The Essence of Reactive Programming a Theoretical Approach
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Working with Unreliable Observers Using Reactive Extensions
Master thesis WORKING WITH UNRELIABLE OBSERVERS USING REACTIVE EXTENSIONS November 10, 2016 Dorus Peelen (s4167821) Computing science Radboud University [email protected] — Supervisors: Radboud University: Rinus Plasmeijer Aia Software: Jeroen ter Hofstede Contents 1 Introduction 5 1.1 Overview of thesis . .7 2 Background 8 2.1 Aia Software . .8 2.2 Current situation . .8 2.3 The use case . .9 2.3.1 Technical details . 10 2.3.2 Potential problems . 11 2.4 Problem description . 11 2.5 Desired Properties of the new system . 11 3 Overview of Rx 13 3.1 Basic Ideas of Rx . 13 3.2 Observer and Observable . 15 3.3 Hot vs Cold observables . 15 3.4 Marble diagrams . 16 3.5 Transformations on Event Streams . 16 3.6 Schedulers . 16 3.7 Control process in Rx . 17 3.8 Interactive vs reactive . 18 3.9 Push-back and backpressure . 18 3.10 Operators with unbounded Queue . 19 3.11 Explanation and example of different operators in Rx . 19 3.11.1 Select .................................. 19 3.11.2 SelectMany ............................... 20 3.11.3 Where .................................. 20 3.11.4 Delay .................................. 20 3.11.5 Merge and Concat ........................... 21 3.11.6 Buffer and Window ........................... 21 3.11.7 GroupBy ................................. 21 3.11.8 Amb .................................... 21 3.11.9 Debounce, Sample and Throttle ................... 22 3.11.10 ObserveOn ................................ 22 3.12 Related work . 22 3.12.1 TPL . 23 3.12.2 iTasks . 23 4 The experiment 25 4.1 Important properties . 25 4.2 Test architecture . 26 4.2.1 Design . 26 2 4.2.2 Concepts . -
Third Party Software Component List: Targeted Use: Briefcam® Fulfillment of License Obligation for All Open Sources: Yes
Third Party Software Component List: Targeted use: BriefCam® Fulfillment of license obligation for all open sources: Yes Name Link and Copyright Notices Where Available License Type OpenCV https://opencv.org/license.html 3-Clause Copyright (C) 2000-2019, Intel Corporation, all BSD rights reserved. Copyright (C) 2009-2011, Willow Garage Inc., all rights reserved. Copyright (C) 2009-2016, NVIDIA Corporation, all rights reserved. Copyright (C) 2010-2013, Advanced Micro Devices, Inc., all rights reserved. Copyright (C) 2015-2016, OpenCV Foundation, all rights reserved. Copyright (C) 2015-2016, Itseez Inc., all rights reserved. Apache Logging http://logging.apache.org/log4cxx/license.html Apache Copyright © 1999-2012 Apache Software Foundation License V2 Google Test https://github.com/abseil/googletest/blob/master/google BSD* test/LICENSE Copyright 2008, Google Inc. SAML 2.0 component for https://github.com/jitbit/AspNetSaml/blob/master/LICEN MIT ASP.NET SE Copyright 2018 Jitbit LP Nvidia Video Codec https://github.com/lu-zero/nvidia-video- MIT codec/blob/master/LICENSE Copyright (c) 2016 NVIDIA Corporation FFMpeg 4 https://www.ffmpeg.org/legal.html LesserGPL FFmpeg is a trademark of Fabrice Bellard, originator v2.1 of the FFmpeg project 7zip.exe https://www.7-zip.org/license.txt LesserGPL 7-Zip Copyright (C) 1999-2019 Igor Pavlov v2.1/3- Clause BSD Infralution.Localization.Wp http://www.codeproject.com/info/cpol10.aspx CPOL f Copyright (C) 2018 Infralution Pty Ltd directShowlib .net https://github.com/pauldotknopf/DirectShow.NET/blob/ LesserGPL -
An Opinionated Guide to Technology Frontiers
TECHNOLOGY RADAR An opinionated guide to technology frontiers Volume 24 #TWTechRadar thoughtworks.com/radar The Technology Advisory Board (TAB) is a group of 20 senior technologists at Thoughtworks. The TAB meets twice a year face-to-face and biweekly by phone. Its primary role is to be an advisory group for Thoughtworks CTO, Contributors Rebecca Parsons. The Technology Radar is prepared by the The TAB acts as a broad body that can look at topics that affect technology and technologists at Thoughtworks. With the ongoing global pandemic, we Thoughtworks Technology Advisory Board once again created this volume of the Technology Radar via a virtual event. Rebecca Martin Fowler Bharani Birgitta Brandon Camilla Cassie Parsons (CTO) (Chief Scientist) Subramaniam Böckeler Byars Crispim Shum Erik Evan Fausto Hao Ian James Lakshminarasimhan Dörnenburg Bottcher de la Torre Xu Cartwright Lewis Sudarshan Mike Neal Perla Rachel Scott Shangqi Zhamak Mason Ford Villarreal Laycock Shaw Liu Dehghani TECHNOLOGY RADAR | 2 © Thoughtworks, Inc. All Rights Reserved. About the Radar Thoughtworkers are passionate about technology. We build it, research it, test it, open source it, write about it and constantly aim to improve it — for everyone. Our mission is to champion software excellence and revolutionize IT. We create and share the Thoughtworks Technology Radar in support of that mission. The Thoughtworks Technology Advisory Board, a group of senior technology leaders at Thoughtworks, creates the Radar. They meet regularly to discuss the global technology strategy for Thoughtworks and the technology trends that significantly impact our industry. The Radar captures the output of the Technology Advisory Board’s discussions in a format that provides value to a wide range of stakeholders, from developers to CTOs. -
Front-End Development with ASP.NET Core, Angular, And
Table of Contents COVER TITLE PAGE FOREWORD INTRODUCTION WHY WEB DEVELOPMENT REQUIRES POLYGLOT DEVELOPERS WHO THIS BOOK IS FOR WHAT THIS BOOK COVERS HOW THIS BOOK IS STRUCTURED WHAT YOU NEED TO USE THIS BOOK CONVENTIONS SOURCE CODE ERRATA 1 What’s New in ASP.NET Core MVC GETTING THE NAMES RIGHT A BRIEF HISTORY OF THE MICROSOFT .NET WEB STACK .NET CORE INTRODUCING ASP.NET CORE NEW FUNDAMENTAL FEATURES OF ASP.NET CORE AN OVERVIEW OF SOME ASP.NET CORE MIDDLEWARE ASP.NET CORE MVC SUMMARY 2 The Front‐End Developer Toolset ADDITIONAL LANGUAGES YOU HAVE TO KNOW JAVASCRIPT FRAMEWORKS CSS FRAMEWORKS PACKAGE MANAGERS TASK RUNNERS SUMMARY 3 Angular in a Nutshell ANGULAR CONCEPTS THE LANGUAGE OF ANGULAR SETTING UP AN ANGULAR PROJECT THE STRUCTURE OF AN ANGULAR APP DATA BINDING DIRECTIVES SERVICES AND DEPENDECY INJECTION MULTIPLE COMPONENTS INPUT AND OUTPUT PROPERTIES TALKING TO THE BACK END USING ANGULAR WITH ASP.NET MVC VISUAL STUDIO 2017 SUPPORT FOR ANGULAR SUMMARY 4 Bootstrap in a Nutshell INTRODUCTION TO BOOTSTRAP BOOTSTRAP STYLES COMPONENTS JAVASCRIPT CUSTOMIZING BOOTSTRAP WITH LESS BOOTSTRAP SUPPORT IN VISUAL STUDIO 2017 AND ASP.NET CORE SUMMARY 5 Managing Dependencies with NuGet and Bower GENERAL CONCEPTS NUGET NPM (NODE.JS PACKAGE MANAGER) BOWER SUMMARY 6 Building Your Application with Gulp and webpack WHAT FRONT‐END BUILD SYSTEMS ARE FOR A DEEPER LOOK AT GULP INTRODUCTION TO WEBPACK VISUAL STUDIO 2017 AND BUILD SYSTEMS SUMMARY 7 Deploying ASP.NET Core THE NEW HOSTING MODEL OF ASP.NET CORE INSTALLING ON INTERNET INFORMATION SERVICES ON PREMISE -
The Implementation of Metagraph Agents Based on Functional Reactive Programming
______________________________________________________PROCEEDING OF THE 26TH CONFERENCE OF FRUCT ASSOCIATION The Implementation of Metagraph Agents Based on Functional Reactive Programming Valeriy Chernenkiy, Yuriy Gapanyuk, Anatoly Nardid, Nikita Todosiev Bauman Moscow State Technical University, Moscow, Russia [email protected], [email protected], [email protected], [email protected] Abstract—The main ideas of the metagraph data model and there is no doubt that it is the functional approach in the metagraph agent model are discussed. The metagraph programming that makes it possible to make such approach for semantic complex event processing is presented. implementation effectively. Therefore, the work is devoted to The metagraph agent implementation based on Functional the implementation of a multi-agent paradigm using functional Reactive Programming is proposed. reactive programming. The advantage of this implementation is that agents can work in parallel, supporting a functional I. INTRODUCTION reactive paradigm. Currently, models based on complex networks are The article is organized as follows. The section II discusses increasingly used in various fields of science, from the main ideas of the metagraph model. The section III mathematics and computer science to biology and sociology. discusses the metagraph agent model. The section IV discusses According to [1]: “a complex network is a graph (network) the Semantic Complex Event Processing approach and its’ with non-trivial topological features – features that do not occur correspondence to the metagraph model. The section V (which in simple networks such as lattices or random graphs but often is the novel result presented in the article) discusses the occur in graphs modeling of real systems.” The terms “complex metagraph agent implementation based on Functional Reactive network” and “complex graph” are often used synonymously. -
Rxada: an Ada Implementation of the Reactivex API - 1 PREVIOUSLY, in ADA-EUROPE 2007
RxAda: An Ada implementation of the ReactiveX API Alejandro R. Mosteo 2017-jun-13 2017-jun-13 - RxAda: An Ada implementation of the ReactiveX API - 1 PREVIOUSLY, IN ADA-EUROPE 2007... SANCTA: An Ada 2005 General-Purpose Architecture for Mobile Robotics Research 2017-jun-13 - RxAda: An Ada implementation of the ReactiveX API - 2 ABOUT ME Robotics, Perception, and Real-Time group (RoPeRT) http://robots.unizar.es/ Universidad de Zaragoza, Spain 2017-jun-13 - RxAda: An Ada implementation of the ReactiveX API - 3 CONTENTS • Motivation • What is ReactiveX – Language agnostic – Java – Ada • RxAda – Design challenges/decisions – Current implementation status – Future steps 2017-jun-13 - RxAda: An Ada implementation of the ReactiveX API - 4 PERSONAL MOTIVATION • Android development – Questionable design decisions for background tasks that interact with the GUI • Found RxJava – Simpler, saner way of doing multitasking – Documented comprehensively – Very active community in the Rx world • Achievable in Ada? – Aiming for the RxJava simplicity of use 2017-jun-13 - RxAda: An Ada implementation of the ReactiveX API - 5 EVENT-DRIVEN / ASYNCHRONOUS SYSTEMS <User drags map> ↓ Find nearby items ↓⌛ Request images ↓⌛↓⌛↓⌛↓⌛ Crop/Process image ↓⌛ Update GUI markers 2017-jun-13 - RxAda: An Ada implementation of the ReactiveX API - 6 OVERVIEW Event-driven systems ↓ Reactive Programming (philosophy) ↓ ReactiveX / Rx (specification) ↓ Rx.Net, RxJava, RxJS, RxC++, … ↓ RxAda 2017-jun-13 - RxAda: An Ada implementation of the ReactiveX API - 7 REACTIVE MANIFESTO (2014-sep-16 -
Functional Reactive Programming, Refactored
Functional Reactive Programming, Refactored Ivan Perez Manuel Barenz¨ Henrik Nilsson University of Nottingham University of Bamberg University of Nottingham [email protected] [email protected] [email protected] Abstract 18] and Reactive Values [21]. Through composition of standard Functional Reactive Programming (FRP) has come to mean many monads like reader, exception, and state, any desirable combination things. Yet, scratch the surface of the multitude of realisations, and of time domain, dynamic system structure,flexible handling of I/O there is great commonality between them. This paper investigates and more can be obtained in an open-ended manner. this commonality, turning it into a mathematically coherent and Specifically, the contributions of this paper are: practical FRP realisation that allows us to express the functionality We define a minimal Domain-Specific Language of causal • of many existing FRP systems and beyond by providing a minimal Monadic Stream Functions (MSFs), give them precise mean- FRP core parametrised on a monad. We give proofs for our theoreti- ing and analyse the properties they fulfill. cal claims and we have verified the practical side by benchmarking We explore the use of different monads in MSFs, how they nat- a set of existing, non-trivial Yampa applications running on top of • our new system with very good results. urally give rise to known reactive constructs, like termination, switching, higher-order, parallelism and sinks, and how to com- Categories and Subject Descriptors D.3.3 [Programming Lan- pose effects at a stream level using monad transformers [15]. guages]: Language Constructs and Features – Control Structures We implement three different FRP variants on top of our frame- • Keywords functional reactive programming, reactive program- work: 1) Arrowized FRP, 2) Classic FRP and 3) Signal/Sink- ming, stream programming, monadic streams, Haskell based reactivity. -
Flapjax: Functional Reactive Web Programming
Flapjax: Functional Reactive Web Programming Leo Meyerovich Department of Computer Science Brown University [email protected] 1 People whose names should be before mine. Thank you to Shriram Krishnamurthi and Gregory Cooper for ensuring this project’s success. I’m not sure what would have happened if not for the late nights with Michael Greenberg, Aleks Bromfield, and Arjun Guha. Peter Hopkins, Jay McCarthy, Josh Gan, An- drey Skylar, Jacob Baskin, Kimberly Burchett, Noel Welsh, and Lee Butterman provided invaluable input. While not directly involved with this particular project, Kathi Fisler and Michael Tschantz have pushed me along. 1 Contents 4.6. Objects and Collections . 32 4.6.1 Delta Propagation . 32 1. Introduction 3 4.6.2 Shallow vs Deep Binding . 33 1.1 Document Approach . 3 4.6.3 DOM Binding . 33 2. Background 4 4.6.4 Server Binding . 33 2.1. Web Programming . 4 4.6.5 Disconnected Nodes and 2.2. Functional Reactive Programming . 5 Garbage Collection . 33 2.2.1 Events . 6 2.2.2 Behaviours . 7 4.7. Evaluations . 34 2.2.3 Automatic Lifting: Transparent 4.7.1 Demos . 34 Reactivity . 8 4.7.2 Applications . 34 2.2.4 Records and Transparent Reac- 4.8 Errors . 34 tivity . 10 2.2.5 Behaviours and Events: Conver- 4.9 Library vs Language . 34 sions and Event-Based Derivation 10 4.9.1 Dynamic Typing . 34 4.9.2 Optimization . 35 3. Implementation 11 3.1. Topological Evaluation and Glitches . 13 4.9.3 Components . 35 3.1.1 Time Steps . 15 4.9.4 Compilation . -
Coverity Static Analysis
Coverity Static Analysis Quickly find and fix Overview critical security and Coverity® gives you the speed, ease of use, accuracy, industry standards compliance, and quality issues as you scalability that you need to develop high-quality, secure applications. Coverity identifies code critical software quality defects and security vulnerabilities in code as it’s written, early in the development process when it’s least costly and easiest to fix. Precise actionable remediation advice and context-specific eLearning help your developers understand how to fix their prioritized issues quickly, without having to become security experts. Coverity Benefits seamlessly integrates automated security testing into your CI/CD pipelines and supports your existing development tools and workflows. Choose where and how to do your • Get improved visibility into development: on-premises or in the cloud with the Polaris Software Integrity Platform™ security risk. Cross-product (SaaS), a highly scalable, cloud-based application security platform. Coverity supports 22 reporting provides a holistic, more languages and over 70 frameworks and templates. complete view of a project’s risk using best-in-class AppSec tools. Coverity includes Rapid Scan, a fast, lightweight static analysis engine optimized • Deployment flexibility. You for cloud-native applications and Infrastructure-as-Code (IaC). Rapid Scan runs decide which set of projects to do automatically, without additional configuration, with every Coverity scan and can also AppSec testing for: on-premises be run as part of full CI builds with conventional scan completion times. Rapid Scan can or in the cloud. also be deployed as a standalone scan engine in Code Sight™ or via the command line • Shift security testing left. -
Santiago Quintero Pabón –
LIX - École Polytechnique Palaiseau Santiago Quintero France Æ +33 (0) 7 67 39 73 30 Pabón Q [email protected] Contact Information Last Name: Quintero Pabón Given Name: Santiago Birth Date: 21-oct-1994 Nationality: Colombian Education Pontificia Universidad Javeriana Cali, CO + Five years B.Sc. Degree in Computer Science and Engineering, (equivalent to a master degree) 2012-2017 École Polytechnique Palaiseau, FR + PhD in Computer Sciences, Thesis: "Foundational approach to computation in today’s systems" 2018-Current Supervisors: Catuscia Palamidessi, Frank Valencia. Work Experience COMETE at LIX, École Polytechnique Palaiseau, FR + PhD Student 2018-Current AVISPA research group at Pontificia Universidad Javeriana Cali, CO + Research Assistant 2018 PORTAL ACTUALICESE.COM S.A.S. Cali, CO + Development Analyst 2017-2018 COMETE research group at Inria-Saclay Palaiseau, FR + Research Intern November 2017 Pontificia Universidad Javeriana Cali, CO + Teaching Assistant 2014-2016 Teaching Assistant....................................................................................................... Courses: Introduction to Programming, Programming Fundamentals and Structures, Logic in Computer Science, Computability and Formal Languages, Introduction to Systems Modeling. Major Projects............................................................................................................. + October 2015 - June 2016: ’Financial inclusion for the emerging middle class in Colombia’ Designed, prototyped and developed a financial -
Rxpy Documentation Release 3.1.1
RxPY Documentation Release 3.1.1 Dag Brattli Jul 16, 2020 CONTENTS 1 Installation 3 2 Rationale 5 3 Get Started 7 3.1 Operators and Chaining.........................................8 3.2 Custom operator.............................................9 3.3 Concurrency............................................... 10 4 Migration 15 4.1 Pipe Based Operator Chaining...................................... 15 4.2 Removal Of The Result Mapper..................................... 16 4.3 Scheduler Parameter In Create Operator................................. 16 4.4 Removal Of List Of Observables.................................... 17 4.5 Blocking Observable........................................... 17 4.6 Back-Pressure.............................................. 18 4.7 Time Is In Seconds............................................ 18 4.8 Packages Renamed............................................ 18 5 Operators 19 5.1 Creating Observables........................................... 19 5.2 Transforming Observables........................................ 19 5.3 Filtering Observables........................................... 20 5.4 Combining Observables......................................... 20 5.5 Error Handling.............................................. 20 5.6 Utility Operators............................................. 21 5.7 Conditional and Boolean Operators................................... 21 5.8 Mathematical and Aggregate Operators................................. 21 5.9 Connectable Observable Operators.................................. -
Computer Science 1
Computer Science 1 Computer Science Department Website: https://www.cs.uchicago.edu Program of Study The computer science program offers BA and BS degrees, as well as combined BA/MS and BS/MS degrees. Students who earn the BA are prepared either for graduate study in computer science or a career in industry. Students who earn the BS degree build strength in an additional field by following an approved course of study in a related area. The department also offers a minor. Where to Start The Department of Computer Science offers several different introductory pathways into the program. In consultation with their College adviser and the Computer Science Department advisers, students should choose their introductory courses carefully. Some guidelines follow. For students intending to pursue further study in computer science, we recommend CMSC 15100 Introduction to Computer Science I or CMSC 16100 Honors Introduction to Computer Science I as the first course. CMSC 15100 does not assume prior experience or unusually strong preparation in mathematics. Students with programming experience and strong preparation in mathematics should consider CMSC 16100 Honors Introduction to Computer Science I. First-year students considering a computer science major are strongly advised to register for an introductory sequence in the Winter or Spring Quarter of their first year, and it is all but essential that they start the introductory sequence no later than the second quarter of their second year. Students who are not intending to major in computer science, but are interested in getting a rigorous introduction to computational thinking with a focus on applications are encouraged to start with CMSC 12100 Computer Science with Applications I.