Anyone know of a gem/plugin that lets you send alerts to currently logged in users of a Rails app via AJAX?
For example, I want to send an alert like "The system will be going down in 5 minutes for a quick upgrade. Please save your work now and log off."
I'm working on an AJAX-heavy Rails app in which the user doesn't reload the entire page much, so just the standard rails flash messages and warnings wouldn't be too useful. Perhaps the client side would use AJAX to poll the server for these global system alerts.
It's no big task to write my own code for this, but this seems like such a commonly needed feature that I'm wondering if there is already a gem/plugin for it? Or is there another way that is commonly used to send a global system message to users?