialSource(source: () => Long) {
private var previousValue = source()
def get(): Long = synchronized {
val currentValue = source()
val diff = currentValue - previousValue
previousValue = currentValue
if(diff < 0) 0 else diff
}
}
object DifferentialSource {
def apply(source: () => Long): DifferentialSource =
new DifferentialSource(source)
}
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