My company’s policy for Perl in production is more or less:
- Production Perl code must run under the vendor supplied Perl
- Sysadmins will not install or upgrade Perl modules
- We are allowed to install any module from CPAN
The two production platforms we target are RHEL5.5 for which vendor Perl is an uncomfortable 5.8.8 and RHEL6.2 which has a much more comfortable Perl 5.10.1.
Our development boxes do not have access to the internet proxies which makes things a little more difficult than they should be.
David Golden lists 5 ways of installing module prerequisites here.
Installing Perl Modules – Method #6
The method I use, given the constraints above is to discover the prerequisites by running
Makefile.PL (or Build.PL) and download the prerequisites by hand recursively.
This approach is straightforward once you have the correct Makefile.PL incantation.
perl -I$PERL_LIB Makefile.PL PREFIX=$PERL_LIB LIB=$PERL_LIB PERL="/usr/bin/perl -I$PERL_LIB"
Note: You could set/override environment variable
PERL5LIB instead of adding the -I arguments which is probably better, but aesthetically, I prefer the version above.
Posted in Perl | 6 Comments »
Some interesting discussion on roles vs inheritance on SillyMoose’s blog (h/t to Planet Moose)
The executive summary:
- Roles are semantically safer than multiple inheritance because methods from the roles are loaded into the class at compile time and any name clashes are picked up then.
- Roles cannot be instantiated.
Posted in Perl | Tagged perlnotes | Leave a Comment »
In no particular order…
|Speed or memory usage are sufficiently important
|You’re a Windows shop or you hate Java
|You are writing a GUI and you’re allergic to Web Apps
||C# (or Java)
|You think in threads
||Erlang or Golang
|You like Lisp
||Clojure or Racket
|You’re a web consultant
|You prefer dynamic typing to static typing
||Perl, Python or Ruby
Posted in Programming | 2 Comments »
I’ve been feeling hard done by with the Python folks talking down Perl and all this time apparently it’s been us Perl guys who think Python is a crippled toy.
… And I went off and read about nested functions (or the lack thereof) in Perl and understand why limited lambda seems like a crippling blow to Perlistas.
I’ve never seen anyone say that Perl is a superior programming language to Python, because of limited lambdas, deliberately restricted recursion or anything else.
Good humoured ribbing aside (depending on where you sit I guess), I believe that Perl and Python sit at approximately the same level on the language power continuum. I mean, they’re similar enough to be two different people’s take on the same underlying language (I kid, I kid!).
I do think that Perl is strictly more powerful than Python (with e.g. parser flexibility, symbol-table hackability). However, in most cases this additional power isn’t something you need. The main places I can think of where it has been used legitimately is where stuff that is built-in to Python has been added by Perl at the library level.
Posted in Perl | 8 Comments »
Capturing a couple of old links so I don’t lose them:
An aside… in my industry, we’re probably not going to be seeing any of this until 2020 or so. We’re still stuck on 5.10 (RHEL6).
Posted in Perl | Tagged perlnotes | 2 Comments »
Just when I was thinking about web apps another relevant post pops up on Ironman.
Posted in Perl | Tagged perlnotes, webdev | Leave a Comment »
I’m looking for advice on developing a standalone web app for Windows. That is, the server side would be running locally.
So far I’ve got notes on Perl and necessary modules.
- Strawberry Perl
- DBI and DBD::SQLite
- Plack and Mojolicious or Dancer
- AnyEvent and Twiggy ?
I’m planning to remove MinGW / and the compiler to make the final package smaller.
Here is the list of installation software.
At the moment I’m leaning towards NSIS for no particular reason.
What I’m thinking is that the installation script will check for the existence of C:\Strawberry. Then it will run the Perl it finds there.
- If it can’t find the directory, it can install it.
- If the directory exists and the Perl is good, use it.
- If the directory exists and the Perl is not good, abort with an error message.
Any input welcome.
Posted in Perl | Tagged perlnotes | 4 Comments »