Understanding Networked Applications:
A First Course
Chapter 5
by
David G. Messerschmitt
Understanding Networked Applications A First Course2
Client
host
Server
host
Client
host
Understanding Networked Applications A First Course3
Part of the rationale
• Specialization:
– Clients specialize in user ...
Understanding Networked Applications A First Course4
Client/server
Peer-to-peerServer
“I want to access
some information”
...
Understanding Networked Applications A First Course5
Distinctions
• Client-server
– Asymmetric relationship
– Client predo...
Understanding Networked Applications A First Course6
Client
Server
Client
Email client sends
message to server
Message is ...
Understanding Networked Applications A First Course7
Client
Server
Client
Chat clients send
user’s typing to server
Chat s...
Understanding Networked Applications A First Course8
Presentation
Application
logic
Shared
data
Local-area network
Note: m...
Understanding Networked Applications A First Course9
Client
Web
browser
Web
server
Application
logic
Databases
and DBMS
Co...
Understanding Networked Applications A First Course10
Practice in defining tiers
• Online bookseller (e.g. amazon.com)
• S...
Understanding Networked Applications A First Course11
amazon.com
Understanding Networked Applications A First Course12
Schwab
Understanding Networked Applications A First Course13
Question
• What types of social applications would be
appropriate fo...
Understanding Networked Applications A First Course14
Departments
Enterprise
Commerce
Enterprise-to-enterprise
Consumer
Understanding Networked Applications A First Course15
Customers
Consumer Enterprise
Customer-service
department
Technical-...
Understanding Networked Applications A First Course16
Web server
Customer logic
Customer
audit
Software
documentation
Web
...
Understanding Networked Applications A First Course17
Accounts Products Orders
Customer logic
Databases
Agent logic
Custom...
Understanding Networked Applications A First Course18
Book distribution
centers
books4u.com
Customers
Financial institutio...
Understanding Networked Applications A First Course19
Web server
Customer logic
Customers Merchandise
Web
browser
Orders
A...
Understanding Networked Applications A First Course20
Clients
Customers Merchandise
Acquirer
bank
Book
distributorsOrders
...
Understanding Networked Applications A First Course21
Stock market
stocks4u.com
Customers
Information providers
Consumer E...
Understanding Networked Applications A First Course22
Web server
Customer logic
Accounts Products
Web
browser
Orders
Infor...
Understanding Networked Applications A First Course23
Clients
Accounts Products
Information
providers
Financial
marketsOrd...
Understanding Networked Applications A First Course24
Local florists
flowers4u.com
Customers
Financial institution
Consume...
Understanding Networked Applications A First Course25
Web server
Customer logic
Accounts Products
Web
browser
Orders
Acqui...
Understanding Networked Applications A First Course26
Accounts Products
Acquirer
bank
Orders
Customer logic
Databases
Full...
Understanding Networked Applications A First Course27
Shortcomings of client/server
• Departmental solution
• Proliferates...
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  • Copyright 1999, University of California Jul 29, 2013
  • Copyright 1999, University of California Jul 29, 2013
  • Copyright 1999, University of California Jul 29, 2013
  • Copyright 1999, University of California Jul 29, 2013
  • Copyright 1999, University of California Jul 29, 2013 What is presentation, application logic, shared data? Presentation: Web browser Application logic Shared data
  • Copyright 1999, University of California Jul 29, 2013 What is presentation, application logic, shared data?
  • Copyright 1999, University of California Jul 29, 2013 Deferred applications need a server -- you wouldn’t want communication to fail because a client was turned off, and there is often a “consolidation” function (example chatroom) Immediate applications can be done peer-to-peer -- if a client is turned off, no point to the application anyway. Also avoids server bottlenecks. Server may still have a role is filtering or consolidation.
  • Copyright 1999, University of California Jul 29, 2013 Major goal: flexibility to meet new business opportunities and new organizational structures More tiers to logically decouple roles Away from stovepipe: horizontal as well as vertical structure
  • 05

    1. 1. Understanding Networked Applications: A First Course Chapter 5 by David G. Messerschmitt
    2. 2. Understanding Networked Applications A First Course2 Client host Server host Client host
    3. 3. Understanding Networked Applications A First Course3 Part of the rationale • Specialization: – Clients specialize in user interface – Servers specialize in managing data and application logic • Sharing: – Many clients can be supported by few servers – Often data and logic are shared among applications and users
    4. 4. Understanding Networked Applications A First Course4 Client/server Peer-to-peerServer “I want to access some information” “I want to collaborate with my colleague” Client
    5. 5. Understanding Networked Applications A First Course5 Distinctions • Client-server – Asymmetric relationship – Client predominately makes requests, server makes replies • Peer-to-peer – Symmetric relationship
    6. 6. Understanding Networked Applications A First Course6 Client Server Client Email client sends message to server Message is stored on POP server Later, recipient’s email client retrieves message from server Email application
    7. 7. Understanding Networked Applications A First Course7 Client Server Client Chat clients send user’s typing to server Chat server aggregates typing from all users and sends to all clients Other user’s clients display aggregated typing from chat server Chat application
    8. 8. Understanding Networked Applications A First Course8 Presentation Application logic Shared data Local-area network Note: many clients per application server, several application servers per data server Three-tier client/server
    9. 9. Understanding Networked Applications A First Course9 Client Web browser Web server Application logic Databases and DBMS Common gateway interchange Host architecture Application partition
    10. 10. Understanding Networked Applications A First Course10 Practice in defining tiers • Online bookseller (e.g. amazon.com) • Stock trading system (e.g. Schwab or E- trade)
    11. 11. Understanding Networked Applications A First Course11 amazon.com
    12. 12. Understanding Networked Applications A First Course12 Schwab
    13. 13. Understanding Networked Applications A First Course13 Question • What types of social applications would be appropriate for a client/server architecture?
    14. 14. Understanding Networked Applications A First Course14 Departments Enterprise Commerce Enterprise-to-enterprise Consumer
    15. 15. Understanding Networked Applications A First Course15 Customers Consumer Enterprise Customer-service department Technical-support department software4u.com
    16. 16. Understanding Networked Applications A First Course16 Web server Customer logic Customer audit Software documentation Web browser Problem knowledge base Databases Agent logic Consumer application Enterprise application Technician logic Web server Web browser Web server Web browser Customercare
    17. 17. Understanding Networked Applications A First Course17 Accounts Products Orders Customer logic Databases Agent logic Customers Agents Technicians Technician logic
    18. 18. Understanding Networked Applications A First Course18 Book distribution centers books4u.com Customers Financial institution Consumer Enterprise Inter-enterprise
    19. 19. Understanding Networked Applications A First Course19 Web server Customer logic Customers Merchandise Web browser Orders Acquirer bank Book distributors Databases Outside links Fullfillment logic Consumer e-commerce Inter-enterprise e-commerceBookmerchant
    20. 20. Understanding Networked Applications A First Course20 Clients Customers Merchandise Acquirer bank Book distributorsOrders Customer logic Databases Fullfillment logic
    21. 21. Understanding Networked Applications A First Course21 Stock market stocks4u.com Customers Information providers Consumer Enterprise Inter-enterprise
    22. 22. Understanding Networked Applications A First Course22 Web server Customer logic Accounts Products Web browser Orders Information providers Financial markets Databases Outside links Trading logic Consumer e-commerce Inter-enterprise e-commerceStocktrader
    23. 23. Understanding Networked Applications A First Course23 Clients Accounts Products Information providers Financial marketsOrders Customer logic Databases Trading logic
    24. 24. Understanding Networked Applications A First Course24 Local florists flowers4u.com Customers Financial institution Consumer Enterprise Inter-enterprise
    25. 25. Understanding Networked Applications A First Course25 Web server Customer logic Accounts Products Web browser Orders Acquirer bank Databases Outside link Fullfillment logic Consumer e-commerce Inter-enterprise e-commerce Push client Push server Floristdelivery
    26. 26. Understanding Networked Applications A First Course26 Accounts Products Acquirer bank Orders Customer logic Databases Fullfillment logic Customers Florists
    27. 27. Understanding Networked Applications A First Course27 Shortcomings of client/server • Departmental solution • Proliferates non-interoperable technologies and applications • Hardwired applications lose flexibility What are some goals and likely characteristics of future enterprise architectures?
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