Presentation Abstraction Control Pattern Example
Total Page:16
File Type:pdf, Size:1020Kb

Load more
Recommended publications
-
The Future of Embedded Software
The Future of Embedded Software Edward A. Lee Professor, Chair of EE, and Associate Chair of EECS UC Berkeley ARTEMIS 2006 Annual Conference Graz, Austria May 22-24, 2006 Why Embedded Software? Why Now? “Information technology (IT) is on the verge of another revolution. Driven by the increasing capabilities and ever declining costs of computing and communications devices, IT is being embedded into a growing range of physical devices linked together through networks and will become ever more pervasive as the component technologies become smaller, faster, and cheaper... These networked systems of embedded computers ... have the potential to change radically the way people interact with their environment by linking together a range of devices and sensors that will allow information to be collected, shared, and processed in unprecedented ways. ... The use of [these embedded computers] throughout society could well dwarf previous milestones in the information revolution.” National Research Council Report Embedded Everywhere Lee, Berkeley 2 The Key Obstacle to Progress: Gap Between Systems and Computing | Traditional dynamic systems theory needs to adapt to better account for the behavior of software and networks. | Traditional computer science needs to adapt to embrace time, concurrency, and the continuum of physical processes. Lee, Berkeley 3 The Next Systems Theory: Simultaneously Physical and Computational The standard model: Embedded software is software on small computers. The technical problem is one of optimization (coping with limited resources). The Berkeley model: Embedded software is software integrated with physical processes. The technical problem is managing time and concurrency in computational systems. Lee, Berkeley 4 Obstacles in Today’s Technology: Consider Real Time Electronics Technology Delivers Timeliness… … and the overlaying software abstractions discard it. -
Automatic Verification of Java Design Patterns
Automatic Verification of Java Design Patterns Alex Blewitt, Alan Bundy, Ian Stark Division of Informatics, University of Edinburgh 80 South Bridge, Edinburgh EH1 1HN, UK [email protected] [email protected] [email protected] Abstract 2. Design patterns There are a number of books which catalogue and de- Design patterns are widely used by object oriented de- scribe design patterns [4, 1, 6] including an informal de- signers and developers for building complex systems in ob- scription of the key features and examples of their use. ject oriented programming languages such as Java. How- However, at the moment there are no books which attempt ever, systems evolve over time, increasing the chance that to formalise these descriptions, possibly for the following the pattern in its original form will be broken. reasons: We attempt to show that many patterns (implemented in Java) can be verified automatically. Patterns are defined 1. The implementation (and description) of the pattern is in terms of variants, mini-patterns, and constraints in a language-specific. pattern description language called SPINE. These specifi- 2. There are often several ways to implement a pattern cations are then processed by HEDGEHOG, an automated within the same language. proof tool that attempts to prove that Java source code 3. Formal language descriptions are not common within meets these specifications. the object oriented development community. Instead, each pattern is presented as a brief description, and an example of its implementation and use. Designers and developers are then expected to learn the ‘feel’ of a pat- 1. -
One-Slide Summary Lecture Outline
Using Design Patterns #1 One-Slide Summary • Design patterns are solutions to recurring OOP design problems. There are patterns for constructing objects, structuring data, and object behavior . • Since this is PL, we’ll examine how language features like (multiple) inheritance and dynamic dispatch relate to design patterns. #2 Lecture Outline • Design Patterns • Iterator • Observer • Singleton • Mediator #3 1 What is a design pattern? • A solution for a recurring problem in a large object-oriented programming system – Based on Erich Gamma’s Ph.D. thesis, as presented in the “gang of four” book • “Each pattern describes a problem which occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice” – Charles Alexander #4 Types of design patterns • Design patterns can be (roughly) grouped into three categories: • Creational patterns – Constructing objects • Structural patterns – Controlling the structure of a class, e.g. affecting the API or the data structure layout • Behavioral patterns – Deal with how the object behaves #5 Iterator design pattern • Often you may have to move through a collection – Tree (splay, AVL, binary, red-black, etc.), linked list, array, hash table, dictionary, etc. • Easy for arrays and vectors • But hard for more complicated data structures – Hash table, dictionary, etc. • The code doing the iteration should not have to know the details of the data structure -
Design Pattern Interview Questions
DDEESSIIGGNN PPAATTTTEERRNN -- IINNTTEERRVVIIEEWW QQUUEESSTTIIOONNSS http://www.tutorialspoint.com/design_pattern/design_pattern_interview_questions.htm Copyright © tutorialspoint.com Dear readers, these Design Pattern Interview Questions have been designed specially to get you acquainted with the nature of questions you may encounter during your interview for the subject of Design Pattern. As per my experience good interviewers hardly plan to ask any particular question during your interview, normally questions start with some basic concept of the subject and later they continue based on further discussion and what you answer: What are Design Patterns? Design patterns represent the best practices used by experienced object-oriented software developers. Design patterns are solutions to general problems that software developers faced during software development. These solutions were obtained by trial and error by numerous software developers over quite a substantial period of time. What is Gang of Four GOF? In 1994, four authors Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides published a book titled Design Patterns - Elements of Reusable Object-Oriented Software which initiated the concept of Design Pattern in Software development. These authors are collectively known as Gang of Four GOF. Name types of Design Patterns? Design patterns can be classified in three categories: Creational, Structural and Behavioral patterns. Creational Patterns - These design patterns provide a way to create objects while hiding the creation logic, rather than instantiating objects directly using new opreator. This gives program more flexibility in deciding which objects need to be created for a given use case. Structural Patterns - These design patterns concern class and object composition. Concept of inheritance is used to compose interfaces and define ways to compose objects to obtain new functionalities. -
Zend Framework 3 Cookbook
Table of Contents Introduction 1.1 About the authors 1.2 Configuration zend-config for all your configuration needs 2.1 Manage your application with zend-config-aggregator 2.2 Data Manipulation Convert objects to arrays and back with zend-hydrator 3.1 Scrape Screens with zend-dom 3.2 Paginating data collections with zend-paginator 3.3 Log and Feeds Logging PHP applications 4.1 Discover and Read RSS and Atom Feeds 4.2 Create RSS and Atom Feeds 4.3 Authentication and Authorization Manage permissions with zend-permissions-rbac 5.1 Manage permissions with zend-permissions-acl 5.2 Web Services Implement JSON-RPC with zend-json-server 6.1 Implement an XML-RPC server with zend-xmlrpc 6.2 Implement a SOAP server with zend-soap 6.3 2 Security Context-specific escaping with zend-escaper 7.1 Filter input using zend-filter 7.2 Validate input using zend-validator 7.3 Validate data using zend-inputfilter 7.4 End-to-end encryption with Zend Framework 3 7.5 Deployment and Virtualization Create ZPKs the Easy Way 8.1 Using Laravel Homestead with Zend Framework Projects 8.2 Copyright Copyright note 9.1 3 Introduction Zend Framework 3 Cookbook During the year 2017, Matthew Weier O'Phinney and Enrico Zimuel started a series of blog posts on the offical Zend Framework blog covering its components. Zend Framework is composed by 60+ components covering a wide range of functionality. While the framework has typically been marketed as a full-stack MVC framework, the individual components themselves typically work independently and can be used standalone or within other frameworks. -
Addison Wesley, 2000, Pp
------==Proudly Presented by MODELER==------ preface.fm Page xv Wednesday, June 6, 2001 4:18 PM Preface Design patterns and object-oriented programming. They hold such promise to make your life as a software designer and developer eas- ier. Their terminology is bandied about every day in the technical and even the popular press. But it can be hard to learn them, to become proficient with them, to understand what is really going on. Perhaps you have been using an object-oriented or object-based language for years. Have you learned that the true power of objects is not inheritance but is in “encapsulating behaviors”? Perhaps you are curious about design patterns and have found the literature a bit too esoteric and high-falutin. If so, this book is for you. It is based on years of teaching this material to software developers, both experienced and new to object orientation. It is based upon the belief—and our experience—that once you understand the basic principles and motivations that underlie these concepts, why they are doing what they do, your learning curve will be incredibly shorter. And in our discussion of design patterns, you will under- stand the true mindset of object orientation, which is a necessity before you can become proficient. As you read this book, you will gain a solid understanding of the ten most essential design patterns. You will learn that design pat- terns do not exist on their own, but are supposed to work in con- cert with other design patterns to help you create more robust applications. -
Framework Overview with UML Diagrams
Framework Overview with UML Diagrams Learn to Build Robust, Scalable and Maintainable Applications using PureMVC Framework Overview This document discusses the classes and interfaces of the PureMVC framework; illustrating their roles, responsibilities and collaborations with simple UML (Unified Modeling Language) diagrams. The PureMVC framework has a very narrow goal. That is to help you separate your application’s coding concerns into three discrete tiers; Model, View and Controller. In this implementation of the classic MVC design meta-pattern, the application tiers are represented by three Singletons (a class where only one instance may be created). A fourth Singleton, the Façade, simplifies development by providing a single interface for communications throughout the application. The Model caches named references to Proxies, which expose an API for manipulating the Data Model (including data retrieved from remote services). The View primarily caches named references to Mediators, which adapt and steward the View Components that make up the user interface. The Controller maintains named mappings to Command classes, which are stateless, and only created when needed. The Façade initializes and caches the Core actors (Model, View and Controller), and provides a single place to access all of their public methods. AUTHOR: Cliff Hall <[email protected]> LAST MODIFIED: 3/05/2008 Façade and Core The Façade class makes it possible for the Proxies, Mediators and Commands that make up most of our final application to talk to each other in a loosely coupled way, without having to import or work directly with the Core framework actors. When we create a concrete Façade implementation for our application, we are able to use the Core actors ‘out of the box’, incidental to our interaction with the Façade, minimizing the amount of API knowledge the developer needs to have to be successful with the framework. -
Object-Oriented Analysis, Design and Implementation
Undergraduate Topics in Computer Science Brahma Dathan Sarnath Ramnath Object-Oriented Analysis, Design and Implementation An Integrated Approach Second Edition Undergraduate Topics in Computer Science Undergraduate Topics in Computer Science (UTiCS) delivers high-quality instruc- tional content for undergraduates studying in all areas of computing and information science. From core foundational and theoretical material to final-year topics and applications, UTiCS books take a fresh, concise, and modern approach and are ideal for self-study or for a one- or two-semester course. The texts are all authored by established experts in their fields, reviewed by an international advisory board, and contain numerous examples and problems. Many include fully worked solutions. More information about this series at http://www.springer.com/series/7592 Brahma Dathan • Sarnath Ramnath Object-Oriented Analysis, Design and Implementation An Integrated Approach Second Edition 123 Brahma Dathan Sarnath Ramnath Department of Information and Computer Department of Computer Science Science and Information Technology Metropolitan State University St. Cloud State University St. Paul, MN St. Cloud, MN USA USA Series editor Ian Mackie Advisory Board Samson Abramsky, University of Oxford, Oxford, UK Karin Breitman, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, Brazil Chris Hankin, Imperial College London, London, UK Dexter Kozen, Cornell University, Ithaca, USA Andrew Pitts, University of Cambridge, Cambridge, UK Hanne Riis Nielson, Technical University of Denmark, Kongens Lyngby, Denmark Steven Skiena, Stony Brook University, Stony Brook, USA Iain Stewart, University of Durham, Durham, UK A co-publication with the Universities Press (India) Private Ltd., licensed for sale in all countries outside of India, Pakistan, Bhutan, Bangladesh, Sri Lanka, Nepal, The Maldives, Middle East, Malaysia, Indonesia and Singapore. -
Design Patterns in PHP and Laravel — Kelt Dockins Design Patterns in PHP and Laravel
Design Patterns in PHP and Laravel — Kelt Dockins Design Patterns in PHP and Laravel Kelt Dockins [email protected] Design Patterns in PHP and Laravel Kelt Dockins Dolph, Arkansas USA ISBN-13 (pbk): 978-1-4842-2450-2 ISBN-13 (electronic): 978-1-4842-2451-9 DOI 10.1007/978-1-4842-2451-9 Library of Congress Control Number: 2016961807 Copyright © 2017 by Kelt Dockins This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Trademarked names, logos, and images may appear in this book. Rather than use a trademark symbol with every occurrence of a trademarked name, logo, or image we use the names, logos, and images only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights. While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. -
Enterprise Development with Flex
Enterprise Development with Flex Enterprise Development with Flex Yakov Fain, Victor Rasputnis, and Anatole Tartakovsky Beijing • Cambridge • Farnham • Köln • Sebastopol • Taipei • Tokyo Enterprise Development with Flex by Yakov Fain, Victor Rasputnis, and Anatole Tartakovsky Copyright © 2010 Yakov Fain, Victor Rasputnis, and Anatole Tartakovsky.. All rights reserved. Printed in the United States of America. Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://my.safaribooksonline.com). For more information, contact our corporate/institutional sales department: (800) 998-9938 or [email protected]. Editor: Mary E. Treseler Indexer: Ellen Troutman Development Editor: Linda Laflamme Cover Designer: Karen Montgomery Production Editor: Adam Zaremba Interior Designer: David Futato Copyeditor: Nancy Kotary Illustrator: Robert Romano Proofreader: Sada Preisch Printing History: March 2010: First Edition. Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of O’Reilly Media, Inc. Enterprise Development with Flex, the image of red-crested wood-quails, and related trade dress are trademarks of O’Reilly Media, Inc. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and O’Reilly Media, Inc. was aware of a trademark claim, the designations have been printed in caps or initial caps. While every precaution has been taken in the preparation of this book, the publisher and authors assume no responsibility for errors or omissions, or for damages resulting from the use of the information con- tained herein. -
Design Patterns Design Patterns
Design Patterns CSC207 – Software Design Design Patterns • Design pattern: – A general description of the solution to a well- established problem using an arrangement of classes and objects. • Patterns describe the shape of code rather than the details. – There are lots of them in CSC 301 and 302. Loop patterns from first year • Loop pattern: – A general description of an algorithm for processing items in a collection. • All of you (hopefully) have some loop patterns in your heads. • You don’t really need to think about these any more; you just use them, and you should be able to discuss them with your fellow students. • Some first-year patterns: – Process List – Counted Loop – Accumulator – Sentinel Process list pattern • Purpose: to process every item in a collection where you don’t care about order or context; you don’t need to remember previous items. • Outline: • Example: • Other example: darken every pixel in a picture Counted loop pattern • Purpose: to process a range of indices in a collection. • Outline: • Example: • Other example: print indices of even-length string Accumulator pattern • Purpose: to accumulate information about items in a collection. • Outline: • Example: • Other examples: sum, min, accumulate a list of items meeting a particular criterion. Sentinel pattern • Purpose: to remove a condition in a loop guard. • Outline: • Example: Sentinel pattern, continued • Here is the code that Sentinal replaces; note that i != list.size() is evaluated every time through the loop, even though it is false only once. Design Pattern -
Facet: a Pattern for Dynamic Interfaces
Facet: A pattern for dynamic interfaces Author: Eric Crahen SUNY at Buffalo CSE Department Amherst, NY 14260 201 Bell Hall 716-645-3180 <[email protected]> Context: Wherever it is desirable to create a context sensitive interface in order to modify or control the apparent behavior if an object. Problem: How can I modify the behavior of an existing object so that different behaviors are shown under different circumstances; and yet still maintain a clean separation between the policy (when each behavior is available) and implementation of each behavior allowing them to be developed independently of one another? Forces: Interfaces provide an essential level of abstraction to object oriented programming. Generally, objects are able define aspects of their function very well using interfaces. At times, this may not be enough. When dealing with two or more classes whose responsibilities are distinctly separate, but whose behavior is closely related, classes can begin to resist modularization. For example, adding security to an application means inserting code that performs security checks into numerous locations in existing classes. Clearly, these responsibilities are distinct; the original classes being responsible for the tasks they were designed to perform, and the security classes being responsible for providing access control. However, making those original classes secure means intermingling code that deals with security. When the classes dealing with security are changed many classes are going to be impacted. One method of adding new behavior to an existing class might be to simply create a subclass and embed that new behavior. In the security example, this would mean creating a subclass for each class that needs to be secure and adding calls to the security code.