jar 启动jio本

jar_start_wrapper.sh

#!/bin/bash

# arg $1: 退出值
# arg $2: 错误信息
function exit_msg() {
  [[ $2 != "" ]] && echo "$2" 1>&2
  exit "$1"
}

# arg $1: 进程 pid
function isRunning() {
  ps -p "$1" &>/dev/null
}

# arg $1: 程序文件
# arg $2: 进程名
# arg $3: pid 文件
# arg $4: 日志文件
function runDaemon() {
  EXEC="$(basename "$JAR_FILE")"
  start-stop-daemon --start --quiet \
    --exec "$EXEC" \
    --make-pidfile --pidfile "$PID_FILE" \
    --background --no-close \
    --startas "$(which java)" \
    --chdir "$(dirname "$JAR_FILE")" \
    -- -jar -Xmx200M "$EXEC" "${@}" \
    >>"$LOG_FILE" 2>&1 || exit_msg 10
}

function stopPidFile() {
  [[ -f "$PID_FILE" ]] || return 0
  pid=$(cat "$PID_FILE")
  isRunning "$pid" || {
    echo "未运行 (process ${pid}). 删除 pid 文件" 1>&2
    rm -f "$PID_FILE"
    return 0
  }
  kill "$pid" &>/dev/null || {
    echo "无法停止进程 $pid" 1>&2
    return 1
  }
  for ((i = 1; i <= 5; i++)); do
    isRunning "$pid" || {
      echo "已结束 [$pid]"
      rm -f "$PID_FILE"
      return 0
    }
    [[ $i -eq 3 ]] && kill "$pid" &>/dev/null
    sleep 1
  done
  echo "无法停止进程 $pid" 1>&2
  return 1
}

function runJar() {
  echo "后台运行：$JAR_FILE"
  if [[ -f "$PID_FILE" ]]; then
    pid=$(cat "$PID_FILE")
    if [[ $(isRunning "$pid") && 'true' != "$RESTART" ]]; then
      echo "Already running [$pid]" 1>&2
      return 1
    fi
    stopPidFile "$PID_FILE" || return 1
  fi
  runDaemon "$@"
  return $?
}

JAR_FILE="$1"
PID_FILE="${JAR_FILE}.pid"
LOG_FILE="${JAR_FILE}.log"
CMD="$2"
RESTART="$3"

[ -f "$JAR_FILE" ] || exit_msg 1 "找不到 jar 文件"

case "$CMD" in
'start')
  runJar "${@:5}"
  exit $?
  ;;
'stop')
  stopPidFile
  exit $?
  ;;
*)
  exit_msg 2 "未知命令, Usage: $0 /path/to/jar [start|stop] [true|false]"
  ;;
esac

# 用法：./jar_start_wrapper.sh [jar 路径] [启动或停止,start|stop] [是否重启,true|false]