#!/bin/sh

WEB_APP_NAME=test
JAR_NAME=${WEB_APP_NAME}\.jar
PID=${WEB_APP_NAME}\.pid

#使用說明，用來提示輸入參數
usage() {
    echo "Usage: sh 執行腳本.sh [start|stop|restart|status]"
    exit 1
}

#檢查程序是否在運行
is_exist(){
  pid=`ps -ef|grep ${JAR_NAME}|grep -v grep|awk '{print $2}'`
  #如果不存在返回1，存在返回0
  if [[ -z "${pid}" ]]; then
   return 1
  else
    return 0
  fi
}

#啟動方法
start(){
  is_exist
  if [[ $? -eq "0" ]]; then
    echo ">>> ${JAR_NAME} is already running PID=${pid} <<<"
  else
    nohup java -jar ${JAR_NAME} >/dev/null 2>&1 &
    echo $! > ${PID}
    echo ">>> start ${JAR_NAME} successed PID=$! <<<"
   fi
  }

#停止方法
stop(){
  pid_file=$(cat ${PID})

  if [[ -z ${pid_file} ]];then
    echo ">>> ${JAR_NAME} pid file is not exist <<<"
  else
      echo ">>> ${JAR_NAME} PID = ${pid_file} begin kill ${pid_file} <<<"
      kill ${pid_file}
      rm -rf ${PID}
      sleep 2
  fi
  is_exist
  if [[ $? -eq "0" ]]; then
    echo ">>> ${JAR_NAME} exist PID = ${pid} begin kill -9 ${pid} <<<"
    kill -9 ${pid}
    sleep 2
    echo ">>> ${JAR_NAME} process stopped <<<"
  else
    echo ">>> ${JAR_NAME} is not running <<<"
  fi
}

#輸出運行狀態
status(){
  is_exist
  if [[ $? -eq "0" ]]; then
    echo ">>> ${JAR_NAME} is running PID is ${pid} <<<"
  else
    echo ">>> ${JAR_NAME} is not running <<<"
  fi
}

#重啟
restart(){
  stop
  start
}

#根據輸入參數，選擇執行對應方法，不輸入則執行使用說明
case "$1" in
  "start")
    start
    ;;
  "stop")
    stop
    ;;
  "status")
    status
    ;;
  "restart")
    restart
    ;;
  *)
    usage
    ;;
esac
exit 0