imptest/src/lib/Watchdog.js

Electric Imp Test Runner

// MIT License
//
// Copyright 2016 Electric Imp
//
// SPDX-License-Identifier: MIT
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
// EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

/**
 * Watchdog timer
 */

'use strict';

const DebugMixin = require('./DebugMixin');
const EventEmitter = require('events');

class Watchdog extends EventEmitter {

  constructor() {
    super();
    DebugMixin.call(this);
    this.name = null;
    this.timeout = 0;
    this._timerId = null;
  }

  start() {
    this._timerId = setTimeout(
      this._onTimeout.bind(this),
      this._timeout * 1000
    );

    this._debug(`Watchdog "${this.name}" started`);
  }

  reset() {
    this.stop();
    this.start();
  }

  stop() {
    if (this._timerId) {
      clearTimeout(this._timerId);
      this._timerId = null;
    }

    this._debug(`Watchdog "${this.name}" stopped`);
  }

  _onTimeout() {
    this._debug(`Watchdog "${this.name}" timed out`);
    this.emit('timeout', {name: this.name});
  }

  get timeout() {
    return this._timeout;
  }

  set timeout(value) {
    this._timeout = value;
  }

  get name() {
    return this._name;
  }

  set name(value) {
    this._name = value;
  }
}

module.exports = Watchdog;