com.trivago.triava.tcache.statistics

Class SlidingWindowCounter

java.lang.Object

com.trivago.triava.tcache.statistics.SlidingWindowCounter

public class SlidingWindowCounter
extends Object

Created by astamenov on 29.05.2015.

Constructor Summary

Constructors

Constructor and Description
SlidingWindowCounter(int slotCount, int slotWidth)

Method Summary

Modifier and Type	Method and Description
int[]	getCopyOfSlots()
int	getRateTotal()
int	getRateTotal(long timeNowInSeconds)
void	registerEvents(long timestampInSeconds, int countOfEvents)
void	synchronizeTimePointer(long timeNowInSeconds) Synchronizes counter.timePointer with now.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SlidingWindowCounter

public SlidingWindowCounter(int slotCount,
                            int slotWidth)

Parameters:

slotCount - the number of slots.

slotWidth - the time span covered by a single slot in seconds.

Method Detail

registerEvents

public void registerEvents(long timestampInSeconds,
                           int countOfEvents)

getRateTotal

public int getRateTotal(long timeNowInSeconds)

getRateTotal

public int getRateTotal()

synchronizeTimePointer

public void synchronizeTimePointer(long timeNowInSeconds)

Synchronizes counter.timePointer with now. There are three scenarios possible: 1. abs(now - couner.timePointer) is within predefined limits 2. counter.timePointer is too far back in the past 3. counter.timePointer is too far ahead in the future Scenario 1: No action. Should be the most common scenario Scenario 2: Move counter.timePointer to now. Will happen for less active IPs. Scenario 3: No action. Could happen when server clocks drift too much from each other.

Parameters:

timeNowInSeconds - The current time in milliseconds since epoch

toString

public String toString()

Overrides:

toString in class Object

getCopyOfSlots

public int[] getCopyOfSlots()