By Boon Thau Loo, Wenchao Zhou
Declarative Networking is a programming technique that allows builders to concisely specify community protocols and companies, that are at once compiled to a dataflow framework that executes the requisites. Declarative networking proposes using a declarative question language for specifying and enforcing community protocols, and employs a dataflow framework at runtime for conversation and upkeep of community nation. the first target of declarative networking is to significantly simplify the method of specifying, enforcing, deploying and evolving a community layout. furthermore, declarative networking serves as a tremendous step in the direction of an extensible, evolvable community structure which could help versatile, safe and effective deployment of latest community protocols.
This ebook offers an creation to easy concerns in declarative networking, together with language layout, optimization and dataflow execution. The technique in the back of declarative programming of networks is gifted, together with roots in Datalog, extensions for networked environments, and the semantics of long-running queries over community kingdom. The booklet specializes in a consultant declarative networking language referred to as community Datalog (NDlog), that's in response to extensions to the Datalog recursive question language. an summary of declarative community protocols written in NDlog is equipped, and its utilization is illustrated utilizing examples from routing protocols and overlay networks.
This e-book additionally describes the implementation of a declarative networking engine and NDlog execution innovations that supply eventual consistency semantics with major flexibility in execution. consultant declarative networking platforms (P2 and its successor RapidNet) are provided. ultimately, the publication highlights contemporary advances in declarative networking, and new declarative techniques to comparable difficulties.
desk of Contents: advent / Declarative Networking Language / Declarative Networking assessment / disbursed Recursive question Processing / Declarative Routing / Declarative Overlays / Optimization of NDlog / fresh Advances in Declarative Networking / Conclusion
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Additional resources for Declarative Networking
6 The periodic(@N,E,T,K) event relation is a built-in relation that represents a stream of event tuples generated at node N every T seconds (up to an optional K times) with a random event identifier E. If K is omitted, the stream is generated infinitely. , 2003] or the table functions of SQL, but their storage semantics are those of events, as described above. For example, the periodic(@S,E,5) in rule pp1 denotes an infinite stream of periodic event tuples generated at node S every 5 seconds with random identifier E.
3: Localized rules for distributed rule sp2. The rewrite is achievable because the link and path predicates, although at different locations, share a common join address field. 2 DISTRIBUTED DATAFLOW GENERATION sp2a linkDnew (S,@Z,C) :- linkold (@S,Z,C). sp2b-1 pathnew (@S,D,Z,P,C) :- link(@Z,S,C3), linkD(S,@Z,C1), . pathold (@Z,D,Z2,P2,C2), C = C1 + C2, . sp2b-2 . P = f _concatP ath(S,P2). pathnew (@S,D,Z,P,C) :- link(@Z,S,C3), . linkDold (S,@Z,C1), path(@Z,D,Z2,P2,C2), C = C1 + C2, P = f _concatP ath(S,P2).
2003] or the table functions of SQL, but their storage semantics are those of events, as described above. For example, the periodic(@S,E,5) in rule pp1 denotes an infinite stream of periodic event tuples generated at node S every 5 seconds with random identifier E. 7 A hard-state rule contains only hard-state predicates in the rule head and body. 8 A soft-state rule contains at least one soft-state predicate in the rule head or body. Soft-state rules are further classified as follows. 9 A pure soft-state rule has a soft-state predicate in the rule head, and at least one soft-state predicate in the rule body.