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 package com.codahale.metrics;
 import static java.lang.Math.min;

A Reservoir implementation backed by a sliding window that stores the last N measurements.
 public class SlidingWindowReservoir implements Reservoir {
    private final long[] measurements;
    private long count;

Creates a new SlidingWindowReservoir which stores the last size measurements.

size the number of measurements to store
    public SlidingWindowReservoir(int size) {
        this. = new long[size];
        this. = 0;
    public synchronized int size() {
        return (intmin(.);
    public synchronized void update(long value) {
        [((int++ % .)] = value;
    public Snapshot getSnapshot() {
        final long[] values = new long[size()];
        for (int i = 0; i < values.lengthi++) {
            synchronized (this) {
                values[i] = [i];
        return new Snapshot(values);
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