/*
* Copyright (c) 2015 Spotify AB.
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package com.spotify.heroic.aggregation.simple;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.spotify.heroic.aggregation.AggregationContext;
import com.spotify.heroic.aggregation.SamplingAggregation;
import com.spotify.heroic.aggregation.SamplingQuery;
import com.spotify.heroic.common.Duration;
import com.spotify.heroic.common.Optionals;
import lombok.Data;
import lombok.EqualsAndHashCode;
import java.util.Optional;
@Data
@EqualsAndHashCode(callSuper = true)
public class Quantile extends SamplingAggregation {
public static final String NAME = "quantile";
public static final double DEFAULT_QUANTILE = 0.5;
public static final double DEFAULT_ERROR = 0.01;
private final Optional<Double> q;
private final Optional<Double> error;
@JsonCreator
public Quantile(
@JsonProperty("sampling") Optional<SamplingQuery> sampling,
@JsonProperty("size") Optional<Duration> size,
@JsonProperty("extent") Optional<Duration> extent, @JsonProperty("q") Optional<Double> q,
@JsonProperty("error") Optional<Double> error
) {
super(Optionals.firstPresent(size, sampling.flatMap(SamplingQuery::getSize)),
Optionals.firstPresent(extent, sampling.flatMap(SamplingQuery::getExtent)));
this.q = q;
this.error = error;
}
@Override
public QuantileInstance apply(AggregationContext context, final long size, final long extent) {
return new QuantileInstance(size, extent, q.orElse(DEFAULT_QUANTILE),
error.orElse(DEFAULT_ERROR));
}
private String percentage(double v) {
return Integer.toString((int) Math.min(100, Math.max(0, Math.round(v * 100))));
}
}