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#--
# Copyright (c) 2005-2013, John Mettraux, jmettraux@gmail.com
#
# 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 Japan.
#++
require 'ruote/storage/base'
module Ruote
#
# This storage allows for mixing of storage implementation or simply
# mixing of storage physical backend.
#
# opts = {}
#
# dashboard =
# Ruote::Dashboard.new(
# Ruote::Worker.new(
# Ruote::CompositeStorage.new(
# Ruote::FsStorage.new('ruote_work', opts),
# 'msgs' => Ruote::HashStorage.new(opts))))
#
# In this example, everything goes to the FsStorage, except the messages
# (msgs) that go to an in-memory storage.
#
class CompositeStorage
include StorageBase
def initialize(default_storage, storages)
@default_storage = default_storage
@storages = storages
end
# A class method 'delegate', to tell this storage how to deal with
# each method composing a storage.
#
# Followed by a list of 'delegations'.
#
def self.delegate(method_name, type=nil)
if type == nil
define_method(method_name) do |*args|
storage_for(args.first['type']).send(method_name, *args)
end
elsif type.is_a?(Fixnum)
define_method(method_name) do |*args|
storage_for(args[type]).send(method_name, *args)
end
else
type = type.to_s
define_method(method_name) do |*args|
storage_for(type).send(method_name, *args)
end
end
end
delegate :put
delegate :get, 0
delegate :get_many, 0
delegate :delete
delegate :reserve
delegate :ids, 0
delegate :purge_type!, 0
delegate :empty?, 0
delegate :put_msg, :msgs
delegate :get_msgs, :msgs
delegate :put_schedule, :schedules
delegate :get_schedules, :schedules
delegate :delete_schedule, :schedules
delegate :find_root_expression, :expressions
delegate :expression_wfids, :expressions
delegate :get_trackers, :variables
delegate :get_engine_variable, :variables
delegate :put_engine_variable, :variables
# The dilemma for the CompositeStorage with add_type is "to which
# real storage should the new type get added". The solution: do nothing.
#
def add_type(type)
end
TYPES = %w[
variables
msgs
expressions
errors
schedules
configurations
workitems
]
protected
def storage_for(type)
@storages[type] || @default_storage
end
end
end