Active ObjectThis is a simple example of the Active Object concurrency pattern. Example code is provided in both Ruby and Java.

See http://en.wikipedia.org/wiki/Active_Object

This is intended to be used in my talk on Active Object at the Melbourne Patterns group http://melbournepatterns.org/

The example is a contrived one of a domain name reseller selling .com, .com.au, and .co.nz domain names with the restriction that the respective domain name registries (or registrars) only allowing one connection at a time from the reseller.

Note that I assume a really simple FIFO scheduler and so do not supply a queue iterator on the Activation Queue, instead I just supply a dequeue method to take the first item off the queue, blocking if the queue is empty.

Directory structure:

- examples: contains example usage in ruby of the classes defined in the other directories.
- classic: contains ruby classes needed for a classic implementation of Active Object where each "active object" consists
of a proxy (ActiveDomainNameRegistry) that has a reference to a single servant (DomainNameRegistry),
and a single scheduler (Scheduler), and the scheduler contains a single activation queue (ActivationQueue).
- variation: contains a variation (in ruby) of the pattern that allows multiple servants per activation queue
and is avoids being tied to a single type of servant by using method_missing.
- java: contains the sample example code in java