com.emc.mongoose.base.metrics.snapshot.RateMetricSnapshotImpl Maven / Gradle / Ivy

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Mongoose is a high-load storage performance testing tool

There is a newer version: 4.3.10

package com.emc.mongoose.base.metrics.snapshot;

import java.util.List;

/** @author veronika K. on 12.10.18 */
public class RateMetricSnapshotImpl extends NamedCountMetricSnapshotImpl
				implements RateMetricSnapshot {

	private final double last;
	private final double mean;
	private final long elapsedTimeMillis;

	public RateMetricSnapshotImpl(
					final double last,
					final double mean,
					final String metricName,
					final long count,
					final long elapsedTimeMillis) {
		super(metricName, count);
		this.last = last;
		this.mean = mean;
		this.elapsedTimeMillis = elapsedTimeMillis;
	}

	public static RateMetricSnapshot aggregate(final List snapshots) {
		final int snapshotsCount = snapshots.size();
		if (snapshotsCount == 1) {
			return snapshots.get(0);
		}
		double lastRateSum = 0;
		double meanRateSum = 0;
		long countSum = 0;
		long maxElapsedTimeMillis = Long.MIN_VALUE;
		RateMetricSnapshot nextSnapshot;
		for (int i = 0; i < snapshotsCount; i++) {
			nextSnapshot = snapshots.get(i);
			countSum += nextSnapshot.count();
			lastRateSum += nextSnapshot.last();
			meanRateSum += nextSnapshot.mean();
			if (nextSnapshot.elapsedTimeMillis() > maxElapsedTimeMillis) {
				maxElapsedTimeMillis = nextSnapshot.elapsedTimeMillis();
			}
		}
		return new RateMetricSnapshotImpl(
						lastRateSum, meanRateSum, snapshots.get(0).name(), countSum, maxElapsedTimeMillis);
	}

	@Override
	public final double last() {
		return last;
	}

	@Override
	public final long elapsedTimeMillis() {
		return elapsedTimeMillis;
	}

	@Override
	public final double mean() {
		return mean;
	}
}