ludovicc

Topics to talk about at FOSDEM 2010 regarding Debian-Java:

 * Status of maven-repo
 * Merge of javahelper and maven-repo-helper?
 * Dependencies - versioned or not?
 * Versioned .jar files? why? parallell installation?
 * CDBS vs. Debhelper7, dh -with maven?
 * why it's useful to package Java software, Java packaging is way behind python packaging
 * Bridging two great packaging systems: Debian apt and Maven
 * OSGi in Debian: the promise of always on, always up-to-date systems

ludovicc

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-release-plugin</artifactId>
  <version>2.2.1</version>
  <configuration>
    <autoVersionSubmodules>true</autoVersionSubmodules>
    <!-- required for Git -->
    <localCheckout>true</localCheckout>
    <preparationGoals>clean verify</preparationGoals>
    <releaseProfiles>release</releaseProfiles>

ludovicc

#
# Suppose that you are happily working with your sources in Git, and manager says 'Thou shalt use the company's Perforce repository'
#
# And you strike a deal: I keep working on Git, but all releases will also be published on Perforce
#
# === Initial setup, run this script once

# My project under Git is located at ~/MyProject

cd MyProject

ludovicc

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;

ludovicc

package game;

import static java.lang.Integer.MAX_VALUE;
import static java.lang.System.out;
import static java.nio.channels.FileChannel.MapMode.READ_ONLY;
import static java.nio.channels.FileChannel.MapMode.READ_WRITE;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;

ludovicc

/**
 * {@link http://mechanical-sympathy.blogspot.fr/2012/08/memory-access-patterns-are-important.html}
 *
 * Run with the -Xmx4g JVM option.
 */
public class TestMemoryAccessPatterns {
	private static final int LONG_SIZE = 8;
	private static final int PAGE_SIZE = 2 * 1024 * 1024;
	private static final int ONE_GIG = 1024 * 1024 * 1024;
	private static final long TWO_GIG = 2L * ONE_GIG;

ludovicc

/usr/lib/jvm/java-1.7.0-openjdk-amd64/bin/java -Xmx4g -cp . TestSequentialIoPerf

RandomAccessFile	write=54,328,651	read=60,534,405 bytes/sec
RandomAccessFile	write=59,765,083	read=55,440,505 bytes/sec
RandomAccessFile	write=61,703,473	read=61,216,559 bytes/sec
RandomAccessFile	write=57,671,052	read=61,041,399 bytes/sec
RandomAccessFile	write=59,171,939	read=60,650,931 bytes/sec
BufferedStreamFile	write=52,955,816	read=65,539,670 bytes/sec
BufferedStreamFile	write=69,623,157	read=70,514,917 bytes/sec
BufferedStreamFile	write=83,528,763	read=96,234,948 bytes/sec

ludovicc

public class Unicorn {

	private static StackTraceElement[] previousTrace;

	public static boolean pat() {

		Throwable t = new Exception();
		StackTraceElement[] trace = t.getStackTrace();

		if (previousTrace == null) {

ludovicc

#!/bin/bash

sudo xcodebuild -license

if rvm --version 2>/dev/null; then
  gem install soloist
else
  sudo gem install soloist
fi

ludovicc

Keybase proof

I hereby claim:

• I am ludovicc on github.
• I am ludovicc (https://keybase.io/ludovicc) on keybase.
• I have a public key whose fingerprint is 4B02 0161 E88B 495D D15F 9D6F 89A6 16FE B21B 3EBD

To claim this, I am signing this object: