Druid simple execution wrapper

druid.sh

#!/bin/bash

_LOG_DIR=/var/log/druid
_PID_DIR=/var/run/druid

function start {
        if [ -f $_PID_DIR/$1.pid ]; then
                echo "Component $1 already running"
        else
                if [ -f $_LOG_DIR/$1.out ]; then
                        mv $_LOG_DIR/$1.out "$_LOG_DIR/$1.out-$(date +%Y%m%d%H%M%S)"
                fi
                nohup java $(cat conf/druid/$1/jvm.config | xargs) -cp conf/druid/$1:conf/druid/_common:lib/* io.druid.cli.Main server $1 2> $_LOG_DIR/$1.out &
                echo $! > $_PID_DIR/$1.pid
        fi
}

function stop {
        if [ ! -f $_PID_DIR/$1.pid ]; then
                echo "Component $1 not running"
        else
                kill $(cat $_PID_DIR/$1.pid)
                rm -f $_PID_DIR/$1.pid
        fi
}

if [ $# -lt 1 ]; then
    echo "Possible options: ./druid {start|stop} [COMPONENT1 [COMPONENT2...]]"
    echo "Components: {broker|coordinator|historical|middleManager|overlord}"
    exit 1
fi
if [ "$1" != "start" ] && [ "$1" != "stop" ]; then
    echo "Possible options: ./druid {start|stop} [COMPONENT1 [COMPONENT2...]]"
    echo "Components: {broker|coordinator|historical|middleManager|overlord}"
    exit 1
fi
_MODE=$1
shift
if [ "$#" == "0" ]; then
    _CMP=("broker" "coordinator" "historical" "middleManager" "overlord")
    for i in "${_CMP[@]}"
    do
        $_MODE $i
    done
else
    while [ "$1" != "" ]; do
        $_MODE $1
        shift
    done
fi