Madeleine

It brings back memories

What is Madeleine?

Madeleine is a Ruby implementation of Object Prevalence, that is, transparent persistence of business objects using command logging and complete system snapshots.

Madeleine's design is based on Prevayler, the original Java implementation of object prevalence.

Requirements: Ruby 1.8.1

News

Madeleine 0.7.3 released on June 11, 2006:

Fixed missing binmode, causing self-test to fail on win32.

Madeleine 0.7.2 released on May 29, 2006:

An automatic class with no methods would cause an error.
System sanity check at first use.
Now creates full path to storage files, not just the last directory (reported by Wayne Vucenic).

Madeleine 0.7.1 released on August 22, 2004:

ZMarshal changed to work around Zlib bug.
automatic_read_only fixed when intercepted class is inherited from

Madeleine 0.7 released on July 23, 2004:

Broken clock unit test on win32 fixed.
AutomaticSnapshotMadeleine detects snapshot format on recovery
Snapshot compression with Madeleine::ZMarshal
YAML snapshots supported for automatic commands
SOAP snapshots supported for automatic commands
Read-only methods for automatic commands

Madeleine 0.6.1 released on March 30, 2004:

Bug fix: Use binary mode for I/O, fixes log replay on mswin32 port of Ruby (Patch from Martin Tampe)

Madeleine 0.6 released on March 28, 2004:

Changed license to BSD
Added a RubyGem specification
Re-designed initialization (but still backward-compatible)
Bug fix: Fixed use of finalized object's id in AutomaticSnapshotMadeleine

Madeleine 0.5 released on August 31, 2003:

Bug fix: Log order on recovery was wrong on some platforms (reported by IIMA Susumu)
No longer requires the system clock to always increase
Shared locks for queries

Where do I get it?

If you have RubyGems installed, then just do this to get the latest version:

gem install madeleine

Otherwise, you can download from RubyForge.

Download old versions from Sourceforge.

You can always get the very latest code through SVN at RubyForge.

Documentation

There is some documentation for Madeleine itself:

Then there is the Prevayler site, with some useful information (and a lot of hype and flaming) about object prevalence in general.

Contact

Questions, bug reports, complaints, patches? Use the mailing list:

madeleine-devel

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, Assaph Mehr, Håkan Råberg, IIMA Susumu, Martin Tampe, Jon Tirsén and Wayne Vucenic

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!