API360: the Complete API Strategy Model for the Enterprise
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A Microkernel API for Fine-Grained Decomposition
A Microkernel API for Fine-Grained Decomposition Sebastian Reichelt Jan Stoess Frank Bellosa System Architecture Group, University of Karlsruhe, Germany freichelt,stoess,[email protected] ABSTRACT from the microkernel APIs in existence. The need, for in- Microkernel-based operating systems typically require spe- stance, to explicitly pass messages between servers, or the cial attention to issues that otherwise arise only in dis- need to set up threads and address spaces in every server for tributed systems. The resulting extra code degrades per- parallelism or protection require OS developers to adopt the formance and increases development effort, severely limiting mindset of a distributed-system programmer rather than to decomposition granularity. take advantage of their knowledge on traditional OS design. We present a new microkernel design that enables OS devel- Distributed-system paradigms, though well-understood and opers to decompose systems into very fine-grained servers. suited for physically (and, thus, coarsely) partitioned sys- We avoid the typical obstacles by defining servers as light- tems, present obstacles to the fine-grained decomposition weight, passive objects. We replace complex IPC mecha- required to exploit the benefits of microkernels: First, a nisms by a simple function-call approach, and our passive, lot of development effort must be spent into matching the module-like server model obviates the need to create threads OS structure to the architecture of the selected microkernel, in every server. Server code is compiled into small self- which also hinders porting existing code from monolithic sys- contained files, which can be loaded into the same address tems. Second, the more servers exist | a desired property space (for speed) or different address spaces (for safety). -
Openvms Record Management Services Reference Manual
OpenVMS Record Management Services Reference Manual Order Number: AA-PV6RD-TK April 2001 This reference manual contains general information intended for use in any OpenVMS programming language, as well as specific information on writing programs that use OpenVMS Record Management Services (OpenVMS RMS). Revision/Update Information: This manual supersedes the OpenVMS Record Management Services Reference Manual, OpenVMS Alpha Version 7.2 and OpenVMS VAX Version 7.2 Software Version: OpenVMS Alpha Version 7.3 OpenVMS VAX Version 7.3 Compaq Computer Corporation Houston, Texas © 2001 Compaq Computer Corporation Compaq, AlphaServer, VAX, VMS, the Compaq logo Registered in U.S. Patent and Trademark Office. Alpha, PATHWORKS, DECnet, DEC, and OpenVMS are trademarks of Compaq Information Technologies Group, L.P. in the United States and other countries. UNIX and X/Open are trademarks of The Open Group in the United States and other countries. All other product names mentioned herein may be the trademarks of their respective companies. Confidential computer software. Valid license from Compaq required for possession, use, or copying. Consistent with FAR 12.211 and 12.212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U.S. Government under vendor’s standard commercial license. Compaq shall not be liable for technical or editorial errors or omissions contained herein. The information in this document is provided "as is" without warranty of any kind and is subject to change without notice. The warranties for Compaq products are set forth in the express limited warranty statements accompanying such products. Nothing herein should be construed as constituting an additional warranty. -
Software Quality Management
Software Quality Management 2004-2005 Marco Scotto ([email protected]) Software Quality Management Contents ¾Definitions ¾Quality of the software product ¾Special features of software ¾ Early software quality models •Boehm model • McCall model ¾ Standard ISO 9126 Software Quality Management 2 Definitions ¾ Software: intellectual product consisting of information stored on a storage device (ISO/DIS 9000: 2000) • Software may occur as concepts, transactions, procedures. One example of software is a computer program • Software is "intellectual creation comprising the programs, procedures, rules and any associated documentation pertaining to the operation of a data processing system" •A software product is the "complete set of computer programs, procedures and associated documentation and data designated for delivery to a user" [ISO 9000-3] • Software is independent of the medium on which it is recorded Software Quality Management 3 Quality of the software product ¾The product should, on the highest level… • Ensure the satisfaction of the user needs • Ensure its proper use ¾ Earlier: 1 developer, 1 user • The program should run and produce results similar to those expected ¾ Later: more developers, more users • Need to economical use of the storage devices • Understandability, portability • User-friendliness, learnability ¾ Nowadays: • Efficiency, reliability, no errors, able to restart without using data Software Quality Management 4 Special features of software (1/6) ¾ Why is software ”different”? • Does not really have “physical” existence -
Introduction to Unix
Introduction to Unix Rob Funk <[email protected]> University Technology Services Workstation Support http://wks.uts.ohio-state.edu/ University Technology Services Course Objectives • basic background in Unix structure • knowledge of getting started • directory navigation and control • file maintenance and display commands • shells • Unix features • text processing University Technology Services Course Objectives Useful commands • working with files • system resources • printing • vi editor University Technology Services In the Introduction to UNIX document 3 • shell programming • Unix command summary tables • short Unix bibliography (also see web site) We will not, however, be covering these topics in the lecture. Numbers on slides indicate page number in book. University Technology Services History of Unix 7–8 1960s multics project (MIT, GE, AT&T) 1970s AT&T Bell Labs 1970s/80s UC Berkeley 1980s DOS imitated many Unix ideas Commercial Unix fragmentation GNU Project 1990s Linux now Unix is widespread and available from many sources, both free and commercial University Technology Services Unix Systems 7–8 SunOS/Solaris Sun Microsystems Digital Unix (Tru64) Digital/Compaq HP-UX Hewlett Packard Irix SGI UNICOS Cray NetBSD, FreeBSD UC Berkeley / the Net Linux Linus Torvalds / the Net University Technology Services Unix Philosophy • Multiuser / Multitasking • Toolbox approach • Flexibility / Freedom • Conciseness • Everything is a file • File system has places, processes have life • Designed by programmers for programmers University Technology Services -
Quality-Based Software Reuse
Quality-Based Software Reuse Julio Cesar Sampaio do Prado Leite1, Yijun Yu2, Lin Liu3, Eric S. K. Yu2, John Mylopoulos2 1Departmento de Informatica, Pontif´ıcia Universidade Catolica´ do Rio de Janeiro, RJ 22453-900, Brasil 2Department of Computer Science, University of Toronto, M5S 3E4 Canada 3School of Software, Tsinghua University, Beijing, 100084, China Abstract. Work in software reuse focuses on reusing artifacts. In this context, finding a reusable artifact is driven by a desired functionality. This paper proposes a change to this common view. We argue that it is possible and necessary to also look at reuse from a non-functional (quality) perspective. Combining ideas from reuse, from goal-oriented requirements, from aspect-oriented programming and quality management, we obtain a goal-driven process to enable the quality-based reusability. 1 Introduction Software reuse has been a lofty goal for Software Engineering (SE) research and prac- tice, as a means to reduced development costs1 and improved quality. The past decade has seen considerable progress in fulfilling this goal, both with respect to research ideas and industrial practices (e.g., [1–3]). Current reuse techniques focus on the reuse of software artifacts on the basis of de- sired functionality. However, non-functional properties (qualities) of a software system are also crucial. Systems fail because of inadequate performance, security, reliability, usability, or precision, to name a few. Quality concerns, therefore, should also be front and centre in methods for software reuse. For example, in designing for the NASA Mars Spirit spacecraft, one would not adopt a “cosine” function from an arbitrary mathemat- ical library. -
Design Rules
Design rules Chapter 7 adapted by Dr. Kristina Lapin, Vilnius University design rules Designing for maximum usability – the goal of interaction design • Principles of usability – general understanding • Standards and guidelines – direction for design • Design patterns – capture and reuse design knowledge types of design rules • principles – abstract design rules – low authority – high generality Guideline s • standards – specific design rules – high authority – limited application increasinggenerality Standards • guidelines generality increasing – lower authority increasing authority increasing authority – more general application Principles to support usability Learnability the ease with which new users can begin effective interaction and achieve maximal performance Flexibility the multiplicity of ways the user and system exchange information Robustness the level of support provided the user in determining successful achievement and assessment of goal- directed behaviour •Predictability •Synthezability Learnability •Familiarity •Generalizability •Consistency Principles of learnability Predictability – determining effect of future actions based on past interaction history – operation visibility Predictability http://www.webbyawards.com/ 7 Principles of learnability Synthesizability – assessing the effect of past actions – immediate vs. eventual honesty Synthesizability 1. 2. 3. 9 Principles of learnability (ctd) Familiarity – how prior knowledge applies to new system – guessability; affordance Principles of learnability (ctd) Generalizability -
Usability Basics for Software Developers Usability Engineering
focususability engineering Usability Basics for Software Developers Xavier Ferré and Natalia Juristo, Universidad Politécnica de Madrid Helmut Windl, Siemens AG, Germany Larry Constantine, Constantine & Lockwood n recent years, software system usability has made some interesting ad- vances, with more and more organizations starting to take usability seri- ously.1 Unfortunately, the average developer has not adopted these new I concepts, so the usability level of software products has not improved. Contrary to what some might think, us- Usability engineering defines the target us- This tutorial ability is not just the appearance of the user ability level in advance and ensures that the examines the interface (UI). Usability relates to how the software developed reaches that level. The system interacts with the user, and it includes term was coined to reflect the engineering ap- relationship five basic attributes: learnability, efficiency, proach some usability specialists take.3 It is between usability user retention over time, error rate, and sat- “a process through which usability character- and the user isfaction. Here, we present the general us- istics are specified, quantitatively and early in interface and ability process for building a system with the the development process, and measured desired level of usability. This process, which throughout the process.”4 Usability is an is- discusses how most usability practitioners apply with slight sue we can approach from multiple view- the usability variation, is structured around a design- points, which is why many different disci- process follows a evaluate-redesign cycle. Practitioners initiate plines, such as psychology, computer science, design-evaluate- the process by analyzing the targeted users and sociology, are trying to tackle it. -
HP Openvms Utility Routines Manual
HP OpenVMS Utility Routines Manual Order Number: BA554-90019 June 2010 This manual describes the OpenVMS utility routines, a set of routines that provide a programming interface to various OpenVMS utilities. Revision/Update Information: This manual supersedes the HP OpenVMS Utility Routines Manual, OpenVMS Alpha Version 8.3. Software Version: OpenVMS Version 8.4 for Integrity servers OpenVMS Alpha Version 8.4 Hewlett-Packard Company Palo Alto, California © Copyright 2010 Hewlett-Packard Development Company, L.P. Confidential computer software. Valid license from HP required for possession, use or copying. Consistent with FAR 12.211 and 12.212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U.S. Government under vendor’s standard commercial license. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein. Intel and Itanium are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries. ZK4493 The HP OpenVMS documentation set is available on CD. This document was prepared using DECdocument, Version 3.3-1B. Contents Preface ............................................................ xvii 1 Introduction to Utility Routines 2 Access Control List (ACL) Editor Routine 2.1 Introduction to the ACL Editor Routine ........................... ACL–1 2.2 Using the ACL Editor Routine: An Example ....................... ACL–1 2.3 ACL Editor Routine . ........................................ ACL–2 ACLEDIT$EDIT ........................................... -
USABILITY of PROCESSES in ENGINEERING DESIGN Becerril, Lucia; Stahlmann, Jan-Timo; Beck, Jesco; Lindemann, Udo Technical University of Munich, Germany
21ST INTERNATIONAL CONFERENCE ON ENGINEERING DESIGN, ICED17 21-25 AUGUST 2017, THE UNIVERSITY OF BRITISH COLUMBIA, VANCOUVER, CANADA USABILITY OF PROCESSES IN ENGINEERING DESIGN Becerril, Lucia; Stahlmann, Jan-Timo; Beck, Jesco; Lindemann, Udo Technical University of Munich, Germany Abstract Processes in Engineering Design are generally optimized towards efficiency, quality, costs, risks, etc., however an analysis that includes requirements from the process users' view is missing. Within the last years, the concept of usability has being introduced to examine business processes. This is a promising approach for Engineering Design, by involving process "users" (designers, engineers, software developers, project managers, etc.) in the process planning phase, several issues such as consistency flaws or counter-intuitive information flow can be identified beforehand. This paper aims to explore the transferability of usability concepts and evaluation methods to processes in the field of Engineering Design. The goal of this paper is to set a basis for further studies with regard on how to plan and design processes that interact efficiently, effectively and satisfactorily with the people involved. For this purpose ten process usability attributes are consolidated from the overlap between usability attributes (of products and systems) and process system properties. Moreover, five usability evaluation methods are examined on their applicability for evaluating design processes. Keywords: Design management, Design process, User centred design Contact: Lucia Becerril Technical University of Munich Chair of Product Development Germany [email protected] Please cite this paper as: Surnames, Initials: Title of paper. In: Proceedings of the 21st International Conference on Engineering Design (ICED17), Vol. 2: Design Processes | Design Organisation and Management, Vancouver, Canada, 21.-25.08.2017. -
Quality Attributes and Design Tactics
Quality Attribute Scenarios and Tactics Chapters 5-11 in Text Some material in these slides is adapted from Software Architecture in Practice, 3rd edition by Bass, Clements and Kazman. J. Scott Hawker/R. Kuehl p. 1 R I T Software Engineering Quality Attributes – Master List • Operational categories • Developmental categories – Availability – Modifiability – Interoperability – Variability – Reliability – Supportability – Usability – Testability – Performance – Maintainability – Deployability – Portability – Scalability – Localizability – Monitorability – Development distributability – Mobility – Buildability – Compatibility – Security – Safety J. Scott Hawker/R. Kuehl p. 2 R I T Software Engineering Achieving Quality Attributes – Design Tactics A system design is a collection of design decisions Some respond to quality attributes, some to achieving functionality A tactic is a design decision to achieve a QA response Tactics are a building block of architecture patterns – more primitive/granular, proven design technique Tactics to Control Stimulus Response Response J. Scott Hawker/R. Kuehl p. 3 R I T Software Engineering Categories of Design Decisions Allocation of responsibilities – system functions to modules Coordination model – module interaction Data model – operations, properties, organization Resource management – use of shared resources Architecture element mapping – logical to physical entities; i.e., threads, processes, processors Binding time decisions – variation of life cycle point of module “connection” Technology choices J. Scott Hawker/R. Kuehl p. 4 R I T Software Engineering Design Checklists Design considerations for each QA organized by design decision category For example, allocation of system responsibilities for performance: What responsibilities will involve heavy loading or time critical response? What are the processing requirements, will there be bottlenecks? How will threads of control be handled across process and processor boundaries? What are the responsibilities for managing shared resources? J. -
Application of User-Centered Design for a Student Case Management System
IT 11 057 Examensarbete 15 hp August 2011 Application of User-Centered Design for a Student Case Management System Vincent Kahl Institutionen för informationsteknologi Department of Information Technology ! Abstract Application of User-Centered Design for a Student Case Management System Vincent Kahl Teknisk- naturvetenskaplig fakultet UTH-enheten The student office and student counselors of Uppsala University’s IT Department need a new application for organizing and coordinating Besöksadress: student cases. The aim of this thesis is to define a specification for a Ångströmlaboratoriet Lägerhyddsvägen 1 new system. A user-centered design (UCD) approach is taken to Hus 4, Plan 0 ensure that the new application will increase productivity, is usable, and is accepted by the people that will work with it. The employed Postadress: UCD process is a custom adaption of the ISO 9241-210 standard’s Box 536 751 21 Uppsala UCD process proposal. Following the activity cycle of the ISO standard for user-centered design, this specification will understand and Telefon: specify the context of use, specify the user and organizational 018 – 471 30 03 requirements, and produce design solutions that are evaluated against Telefax: the requirements. 018 – 471 30 00 Hemsida: http://www.teknat.uu.se/student Handledare: Lars Oestreicher Ämnesgranskare: Lars Oestreicher Examinator: Anders Jansson IT 11 057 Tryckt av: Reprocentralen ITC ! Table of Contents 1! Introduction ........................................................................................................ -
The 6 Key Benefits of Being an Api-Centric Organization
THE 6 KEY BENEFITS OF BEING AN API-CENTRIC ORGANIZATION © 2019 Radical I/O Technology Inc. FOREWORD Digital transformation is about more than adopting the latest technologies. It is about maximizing value by using technology to improve efficiency and productivity, drive engagement and growth, and ultimately make the lives of customers, partners and staff better. APIs play an integral role as the connectors between the systems, data, and people that enable digital transformation initiatives. This guide, the first in our series exploring API best practices, therefore focuses on what APIs are, how they work, and outlines six benefits they offer for achieving organizational goals. Radical I/O is a people-first technology consultancy and lab in Vancouver, BC that specializes in data-driven enterprise software development with highly performant API architecture at its core. We understand that the needs of private and public organizations are continually evolving, and we enjoy working collaboratively with our clients and partners to create forward-thinking technology solutions. IAN SIM Chief Technology Officer Radical I/O Technology [email protected] © 2019 Radical I/O Technology Inc. THE 6 KEY BENEFITS OF BEING AN API-CENTRIC ORGANIZATION 3 CONTENTS There’s an API for that ..........................................................................1 What is an API? ..................................................................................... 2 Types of APIs ...........................................................................................4