Java tutorial
/* * Copyright (C) 2015 hops.io. * * 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.hops.leaderElection.experiments; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.PrintWriter; import java.util.StringTokenizer; public class ExperimentDriver { private Process process; private static final String JAR_FILE = "hops-leader-election-2.0.4-alpha-jar-with-dependencies.jar"; private static final Log LOG = LogFactory.getLog(ExperimentDriver.class); public static void main(String[] argv) throws FileNotFoundException, IOException, InterruptedException { String experimentFile = "experiments_descriptions.txt"; if (argv.length != 1) { System.out.println("Please specify the file containing experiment parameters "); System.out.println("Trying to read defaule file " + experimentFile); } else { experimentFile = argv[0]; } new ExperimentDriver().runCommands(experimentFile); } private void runCommands(String file) throws FileNotFoundException, IOException, InterruptedException { if (!new File(file).exists()) { LOG.error("File Does not exists"); return; } BufferedReader br = new BufferedReader(new FileReader(file)); String line; while ((line = br.readLine()) != null) { if (line.startsWith("#") || line.trim().isEmpty()) { continue; } StringTokenizer st = new StringTokenizer(line, " "); int numProcesses = -1; String timeToRep = st.nextToken(); int timesToRepeat = Integer.parseInt(timeToRep); line = line.substring(timeToRep.length(), line.length()); String outputFileName = null; while (st.hasMoreElements()) { if (st.nextElement().equals("-max_processes")) { numProcesses = Integer.parseInt(st.nextToken()); outputFileName = numProcesses + ".log"; break; } } LOG.info("Going to repeat the experiment of " + timesToRepeat + " times"); for (int i = 0; i < timesToRepeat; i++) { // run command 10 times String command = line + " -output_file_path " + outputFileName; LOG.info("Driver going to run command " + command); runCommand(command); } LOG.info("Going to calculate points from file " + outputFileName); calculateNumbers(numProcesses, outputFileName); } br.close(); } private void calculateNumbers(int numProcesses, String outputFileName) throws FileNotFoundException, IOException { if (!new File(outputFileName).exists()) { LOG.error("File " + outputFileName + " does not exists"); return; } String marker = "DataPoints: "; String line; DescriptiveStatistics failOverStats = new DescriptiveStatistics(); DescriptiveStatistics tpStats = new DescriptiveStatistics(); BufferedReader br = new BufferedReader(new FileReader(outputFileName)); while ((line = br.readLine()) != null) { if (!line.startsWith(marker)) { continue; } boolean tpStatRecorded = false; String numbers = line.substring(marker.length(), line.length()); StringTokenizer st = new StringTokenizer(numbers, ",[] "); while (st.hasMoreElements()) { double point = Double.parseDouble(st.nextToken()); if (!tpStatRecorded) { tpStats.addValue(point); tpStatRecorded = true; } else { failOverStats.addValue(point); } } } br.close(); writeMessageToFile(numProcesses, failOverStats, tpStats); } public void writeMessageToFile(int numProcesses, DescriptiveStatistics failOverStats, DescriptiveStatistics tpStats) throws IOException { PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("summary.log", true))); out.println(numProcesses + " " + tpStats.getN() + " " + tpStats.getMin() + " " + tpStats.getMax() + " " + tpStats.getMean() + " " + tpStats.getStandardDeviation() + " " + (tpStats.getStandardDeviation() / Math.sqrt(tpStats.getN())) + " " + failOverStats.getN() + " " + failOverStats.getMin() + " " + failOverStats.getMax() + " " + failOverStats.getMean() + " " + failOverStats.getStandardDeviation() + " " + (failOverStats.getStandardDeviation() / Math.sqrt(failOverStats.getN()))); out.close(); } private void runCommand(String args) throws IOException, InterruptedException { this.process = Runtime.getRuntime().exec(makeCommand(args)); if (process == null) { LOG.error("Failed to run experiment. Argv " + args); } else { new StreamGobbler(process.getInputStream()).start(); new StreamGobbler(process.getErrorStream()).start(); LOG.error("Process exited. Value " + process.waitFor()); } } private String makeCommand(String args) { String dir = System.getProperty("user.dir"); String jarFile = dir + File.separator + "target" + File.separator + JAR_FILE; if (!new File(jarFile).exists()) { jarFile = Experiment1.class.getProtectionDomain().getCodeSource().getLocation().getPath(); } String command = "java -Xmx10000m -cp " + jarFile + " Experiment1 " + args; LOG.error(command); return command; } class StreamGobbler extends Thread { InputStream is; // reads everything from is until empty. StreamGobbler(InputStream is) { this.is = is; } public void run() { try { InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); String line = null; while ((line = br.readLine()) != null) { System.out.println(line); } } catch (IOException ioe) { ioe.printStackTrace(); } } } }