org.elasticsearch.search.aggregations.pipeline.bucketmetrics.percentile.PercentilesBucketPipelineAggregator Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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 org.elasticsearch.search.aggregations.pipeline.bucketmetrics.percentile;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.InternalAggregation.Type;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregatorFactory;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregatorStreams;
import org.elasticsearch.search.aggregations.pipeline.bucketmetrics.BucketMetricsPipelineAggregator;
import org.elasticsearch.search.aggregations.support.format.ValueFormatter;
import java.io.IOException;
import java.util.*;
import static org.elasticsearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;
public class PercentilesBucketPipelineAggregator extends BucketMetricsPipelineAggregator {
public final static Type TYPE = new Type("percentiles_bucket");
public final static PipelineAggregatorStreams.Stream STREAM = new PipelineAggregatorStreams.Stream() {
@Override
public PercentilesBucketPipelineAggregator readResult(StreamInput in) throws IOException {
PercentilesBucketPipelineAggregator result = new PercentilesBucketPipelineAggregator();
result.readFrom(in);
return result;
}
};
public static void registerStreams() {
PipelineAggregatorStreams.registerStream(STREAM, TYPE.stream());
InternalPercentilesBucket.registerStreams();
}
private double[] percents;
private List data;
private PercentilesBucketPipelineAggregator() {
}
protected PercentilesBucketPipelineAggregator(String name, double[] percents, String[] bucketsPaths, GapPolicy gapPolicy,
ValueFormatter formatter, Map metaData) {
super(name, bucketsPaths, gapPolicy, formatter, metaData);
this.percents = percents;
}
@Override
public Type type() {
return TYPE;
}
@Override
protected void preCollection() {
data = new ArrayList<>(1024);
}
@Override
protected void collectBucketValue(String bucketKey, Double bucketValue) {
data.add(bucketValue);
}
@Override
protected InternalAggregation buildAggregation(List pipelineAggregators, Map metadata) {
// Perform the sorting and percentile collection now that all the data
// has been collected.
Collections.sort(data);
double[] percentiles = new double[percents.length];
if (data.size() == 0) {
for (int i = 0; i < percents.length; i++) {
percentiles[i] = Double.NaN;
}
} else {
for (int i = 0; i < percents.length; i++) {
int index = (int)((percents[i] / 100.0) * data.size());
percentiles[i] = data.get(index);
}
}
// todo need postCollection() to clean up temp sorted data?
return new InternalPercentilesBucket(name(), percents, percentiles, formatter, pipelineAggregators, metadata);
}
@Override
public void innerReadFrom(StreamInput in) throws IOException {
percents = in.readDoubleArray();
}
@Override
public void innerWriteTo(StreamOutput out) throws IOException {
out.writeDoubleArray(percents);
}
public static class Factory extends PipelineAggregatorFactory {
private final ValueFormatter formatter;
private final GapPolicy gapPolicy;
private final double[] percents;
public Factory(String name, String[] bucketsPaths, GapPolicy gapPolicy, ValueFormatter formatter, double[] percents) {
super(name, TYPE.name(), bucketsPaths);
this.gapPolicy = gapPolicy;
this.formatter = formatter;
this.percents = percents;
}
@Override
protected PipelineAggregator createInternal(Map metaData) throws IOException {
return new PercentilesBucketPipelineAggregator(name, percents, bucketsPaths, gapPolicy, formatter, metaData);
}
@Override
public void doValidate(AggregatorFactory parent, AggregatorFactory[] aggFactories,
List pipelineAggregatorFactories) {
if (bucketsPaths.length != 1) {
throw new IllegalStateException(PipelineAggregator.Parser.BUCKETS_PATH.getPreferredName()
+ " must contain a single entry for aggregation [" + name + "]");
}
for (Double p : percents) {
if (p == null || p < 0.0 || p > 100.0) {
throw new IllegalStateException(PercentilesBucketParser.PERCENTS.getPreferredName()
+ " must only contain non-null doubles from 0.0-100.0 inclusive");
}
}
}
}
}