/
updatejob.rb
115 lines (100 loc) · 3.63 KB
/
updatejob.rb
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# Copyright (C) 2012 Directed Edge, Inc.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
require 'tempfile'
module DirectedEdge
class UpdateJob
HEADER = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<directededge version=\"0.1\">"
FOOTER = "</directededge>\n"
def initialize(database, mode)
raise ArgumentError.new unless [ :replace, :update ].include?(mode)
@database = database
@mode = mode
@add_file = temp(:add)
@remove_file = temp(:remove) if mode == :update
end
def item(id, &block)
item = Item.new(@database, id)
block.call(item) if block
validate_updates(item)
@add_file.puts(item.to_xml(:add))
@remove_file.puts(item.to_xml(:remove)) if @mode == :update
item
end
def run
(@mode == :replace ? [ @add_file ] : [ @add_file, @remove_file ]).each do |file|
file.puts(FOOTER)
file.flush
file.rewind
end
if @mode == :replace
@database.resource.put(@add_file)
elsif @mode == :update
@database.resource[:update_method => :add].post(@add_file)
@database.resource[:update_method => :subtract].post(@remove_file)
end
end
def self.run(*args, &block)
job =
if args.length == 2
raise ArgumentError.new unless args.first.is_a?(Database)
self.new(args.first, args.last)
elsif args.length == 3
self.new(DirectedEdge::Database.new(args[0], args[1]), args[2])
else
raise ArgumentError.new
end
block.call(job)
job.run
end
private
class Item < DirectedEdge::Item
attr_reader :data
def to_xml(add_or_remove)
method = add_or_remove == :add ? :add_queue : :remove_queue
(method == :remove_queue && !queued?(:remove)) ? '' : super(method, false)
end
private
def load
raise StandardError.new('You can\'t call load on Updater::Item')
end
def save
raise StandardError.new('You can\'t call save on Updater::Item')
end
end
def validate_updates(item)
if @mode == :replace
item.data.values.each do |v|
if !v.remove_queue.empty?
message = 'You can\'t remove values while the updater is in :replace mode'
raise StandardError.new(message)
end
end
end
end
def temp(action)
file = Tempfile.new("#{@database.name}-#{action}")
file.puts(HEADER)
file
end
end
end