Bash - use 1 stop script for multiple similar services, and kill the correct process only - linux

Question

I have multiple processes running as services on a machine
Before moving from 1 process/service to multiple ones, I used the following script to stop my service
#!/bin/sh
SIGNAL=${SIGNAL:-TERM}
PIDS=$(ps ax | grep -i 'datastream' | grep java | grep -v grep | awk '{print $1}')
if [ -z "$PIDS" ]; then
echo "No Brooklin server to stop"
exit 1
else
kill -s $SIGNAL $PIDS
fi
The issue now is that this script kills all processes of this type if invoked as a service stop command
My services are called for example service-A, service-B, service-C. If I send a service service-C stop command, the current script will stop all 3 processes.
I would like to make the script use the provided service name to determine which process to stop (I can grep A/B/C from the process output to ps, but I haven't managed to tell it how to stop only the process given in the service stop command.
Does anyone have experience handling something similar?

Answer 1

You can try something like below while starting your application which can store your PID in a static file and then you can use the same file to kill the process.
Pasting below one of my start - stop script which I have used in past for churning up multiple processes.
Start Script :-
#!/bin/bash
export PORT=$1
. /application/setEnv.sh
/java/jdk1.8.0_152/bin/java -Xms512m -Xmx2G -XX:+DisableExplicitGC -jar /application/api-1.0-0-all.jar </dev/null >>$LOGDIR/service$PORT.log 2>&1 &
echo $! > /application/service$PORT.pid
disown $!
Stop Script :-
#!/bin/bash
PORT=$1
PID=`cat /application/service$PORT.pid`
if [ ! -z "$PID" ]; then
rm /application/service$PORT.pid
kill -9 $PID >/dev/null 2>&1
if [ $? -gt 0 ]; then
echo "PID file found but no matching process was found. Stop aborted."
exit 1
fi
else
echo "PID file is empty and has been ignored."
fi
mv /application/logs/service$PORT.log /application/logs/service$PORT.log`date +%d%m%Y%H%M%S`
Only change which I can think of is the replace my port utilisation logic viz. $PORT with your service names viz. A/B/C.