== SmartSessionStore

A session store that avoids the pitfalls usually associated with concurrent access to the session (see 
http://about.82ask.com/2007/05/01/race-conditions-in-rails-sessions-and-how-to-fix-them/)

Derived from SqlSessionStore, see http://railsexpress.de/blog/articles/2005/12/19/roll-your-own-sql-session-store

== Step 1

Generate your sessions table using rake db:sessions:create

== Step 2

Add the code below after the initializer config section:

    ActionController::CgiRequest::DEFAULT_SESSION_OPTIONS.
      update(:database_manager => SmartSessionStore)

Finally, depending on your database type, add

    SmartSessionStore.session_class = MysqlSession
or

    SmartSessionStore.session_class = PostgresqlSession
or
    SmartSessionStore.session_class = OracleSession

after the initializer section in environment.rb

== Step 3 (optional)

If you want to use a database separate from your default one to store
your sessions, specify a configuration in your database.yml file (say
sessions), and establish the connection on SqlSession in
environment.rb:

   SqlSession.establish_connection :sessions


== IMPORTANT NOTES

1. You will need the binary drivers for Mysql or Postgresql.
   These have been verified to work:

   * ruby-postgres (0.7.1.2005.12.21) with postgreql 8.1
   * ruby-mysql 2.7.1 with Mysql 4.1
   * ruby-mysql 2.7.2 with Mysql 5.0

2. Tests have been done with SqlLiteSession, SqlSession and MysqlSession. I don't have access to Oracle or Postgresql 
and so have not been able to test those. Feedback would be very much appreciated