English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Guaranteeing the validity of concurrent operations on distributed objects isa key property for ensuring reliability and consistency in distributed systems.Usually, the methods for validating these operations, if present, are wired inthe object implementation. In this work, we formalize the notion of a {\emvalidated object}, decoupling the object operations and properties from thevalidation procedure. We consider two types of objects, satisfying differentlevels of consistency: the validated {\em totally-ordered} object, offering atotal ordering of its operations, and its weaker variant, the validated {\emregular} object. We provide conditions under which it is possible to implementthese objects. In particular, we show that crash-tolerant implementations ofvalidated regular objects are always possible in an asynchronous system with amajority of correct processes. However, for validated totally-ordered objects,consensus is always required if a property of the object we introduce in thiswork, {\em persistent validity,} does not hold. Persistent validity combinedwith another new property, {\em persistent execution}, allows consensus-freecrash-tolerant implementations of validated totally-ordered objects. Wedemonstrate the utility of validated objects by considering severalapplications conforming to our formalism.

Validated Objects: Specification, Implementation, and Applications