"j0285750" - 1 õppematerjal

Programmeerimiskeel

style) .Developed to decouple user interface from data storage .Leads to improved maintainability (changes to UI and database can be made independently .Characteristics of a server: .Passive (slave) .Waits for requests .Upon receipt of requests, processes them and then serves replies .Characteristics of a client: .Active (master) .Sends requests .Waits for and receives server replies ITK 2007, Kalev Pihl Sissejuhatus informaatikasse 21 C:Program FilesMicrosoft OfficeMEDIACAGCAT10j0285750.wmf C:Program FilesMicrosoft OfficeMEDIACAGCAT10j0285750.wmf C:Program FilesMicrosoft OfficeMEDIACAGCAT10j0285750.wmf Three-tier model (Repository style) ITK 2007, Kalev Pihl Sissejuhatus informaatikasse 22 http://upload.wikimedia.org/wikipedia/en/6/66/Overview_of_a_three-tier_application.png Peer-to-peer •Generalization of client/ server style •Each subsystem can be a client and a server •Two examples from history Usenet and FidoNet •Recent application Napster