FlameGraphDumperApplication.java

/**
 * Copyright (c) 2015 Richard Warburton (richard.warburton@gmail.com)
 * <p>
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * <p>
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * <p>
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 **/
package com.insightfullogic.honest_profiler.ports.console;

import com.insightfullogic.honest_profiler.core.collector.FlameGraphCollector;
import com.insightfullogic.honest_profiler.core.parser.Method;
import com.insightfullogic.honest_profiler.core.profiles.FlameGraph;
import com.insightfullogic.honest_profiler.core.profiles.FlameTrace;
import com.insightfullogic.honest_profiler.core.sources.LogSource;
import com.insightfullogic.honest_profiler.ports.javafx.view.Rendering;
import com.insightfullogic.honest_profiler.ports.sources.FileLogSource;

import java.io.*;
import java.util.List;
import java.util.stream.Collectors;

/**
 * Dump's out a flame graph which can be processed with
 * <a href="https://github.com/brendangregg/FlameGraph">Brendan Gregg's flame graph tools</a>.
 */
public class FlameGraphDumperApplication
{
    public static void main(String[] args) throws Exception
    {
        if (args.length < 2)
        {
            System.out.print(
                "Usage: java com.insightfullogic.honest_profiler.ports.console.FlameGraphApplication <profile.hpl> <profile.txt>\n" +
                    "\n" +
                    "The output needs to be processed with the tools at https://github.com/brendangregg/FlameGraph to produce the actual flamegraph\n");
            System.exit(1);
        }

        String in = args[0], out = args[1];
        LogSource source = new FileLogSource(new File(in));

        try (Writer output = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(out))))
        {
            FlameGraph data = FlameGraphCollector.readFlamegraph(source);

            for (FlameTrace trace : data.getTraces())
            {
                writeTrace(output, trace);
            }
        }
    }

    private static void writeTrace(Writer out, FlameTrace flameTrace) throws IOException
    {
        List<Method> methods = flameTrace.getMethods();

        if (methods.size() == 0)
            return;

        out.write(
            methods.stream()
                .map(Rendering::renderMethod)
                .collect(Collectors.joining(";")));

        out.write(" ");
        out.write(Long.toString(flameTrace.getWeight()));
        out.write("\n");
    }

}