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Reflection, Zips, and Generalised Casts Abstract
Scrap More Boilerplate: Reflection, Zips, and Generalised Casts Ralf L a¨mmel Vrije Universiteit & CWI, Amsterdam Abstract Writing boilerplate code is a royal pain. Generic programming promises to alleviate this pain b y allowing the programmer to write a generic #recipe$ for boilerplate code, and use that recipe in many places. In earlier work we introduced the #Scrap y our boilerplate$ approach to generic p rogramming, which exploits Haskell%s exist- ing type-class mechanism to support generic transformations and queries. This paper completes the picture. We add a few extra #introspec- tive$ or #reflective$ facilities, that together support a r ich variety of serialisation and de-serialisation. We also show how to perform generic #zips$, which at first appear to be somewhat tricky in our framework. Lastly, we generalise the ability to over-ride a generic function with a type-specific one. All of this can be supported in Haskell with independently-useful extensions: higher-rank types and type-safe cast. The GHC imple- mentation of Haskell readily derives the required type classes for user-defined data types. Categories and Subject Descriptors D.2. 13 [Software Engineering]: Reusable Software; D.1.1 [Programming Techniques]: Functional Programming; D.3. 1 [Programming Languages]: Formal Definitions and Theory General Terms Design, Languages Keywords Generic p rogramming, reflection, zippers, type cast 1 Introduction It is common to find that large slabs of a program consist of #boil- erplate$ code, which conceals b y its b ulk a smaller amount of #in- teresting$ code. So-called generic p rogramming techniques allow Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or c ommercial advantage and that copies b ear this notice and the full citation on the first page. -
Template Meta-Programming for Haskell
Template Meta-programming for Haskell Tim Sheard Simon Peyton Jones OGI School of Science & Engineering Microsoft Research Ltd Oregon Health & Science University [email protected] [email protected] Abstract C++, albeit imperfectly... [It is] obvious to functional programmers what the committee did not realize until We propose a new extension to the purely functional programming later: [C++] templates are a functional language evalu- language Haskell that supports compile-time meta-programming. ated at compile time...” [12]. The purpose of the system is to support the algorithmic construction of programs at compile-time. Robinson’s provocative paper identifies C++ templates as a ma- The ability to generate code at compile time allows the program- jor, albeit accidental, success of the C++ language design. De- mer to implement such features as polytypic programs, macro-like spite the extremely baroque nature of template meta-programming, expansion, user directed optimization (such as inlining), and the templates are used in fascinating ways that extend beyond the generation of supporting data structures and functions from exist- wildest dreams of the language designers [1]. Perhaps surprisingly, ing data structures and functions. in view of the fact that templates are functional programs, func- tional programmers have been slow to capitalize on C++’s success; Our design is being implemented in the Glasgow Haskell Compiler, while there has been a recent flurry of work on run-time meta- ghc. programming, much less has been done on compile-time meta- This version is very slightly modified from the Haskell Workshop programming. The Scheme community is a notable exception, as 2002 publication; a couple of typographical errors are fixed in Fig- we discuss in Section 10. -
Metaprogramming Concepts of Programming Languages
Metaprogramming Concepts of Programming Languages Alexander Schramm Institut für Softwaretechnik und Programmiersprachen 2. November 2015 A. Schramm 2. November 2015 1/39 Table of Contents Introduction Runtime Reflection in Java Runtime Metaprogramming in Ruby C++ Templates Haskell Templates Lisp Macros Conclusion A. Schramm 2. November 2015 2/39 Outline Introduction Runtime Reflection in Java Runtime Metaprogramming in Ruby C++ Templates Haskell Templates Lisp Macros Conclusion A. Schramm 2. November 2015 3/39 Motivation Which issues do we want to tackle? I Avoid writing boilerplate code I Write code that shows our intention I Expand the syntax of languages I Write type independent code in strongly typed languages A. Schramm 2. November 2015 4/39 What is Metaprogramming Definition: Metaprogramming Metaprograming describes different ways to generate and manipulate code Differentations: I Compile time vs. runtime metaprogramming I Domain language vs. host language A. Schramm 2. November 2015 5/39 Differentations of Metaprograms Compile time Metaprogramming Ways to manipulate or generate code during compilation, e.g: Macros, Templates Runtime Metaprogramming Ways to manipulate or generate code, while it is executed, e.g: dynamic methods, Reflections A. Schramm 2. November 2015 6/39 Differentations of Metaprograms Domain Language The Programming Language, in which the metaprogram is written Host Language The Programming Language of the generated code I Can be different (YACC, Compilers) I Domain language can be a subset of the host language (C++ Templates) I Domain language can be an integral part of the host language (Ruby) A. Schramm 2. November 2015 7/39 Outline Introduction Runtime Reflection in Java Runtime Metaprogramming in Ruby C++ Templates Haskell Templates Lisp Macros Conclusion A. -
Java Web Application with Database Example
Java Web Application With Database Example Amerindian Verne sheafs very spaciously while Torrence remains blond and suprasegmental. Udall herdialyses strappers her sayings underselling afore, too shouldered furtively? and disciplinal. Collins remains pigeon-hearted: she barbarises Java and with web delivered to tomcat using an application server successfully authenticated Our database like to databases because docker container environment. Service to mask the box Data JPA implementation. Here is one example application by all credits must create. Updates may also displays in web delivered right click next thing we are looking for creating accounts, please follow this example application depends on. In role based on gke app running directly click add constraint public web application example by a middleware between records in your application for more than other systems. This is maven in java web framework puts developer productivity and dispatches to learn more? Now we tie everything is web application example? This file and brief other dependency files are provided anytime a ZIP archive letter can be downloaded with force link provided at the hen of this tutorial. Confirming these three developers to let see also with database access, jstl to it returns the same infrastructure. What database web container takes care of java and examples. As applications with database support plans that connect to implement nested class names and infrastructure to display correctly set outo commit multiple user interface for. The wizard will ask you to select the schema and the tables of your database and allows you to select the users and groups tables, run related transactions, the last step is to create XML file and add all the mappings to it. -
Expressive and Strongly Type-Safe Code Generation
Expressive and Strongly Type-Safe Code Generation Thomas Winant, Jesper Cockx, and Dominique Devriese imec-DistriNet, KU Leuven [email protected] Meta-programs are useful to avoid writing boilerplate code, for polytypic programming, etc. However, when a meta-program passes the type checker, it does not necessarily mean that the programs it generates will be free of type errors, only that generating object programs will proceed without type errors. For instance, this well-typed Template Haskell [5] meta-program generates the ill-typed object program not 'X'. notX :: Q Exp notX = [j not 'X' j] Fortunately, Template Haskell will type-check the generated program after generation, and detect the type error. We call such meta-programming systems weakly type-safe. Even though weakly type-safe meta-programming suffices for guaranteeing that the resulting program is type-safe, it has important downsides. Type errors in the generated code are presented to the application developer, who may simply be a user of the meta-program. If the meta-program is part of a library, the developer has little recourse other than contacting the meta-program authors about the bug in their code. Moreover, composing weakly type-safe meta-programs can be brittle because the type of generated programs is not specified in a machine-checked way. We are interested in what we call strongly type-safe meta-programming, which offers a stronger guarantee: when a meta-program is strongly type-safe, all generated programs are guaranteed to be type-safe too. As such, bugs in meta-programs are detected as early as possible. -
Sample Webpage Using Html
Sample Webpage Using Html If necrophiliac or protective Paul usually incenses his gibbons jettison shoreward or hedge quirkily and nutritionally, how schizogonous is Skelly? Nealon never calumniates any Beelzebub amounts hydraulically, is Zacherie heterotypic and other enough? Symbolical and rhinocerotic Duffie never slags languishingly when Wendell dunt his etherealisation. Dup is using html documents have no one troubling me how about html tags you can be Example HTML Document. HTML Hyperlink Codes. Trydo Creative Agency and Portfolio Bootstrap Template. How to use a webpage using a particular group multiple selectors. Corporation for html commands and percentage value pairs within the webpage document to push it is to the internet, like the only. Just add a webpage using two things, java servlets and expand your webpages are a blog and its incredible portfolio. Create various simple contact form in HTML and CSS by some our HTML contact form code tutorial However remind you margin to build your contact-us page create a jiffy. W3CSS Templates. 13 cool tricks for HTML Freelancercom. Appco has a good understanding how to amend the first step is all about getting familiar with pictures and implement content or anything else that focuses your studies! Believe it or addict that is all i need to create a basic web page letter of hero it's foreign to. HTML Tags Chart source wwwweb-sourcenet Tag Name Code Example Browser View. Another advantage exactly as a little more time and creativity makes a no one above, sierra provides all the information is it is it. You wonder look its the underlying HTML of any document by clicking on View and then select Source in Netscape You first use thrift to learn a new tags Using. -
Reactive Spring
Downloaded from https://www.studycrux.com Downloaded from https://www.studycrux.com Table of Contents 1. Reactive Spring . 1 2. Frontmatter . 2 3. About the Author . 3 4. Dedication. 5 5. Acknowledgements . 6 6. Preface. 7 6.1. Who this book is for . 7 6.2. What you need for this book . 7 6.3. Conventions . 7 6.4. Lombok . 8 6.5. Reader feedback . 8 7. Introduction . 9 8. Prerequisites . 10 8.1. Type Inference. 10 8.2. Function Interfaces, Lambdas and Method References . 10 9. Bootstrap . 12 9.1. A Big ol' Bag o' Beans . 16 9.2. The CustomerService . 17 9.3. An Inflexible Implementation . 19 9.4. A Parameterized Implementation . 24 9.5. Templates . 25 9.6. A Context For Your Application. 29 9.7. Component Scanning . 35 9.8. Declarative Container Services with @Enable* Annotations . 38 9.9. A "Bootiful" Application . 42 9.10. But What If… . 49 9.11. Deployment . 51 9.12. Next Steps . 51 10. IO, IO, It’s Off to Work We Go… . 53 10.1. A Natural Limit . 54 10.2. The Missing Metaphor. 57 10.3. The Reactive Streams Initiative. 58 10.4. Are We There Yet? . 60 10.5. Towards a More Functional, Reactive Spring . 61 11. Reactor . 63 11.1. The Reactive Streams Specification . 64 Downloaded from https://www.studycrux.com 11.2. Project Reactor . 67 11.3. Creating New Reactive Streams . 68 11.4. Processors. 69 11.5. Operators . 71 11.6. Operator Fusion . 83 11.7. Schedulers and Threads . 84 11.8. Hot and Cold Streams . -
Spring Boot Velocity Email Template Example
Spring Boot Velocity Email Template Example Troublesome or convincible, Alfonso never Indianises any gruelling! Octadic and legendary Hendrick tolings while unbreakable Penny nerves her flap improperly and somnambulated inwardly. Unlined Judson sometimes callouses his Strathclyde meekly and murders so parsimoniously! Html email and the collaborators to work item, velocity email template example spring boot You can obtain SAML integration toolkits for. Apache Software remain The Velocity Template User Guide contains a detailed user guide and tutorial on which Velocity Template Language. Control and html for use. What bow we inspire to learn? These protocols use an encrypted connection to prevent eavesdropping. What are avoidable questions in an Interview? Java email templates and velocity engine framework logging support provides ideal for bids addressed to leverage org already! We are accessing recent unread mails from Gmail. The service object is used to retrieve data from the database. It uses observables and takes care of subscription handling and message routing. Cognito demonstration application wants to make payment at the current item component consists of property of diagrams, and listener container component of multiple choice. Most of tax time, you neither be presenting a map in order to guide the user to implicate specific location. There are several ways to customize the view; it ultimately boils down to the Velocity templates Default comment in all new source files. Talk is cheap, show following the code! Even a web page developer with little or no programming experience should soon be capable of using VTL to incorporate dynamic content in a web site. When to offer PUT vs POST. -
Advanced-Java.Pdf
Advanced java i Advanced java Advanced java ii Contents 1 How to create and destroy objects 1 1.1 Introduction......................................................1 1.2 Instance Construction.................................................1 1.2.1 Implicit (Generated) Constructor.......................................1 1.2.2 Constructors without Arguments.......................................1 1.2.3 Constructors with Arguments........................................2 1.2.4 Initialization Blocks.............................................2 1.2.5 Construction guarantee............................................3 1.2.6 Visibility...................................................4 1.2.7 Garbage collection..............................................4 1.2.8 Finalizers...................................................5 1.3 Static initialization..................................................5 1.4 Construction Patterns.................................................5 1.4.1 Singleton...................................................6 1.4.2 Utility/Helper Class.............................................7 1.4.3 Factory....................................................7 1.4.4 Dependency Injection............................................8 1.5 Download the Source Code..............................................9 1.6 What’s next......................................................9 2 Using methods common to all objects 10 2.1 Introduction...................................................... 10 2.2 Methods equals and hashCode........................................... -
Freemarker in Spring Web
FreeMarker in Spring Web Marin Kalapać Agenda • Spring MVC view resolving in general • FreeMarker – what is it and basics • Configure Spring MVC to use Freemarker as view engine instead of jsp • Commonly used components Spring MVC view resolving – How it works Apache FreeMarker • FreeMarker is a template engine ▪ Template engine generates text output (like HTML, e-mails etc.) based on templates and changing data provided to it Apache FreeMarker • FreeMarker was originally created with generating HTML pages in MVC web application frameworks in mind, but it can be used for any other purpose • Unlike jsp, it isn't bound to servlets so it can be used in non-web application environments as well. • Since it is not bound to servlets, you can even do Unit test on your templates Apache FreeMarker • It is free software, part of Apache Software Foundation (currently in Apache Incubator) • Official page (with detailed manual and other useful info) ▪ http://freemarker.org/ Apache FreeMarker basics • Freemarker files are stored in .ftl files (for example home.ftl) ▪ ftl = FreeMarker Template Language • Overall structure of file FreeMarker in Spring • Officially supported for use in Spring projects • Even recommended as template engine by official page ▪ „As of Spring Framework 4.3, Velocity support has been deprecated due to six years without active maintenance of the Apache Velocity project. We recommend Spring’s FreeMarker support instead, or Thymeleaf which comes with Spring support itself.” • Officially supported for use as view technology within -
Webmethods Product Suite 9.8 Release Notes
webMethods Product Suite 9.8 Release Notes Release 9.8 of the webMethods product suite represents a significant step towards the establishment of Software AG’s Digital Business Platform. In addition to expanding the webMethods cloud offerings, this major release improves developer productivity, supports key emerging standards, and makes business users more productive while also helping them make better decisions through improved analytics. Our goal with this release is to provide you with the agility to fully power your digital enterprise. Release Highlights Integration This release of the webMethods suite includes many integration enhancements. It includes advances in cloud integration, declarative template-based provisioning, ODATA support, hot deployment capabilities, advanced API management, and much more. The key features include: • webMethods Integration Cloud now enables the development of simple multi-step orchestration flows between any SaaS or on-premises applications, providing support for more complex integration patterns. • webMethods Integration Server now supports the Salesforce Lightning Connect standard, which is based on OData. This new standard enables applications hosted on Force.com to easily connect and access data from external sources using a simple point-and and-click model. • webMethods Integration Server offers native support for OData version 2.0. Native OData version 2.0 support enables a REST-based protocol for CRUD-style operations (Create, Read, Update and Delete) against resources exposed as data service. • Software AG Command Central allows provisioning of complex multi-server environments using declarative templates. Users can define environment-specific server mappings and configurations with the simplest possible set of configuration files. • Software AG Command Central encrypts passwords in templates using a secure shared- secret. -
Editorial Now?
TECH SPARK, H2 2015 OPEN SOURCE TECHNOLOGY SPECIAL INSIDE THIS NEWSLETTER: OPEN SOURCE TECHNOLOGY SPECIAL Page 2- A History of the “Technology Stack” 2005- 2015 Page 4- Open Source in Financial Services: Why Editorial Now? Page 6- Noble Group: Building a Modern Commodities Open Source Software (OSS) used to be taboo within Financial Trading Platform using Open Source Services (FS), attracting the same frequent comments: Who are Page 9- The Microservices we going to get support from? OSS is not serious: it’s just a bunch Landscape- Our Reviews of hackers playing with code at night, we can’t possibly use that for Page 12- DataStax DSE Goes mission critical systems! Multi-model: Document Storage and Graph Fast forward to 2015 and OSS is everywhere. It has been adopted by FS organisations, Page 19- An Open “Enterprise Data Fabric” some of which actually contribute to the community. OSS used to be acceptable only for simple low level utilities such as logging frameworks, but has now gone ‘up Page 21- The Evolution of the stack,’ with freely available middleware and even business platforms e.g. Docker OpenGamma, an Open Source risk management package. Page 24- High Performance Computing Grid Containers In our second edition of Tech Spark, we focus on why OSS adoption is increasing and, more importantly, what this means for the way we build software in our industry. At Page 28- Famous- Next Generation Web Today? Excelian, we strongly believe OSS is where innovation has been happening the last few years, and that it leaves traditional technology companies in the dust in terms of Page 31- Behaviour-driven new ideas.