init-like nailgun server runner

ng.sh

#!/bin/sh -e

DESCRIPTION="JRuby Nailgun Server"
ARGS="--ng-server"

# ARGS="$ARGS -Xcompat.version=1.8"
ARGS="$ARGS -Xcompat.version=1.9"
ARGS="$ARGS -Xmn512m -Xms2048m -Xmx2048m" # heap and stack
ARGS="$ARGS -J-Djruby.thread.pooling=true" # Enable thread pooling
ARGS="$ARGS -J-Djruby.objectspace.enabled=false" # Disable ObjectSpace

## Running without nailgun
#ARGS=""
##ARGS="$ARGS --server" # server runtime
##ARGS="$ARGS --client" # client runtime
##ARGS="$ARGS --1.8" # Ruby 1.8
#ARGS="$ARGS --1.9" # Ruby 1.9
##ARGS="$ARGS -J-Xmn512m -J-Xms2048m -J-Xmx2048m" # heap and stack
##ARGS="$ARGS -J-Djruby.thread.pooling=true" # Enable thread pooling
##ARGS="$ARGS -O" # Disable ObjectSpace

get_pid() {
  ps -ewwopid,command | sed '/grep/d;/sed/d;/NGServ1er/!d;s/^\([0-9]*\).*/\1/g' | grep '[0-9]'
}

started() {
  get_pid >/dev/null
}

complain_if() {
  if $1; then
    echo "$DESCRIPTION $2." >&2
    false
  fi
}

complain_unless() {
  complain_unless "! $1" $2
}

  
start() {
  complain_if started 'is already running'
  nohup \jruby $ARGS 2>&1 | tee -a /var/log/ngserver.log >/dev/null 2>&1 &
  sleep 1
  complain_unless started 'failed to start'
}

stop() {
  complain_unless started 'is already stopped'
  kill `get_pid`
  sleep 1
  if started; then
    kill -9 `get_pid`
    sleep 1
    complain_if started 'failed to stop'
  fi
}


status() {
  if started; then
    echo "$DESCRIPTION is running" >&2
  else
    echo "$DESCRIPTION is stopped" >&2
    false
  fi
}

restart() {
  stop && start
}

condrestart() {
  started && restart
}

usage() {
  cat << EOS

  Usage: ng {start|stop|status|try-restart|condrestart|restart|usage}

  JRuby Nailgun Server

EOS
}


while [ $# -gt 0 ]; do
  case "$1" in
    start|stop|status|try-restart|condrestart|restart|usage)
      COMMAND="$1"
      ;;
    *)
      ARGS="$ARGS $1"
      ;;
  esac
  shift
done

case "$COMMAND" in
  start)                   start       ;;
  stop)                    stop        ;;
  status)                  status      ;;
  condrestart|try-restart) condrestart ;;
  restart)                 restart     ;;
  *)                       usage       ;;
esac

# MIT licensed
# Copyright 2012 Barry Allard