| /** |
| * 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.jwplayer.sqe.trident.aggregator; |
| |
| import com.clearspring.analytics.stream.cardinality.CardinalityMergeException; |
| import com.clearspring.analytics.stream.cardinality.HyperLogLogPlus; |
| |
| import java.io.IOException; |
| |
| public class HllpCombinerAggregator extends CardinalityEstimatorCombinerAggregator { |
| private int log2m; |
| |
| public HllpCombinerAggregator(int log2m) { |
| this.log2m = log2m; |
| } |
| |
| @Override |
| public byte[] combine(byte[] bitmap1, byte[] bitmap2) { |
| try { |
| HyperLogLogPlus hllp1 = HyperLogLogPlus.Builder.build(bitmap1); |
| HyperLogLogPlus hllp2 = HyperLogLogPlus.Builder.build(bitmap2); |
| hllp1.addAll(hllp2); |
| return hllp1.getBytes(); |
| } catch (CardinalityMergeException |IOException ex) { |
| throw new RuntimeException(ex); |
| } |
| } |
| |
| @Override |
| public byte[] zero() { |
| try { |
| return (new HyperLogLogPlus(log2m, log2m)).getBytes(); |
| } catch(IOException ex) { |
| throw new RuntimeException(ex); |
| } |
| } |
| } |