电子IPC消息过多

我正在尝试在Electron (atom shell)平台上构建一个桌面应用程序，目前在mac os x上。

我正在尝试它的IPC(进程间通信)模块，用于在两个主要电子进程，主进程和渲染进程之间发送和接收同步和异步消息。

然而，对于异步消息，我得到的消息比预期的要多，因为我已经从渲染进程发送到主进程，在主进程中它们被回复。我知道这是从控制台输出的，主进程的应答应该产生的。

对于DOM的2个组件中的每一个，我向主进程发送1条消息，它用一个记录到控制台的回复来响应。但是对于2个组件(react组件)，我得到4个控制台日志行，对于3个组件，它是9，对于4个组件，它是16个控制台日志消息行。

这是怎么回事?我错过了什么关于异步消息和IPC回复?同步消息和回复没有问题。

var app = require('app');  // Module to control application life.
var BrowserWindow = require('browser-window');  // Module to create native browser window.
var ipc = require('ipc');
// Report crashes to our server.
require('crash-reporter').start();
// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is GCed.
var mainAppWindow = null;
var bookWindow = null;
// Quit when all windows are closed.
app.on('window-all-closed', function() {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  app.quit();
});
// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
app.on('ready', function() {
  // Create the browser window.
  mainAppWindow = new BrowserWindow({width: 1200, height: 900, 'title-bar-style': 'hidden'});
  // and load the index.html of the app.
  mainAppWindow.loadUrl('file://' + __dirname + '/index.html');
  mainAppWindow.openDevTools();
  // Emitted when the window is closed.
  mainAppWindow.on('closed', function() {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainAppWindow = null;
    app.quit();
  });
  ipc.on('asynchronous-message', function(event, arg) {
    console.log(arg);  // prints "ping"
    event.sender.send('asynchronous-reply', 'pong');
  });

  // listen for the messages from renderer process to close the mainwindow and open a readerwindow
  ipc.on('synchronous-message', function(event, arg) {
    console.log(arg);  // prints "ping"
    event.returnValue = 'pong';
  });
  // when all of the book reader windows are closed open the mainAppWindow
  // in main process listen for all bookreaderwindows are closed
  // and in each, checking an array of them formed when they are each created.
});

index.js(渲染程序代码):

/*
-mainApp
  -Controls
  -Books
    -Book
*/
var ipc = require('ipc');
var Book = React.createClass({
  switchToBookReader: function() {
    // close mainAppWindow, and open bookreader window.
    // send message to main process 'close window'.
    // listen in main process for this.
    // callback for this in main process is to close the main window and open a readerwindow
  },
  componentDidMount: function() {
    ipc.send('asynchronous-message', 'ping');
    ipc.on('asynchronous-reply', function(arg) {
      console.log(arg); // prints "pong"
    });
    console.log(ipc.sendSync('synchronous-message', 'ping')); // prints "pong"
  },
  render: function() {
    return (
      <div onDoubleClick={this.switchToBookReader()} >
        {this.props.name}
      </div>
    );
  }
});
var Books = React.createClass({
  render: function() {
    // create Book nodes here.
    var bookNodes = [];
    bookNodes.push(<Book name="book1"/>);
    bookNodes.push(<Book name="book2"/>);

    return (
      <div>
        {bookNodes}
      </div>
    );
  }
});
var Controls = React.createClass({
  render: function() {
    return (
      <div>
        Controls
      </div>
    );
  }
});
var mainApp = React.createClass({
  render: function() {
    return (
      <div>
        <Controls />
        <Books />
      </div>
    );
  }
});
React.render(<mainApp />, document.body);