Comparison of Java Serialisers

niels — Mon, 24 Oct 2011 18:12:30 +0000

The JVM Serialisers project provides a very extensive comparison of dozens of different JVM serializers out there. Tested tools include several JSON libs, different XML related libs, Scala, protobuf, protostuf, msgpack and many more.
I didn’t know protostuff before – it seems to be really amazing!

(via tutego)

Displaying the latest global Subversion revision ID in an application

niels — Mon, 21 Jun 2010 19:40:12 +0000

When you have to display the latest global svn revision number in your application you face different options.
Using Subversion keywords, like $Revision$ or $Id$, sounds like the most natural approach. Unfortunately the keywords are updated only when you change and commit the corresponding file. In short: if you intend to grab the revision ID from a central header file, like version.h, this file has to be edited and committed whenever a svn commit on any file in your project takes place. So either you do that manually (“erm, no?” – right!), or you create a commit hook and bloat your repository.
Another approach is to fetch the latest number of the latest revision and update your version.h as part of your build. In short: whenever you trigger a build by calling make, ant or build your project in your IDE, you invoke a script that generates your header file (or .java, .cs, .rb … you name it). On Linux and Unix, you might use a script just like this:

#!/bin/csh
set SVNREV=`svnversion -n`
 
set FILENAME=$my/path/to/include/version.h
echo '/*******************************************************************' > $FILENAME
echo '* '>> $FILENAME
echo '* This include file is automatically generated. All manual ' >> $FILENAME
echo '* changes will be lost.'  >> $FILENAME
echo '* ' >> $FILENAME
echo '*******************************************************************/' >> $FILENAME
echo '' >> $FILENAME
echo '/* latest Subversion revision */'  >> $FILENAME
echo '#define SVNREV ' $SVNREV >> $FILENAME
echo '' >> $FILENAME

If you develop on Windows, you might adopt this script:

@echo off
 
REM store latest revision number as SVNREV
for /f "delims=:" %%a in ('svnversion') do @set SVNREV=%%a
 
set FILENAME=%my%\path\to\include\version.h
echo /*******************************************************************  > %FILENAME%
echo * >> %FILENAME%
echo * This include file is automatically generated. All manual  >> %FILENAME%
echo * changes will be lost.  >> %FILENAME%
echo * >> %FILENAME%
echo *******************************************************************/  >> %FILENAME%
echo.  >> %FILENAME%
echo /* latest Subversion revision */  >> %FILENAME%
echo #define SVNREV  %SVNREV$ >> %FILENAME%
echo.  >> %FILENAME%

Make sure that you add version.h to svn:ignore.

logic involved » coding

Comparison of Java Serialisers

Displaying the latest global Subversion revision ID in an application