#!/bin/sh
#
# /etc/init.d/mds
#
# by Anton Hendriks, Metatude B.V.
#
# chkconfig: 345 95 07
# description: Metatude Dialogue Server
#
# Change the following values according to your installation:

# The user on your machine that runs the mds:
MDS_USER="mds"

# The installation dir of the MDS:
WORKDIR="/opt/mds"

# Name of the program to start:
PRG_NAME="mds"

# Description:
DESC="Metatude Dialogue Server"

# Place were we save the process ID of the MDS:
PIDFILE="/var/run/$PRG_NAME.pid"

# Check how the script was called:
case "$1" in
	start)
		echo -n "Starting $DESC: "

# Check for an existing existing file with a process ID:
		if [ -f "$PIDFILE" ]
		then

# If found, then read the content:
			PID=`cat $PIDFILE`

# If the content is empty, just remove the file
			if [ -z $PID ]
			then
				rm -f $PIDFILE
			else

# check if there is a process running that has the Process ID in the process id file:
				PID2=`ps hax | awk '{print $1}' | grep $PID`
				if [ -z $PID2 ]

# If there is no such process, just remove the pidfile:
				then
					rm -f $PIDFILE
				else

# If there is a process running, then the MDS is allready started, we exit this script:
					echo "$PRG_NAME allready running in background"
					exit 2
				fi
			fi
		fi	 

# If there was no file with a process ID, we do another check to see if the MDS was started previously:
		PID=`ps hw --User $MDS_USER | grep $PRG_NAME.lax | grep -v grep | awk 'NR==1 {print $1}'`	 
	 	if [ ! -z $PID ]

# If there is a process java running under the MDS user, we assume it is the MDS, and we exit this script:
			then
			echo "$PRG_NAME allready running in foreground"
			exit 3
		fi

# If we come here we assume the MDS is NOT running, so we start it:

# screen output (stdout and stderr) will be directed to a logfile,
# We assume you put these values in the MDS.lax file

# start the MDS:
		su $MDS_USER -c "$WORKDIR/$PRG_NAME" &

# Wait a bit for the JVM to start
		sleep 2;

# Capture the Process ID of the JVM that is running the MDS and put it in a file for future reference:
		ps hw --User $MDS_USER | grep $PRG_NAME.lax | grep -v grep | awk 'NR==1 {print $1}' > $PIDFILE

		echo $PRG_NAME

# DONE!
	;;
	stop)
		echo -n "Stopping $DESC: "

# Check for a process id file, and check if it is not empty:
		if [ -f "$PIDFILE" ]
		then
			PID=`cat "$PIDFILE"`	 
	 		if [ -z $PID ]
				then
					rm -f $PIDFILE
					echo -n "Bogus Pidfile found"
					exit 5
				else

# If the Process ID file was not empty, we stop the MDS,
					kill $PID

# Remove the Process ID file:
					rm -f $PIDFILE
					echo $PRG_NAME
					echo -n ""
			fi
		else
			echo -n "Pidfile not found"
			exit 4
		fi
# DONE!
	;;
	restart)

		$0 stop
		sleep 1
		$0 start

# DONE!
	;;
	*)

		echo "Usage: /etc/init.d/mds {start|stop|restart}" >&2
		exit 1
	;;
esac

exit 0