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Implementation issues software engineering

This document discusses various implementation issues in software development, including reuse, configuration management, and host-target development. It notes that modern software is often constructed through reuse and that configuration management is needed to track different software versions. Development usually occurs on a host system while execution is on a target system, which can have different architectures and platforms. The document provides details on different levels of reuse, configuration management activities, tools that aid development, and challenges that can arise with reuse and managing development across host-target systems.

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Presented by : Rishi Ram Khanal 108 Bim 6th (TU) 11/27/20201 Implementation issues
Content 11/27/20202  Introduction  Reuse  Configuration management  Host-target development  Reuse levels  Configuration management tool interaction  Development platform tools
Introduction 11/27/20203  Focus here is not on programming, although this is obviously important, but on other implementation issues that are often not covered in programming texts  Reuse Most modern software is constructed by reusing existing components or systems. When you are developing software, you should make as much use as possible of existing code.
11/27/20204  Configuration management During the development process, you have to keep track of the many different versions of each software component in a configuration management system.  Host-target development Production software does not usually execute on the same computer as the software development environment. Rather, you develop it on one computer (the host system) and execute it on a separate computer (the target system).
Reuse 11/27/20205  From the 1960s to the 1990s, most new software was developed from scratch, by writing all code in a high- level programming language. The only significant reuse or software was the reuse of functions and objects in programming language libraries.  Costs and schedule pressure mean that this approach became increasingly unviable, especially for commercial and Internet-based systems.  An approach to development based around the reuse of existing software emerged and is now generally used for business and scientific software.
Reuse levels 11/27/20206  The abstraction level At this level, you don’t reuse software directly but use knowledge of successful abstractions in the design of your software.  The object level At this level, you directly reuse objects from a library rather than writing the code yourself.  The component level Components are collections of objects and object classes that you reuse in application systems.  The system level At this level, you reuse entire application systems.
Software reuse 11/27/20207
Reuse costs 11/27/20208  The costs of the time spent in looking for software to reuse and assessing whether or not it meets your needs.  Where applicable, the costs of buying the reusable software. For large off-the-shelf systems, these costs can be very high.  The costs of adapting and configuring the reusable software components or systems to reflect the requirements of the system that you are developing.  The costs of integrating reusable software elements with each other (if you are using software from different sources) and with the new
Configuration management 11/27/20209  Configuration management is the name given to the general process of managing a changing software system.  The aim of configuration management is to support the system integration process  So that all developers can access the project code  Also documents in a controlled way, find out what changes have been made, and compile and link components to create a system.
Configuration management activities 11/27/202010  Version management = where support is provided to keep track of the different versions of software components.  System integration = where support is provided to help developers define what versions of components are used to create each version of a system.  Problem tracking = where support is provided to allow users to report bugs and other problems, and to allow all developers to see who is working on these problems and when they are fixed.
Configuration management tool interaction 11/27/202011
Host-target development 11/27/202012  Most software is developed on one computer (the host), but runs on a separate machine (the target).  More generally, we can talk about a development platform and an execution platform.  A platform is more than just hardware.  It includes the installed operating system plus other supporting software such as a database management system.  Development platform usually has different installed software than execution platform , these platforms may have different architectures.
Host-target development 11/27/202013
Development platform tools 11/27/202014  An integrated compiler and syntax-directed editing system that allows you to create, edit and compile code.  A language debugging system.  Graphical editing tools, such as tools to edit UML models.  Testing tools, such as Junit that can automatically run a set of tests on a new version of a program.  Project support tools that help you organize the code for different development projects.
Reference 11/27/202015  https://www.safaribooksonline.com/library/view/so ftware-engineering  https://search.yahoo.com/yhs/search;_ylt  https://www.slideshare.net
11/27/202016  Thank you  Any question