This is an EventMachine module that performs the job of an async job queue.
The server takes a string of ruby and returns a ticket ID, and disconnects. Clients can then
 reconnect to determine the state of their job.

You can use this server as a replacement for BackgrounDrB to spin off long jobs in Rails without tying up your web processes.

Typical usage looks like the following:
EventMachine::run do
  TransactionMachine::server( :host => 'localhost', :port => 12345 )
end


Transaction machine protocol looks like this:
C: CHECK ticketid\n\n
S: DONE chars-count\n\nMARSHALED-DATA  or
S: WORKING\n\n
S: NOTFOUND\n\n

C: QUEUE chars-count\n\nMARSHALED-DATA
S: ticketid\n\n
S: ERROR reason\n\n

When queueing, you queue a marshalled hash that looks like this:

{
  :defer => {
    :method => "String of ruby code to eval.",
    :callback => "String of ruby code to clean up the callback. Needs to set JobQueue.jobs[@key] = the result you want to return."
  },
  :inline => {
    "Async-friendly ruby code to be evalulated in the handler. The result is automatically set to the result."
  }
}

If you use both :defer and :inline, it is undefined which one wins.