Rails异步通信和xhr轮询
我需要编写一个 Rails 应用程序 (JRuby)，它在后台与另一个服务进行异步通信。每个浏览器会话需要一个连接。 （它实际上不需要是一个打开的TCP连接，但我需要在会话结束后释放资源。）与后台服务的通信不是严格的请求-响应。任何时候都可以从服务向 Rails 应用程序发送消息。
我还需要实施该协议。我该怎么做？是否有适用于 Ruby on Rails 的异步框架（例如 Twisted 或 Node.js）？我只需要一些起点。
我已经用 Python 编写了客户端协议的快速实现。事实上，完整的协议是我编写的（服务器是用JavaScript编写的），所以我可以完全改变协议。然而，由于问题的性质，异步性质无法改变。
我还需要 XHR 轮询/WebSockets 才能将异步更改推送到浏览器。有没有相关的 gem/howto/tutorial？我不能只是将请求设置为睡眠（资源！）。
如果您想了解更多背景信息： Rails 应用程序是一种辅助工具。它与之通信的服务实际上是一个加载和呈现网页的 Firefox 插件。异步特性来自 (i) 框架、弹出窗口（window.open()、window.alert()...）、DOM 树的动态更改我需要使用 JRuby，因为我需要使用 Jena (Java) 框架进行 RDF 处理。
I need to write a Rails application (JRuby) that does asynchronous communication with another service in the background. There needs to be one connection per browser session. (It does not really need to be a open TCP connection but I need to free resources after the session ends.) The communication with the background service is not strict request - response. At any time there can be a message sent from the service to the rails app.
I also need to implement the protocol. How do I do this? Is there a asynchronous framework (e.g. like Twisted or Node.js) for Ruby on Rails? I just need some starting points.
I already wrote a quick implementation of the client side protocol in Python. In fact the complete protocol is made up by me (the server is written in JavaScript), so I could change the protocol completely. However, the asynchronous nature cannot be changed because of the nature of the problem.
Also I need XHR polling/WebSockets in order to push the async changes to the browser. Is there a gem/howto/tutorial for that? I can't just set the request to sleep (resources!).
In case you want to know more about the background:
The Rails application is a accessibility tool. The service with which it communicates is actually a Firefox Add-on that loads and renders webpages. The asynchronous nature comes from (i)frames, popup windows (window.open(), window.alert(), ...), dynamic changes to the DOM tree that have to be communicated to the Rails app, redirects (like after posing in a forum) etc. I need to use JRuby because I need to use the Jena (Java) framework for RDF processing.
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Ruby On Rails 也是一个异步框架。使用瘦服务器。 Node.js 或 Twisted 不是异步框架。只有事件框架。
在 ruby 中，事件框架是 EventMachine，瘦服务器使用它。您可以使用rack::middleware 创建一些websocket 并使用它。
Ruby On Rails is an asynchronous framework too. with a thin server. Node.js or Twisted are not a Asynchrone framework. There just Event framework.
In ruby the Event Framework is EventMachine and thin serveur use it. You can create some websocket with a rack::middleware and use it.
看看Juggernaut 2，它正是这样做的（并且它也使用节点）。我用它来将消息从我的服务器推送到所有连接的客户端，效果很好。实施很容易（尽管自述文件对某些事情有点不清楚），让我知道您是否需要任何帮助。
Have a look at Juggernaut 2, it does exactly this (and it also uses node). I am using it to push messages from my server to all connected clients and it works great. Implementation was a breeze (although the readme is a bit unclear on certain things), lemme know if you need any help with it.