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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Answered: Explain why the operation…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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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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