Key OOP Concepts Used with the Symmetric Proxy | 475The only real difference between Figure 13-4 and Figure 13-3 is that the proxy and
players are placed into single objects and the details of the Internet are spelled out a
bit more in the latter. The same model could be used another way to send the
proxy’s move such as PHP, ColdFusion, or any other mechanism for sending infor-
mation over the Internet. (Axel Schreiner commented that you could use smoke sig-
nals—the method of sending information over the network is immaterial.)
The one thing we don’t particularly like about the androgynous variation on the
Symmetric Proxy is the loss of granularity in the model. By placing the proxy move
method in the same object as the real player, we collapse the real and proxy in a way
that may not be easily adaptable to other games. At this point, though, no clear dis-
advantage is apparent. Both players are perfectly symmetrical, and the variation
maintains the role of the referee.
Key OOP Concepts Used with the Symmetric Proxy
For a compound design, all the OOP concepts we have discussed for the different
design patterns collected in a single compound design apply. So, to avoid repeating
the same key concepts discussed in the chapters where the compounding elements
Figure 13-4. Androgynous variation of Symmetric Proxy
Player1 Proxy2Referee 1InternetShared objectInternetProxy1 Player2Referee 2