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Event-driven communication paradigm - page 11 / 25

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Event-driven Systems

Pub/sub not sufficient for general applications

decouples publishers and subscribers  

pubs and/or subs need not be running at the same time  

publishers are anonymous to subscribers

subs need to know topic (attributes), not pubs’ names and locations

but receivers may need to know the sender or sender’s role

only multicast, one-to-many communication

may also need one-to-one and request-reply

can’t reply

either anonymously, e.g. to vote, or identified (can be fixed)

efficient notification for large-scale systems using CBR

but content-based routing may violate privacy of information

subscriptions may also be confidential

Event-driven Systems

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