1. Explain why the operation handleMessagefromServer() appears in both ObservableClient and AdaptableClient classes. Are they concrete or abstract?2. If we want the system give a signal to the client when a message from the server is received, what should the program do? Indicate what methods will be used to implement your idea.3. Indicate the advantages of using the Observable pattern and Adapterpattern in this design. The following is a class diagram of a subsystem of a Chat program using OCSF.«interface»>Observer«interface»>CharlFdisplay()IClientConsoleaccept()display()main()clientUIupdate()AIIChatClientupdate()clientquite()handleMessageFromClientUI()ObservablenotifyObservers()AbstractClientAdaptableClientconnection Extablished()connectionClosed()handleMessagefromServer()ObservableClientopenConnection()closeConnection()sendToServer()isConnected()connection Closed()connection Established()handleMessagefromServer()1

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Explain why the operation handleMessagefromServer() appears in both ObservableClient and AdaptableClient classes. Are they concrete or abstract?

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter18: Stacks And Queues

Section: Chapter Questions

Problem 18PE

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Question

100%

1. Explain why the operation handleMessagefromServer() appears in both ObservableClient and AdaptableClient classes. Are they concrete or abstract?

2. If we want the system give a signal to the client when a message from the server is received, what should the program do? Indicate what methods will be used to implement your idea.

3. Indicate the advantages of using the Observable pattern and Adapter
pattern in this design.

The following is a class diagram of a subsystem of a Chat program using OCSF.
«interface»>
Observer
«interface»>
CharlF
display()
I
ClientConsole
accept()
display()
main()
clientUI
update()
A
I
I
ChatClient
update()
client
quite()
handleMessageFromClientUI()
Observable
notifyObservers()
AbstractClient
AdaptableClient
connection Extablished()
connectionClosed()
handleMessagefromServer()
ObservableClient
openConnection()
closeConnection()
sendToServer()
isConnected()
connection Closed()
connection Established()
handleMessagefromServer()
1

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