require "article"
class BBS
	include Enumerable
	def initialize( datafile )
		@datafile = datafile
		@list = []
	end
	def get()
		File.open( @datafile, "r" ) do |file|
			file.flock( File::LOCK_SH )
			file.each do |line|
				@list.push( Article.new( line ) )
			end
		end
	end
	def post( *args )
		File.open( @datafile, "r+" ) do |file|
			file.flock( File::LOCK_EX )
			file.each do |line|
				@list.push( Article.new( line ) )
			end
			file.rewind()
			file.truncate( 0 )
			@list.unshift( Article.post( *args ) )
			@list.each do |article|
				file.puts( article.to_s )
			end
		end
	end
	def size
		@list.size
	end
	def each
		@list.each do |article|
			yield article
		end
	end
end
class BBSError < StandardError
end