Distributed Coordination-Based Systems - Maarten van Steen

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Coordination-Based Systems 13.2 Architectures 8 / 14 Example: TIB/Rendezvous Coordination model Uses of subject-based addressing ⇒ publish-subscribe system. Receiving a message on subject X is possible only if the receiver had subscribed to X Publishing a message on subject X ⇒ message is sent to all (currently running) subscribers to X. Publ. on A Subs. to A Subs. to A Publ. on B Subs. to A Subs. to B Subs. to B Subj: A Subj: B RV lib RV lib RV lib RV lib RV lib RV daemon RV daemon RV daemon RV daemon RV daemon Multicast message on A to subscribers Multicast message on B to subscribers Network
Coordination-Based Systems 13.2 Architectures 9 / 14 Example: Lime Lime Every node has its own dataspace: When P and Q are in each other’s proximity, dataspaces become shared Published data items are stored locally, until removed P can publish data items from specific process Reactions describe what to do when a match is found Transient, shared dataspace Process Process Process Local dataspace Local dataspace Local dataspace Wireless link
Page 1 and 2: Distributed Systems Principles and
Page 3 and 4: Coordination-Based Systems 13.1 Coo
Page 5 and 6: Coordination-Based Systems 13.2 Arc
Page 7: 7 / 14 Coordination-Based Systems E
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Page 13 and 14: Coordination-Based Systems 13.7 Con

Distributed Coordination-Based Systems - Maarten van Steen

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