org.elasticsearch.search.aggregations.metrics.percentiles.hdr.AbstractInternalHDRPercentiles 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.metrics.percentiles.hdr;
import org.HdrHistogram.DoubleHistogram;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.metrics.InternalNumericMetricsAggregation;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;
import java.util.Map;
import java.util.zip.DataFormatException;
abstract class AbstractInternalHDRPercentiles extends InternalNumericMetricsAggregation.MultiValue {
protected final double[] keys;
protected final DoubleHistogram state;
private final boolean keyed;
public AbstractInternalHDRPercentiles(String name, double[] keys, DoubleHistogram state, boolean keyed, DocValueFormat format,
List pipelineAggregators,
Map metaData) {
super(name, pipelineAggregators, metaData);
this.keys = keys;
this.state = state;
this.keyed = keyed;
this.format = format;
}
/**
* Read from a stream.
*/
protected AbstractInternalHDRPercentiles(StreamInput in) throws IOException {
super(in);
format = in.readNamedWriteable(DocValueFormat.class);
keys = in.readDoubleArray();
long minBarForHighestToLowestValueRatio = in.readLong();
final int serializedLen = in.readVInt();
byte[] bytes = new byte[serializedLen];
in.readBytes(bytes, 0, serializedLen);
ByteBuffer stateBuffer = ByteBuffer.wrap(bytes);
try {
state = DoubleHistogram.decodeFromCompressedByteBuffer(stateBuffer, minBarForHighestToLowestValueRatio);
} catch (DataFormatException e) {
throw new IOException("Failed to decode DoubleHistogram for aggregation [" + name + "]", e);
}
keyed = in.readBoolean();
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeNamedWriteable(format);
out.writeDoubleArray(keys);
out.writeLong(state.getHighestToLowestValueRatio());
ByteBuffer stateBuffer = ByteBuffer.allocate(state.getNeededByteBufferCapacity());
final int serializedLen = state.encodeIntoCompressedByteBuffer(stateBuffer);
out.writeVInt(serializedLen);
out.writeBytes(stateBuffer.array(), 0, serializedLen);
out.writeBoolean(keyed);
}
@Override
public double value(String name) {
return value(Double.parseDouble(name));
}
public abstract double value(double key);
public long getEstimatedMemoryFootprint() {
return state.getEstimatedFootprintInBytes();
}
@Override
public AbstractInternalHDRPercentiles doReduce(List aggregations, ReduceContext reduceContext) {
DoubleHistogram merged = null;
for (InternalAggregation aggregation : aggregations) {
final AbstractInternalHDRPercentiles percentiles = (AbstractInternalHDRPercentiles) aggregation;
if (merged == null) {
merged = new DoubleHistogram(percentiles.state);
merged.setAutoResize(true);
}
merged.add(percentiles.state);
}
return createReduced(getName(), keys, merged, keyed, pipelineAggregators(), getMetaData());
}
protected abstract AbstractInternalHDRPercentiles createReduced(String name, double[] keys, DoubleHistogram merged, boolean keyed,
List pipelineAggregators, Map metaData);
@Override
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
if (keyed) {
builder.startObject(CommonFields.VALUES);
for(int i = 0; i < keys.length; ++i) {
String key = String.valueOf(keys[i]);
double value = value(keys[i]);
builder.field(key, value);
if (format != DocValueFormat.RAW) {
builder.field(key + "_as_string", format.format(value));
}
}
builder.endObject();
} else {
builder.startArray(CommonFields.VALUES);
for (int i = 0; i < keys.length; i++) {
double value = value(keys[i]);
builder.startObject();
builder.field(CommonFields.KEY, keys[i]);
builder.field(CommonFields.VALUE, value);
if (format != DocValueFormat.RAW) {
builder.field(CommonFields.VALUE_AS_STRING, format.format(value));
}
builder.endObject();
}
builder.endArray();
}
return builder;
}
}