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The driver API for engineblock; Provides the interfaces needed to build drivers that can be loaded by engineblock core
There is a newer version: 2.12.65
/*
 *
 *    Copyright 2016 jshook
 *    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 io.engineblock.metrics;

import org.HdrHistogram.Histogram;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.Date;
import java.util.Locale;

public class HistoStatsCSVWriter {
    private final static Logger logger = LoggerFactory.getLogger(HistoStatsCSVWriter.class);
    private final static String logFormatVersion = "1.0";
    private final File csvfile;
    //    FileWriter writer;
    PrintStream writer;
    private long baseTime;

    public HistoStatsCSVWriter(File csvFile) {
        this.csvfile = csvFile;
        writer = initFile(csvFile);
    }

    private PrintStream initFile(File logfile) {
        try {
            FileOutputStream fileOutputStream = new FileOutputStream(logfile);
            PrintStream writer = new PrintStream(logfile);
            return writer;
        } catch (IOException e) {
            logger.error(e.getMessage(), e);
            throw new RuntimeException(e);
        }
    }

    public void setBaseTime(long baseTime) {
        this.baseTime = baseTime;
    }

    public void outputComment(String comment) {
        writer.format(Locale.US, "#%s\n", comment);
    }

    public void outputLogFormatVersion() {
        writer.format(Locale.US, "#[Histogram log format version %s]\n", logFormatVersion);
    }

    public void outputStartTime(long startTime) {
        writer.format(
                Locale.US,
                "#[StartTime: %.3f (seconds since epoch), %s]\n",
                startTime / 1000.0,
                new Date(startTime).toString()
        );
        writer.flush();
    }

    public void outputLegend() {
        writer.format(Locale.US, "#Tag,Interval_Start,Interval_Length,count,min,p25,p50,p75,p90,p95,p98,p99,p999,p9999,max\n");
    }

    public void writeInterval(Histogram h) {
        StringBuilder csvLine = new StringBuilder(1024);
        csvLine.append("Tag=").append(h.getTag()).append(",");
        Double start = ((double) h.getStartTimeStamp() - baseTime) / 1000.0D;
        Double end = ((double) h.getEndTimeStamp() - baseTime) / 1000.0D;
        String len = String.format(Locale.US, "%.3f", (end - start));
        csvLine.append(start);
        csvLine.append(",").append(len);
        csvLine.append(",").append(h.getTotalCount());
        csvLine.append(",").append(h.getMinValue());
        csvLine.append(",").append(h.getValueAtPercentile(0.25D));
        csvLine.append(",").append(h.getValueAtPercentile(0.50D));
        csvLine.append(",").append(h.getValueAtPercentile(0.75D));
        csvLine.append(",").append(h.getValueAtPercentile(0.90D));
        csvLine.append(",").append(h.getValueAtPercentile(0.95D));
        csvLine.append(",").append(h.getValueAtPercentile(0.98D));
        csvLine.append(",").append(h.getValueAtPercentile(0.99D));
        csvLine.append(",").append(h.getValueAtPercentile(0.999D));
        csvLine.append(",").append(h.getValueAtPercentile(0.9999D));
        csvLine.append(",").append(h.getMaxValue());
        writer.println(csvLine.toString());

    }
}