com.linkedin.pinot.tools.query.comparison.StatsGenerator.java Source code

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Here is the source code for com.linkedin.pinot.tools.query.comparison.StatsGenerator.java

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/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * Licensed 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.linkedin.pinot.tools.query.comparison;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.commons.math.stat.descriptive.DescriptiveStatistics;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class StatsGenerator {
    private static final Logger LOGGER = LoggerFactory.getLogger(StatsGenerator.class);

    public static void generateReport(String dataFileName) throws IOException {
        List<DescriptiveStatistics> statisticsList = new ArrayList<>();

        String dataString;
        BufferedReader dataReader = new BufferedReader(new FileReader(dataFileName));

        // First line is treated as header
        String[] columns = dataReader.readLine().split("\\s+");
        int numColumns = columns.length;

        for (int i = 0; i < numColumns; ++i) {
            statisticsList.add(new DescriptiveStatistics());
        }

        while ((dataString = dataReader.readLine()) != null) {
            String[] dataArray = dataString.trim().split(" ");

            if (dataArray.length != numColumns) {
                throw new RuntimeException("Row has missing columns: " + Arrays.toString(dataArray) + " Expected: "
                        + numColumns + " columns.");
            }

            for (int i = 0; i < dataArray.length; ++i) {
                double data = Double.valueOf(dataArray[i]);
                statisticsList.get(i).addValue(data);
            }
        }

        for (int i = 0; i < numColumns; i++) {
            LOGGER.info("Stats: {}: {}", columns[i], statisticsList.get(i).toString().replace("\n", "\t"));
        }
    }

    public static void main(String[] args) throws IOException {
        if (args.length != 1) {
            LOGGER.error("Invalid arguments.");
            LOGGER.info("Usage: <exec> <data_file>");
        }

        try {
            String dataFile = args[0];
            StatsGenerator perfReportGenerator = new StatsGenerator();
            perfReportGenerator.generateReport(dataFile);
        } catch (Exception e) {
            LOGGER.error("Exception caught: ", e);
        }
    }
}