Lec02 - Today Architectures for distributed systems(Chapter...

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Computer Science Lecture 2, page CS677: Distributed OS Today Architectures for distributed systems (Chapter 2) Centralized, decentralized, hybrid Middleware Self-managing systems 1 Computer Science Lecture 2, page CS677: Distributed OS Architectural Styles Important styles of architecture for distributed systems Layered architectures Object-based architectures Data-centered architectures Event-based architectures 2
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Computer Science Lecture 2, page CS677: Distributed OS Layered Design Each layer uses previous layer to implement new functionality that is exported to the layer above Example: Multi-tier web apps 3 Computer Science Lecture 2, page CS677: Distributed OS Object-based Style Each object corresponds to a components Components interact via remote procedure calls Popular in client-server systems 4
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Computer Science Lecture 2, page CS677: Distributed OS Event-based architecture Communicate via a common repository Use a publish-subscribe paradigm Consumers subscribe to types of events Events are delivered once published by any publisher 5 Computer Science Lecture 2, page CS677: Distributed OS Shared data-space “Bulletin-board” architecture Decoupled in space and time Post items to shared space; consumers pick up at a later time 6
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