#!/bin/bash
# Application constants.
serviceName="l2clientdat"
appJar="L2ClientDat.jar"
appLockFile=/tmp/${serviceName}
appOutputLog=./${serviceName}.log
# Color constants.
setColorGreen="\\033[1;32m"
setColorRed="\\033[1;31m"
setColorDefault="\\033[0;39m"
# Safety check, in case user wants to run the script from an inappropriate working directory.
if [ $(ls $(pwd) | grep -ci $appJar) -eq 0 ]; then
echo "Before you run $appJar you must switch to the directory where it is placed!"
exit 1
fi
# A general function to start the application.
# & is mandatory for this function, otherwise application won't go into the background.
function startApp() {
# Linux basics.
if [ $UID -eq 0 ]; then
echo "Running the application with root user may cause lethal security issues. Please dedicate a user for your application."
exit 1
fi
# Check whether lock file is present.
if [ -f $appLockFile ]; then
echo "Lock file is present, because service '${serviceName}' is already running."
exit 1
fi
# Create lock file.
touch $appLockFile
# Inform the user.
echo "Service '${serviceName}' is started in background."
# Start the application finally.
java -Xms512m -Xmx4024m -cp ./data/lib/* -jar $appJar > $appOutputLog 2>&1
# If exit code is restart, then restart the application, otherwise bye-bye!
if [ $? -eq 2 ]; then
stopApp
sleep 1
startApp &
else
stopApp
fi
}
# A general function to stop the application. Force kill is prohibited here!
function stopApp() {
# Remove the lock file.
rm -f $appLockFile
# Get the application PID.
local appPID=$(ps x | grep $appJar | grep -v grep | awk '{print $1}')
# If PID exist, then kill the application.
if [[ ! -z $appPID ]]; then
kill $appPID
fi
# Inform the user.
echo "Service '${serviceName}' is stopped."
}
# Check the status running of the application.
function statusApp() {
# Get the application PID.
local appPID=$(ps x | grep $appJar | grep -v grep | awk '{print $1}')
# Inform user whether service is running or not.
echo -ne "[ "
if [[ ! -z $appPID ]]; then
echo -ne $setColorGreen
echo -ne "ONLINE"
echo -ne $setColorDefault
echo " ] Service '${serviceName}' is running."
else
echo -ne $setColorRed
echo -ne "OFFLINE"
echo -ne $setColorDefault
echo " ] Service '${serviceName}' is NOT running."
# In case life happens. Unexpected outage, etc...
[ -f $appLockFile ] && echo "However the lock file '${appLockFile}' is present, possibly an unexpected shutdown event happened recently. Please use '${0} stop' to cleanup."
fi
}
# A simple function to show the usage of this service.
function helpApp() {
echo "Usage: $0 (start|stop|status|view_log)"
}
# User choice below.
case $1 in
'start')
# Yes, as I said above, the & is intentional.
startApp &
;;
'stop')
stopApp
;;
'status')
statusApp
;;
'view_log')
# Displays the content of the application log.
cat $appOutputLog
;;
*)
helpApp
;;
esac
:Sarcastic1::big troll:
