[erlang-questions] Asynchronous calls in gen_server

[Andrew Berman]

Hello,

I have a question about the inner workings of an async call in gen_servers.
 Is there any sort of queue built for async messages?  For example, if the
server receives a large amount of messages to an async method:

   1. How does it determine in which order to process those calls?
   2. Does it store the messages somewhere to be processed by the function
   at a later time?
   3. Does it just reject those calls it doesn't have the bandwidth to
   process?
   4. How are async calls different than say using something like RabbitMQ
   where I could post to a RabbitMQ queue and have some external application
   process what is in that queue?
   5. Assuming it does use some sort of queue, is there a way to store
   messages across restarts or crashes?

Thanks for any help you can give me,

Andrew
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