Madeleine is a Ruby implementation of Object Prevalence: Transparent
persistence of business objects using command logging and complete
system snapshots.

https://github.com/ghostganz/madeleine

Madeleine's design is based on Prevayler, the original Java
prevalence layer.


Usage:

    require 'madeleine'

    # Create an application as a prevalent system

    madeleine = SnapshotMadeleine.new("my_example_storage") {
      SomeExampleApplication.new()
    }

    # Do modifications of the system by sending commands through
    # the Madeleine instance. A command is an object with a suitable
    # "execute(system)" method.

    madeleine.execute_command(command)


Requirements:

    * Ruby 1.8.7 or later

Contact:

    Homepage:
    https://github.com/ghostganz/madeleine

License:

    BSD (see the file COPYING)

Credits:

    Anders Bengtsson   -   Prevalence core impl.
    Stephen Sykes      -   Automatic commands impl.

    With the help of patches, testing and feedback from:

    Steve Conover, David Heinemeier Hansson, Johan Lind, Håkan Råberg,
    IIMA Susumu, Martin Tampe and Jon Tirsén

    Thanks to Klaus Wuestefeld and the Prevayler developers for the
    model of this software; to Minero Aoki for the installer; to Matz and
    the core developers for the Ruby language!