| /* |
| * 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 org.apache.druid.query.aggregation; |
| |
| import org.apache.druid.query.monomorphicprocessing.RuntimeShapeInspector; |
| import org.apache.druid.segment.BaseFloatColumnValueSelector; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Arrays; |
| |
| public class HistogramBufferAggregator implements BufferAggregator |
| { |
| private final BaseFloatColumnValueSelector selector; |
| private final float[] breaks; |
| private final int minOffset; |
| private final int maxOffset; |
| |
| public HistogramBufferAggregator(BaseFloatColumnValueSelector selector, float[] breaks) |
| { |
| this.selector = selector; |
| this.breaks = breaks; |
| this.minOffset = Long.BYTES * (breaks.length + 1); |
| this.maxOffset = this.minOffset + Float.BYTES; |
| } |
| |
| @Override |
| public void init(ByteBuffer buf, int position) |
| { |
| ByteBuffer mutationBuffer = buf.duplicate(); |
| mutationBuffer.position(position); |
| |
| final long[] bins = new long[breaks.length + 1]; |
| mutationBuffer.asLongBuffer().put(bins); |
| mutationBuffer.putFloat(position + minOffset, Float.POSITIVE_INFINITY); |
| mutationBuffer.putFloat(position + maxOffset, Float.NEGATIVE_INFINITY); |
| } |
| |
| @Override |
| public void aggregate(ByteBuffer buf, int position) |
| { |
| final float value = selector.getFloat(); |
| final int minPos = position + minOffset; |
| final int maxPos = position + maxOffset; |
| |
| if (value < buf.getFloat(minPos)) { |
| buf.putFloat(minPos, value); |
| } |
| if (value > buf.getFloat(maxPos)) { |
| buf.putFloat(maxPos, value); |
| } |
| |
| int index = Arrays.binarySearch(breaks, value); |
| index = (index >= 0) ? index : -(index + 1); |
| |
| final int offset = position + (index * Long.BYTES); |
| final long count = buf.getLong(offset); |
| buf.putLong(offset, count + 1); |
| } |
| |
| @Override |
| public Object get(ByteBuffer buf, int position) |
| { |
| long[] bins = new long[breaks.length + 1]; |
| ByteBuffer mutationBuffer = buf.duplicate(); |
| mutationBuffer.position(position); |
| mutationBuffer.asLongBuffer().get(bins); |
| |
| float min = mutationBuffer.getFloat(position + minOffset); |
| float max = mutationBuffer.getFloat(position + maxOffset); |
| return new Histogram(breaks, bins, min, max); |
| } |
| |
| @Override |
| public float getFloat(ByteBuffer buf, int position) |
| { |
| throw new UnsupportedOperationException("HistogramBufferAggregator does not support getFloat()"); |
| } |
| |
| @Override |
| public long getLong(ByteBuffer buf, int position) |
| { |
| throw new UnsupportedOperationException("HistogramBufferAggregator does not support getLong()"); |
| } |
| |
| @Override |
| public double getDouble(ByteBuffer buf, int position) |
| { |
| throw new UnsupportedOperationException("HistogramBufferAggregator does not support getDouble"); |
| } |
| |
| @Override |
| public void close() |
| { |
| // no resources to cleanup |
| } |
| |
| @Override |
| public void inspectRuntimeShape(RuntimeShapeInspector inspector) |
| { |
| inspector.visit("selector", selector); |
| } |
| } |