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/*
* 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<Double> data;
private PercentilesBucketPipelineAggregator() {
}
protected PercentilesBucketPipelineAggregator(String name, double[] percents, String[] bucketsPaths, GapPolicy gapPolicy,
ValueFormatter formatter, Map<String, Object> 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<PipelineAggregator> pipelineAggregators, Map<String, Object> 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 doReadFrom(StreamInput in) throws IOException {
super.doReadFrom(in);
percents = in.readDoubleArray();
}
@Override
public void doWriteTo(StreamOutput out) throws IOException {
super.doWriteTo(out);
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<String, Object> metaData) throws IOException {
return new PercentilesBucketPipelineAggregator(name, percents, bucketsPaths, gapPolicy, formatter, metaData);
}
@Override
public void doValidate(AggregatorFactory parent, AggregatorFactory[] aggFactories,
List<PipelineAggregatorFactory> 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");
}
}
}
}
}
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