Java tutorial
/* * Licensed to Metamarkets Group Inc. (Metamarkets) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. Metamarkets 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 io.druid.query.aggregation.datasketches.quantiles; import java.io.BufferedWriter; import java.nio.charset.StandardCharsets; import java.nio.file.FileSystems; import java.nio.file.Files; import java.nio.file.Path; import java.util.Random; import org.apache.commons.codec.binary.Base64; import com.yahoo.sketches.quantiles.UpdateDoublesSketch; // This is used for generating test data for DoublesSketchAggregatorTest public class GenerateTestData { public static void main(String[] args) throws Exception { Path buildPath = FileSystems.getDefault().getPath("doubles_build_data.tsv"); Path sketchPath = FileSystems.getDefault().getPath("doubles_sketch_data.tsv"); BufferedWriter buildData = Files.newBufferedWriter(buildPath, StandardCharsets.UTF_8); BufferedWriter sketchData = Files.newBufferedWriter(sketchPath, StandardCharsets.UTF_8); Random rand = new Random(); int sequenceNumber = 0; for (int i = 0; i < 20; i++) { int product = rand.nextInt(10); UpdateDoublesSketch sketch = UpdateDoublesSketch.builder().build(); for (int j = 0; j < 20; j++) { double value = rand.nextDouble(); buildData.write("2016010101"); buildData.write('\t'); buildData.write(Integer.toString(sequenceNumber)); // dimension with unique numbers for ingesting raw data buildData.write('\t'); buildData.write(Integer.toString(product)); // product dimension buildData.write('\t'); buildData.write(Double.toString(value)); buildData.newLine(); sketch.update(value); sequenceNumber++; } sketchData.write("2016010101"); sketchData.write('\t'); sketchData.write(Integer.toString(product)); // product dimension sketchData.write('\t'); sketchData.write(Base64.encodeBase64String(sketch.toByteArray(true))); sketchData.newLine(); } buildData.close(); sketchData.close(); } }