#--
# Copyright (c) 2007-2009, Tomaso Tosolini and John Mettraux, OpenWFE.org
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# Made in Italy.
#++


require 'openwfe/engine/engine'
require 'openwfe/extras/expool/db_expstorage'
require 'openwfe/extras/expool/db_errorjournal'


module OpenWFE::Extras

  #
  # A simple DbPersistedEngine.
  #
  class DbPersistedEngine < OpenWFE::Engine

    protected

    #
    # Overrides the method already found in Engine with a persisted
    # expression storage
    #
    def build_expression_storage

      #init_service(:s_expression_storage, DbExpressionStorage)
      init_storage(DbExpressionStorage)
    end

    #
    # Uses a file persisted error journal.
    #
    def build_error_journal

      init_service(:s_error_journal, DbErrorJournal)
    end
  end

  #
  # This OpenWFEru engine features database persistence (thanks to
  # ActiveRecord), with a cache (for faster read operations) and a
  # threaded wrapper (for buffering out unecessary write operations),
  # hence it's fast (of course its's slower than in-memory storage.
  #
  class CachedDbPersistedEngine < DbPersistedEngine

    protected

    def build_expression_storage

      init_storage(ThreadedDbExpressionStorage)
    end
  end
end