getpercentavailabilityinwindow.sql

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--
--    Copyright (C) 1999-2001 Oculan Corp.  All rights reserved.
--
--    This library is free software; you can redistribute it and/or
--    modify it under the terms of the GNU General Public
--    License as published by the Free Software Foundation; either
--    version 2.1 of the License, or (at your option) any later version.
--
--    This library is distributed in the hope that it will be useful,
--    but WITHOUT ANY WARRANTY; without even the implied warranty of
--    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
--    General Public License for more details.
--
--    You should have received a copy of the GNU General Public
--    License along with this library; if not, write to the Free Software
--    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
--
-- --------------------------------------------------------------------------
--
-- The following PL/PgSQL function is used to calculate the percentage 
-- availability of a (Node, IP Address, Service) tuple between two dates. 
-- The X date is the time closest to the current time. The Y date must
-- be older than the X date. The downtime between the two dates are
-- calculated based on all matching tuples using the already written 
-- getOutageTimeInWindow. These function return the percentage availability 
-- of the tuple during the time frame. Percentage Availability returned will 
-- be 100%, if the X < Y, since getOutageTimeInWindow returns 0.
--
-- @author Jacinta Remedios <[e-mail]>
--
-- Dependencies: getOutageTimeInWindow() that gets the outage time for the tuple.
-- 
-- $1	The node identifier
-- $2	The ipAddress
-- $3	The service identifier
-- $4	X time. This is the time that is closest to current
-- $5	Y time. This is the time that is furtherest from current.
--
-- In time:  Now >= X >= Y 
-- (X - Y) is the window for which outage is calculated
--
--
DROP FUNCTION getPercentAvailabilityInWindow(integer,varchar(16),integer,float8,float8);
DROP FUNCTION getPercentAvailabilityInWindow(integer,varchar(16),integer,text,text);
DROP FUNCTION getPercentAvailabilityInWindow(integer,varchar(16),integer,timestamp without time zone,timestamp without time zone);

CREATE FUNCTION getPercentAvailabilityInWindow(integer,varchar(16),integer,timestamp without time zone,timestamp without time zone)
	RETURNS float8 AS '
   DECLARE
	nid ALIAS FOR $1;
	ipid ALIAS FOR $2;
	sid ALIAS FOR $3;
	xtime ALIAS FOR $4;
	ytime ALIAS FOR $5;
	downtime float8;
   BEGIN
	downtime := getOutageTimeInWindow(nid, ipid, sid, xtime, ytime);
	IF xtime > ytime THEN
		RETURN 100 * (1 - (downtime / (EXTRACT(EPOCH FROM (xtime - ytime))* 1000)));
	ELSE
		RETURN 100 * (1 - (downtime / (EXTRACT(EPOCH FROM (ytime - xtime))* 1000)));
	END IF;
   END;
' LANGUAGE 'plpgsql';