Class MQ::RPC
In: lib/mq/rpc.rb
Parent: BlankSlate

Basic RPC (remote procedure call) facility.

Needs more detail and explanation.

 EM.run do
   server = MQ.rpc('hash table node', Hash)

   client = MQ.rpc('hash table node')
   client[:now] = Time.now
   client[:one] = 1

   client.values do |res|
     p 'client', :values => res
   end

   client.keys do |res|
     p 'client', :keys => res
     EM.stop_event_loop
   end
 end

Methods

Public Class methods

Takes a channel, queue and optional object.

The optional object may be a class name, module name or object instance. When given a class or module name, the object is instantiated during this setup. The passed queue is automatically subscribed to so it passes all messages (and their arguments) to the object.

Marshalling and unmarshalling the objects is handled internally. This marshalling is subject to the same restrictions as defined in the Marshal standard library. See that documentation for further reference.

When the optional object is not passed, the returned rpc reference is used to send messages and arguments to the queue. See method_missing which does all of the heavy lifting with the proxy. Some client elsewhere must call this method with the optional block so that there is a valid destination. Failure to do so will just enqueue marshalled messages that are never consumed.

Public Instance methods

Calling MQ.rpc(*args) returns a proxy object without any methods beyond those in Object. All calls to the proxy are handled by method_missing which works to marshal and unmarshal all method calls and their arguments.

 EM.run do
   server = MQ.rpc('hash table node', Hash)
   client = MQ.rpc('hash table node')

   # calls #method_missing on #[] which marshals the method name and
   # arguments to publish them to the remote
   client[:now] = Time.now
   ....
 end

[Validate]