com.alachisoft.ncache.common.caching.statistics.customcounters.InstantaneousCounter Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of nc-common Show documentation

Internal package of Alachisoft.

There is a newer version: 5.3.3

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.alachisoft.ncache.common.caching.statistics.customcounters;

/**
 * @author Muneeb Shahid
 * 
 * Instantaneous counter is the base class for all types of instantaneous counters. An instantaneous counters values must change after each second i.e. on per second basis. All
 * values calculated in a time interval of one seconds becomes invalid for the next interval and it is re-initialized.
 */
public abstract class InstantaneousCounter extends PerformanceCounterBase {

    InstantaneousFlip currentFlip;

    public InstantaneousCounter(String name, String instance) {
        super(name, instance);
        currentFlip = FlipManager.flip.clone();
    }

    public InstantaneousCounter(String category, String name, String instance) {
        super(category, name, instance);
        currentFlip = FlipManager.flip.clone();
    }

    @Override
    public void increment() {
        incrementBy(1);
    }

    @Override
    public void incrementBy(double value) {
        synchronized (this) {
            if (!currentFlip.equals(FlipManager.flip)) {
                if (FlipManager.flip.getFlip() == currentFlip.getFlip() + 1) {
                    _lastValue = _value;
                } else {
                    _lastValue = 0;
                }
                _value = 0;
                currentFlip = FlipManager.flip.clone();
                flipChanged();
            }
            calculate(value);
        }
    }

    protected abstract void calculate(double value);

    protected abstract void flipChanged();

    @Override
    public double getValue() {
        updateIfFlipChanged();
        return _lastValue;
    }

    protected void updateIfFlipChanged() {
        synchronized (this) {
            if (!currentFlip.equals(FlipManager.flip)) {
                if (FlipManager.flip.getFlip() == currentFlip.getFlip() + 1) {
                    _lastValue = _value;
                } else {
                    _lastValue = 0;
                }
                _value = 0;
                currentFlip = FlipManager.flip.clone();
                flipChanged();
            }
        }
    }
}