Versatile event correlation with algebraic effects
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Authors
Bračevac, Oliver
Amin, Nada
Salvaneschi, Guido
Erdweg, Sebastian
Eugster, Patrick
Mezini, Mira
Publication Date
2018-07-30Journal Title
Proceedings of the ACM on Programming Languages
ISSN
2475-1421
Volume
2
Issue
ICFP
Pages
1-31
Language
en
Type
Conference Object
Metadata
Show full item recordCitation
Bračevac, O., Amin, N., Salvaneschi, G., Erdweg, S., Eugster, P., & Mezini, M. (2018). Versatile event correlation with algebraic effects. Proceedings of the ACM on Programming Languages, 2 (ICFP), 1-31. https://doi.org/10.1145/3236762
Abstract
We present the first language design to uniformly express variants of n-way joins over asynchronous event
streams from different domains, e.g., stream-relational algebra, event processing, reactive and concurrent
programming. We model asynchronous reactive programs and joins in direct style, on top of algebraic
effects and handlers. Effect handlers act as modular interpreters of event notifications, enabling fine-grained
control abstractions and customizable event matching. Join variants can be considered as cartesian product
computations with “degenerate” control flow, such that unnecessary tuples are not materialized a priori. Based
on this computational interpretation, we decompose joins into a generic, naïve enumeration procedure of
the cartesian product, plus variant-specific extensions, represented in terms of user-supplied effect handlers.
Our microbenchmarks validate that this extensible design avoids needless materialization. Alongside a formal
semantics for joining and prototypes in Koka and multicore OCaml, we contribute a systematic comparison of
the covered domains and features.
Sponsorship
ERC, Advanced Grant No. 321217
ERC, Consolidator Grant No. 617805
DFG, SFB 1053
DFG, SA 2918/2-1
Identifiers
External DOI: https://doi.org/10.1145/3236762
This record's URL: https://www.repository.cam.ac.uk/handle/1810/282854