init.d-style jruby daemon

jruby-daemon.sh

#!/bin/bash
# Junegunn Choi ([email protected])
# 2011/09/02-

# init.d-style daemon script for JRuby with spoon gem.

APP_NAME=sleeper
APP_PATH=/Users/jg/github/jruby-daemon/sleeper.rb

JRUBY=/Users/jg/.rvm/rubies/jruby-1.6.4/bin/ruby
export GEM_HOME=~/.rvm/gems/jruby-1.6.4

LOGFILE=/var/log/$APP_NAME.log
ERRFILE=/var/log/$APP_NAME.err
PIDFILE=/var/run/$APP_NAME.pid

# ---------------------------------------------------
WRAPPER='
require "rubygems";
require "spoon";
pid = Spoon.spawnp(*ARGV[1..-1]);
File.open(ARGV[0], "w") { |f| f << pid };
'
COMMAND="$JRUBY -e '$WRAPPER' '$PIDFILE' '$JRUBY' '$APP_PATH'"

start_daemon() {
	if [ -e "$PIDFILE" ]; then
		echo "PID file already exists."
		exit 1
	else
		echo "Starting $APP_NAME."
		eval $COMMAND >> $LOGFILE 2>> $ERRFILE
		echo $?
	fi
}

stop_daemon() {
	if [ -e "$PIDFILE" ]; then
		echo "Stopping $APP_NAME."
		PID=`cat $PIDFILE`
		while [ 1 ]; do
			kill -TERM $PID 2> /dev/null
			sleep 1
			[ `ps $PID 2> /dev/null | grep $PID | wc -l` -eq 0 ] && break
		done
		rm $PIDFILE
	else
		echo "PID file not found."
		exit 1
	fi
}

case $1 in
	start)
		start_daemon
	;;
	stop)
		stop_daemon
	;;
	restart)
		stop_daemon
		sleep 1
		start_daemon
	;;
esac
exit 0