Application Layer Programming - Slides (R1)

Application Layer Programming - Slides (R1) - CSCI 232 CSCI...

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SCI 232 CSCI 232 Computer Networking: Application Layer Programming George Blankenship Programming George Blankenship 1
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Lecture Outline • Programming concepts – PDUs and SDUs ransport Interface Transport Interface – System-to-system messages – General program flow • WinSock (C++) • Java.net API Programming George Blankenship 2
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Programming Concepts • Horizontal dialog – Defined in the application design – Oriented towards transactions – Transaction defined by sequence of messages • Vertical control – Defined by the service provider (transport) –S imple command set – Connect to transport – Send/receive data Programming George Blankenship 3
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Horizontal Dialog • Service based relationship between two peer entities •A t a given instant one entity is requesting a service and the other is supplying a service he request is a series of messages that that The request is a series of messages that that must be processed as a unit he protocol is oriented towards defining • The protocol is oriented towards defining processing units Programming George Blankenship 4
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Vertical Controls • Traffic moves vertically between a mmunication service user and a communication communication service user and a communication service provider he service user is the application • The service user is the application • The service provider is the transport layer • Provided service – Open transport – Send data – Receive data lose transport Programming George Blankenship 5 – Close transport
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Application Functions • Define the location of the peer • Define the bounds of a transaction reate the APDUs (Application Protocol Create the APDUs (Application Protocol Data Units) that define the transaction data ovement movement • Process the APDs that define the transaction ata movement data movement • Use the service provider Programming George Blankenship 6
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Server Functions • Wait for the request • Perform the service CID based performance ACID based performance – Atomic operation onsistency – Consistency – Isolation – Durability • QoS provider Programming George Blankenship 7
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Client Functions • Initiate connection • Request the service nd- stem/end- ser oriented End system/end user oriented – Gather request components ransform to form expected by server – Transform to form expected by server – Hide server functions/operation • Co-operate with server to fulfill QoS requirements Programming George Blankenship 8
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This note was uploaded on 09/03/2010 for the course CS 232 taught by Professor Susan during the Summer '09 term at GWU.

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Application Layer Programming - Slides (R1) - CSCI 232 CSCI...

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