16,289 research outputs found
The Festival Internacional de Teatro de La Habana (FITH) and the Festival de MĂ©xico (fmx): between Place and Placelessness
Causal Consistency for Reversible Multiparty Protocols
In programming models with a reversible semantics, computational steps can be
undone. This paper addresses the integration of reversible semantics into
process languages for communication-centric systems equipped with behavioral
types. In prior work, we introduced a monitors-as-memories approach to
seamlessly integrate reversible semantics into a process model in which
concurrency is governed by session types (a class of behavioral types),
covering binary (two-party) protocols with synchronous communication. The
applicability and expressiveness of the binary setting, however, is limited.
Here we extend our approach, and use it to define reversible semantics for an
expressive process model that accounts for multiparty (n-party) protocols,
asynchronous communication, decoupled rollbacks, and abstraction passing. As
main result, we prove that our reversible semantics for multiparty protocols is
causally-consistent. A key technical ingredient in our developments is an
alternative reversible semantics with atomic rollbacks, which is conceptually
simple and is shown to characterize decoupled rollbacks.Comment: Extended, revised version of a PPDP'17 paper
(https://doi.org/10.1145/3131851.3131864
Session Types with Runtime Adaptation: Overview and Examples
In recent work, we have developed a session types discipline for a calculus
that features the usual constructs for session establishment and communication,
but also two novel constructs that enable communicating processes to be
stopped, duplicated, or discarded at runtime. The aim is to understand whether
known techniques for the static analysis of structured communications scale up
to the challenging context of context-aware, adaptable distributed systems, in
which disciplined interaction and runtime adaptation are intertwined concerns.
In this short note, we summarize the main features of our session-typed
framework with runtime adaptation, and recall its basic correctness properties.
We illustrate our framework by means of examples. In particular, we present a
session representation of supervision trees, a mechanism for enforcing
fault-tolerant applications in the Erlang language.Comment: In Proceedings PLACES 2013, arXiv:1312.221
Is the European Central Bank (and the United States Federal Reserve) predictable?
The objective of this paper is to examine the predictability of the monetary policy decisions of the Governing Council of the ECB and the transmission of the unexpected component of the monetary policy decisions to the yield curve. We find, using new methodologies, that markets do not fully predict the ECB decisions but the lack of perfect predictability is comparable with the results found for the United States Federal Reserve. We also find that the impact of monetary policy shocks on bond yields declines with the maturity of the bonds, and that this impact is significantly lower when the shock stems from a monetary policy meeting of the ECB. Using implicit rates instead of bond yields, we find evidence that the market views the ECB as credible. JEL Classification: C22, E52
Self-Adaptation and Secure Information Flow in Multiparty Structured Communications: A Unified Perspective
We present initial results on a comprehensive model of structured
communications, in which self- adaptation and security concerns are jointly
addressed. More specifically, we propose a model of self-adaptive, multiparty
communications with secure information flow guarantees. In this model, security
violations occur when processes attempt to read or write messages of
inappropriate security levels within directed exchanges. Such violations
trigger adaptation mechanisms that prevent the violations to occur and/or to
propagate their effect in the choreography. Our model is equipped with local
and global mechanisms for reacting to security violations; type soundness
results ensure that global protocols are still correctly executed, while the
system adapts itself to preserve security.Comment: In Proceedings BEAT 2014, arXiv:1408.556
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