Working for two very important Banks, I have the need to play with Closure in Java. I have a lot of trouble looking at a good description of the subject, until I read a post on StackOverflow.

I have decided to re-cook this subject, adding a my specialized Example also.

Let’s start!

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Book review by Stefano Fago:
This book introduce one of most interesting  language of new wave of functional programming. You will find a complete overview of clojure language focusing in functional paradigm that can be the real obstacle for a standard developer. The author try to follow you on learning different subject with a lot of examples but sometimes it need more reflection and time to master some arguments and a syntax that may seems obscure. The book is a good starting point to introduce you to a new way of programming but also to learn some particulars aspect of Java. To consider a complete but not easy reading. However a book to have!

After working with unix for years, we noticed it is difficult to get a very uniform approach to unix management.

Often different Linux distributions share very little, configuration is different every time. Worst, some good unix tools (like cron, syslog, etc) can be used in a distributed environment, but are very difficult to configure, very user unfriendly and so on.

OpenPKG is a very clever stuff, because enable you to  install multiple copies of the same software with minimal effort.

CFEngine is  “an automated suite of programs for configuring and maintaining Unix-like computers.”

One of the strong ideas, is the cfengine ability to “self-repair” configuration, which brings with it the idea of “live” system.

On the FAQ we also read:

Cfengine does not inflict a model on you like most other tools for configuration. But it does inflict a security principle on you. Computers running cfengine never have to give up their autonomy to be part of a configuration collective. Pushing information to cfengine is strictly disallowed. Most users agree that this has kept cfengine users secure over the years.

Looking at “Automating UNIX and Linux Administration” you can find a deep description of these tools.

An older tool is kanif.