COMP 504 Fall 2015	Communications Assignment 4: Commands in the Real World

Question:  

Give at least 3 compelling examples of the Command Design Pattern from the real world

• The example needs to clearly demonstrate that the use of the command is something necessary and important, not just an artificial insertion of a command process just for the sake of executing a command.
• Remember that one of the key features of a command pattern is that the receiver, the one that actually executes the command, does NOT know what the command actually is, at least not until they execute the command.
  • One way (but not necessarily the only way!) to think about this to consider the notion of the receiver not being in a postion to question the use of the command but rather, just simply to execute it when appropriate.
• Give BOTH pros and cons for each example.
  • In particular, be sure to consider the following issues but do not limit yourselves to
    • Size/complexity of the overall system -- the overall number of components in the system and the complexity of how they interact
    • Flexibility -- the need to be configurable for many different tasks at the moment
    • Extensibility -- the need to be able to do new and different tasks in the future
    • Robustness -- the abillity to withstand erroneous input and/or usage
    • Correctness/security   -- the ability to produce the correct results and in a secure manner
    • Any other issues that you think are relevant.

Be sure to follow the General Communications Guidelines when writing your discussions!

© 2015 by Stephen Wong