/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v1.0 as published by
    * the Eclipse Foundation
    *
    *   or (per the licensee's choosing)
   *
   * under the terms of the GNU Lesser General Public License version 2.1
   * as published by the Free Software Foundation.
   */
  package ch.qos.logback.classic.multiJVM;
  
  import org.slf4j.Logger;
  
  import ch.qos.logback.classic.LoggerContext;
  import ch.qos.logback.classic.encoder.PatternLayoutEncoder;
  import ch.qos.logback.classic.spi.ILoggingEvent;
  import ch.qos.logback.core.FileAppender;
  
  /**
   * An application to write to a file using a FileAppender in safe mode.
   * 
   * @author Ceki Gulcu
   * 
   */
  public class SafeModeFileAppender {
  
      static long LEN;
      static String FILENAME;
      static String STAMP;
  
      static public void main(String[] argv) throws Exception {
          if (argv.length != 3) {
              usage("Wrong number of arguments.");
          }
  
          STAMP = argv[0];
          LEN = Integer.parseInt(argv[1]);
          FILENAME = argv[2];
          writeContinously(STAMP, FILENAME, true);
      }
  
      static void usage(String msg) {
          System.err.println(msg);
          System.err.println("Usage: java " + SafeModeFileAppender.class.getName() + " stamp runLength filename\n"
                  + " stamp JVM instance stamp\n" + "   runLength (integer) the number of logs to generate perthread"
                  + "    filename (string) the filename where to write\n");
          System.exit(1);
      }
  
      static LoggerContext buildLoggerContext(String stamp, String filename, boolean safetyMode) {
          LoggerContext loggerContext = new LoggerContext();
  
          FileAppender<ILoggingEvent> fa = new FileAppender<ILoggingEvent>();
  
          PatternLayoutEncoder patternLayout = new PatternLayoutEncoder();
          patternLayout.setPattern(stamp + " %5p - %m%n");
          patternLayout.setContext(loggerContext);
          patternLayout.start();
  
          fa.setEncoder(patternLayout);
          fa.setFile(filename);
          fa.setAppend(true);
          fa.setPrudent(safetyMode);
          fa.setContext(loggerContext);
          fa.start();
  
          ch.qos.logback.classic.Logger root = loggerContext.getLogger(Logger.ROOT_LOGGER_NAME);
          root.addAppender(fa);
  
          return loggerContext;
      }
  
      static void writeContinously(String stamp, String filename, boolean safetyMode) throws Exception {
          LoggerContext lc = buildLoggerContext(stamp, filename, safetyMode);
          Logger logger = lc.getLogger(SafeModeFileAppender.class);
  
          long before = System.nanoTime();
          for (int i = 0; i < LEN; i++) {
              logger.debug(LoggingThread.msgLong + " " + i);
          }
          lc.stop();
          double durationPerLog = (System.nanoTime() - before) / (LEN * 1000.0);
  
          System.out.println(
                  "Average duration of " + (durationPerLog) + " microseconds per log. Safety mode " + safetyMode);
          System.out.println("------------------------------------------------");
      }
  }