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Review Ques 4

1. What one thing we should be expect in:

• a poorly architectured system?
• a well architectured system?

2. Package switching network (PSN):

• Define the components of a PSN
• What other architecture was package switching designed to replace?
• Why was an advantage of that other architecture?
• What feature of PSN make it attractive as an alternate architeture?

3. Blackboard architecutures:
   • Define the components of a blackboard architecture;
   • For which projects are blackboard architectures are ideal?
4. Pipe and Fiter:
   • Describe the components of a pipe and filter architecture.
   • Give an example of a commonly used system that makes extensive use of pipe and filter
   • Explain one advantage of pipe and filter
   • Explain one dsadvantage of pipe and filter
5. CRUD:
   • What is the CRUD pattern?
   • Give two example where CRUD pattern is used.
6. In Windows machine if you open one folder in two different views, rename folder in one view automatically renames the other.
   • What type of architecture is this?
   • Describe different components of this architecture with respect to the above example.
7. Layered architectures:
   • What is "LAMP" and why is it an example of a layered architecture>
   • Explain one advantage of a layered architecture.
   • Explain one dsadvantage of pipe and filter
   • What is "MEAN" and why is it sometimes called a "leaky layered" architecture?
   • Why is MEAN replacing LAMP in certain fast-paced organizations?
8. Architectures and Programming

Consider the following functionality in Javascript, which gets the mouse cursor position upon the cursor move:

       $(document).bind('mousemove', function(event) {
       position = {'x' : event.pageX, 'y': event.pageY};
       });

Now, here is the similar functionality in ELM:

       import Mouse
       main = lift asText Mouse.position

• How are the different functions retrieving the mouse positions?
• What architecture the lift construct in the ELM program is utilizing for this functionality? Explain.