#!/bin/bash

export JAVA="/usr/lib64/java/bin/java"
export CASSANDRA_HOME="/opt/apache-cassandra"
export CASSANDRA_CONF="$CASSANDRA_HOME/conf"
export CASSANDRA_INCLUDE="$CASSANDRA_HOME/tools/bin/cassandra.in.sh"

PRG="cassandra"
DIR="/opt/apache-cassandra/bin/"
PID_DIRECTORY="/var/run"
PID_FILE="$PID_DIRECTORY/$PRG.pid"

function isRunning() {
[[ ! -f "$PID_FILE" ]] && return 1
PID="$(<"$PID_FILE")"
[[ -z "$PID" ]] && return 1
[[ ! $(ps -p $PID | grep $PID) == "" ]] && RV=0 || RV=1
return $RV
}

function status() {
isRunning
STATUS=$?
if [[ $STATUS -eq 0 ]]; then
    echo -e "Service $PRG is running"
else
    echo -e "Service $PRG is not running."
fi
}

function start() {
isRunning
STATUS=$?
if [[ $STATUS -eq 0 ]]; then
    echo -e "Service $PRG is already running."
else
    echo -e "Start service $PRG"
    $DIR$PRG -p $PID_FILE > /dev/null 2>&1 &
fi
}

function stop() {
isRunning
STATUS=$?
if [[ $STATUS -eq 0 ]]; then
    echo -e "Stop service $PRG"
    PID="$(<"$PID_FILE")"
    kill $PID
    rm "$PID_FILE"
else
    echo -e "Service $PRG not running."
fi
}

case $1 in 
    start)
        start
        ;;
    stop)
        stop
        ;;
    restart)
        start
        sleep 1
        stop
        ;;
    status)
        status
        ;;
    *)   	
        echo "Usage: $0 {start|stop|restart|status}"
        exit 1
        ;;
esac

exit 0