#!/bin/sh
# -*- sh -*-

: << =cut

=head1 NAME

jenkins_jstats - Plugin to measure jstat from jenkins.war

=head1 AUTHOR

Contributed by Holger Levsen

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=cut

. $MUNIN_LIBDIR/plugins/plugin.sh

if [ "$1" = "autoconf" ]; then
	echo yes
	exit 0
fi

STATEFILE=$MUNIN_PLUGSTATE/$(basename $0)

# delete statefile if it's older than ${jenkins_update_interval} set in /etc/munin/plugin-conf.d/jenkins
if test $(find $STATEFILE -mmin +${jenkins_update_interval} 2>/dev/null) ; then
	rm -f $STATEFILE
fi

if [ -f $STATEFILE ] && [ "$1" = "" ] ; then
	cat $STATEFILE
	exit 0
fi

JENKINS_PID=$(jps |grep jenkins.war|cut -d "j" -f1)
JOB_PREFIXES=$(for i in $(jstat -gc $JENKINS_PID | head -1) ; do echo -n "$i " ; done)
if [ "$1" = "config" ]; then
	echo 'graph_title jenkins.war jstat -gc (mostly KB shown)'
	echo 'graph_args --base 1000 -l 0 '
	echo 'graph_scale no'
	echo 'graph_vlabel jenkins.war jstat -gc'
	echo 'graph_category jenkins'
	draw=AREA
	for PREFIX in $JOB_PREFIXES ; do
		echo "jenkins_jstats_$PREFIX.label $PREFIX"
		case $PREFIX in
			S0C)	INFO="Current survivor space 0 capacity (KB)" ;;
			S1C)	INFO="Current survivor space 1 capacity (KB)" ;;
			S0U)	INFO="Survivor space 0 utilization (KB)" ;;
			S1U)	INFO="Survivor space 1 utilization (KB)" ;;
			EC)	INFO="Current eden space capacity (KB)" ;;
			EU)	INFO="Eden space utilization (KB)" ;;
			OC)	INFO="Current old space capacity (KB)" ;;
			OU)	INFO="Old space utilization (KB)" ;;
			PC)	INFO="Current permanent space capacity (KB)" ;;
			PU)	INFO="Permanent space utilization (KB)" ;;
			YGC)	INFO="Number of young generation GC Events" ;;
			YGCT)	INFO="Young generation garbage collection time" ;;
			FGC)	INFO="Number of full GC events" ;;
			FGCT)	INFO="Full garbage collection time" ;;
			GCT)	INFO="Total garbage collection time" ;;
			*)	;;
		esac
		echo "jenkins_jstats_$PREFIX.info $INFO"
	done
	exit 0
fi

COUNTER=1
VALUES=$(jstat -gc $JENKINS_PID | tail -1)
for PREFIX in $JOB_PREFIXES ; do
	NR=$( (for i in $VALUES ; do echo $i ; done ) | head -$COUNTER | tail -1)
	echo "jenkins_jstats_$PREFIX.value $NR" | tee -a $STATEFILE
	COUNTER=$((COUNTER+1))
done