blob: f2c621b012d75ea1804d327db7b356f1ce81367f (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
|
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)
}
|