##
# \file

# To each interface a set of caller functions exist, that take an instance
# of an object and then in turn call the implementation for the class of
# this object. If there is none within the class it looks into its
# parent class and so forth.
#
# This is somewhat similar to late binding in real OOP languages, but
# by far not so elaborated. This is not a real object oriented language
# and will surely never ever provide all features these have.
#
# That said it has proven very usefull for me to orgnize code and prevent
# code duplication.
#
# \author	Georg Hopp
#
# \copyright
# Copyright © 2014 Georg Hopp
#
# This program 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 3 of the License, or
# (at your option) any later version.
#
# This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
#

gather_uptime_info() {
	[ -z "${UPTIME}" ] || return

	export UPTIME=""
	export LOAD_1=""
	export LOAD_5=""
	export LOAD_15=""

	local CALC_LOAD_AWK='{
		print "LOAD_1=\"" $1 "\";LOAD_5=\"" $2 "\";LOAD_15=\"" $3 "\";";
		for(i=1; i<4; i++) {
			if($i<=0.0) {
				load="LOW"
			} else {
				inv_load=ncpus/$i;
				if (inv_load > (ncpus/2)) {
					load="LOW";
				} else {
					load="MODERATE";
				}
				if (inv_load <= 0) load="HIGH";
			}

			if(i==1) { classes=classes "LOAD_1_" load " " }
			if(i==2) { classes=classes "LOAD_5_" load " " }
			if(i==3) { classes=classes "LOAD_15_" load " "; }
		}
		print "set_class " classes ";";
	}'

	has_class "Linux" && {
		eval $(${AWK} -v ncpus=${NCPUS} "${CALC_LOAD_AWK}" </proc/loadavg)
	}

	has_class "FreeBSD" && {
		local N='\([0-9]*\.[0-9]*\)'
		eval $(${SYSCTL} vm.loadavg |\
			${SED} 's/^.*{ '"${N}"' '"${N}"' '"${N}"'.*/\1 \2 \3/' |\
			${AWK} -v ncpus=${NCPUS} "${CALC_LOAD_AWK}")
	}

	export UPTIME LOAD_1 LOAD_5 LOAD_15
}

# vim: set ts=4 sw=4: