P2P tutorial (ESEC 2001) 和 Usage Patterns to position P2P Discovering information is the predominant problem Occasional discovery:search engines P2P,MA ad hoc requests,irregular -E.g.,new town-where is the next car rental? Notification:event-based systems push notification for(correlated)events(event patterns) -E.g.,notify me when my stocks drop below a threshold .Regular discovery:P2P systems search engines,MA find certain type of information on a regular basis E.g.,search for MP3 files of Jethro Tull regularly ● Continuous information feed:push systems event-based -subscription to a certain information type -E.g.,sports channel,updates are sent as soon as available 82001 Karl Aberer,Manfred Hauswirth ESEC/FSE 2001 The Interaction Spectrum Event-based systems Mobile agents Push systems Peer-to-peer systems passive active 2001 Karl Aberer,Manfred Hauswirth ESEC/FSE 2001 22 (c)2001 Karl Aberer,Manfred Hauswirth 11P2P tutorial (ESEC 2001) (c) 2001 Karl Aberer, Manfred Hauswirth 11 © 2001 Karl Aberer, Manfred Hauswirth ESEC/FSE 2001 21 Usage Patterns to position P2P Discovering information is the predominant problem • Occasional discovery: search engines – ad hoc requests, irregular – E.g., new town — where is the next car rental? • Notification: event-based systems – notification for (correlated) events (event patterns) – E.g., notify me when my stocks drop below a threshold • Regular discovery: P2P systems – find certain type of information on a regular basis – E.g., search for MP3 files of Jethro Tull regularly • Continuous information feed: push systems – subscription to a certain information type – E.g., sports channel, updates are sent as soon as available P2P, MA push search engines, MA event-based © 2001 Karl Aberer, Manfred Hauswirth ESEC/FSE 2001 22 The Interaction Spectrum Event-based systems Push systems Mobile agents Peer-to-peer systems passive active