module Timeseries
	module Hoarder
		class Table
			def initialize(db, table_name, table_schema = "public")
				@table_name = table_name
				@table_schema = table_schema

				@db = db
				@pg = @db.pg

				@created = false

				ensure_table_exists
			end

			def ensure_table_exists
				return if @created

				@pg.transaction do
					@pg.exec("SELECT pg_advisory_lock(0)")

					r = @pg.exec_params("SELECT 1 FROM information_schema.tables WHERE table_name = $1 AND table_schema = $2", [@table_name, @schema_name])

					if r.num_tuples >= 1
						@created = true
						return
					end

					table_creation

					@created = true
				end
			end

			def table_creation
				raise "No table creation string method provided!"
			end
		end
	end
end