0

PCT 0.18 is released

A regression was introduced in 0.17, released a few days ago ; incremental dumps were only working on 10.2A+. A bug fix release (named 0.18, but could have been named 0.17.1) was released yesterday. Download it from Google code !

Return values, exceptions and error status shouldn't be left unread...

I just lost three hours. Not really the end of the world, but really annoying when you find it was a stupid mistake, combined with badly written code.
I was working on an enhancement for PCT, allowing database connections to be made either with the standard dbName/dbDir/hostName/portNumber attributes, or with just a paramFile attribute. Just a few lines of code to change so that aliases are not broken, a few new test cases, done in half an hour, everything's working. In fact, no, database connections are done differently with background compilations. Spent two minutes correcting this mistake, copied/pasted test case for this task, and boom... Ran tests again, it works... Ran again, boom...
Test cases working half the time when you're working with thread and forked processes communicating with a main server usually mean that you're running into synchronization issues. Just in case, I take "Java concurrency in practice" from my bookshelf, ready to debug this problem. Adding some debug messages in OpenEdge sessions, trying different combinations, re-doing a complete schema of this inter-process and inter-thread communication, I'm unable to find the cause of the problem.
Until I find the "Ha ha" ! My test case is creating a Progress database, and two spawned sessions are compiling programs. But I'm running those sessions with single user connections. And there's NO ERROR HANDLING FOR CONNECTION FAILURES !!! So depending on the mood of my computer, compilation was sometimes done by the first thread, and sometimes by the second thread. No problem for the first thread, DB connection was OK, but the second thread was never able to connect the database (and so compile programs). But I never got a warning or error message saying that it wasn't able to connect...

Result : just lost time, and I have to modify error handling so that DB connections are gracefully handled. Connection failure was handled in OpenEdge, pushed back to the first OpenEdge procedure, pushed back to the Java thread, and there it was dropped silently.

Error status and exceptions are not there to bother the programmer, it's just that something is wrong. So unless you're absolutely sure that you want to skip this error (and you should document that in your code), just let the exception bubble up (with a RuntimeException if possible in Java) or don't use NO-ERROR in Progress if you don't know what to do with it.

4

Quick and easy setup of Mercurial server on Windows

Installing Mercurial on a Linux server is a matter of minutes (depending on your Linux distro). But I had to install it on a Windows server, and there are subtle pitfalls you're likely to encounter when doing that. This post is by no mean a full and detailed installation process for every configuration, it will just focus on a simple install.


Step 1 : HTTPD install
HTTPD is one of the widely used HTTP server. The Windows version can be downloaded from here. I'm using the 2.2.17 Win32 Binary including OpenSSL 0.9.8o. Choosing a typical install will use C:\Program Files (x86)\Apache Software Foundation\Apache2.2 as the default directory. The only specific step during install is this screen :
Just fill with appropriate values depending on your network.

Step 2 : Python install
Python is needed by Mercurial. You always have to use the same Python version as the one used by Mercurial. The current Mercurial version (1.7.5) is still using 2.6, so download this version from Python website. Even if you're running Win x64, download the x86 version as I encountered some bugs with the 64 bits package (no idea why). Use the default settings for everything (especially installation directory).

Step 3 : Mercurial install
Mercurial compiled for Windows can be downloaded from here. Never use TortoiseHg to setup a Mercurial server, it won't work correctly (and easily). Always download *.win32-py2.6.exe packages, they're easier to setup.
Setup should detect your Python version and so compile Mercurial with Python 2.6.

Step 4 : Create directory structure
This test installation will use 3 differents directories to host repositories. We will use subfolders of C:\Repositories , named /Production, /QA and /Dev
We will keep them empty for now, just create this structure.

Step 5 : HTTPD setup
Create a new file called hgweb.cgi in C:\Program Files (x86)\Apache Software Foundation\Apache2.2\cgi-bin with this content :
#!C:/Python26/python.exe -u

# See also http://mercurial.selenic.com/wiki/PublishingRepositories
# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "C:/Program Files (x86)/Apache Software Foundation/Apache2.2/cgi-bin/hgweb.config"

# Uncomment and adjust if Mercurial is not installed system-wide:
# import sys; sys.path.insert(0, "SomeDirectory")

# Uncomment to send python tracebacks to the browser if an error occurs:
import cgitb; cgitb.enable()

from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)
Create a new file called hgweb.config in C:\Program Files (x86)\Apache Software Foundation\Apache2.2\cgi-bin with this content :
[paths]
/Production = C:/Repositories/Production/*
/QA = C:/Repositories/QA/*
/Dev = C:/Repositories/Dev/*
[web]
allow_push = *
style = monoblue
contact = mercurial@riverside-software.fr
push_ssl = false
 Add this line in C:\Program Files (x86)\Apache Software Foundation\Apache2.2\conf\httpd.conf in the <IfModule alias_module=""> section :

ScriptAlias /hg "C:/Program Files (x86)/Apache Software Foundation/Apache2.2/cgi-bin/hgweb.cgi
This line allows HTTPD to map the /hg query directly to Mercurial (instead of calling /cgi-bin/hgweb.cgi).
Don't forget to restart HTTPD.

Step 6 : Test !
Open your web browser at http://localhost/hg and voilĂ  ! You should have this page :

Step 7 : Enjoy
You can now import/clone your repositories
0

PCT 0.17 is released

I just released a new version of PCT. Almost 16 months after 0.16, it was time to have another standard release, as continuous integration is not something you can rely on in the long term.

Download it from here !

Included is the changelog :
 * Several improvements on PLReader. Still one bug remaining when extracting adecomm.pl
 * Removed PLExtract task, in favor of PLFileSet type which can be nested in any FileSet capable task
   Only in read tasks, PCTLibrary still needs to be used when creating libraries
 * Replaced CRCDifferent with RCodeSelector. Now able to use MD5 to compare r-code
 * Another bug when XREF when importing XREF on classes
   Bug reported by Sascha Hofmann
 * Added environment variables to PCT tasks
 * If dlcHome attribute isn't set, try to use DLC property then DLC environment variable
 * PCTConnection was not allowing user name with no password
   Enhancement by Sascha Hofmann
 * Upgrading to ANT 1.8
   Edit : To 1.8.1
   Edit : To 1.8.2
 * Changed the way $DLC/version is parsed
   Thanks to Matt Baker for reporting bug and additional infos
 * Adding languages and textSegGrowth attributes to PCTCompile and PCTCompileExt tasks
 * Corrected warning message when compiling classes
 * antlib.xml for pct namespace was not included in JAR file
 * Updated documentation for pct namespace
 * Changed setPropath to addPropath in PCTRun, so that multiple propath definitions can be combined
 * Cleanup when tasks create a new subtask instance. Fixed a bug when using pct namespace
 * GC Bug #1 : upgraded pct/_dmpincr.p to 10.2B
 * Added PCTVersion task
 * If pctX.pl is not available for your version of Progress, fall back to source code
   Compilation licence required in this case.
 * Reads PCT-SRC property from the command line, to force source code instead of compiled version
 * GC Bug #2 : more detailed error messages during connection (patch by Dan Dragut)
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