P2P tutorial (ESEC 2001) r Event-based (publish/subscribe)Systems System model -Components (peers)interact by generating and receiving events - Components declare interest in receiving specific (patterns of) events and are notified upon their occurrence Supports a highly flexible interaction between loosely-coupled components XY Subscribe to X followed by Y 2001 Karl Aberer,Manfred Hauswirth ESEC/FSE 2001 13 Event-based vs.Peer-to-Peer ·Common properties: -symmetric communication style dynamic binding between producers and consumers Subscription to events ~"passive"queries -EB:notification P2P:active discovery Subscription language supports more sophisticated queries and pattern matching (event patterns with time dependencies) Event-based systems typically have a specialized event distribution infrastructure EB:2 node types,P2P:1 node type -EB infrastructure must be deployed 2001 Karl Aberer,Manfred Hauswirth ESEC/FSE 2001 14 (c)2001 Karl Aberer,Manfred Hauswirth 7P2P tutorial (ESEC 2001) (c) 2001 Karl Aberer, Manfred Hauswirth 7 © 2001 Karl Aberer, Manfred Hauswirth ESEC/FSE 2001 13 Event-based (publish/subscribe) Systems • System model – Components (peers) interact by generating and receiving events – Components declare interest in receiving specific (patterns of) events and are notified upon their occurrence – Supports a highly flexible interaction between loosely-coupled components Subscribe to X followed by Y X Y XY © 2001 Karl Aberer, Manfred Hauswirth ESEC/FSE 2001 14 Event-based vs. Peer-to-Peer • Common properties: – symmetric communication style – dynamic binding between producers and consumers • Subscription to events ~ “passive” queries – EB: notification – P2P: active discovery • Subscription language supports more sophisticated queries and pattern matching (event patterns with time dependencies) • Event-based systems typically have a specialized event distribution infrastructure – EB: 2 node types, P2P: 1 node type – EB infrastructure must be deployed