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Synchronization among Heterogeneous Distributed Objects

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16 January 2014


What is a Distributed System?

A distributed system is a collection of autonomous hosts that that are connected through a computer network. Each host executes components and operates a distribution middleware, which enables the components to coordinate their activities in such a way that users perceive the system as a single, integrated computing facility.

Principles of Object-Oriented Middleware

Network Operating System

Facilitate physical interchange of electrical or optical signals as packets of

information

Detect and correct transmission errors

Implement routing of packets between hosts

Compose packets into messages

Application

Requesting operations from remote objects

Middleware

Shield lower level details from applications

Synchronization

What should client do while server executes

Wait?

Not care?

Proceed concurrently and re-synchronise later?

What should server do if clients request operations concurrently

Process them sequentially?

Process them concurrently?

Each of these reasonable

Most supported by middleware primitives

Dynamic Association Information

inter-app association 협업세션내의 어플리케이션간 연관된 정보 inter-content association 어플리케이션에서 사용하고 있는 콘텐츠에 대한 연관정보

Collaboration Agent 협업 세션내 앱들의 분산 컨텍스트 정보 분석 컴포넌트

References

[1] Wolfgang Emmerich and Nima Kaveh, Validating Distributed Object & Component Designs, 2003.


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