This document discusses software reuse and application frameworks. It covers the benefits of software reuse like accelerated development and increased dependability. Application frameworks provide a reusable architecture for related applications and are implemented by adding components and instantiating abstract classes. Web application frameworks in particular use the model-view-controller pattern to support dynamic websites as a front-end for web applications.
FRAMEWORKS BETWEEN COMPONENTS AND OBJECTSacijjournal
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Before the emergence of Component-Based Frameworks, similar issues have been addressed by other
software development paradigms including e.g. Object-Oriented Programming (OOP), ComponentBased Development (CBD), and Object-Oriented Framework. In this study, these approaches especially
object-oriented Frameworks are compared to Component-Based Frameworks and their relationship are
discussed. Different software reuse methods impacts on architectural patterns and support for
application extensions and versioning. It is concluded that many of the mechanisms provided by
Component-Based Framework can be enabled by software elements at the lower level. The main
contribution of Component-Based Framework is the focus on Component development. All of them can be
built on each other in layered manner by adopting suitable design patterns. Still some things such as
which method to develop and upgrade existing application to other approach.
Covers security and privacy issues for software product developers including attacks and defenses, encryption, authentication, authorisation and data protection
Discusses the microservices architectural style for cloud-based systems. Explains what is meant by microservices and architectural choices for microservices
Introduces some fundamentals of cloud based software and discusses architectural issues for product developers. Covers containers, databases and cloud architecture choices
Dev Dives: Train smarter, not harder â active learning and UiPath LLMs for do...UiPathCommunity
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đĨ Speed, accuracy, and scaling â discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Miningâĸ:
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This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
đ¨âđĢ Andras Palfi, Senior Product Manager, UiPath
đŠâđĢ Lenka Dulovicova, Product Program Manager, UiPath
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
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91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
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Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But thereâs more:
In a second workflow supporting the same use case, youâll see:
Your campaign sent to target colleagues for approval
If the âApproveâ button is clicked, a Jira/Zendesk ticket is created for the marketing design team
Butâif the âRejectâ button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
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Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
Essentials of Automations: Optimizing FME Workflows with ParametersSafe Software
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Are you looking to streamline your workflows and boost your projectsâ efficiency? Do you find yourself searching for ways to add flexibility and control over your FME workflows? If so, youâre in the right place.
Join us for an insightful dive into the world of FME parameters, a critical element in optimizing workflow efficiency. This webinar marks the beginning of our three-part âEssentials of Automationâ series. This first webinar is designed to equip you with the knowledge and skills to utilize parameters effectively: enhancing the flexibility, maintainability, and user control of your FME projects.
Hereâs what youâll gain:
- Essentials of FME Parameters: Understand the pivotal role of parameters, including Reader/Writer, Transformer, User, and FME Flow categories. Discover how they are the key to unlocking automation and optimization within your workflows.
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- Pro Tips for Success: Gain insights on parameterizing connections and leveraging new features like Conditional Visibility for clarity and simplicity.
Weâll wrap up with a glimpse into future webinars, followed by a Q&A session to address your specific questions surrounding this topic.
Donât miss this opportunity to elevate your FME expertise and drive your projects to new heights of efficiency.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
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Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
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Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as âpredictable inferenceâ.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
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Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
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The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. Whatâs changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
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Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
3. Software reuse
ī˛ In most engineering disciplines, systems are designed
by composing existing components that have been used
in other systems.
ī˛ Software engineering has been more focused on original
development but it is now recognised that to achieve
better software, more quickly and at lower cost, we need
a design process that is based on systematic software
reuse.
ī˛ There has been a major switch to reuse-based
development over the past 10 years.
17/11/2014 Chapter 15 Software reuse 3
4. Reuse-based software engineering
ī˛ System reuse
ī§ Complete systems, which may include several application
programs may be reused.
ī˛ Application reuse
ī§ An application may be reused either by incorporating it without
change into other or by developing application families.
ī˛ Component reuse
ī§ Components of an application from sub-systems to single objects
may be reused.
ī˛ Object and function reuse
ī§ Small-scale software components that implement a single well-
defined object or function may be reused.
17/11/2014 Chapter 15 Software reuse 4
5. Benefits of software reuse
Benefit Explanation
Accelerated development Bringing a system to market as early as possible is
often more important than overall development costs.
Reusing software can speed up system production
because both development and validation time may be
reduced.
Effective use of specialists Instead of doing the same work over and over again,
application specialists can develop reusable software
that encapsulates their knowledge.
Increased dependability Reused software, which has been tried and tested in
working systems, should be more dependable than
new software. Its design and implementation faults
should have been found and fixed.
Chapter 15 Software reuse 517/11/2014
6. Benefits of software reuse
Benefit Explanation
Lower development costs Development costs are proportional to the size of the
software being developed. Reusing software means that
fewer lines of code have to be written.
Reduced process risk The cost of existing software is already known, whereas
the costs of development are always a matter of
judgment. This is an important factor for project
management because it reduces the margin of error in
project cost estimation. This is particularly true when
relatively large software components such as
subsystems are reused.
Standards compliance Some standards, such as user interface standards, can
be implemented as a set of reusable components. For
example, if menus in a user interface are implemented
using reusable components, all applications present the
same menu formats to users. The use of standard user
interfaces improves dependability because users make
fewer mistakes when presented with a familiar interface.Chapter 15 Software reuse 617/11/2014
7. Problems with reuse
Problem Explanation
Creating, maintaining,
and using a component
library
Populating a reusable component library and ensuring the
software developers can use this library can be expensive.
Development processes have to be adapted to ensure that
the library is used.
Finding, understanding,
and adapting reusable
components
Software components have to be discovered in a library,
understood and, sometimes, adapted to work in a new
environment. Engineers must be reasonably confident of
finding a component in the library before they include a
component search as part of their normal development
process.
Increased maintenance
costs
If the source code of a reused software system or
component is not available then maintenance costs may be
higher because the reused elements of the system may
become increasingly incompatible with system changes.
Chapter 15 Software reuse 717/11/2014
8. Problems with reuse
Problem Explanation
Lack of tool support Some software tools do not support development with
reuse. It may be difficult or impossible to integrate these
tools with a component library system. The software
process assumed by these tools may not take reuse into
account. This is particularly true for tools that support
embedded systems engineering, less so for object-
oriented development tools.
Not-invented-here
syndrome
Some software engineers prefer to rewrite components
because they believe they can improve on them. This is
partly to do with trust and partly to do with the fact that
writing original software is seen as more challenging than
reusing other peopleâs software.
Chapter 15 Software reuse 817/11/2014
10. The reuse landscape
ī˛ Although reuse is often simply thought of as the reuse of
system components, there are many different
approaches to reuse that may be used.
ī˛ Reuse is possible at a range of levels from simple
functions to complete application systems.
ī˛ The reuse landscape covers the range of possible reuse
techniques.
17/11/2014 Chapter 15 Software reuse 10
12. Approaches that support software reuse
Approach Description
Application frameworks Collections of abstract and concrete classes are adapted and
extended to create application systems.
Application system
integration
Two or more application systems are integrated to provide
extended functionality
Architectural patterns Standard software architectures that support common types
of application system are used as the basis of applications.
Described in Chapters 6, 11 and 17.
Aspect-oriented software
development
Shared components are woven into an application at different
places when the program is compiled. Described in web
chapter 31.
Component-based
software engineering
Systems are developed by integrating components
(collections of objects) that conform to component-model
standards. Described in Chapter 16.
Chapter 15 Software reuse 1217/11/2014
13. Approaches that support software reuse
Approach Description
Configurable application
systems
Domain-specific systems are designed so that they can be
configured to the needs of specific system customers.
Design patterns Generic abstractions that occur across applications are
represented as design patterns showing abstract and
concrete objects and interactions. Described in Chapter 7.
ERP systems Large-scale systems that encapsulate generic business
functionality and rules are configured for an organization.
Legacy system wrapping Legacy systems (Chapter 9) are âwrappedâ by defining a set
of interfaces and providing access to these legacy systems
through these interfaces.
Model-driven engineering Software is represented as domain models and
implementation independent models and code is generated
from these models. Described in Chapter 5.
Chapter 15 Software reuse 1317/11/2014
14. Approaches that support software reuse
Approach Description
Program generators A generator system embeds knowledge of a type of
application and is used to generate systems in that domain
from a user-supplied system model.
Program libraries Class and function libraries that implement commonly used
abstractions are available for reuse.
Service-oriented systems Systems are developed by linking shared services, which
may be externally provided. Described in Chapter 18.
Software product lines An application type is generalized around a common
architecture so that it can be adapted for different customers.
Systems of systems Two or more distributed systems are integrated to create a
new system. Described in Chapter 20.
Chapter 15 Software reuse 1417/11/2014
15. Reuse planning factors
ī˛ The development schedule for the software.
ī˛ The expected software lifetime.
ī˛ The background, skills and experience of the
development team.
ī˛ The criticality of the software and its non-functional
requirements.
ī˛ The application domain.
ī˛ The execution platform for the software.
17/11/2014 Chapter 15 Software reuse 15
17. Framework definition
ī˛ â..an integrated set of software artefacts (such as
classes, objects and components) that collaborate to
provide a reusable architecture for a family of related
applications.â
Chapter 15 Software reuse 1717/11/2014
18. Application frameworks
ī˛ Frameworks are moderately large entities that can be
reused. They are somewhere between system and
component reuse.
ī˛ Frameworks are a sub-system design made up of a
collection of abstract and concrete classes and the
interfaces between them.
ī˛ The sub-system is implemented by adding components
to fill in parts of the design and by instantiating the
abstract classes in the framework.
17/11/2014 Chapter 15 Software reuse 18
19. Web application frameworks
ī˛ Support the construction of dynamic websites as a front-
end for web applications.
ī˛ WAFs are now available for all of the commonly used
web programming languages e.g. Java, Python, Ruby,
etc.
ī˛ Interaction model is based on the Model-View-Controller
composite pattern.
Chapter 15 Software reuse 1917/11/2014
20. Model-view controller
ī˛ System infrastructure framework for GUI design.
ī˛ Allows for multiple presentations of an object and
separate interactions with these presentations.
ī˛ MVC framework involves the instantiation of a number of
patterns (as discussed in Chapter 7).
17/11/2014 Chapter 15 Software reuse 20
22. WAF features
ī˛ Security
ī§ WAFs may include classes to help implement user authentication (login) and
access.
ī˛ Dynamic web pages
ī§ Classes are provided to help you define web page templates and to populate
these dynamically from the system database.
ī˛ Database support
ī§ The framework may provide classes that provide an abstract interface to different
databases.
ī˛ Session management
ī§ Classes to create and manage sessions (a number of interactions with the
system by a user) are usually part of a WAF.
ī˛ User interaction
ī§ Most web frameworks now provide AJAX support (Holdener, 2008), which allows
more interactive web pages to be created.
Chapter 15 Software reuse 2217/11/2014
23. Extending frameworks
ī˛ Frameworks are generic and are extended to create a more
specific application or sub-system. They provide a skeleton
architecture for the system.
ī˛ Extending the framework involves
ī§ Adding concrete classes that inherit operations from abstract
classes in the framework;
ī§ Adding methods that are called in response to events that are
recognised by the framework.
ī˛ Problem with frameworks is their complexity which means
that it takes a long time to use them effectively.
17/11/2014 Chapter 15 Software reuse 23
25. Framework classes
ī˛ System infrastructure frameworks
ī§ Support the development of system infrastructures such as
communications, user interfaces and compilers.
ī˛ Middleware integration frameworks
ī§ Standards and classes that support component communication
and information exchange.
ī˛ Enterprise application frameworks
ī§ Support the development of specific types of application such as
telecommunications or financial systems.
17/11/2014 Chapter 15 Software reuse 25
27. Software product lines
ī˛ Software product lines or application families are
applications with generic functionality that can be
adapted and configured for use in a specific context.
ī˛ A software product line is a set of applications with a
common architecture and shared components, with each
application specialized to reflect different requirements.
ī˛ Adaptation may involve:
ī§ Component and system configuration;
ī§ Adding new components to the system;
ī§ Selecting from a library of existing components;
ī§ Modifying components to meet new requirements.
17/11/2014 Chapter 15 Software reuse 27
28. Base systems for a software product line
17/11/2014 Chapter 15 Software reuse 28
29. Base applications
ī˛ Core components that provide infrastructure support.
These are not usually modified when developing a new
instance of the product line.
ī˛ Configurable components that may be modified and
configured to specialize them to a new application.
Sometimes, it is possible to reconfigure these
components without changing their code by using a built-
in component configuration language.
ī˛ Specialized, domain-specific components some or all of
which may be replaced when a new instance of a
product line is created.
17/11/2014 Chapter 15 Software reuse 29
30. Application frameworks and product lines
ī˛ Application frameworks rely on object-oriented features
such as polymorphism to implement extensions. Product
lines need not be object-oriented (e.g. embedded
software for a mobile phone)
ī˛ Application frameworks focus on providing technical
rather than domain-specific support. Product lines
embed domain and platform information.
ī˛ Product lines often control applications for equipment.
ī˛ Software product lines are made up of a family of
applications, usually owned by the same organization.
Chapter 15 Software reuse 3017/11/2014
31. Product line architectures
ī˛ Architectures must be structured in such a way to
separate different sub-systems and to allow them to be
modified.
ī˛ The architecture should also separate entities and their
descriptions and the higher levels in the system access
entities through descriptions rather than directly.
17/11/2014 Chapter 15 Software reuse 31
32. The architecture of a resource allocation system
Chapter 15 Software reuse 3217/11/2014
33. The product line architecture of a vehicle
dIspatcher
Chapter 15 Software reuse 3317/11/2014
34. Vehicle dispatching
ī˛ A specialised resource management system where the aim is to
allocate resources (vehicles) to handle incidents.
ī˛ Adaptations include:
ī§ At the UI level, there are components for operator display and
communications;
ī§ At the I/O management level, there are components that handle
authentication, reporting and route planning;
ī§ At the resource management level, there are components for
vehicle location and despatch, managing vehicle status and incident
logging;
ī§ The database includes equipment, vehicle and map databases.
17/11/2014 Chapter 15 Software reuse 34
35. Product line specialisation
ī˛ Platform specialization
ī§ Different versions of the application are developed for
different platforms.
ī˛ Environment specialization
ī§ Different versions of the application are created to handle
different operating environments e.g. different types of
communication equipment.
ī˛ Functional specialization
ī§ Different versions of the application are created for customers
with different requirements.
ī˛ Process specialization
ī§ Different versions of the application are created to support
different business processes.
17/11/2014 Chapter 15 Software reuse 35
37. Product instance development
ī˛ Elicit stakeholder requirements
ī§ Use existing family member as a prototype
ī˛ Choose closest-fit family member
ī§ Find the family member that best meets the requirements
ī˛ Re-negotiate requirements
ī§ Adapt requirements as necessary to capabilities of the
software
ī˛ Adapt existing system
ī§ Develop new modules and make changes for family member
ī˛ Deliver new family member
ī§ Document key features for further member development
17/11/2014 Chapter 15 Software reuse 37
38. Product line configuration
ī˛ Design time configuration
ī§ The organization that is developing the software modifies a
common product line core by developing, selecting or adapting
components to create a new system for a customer.
ī˛ Deployment time configuration
ī§ A generic system is designed for configuration by a customer or
consultants working with the customer. Knowledge of the
customerâs specific requirements and the systemâs operating
environment is embedded in configuration data that are used by
the generic system.
17/11/2014 Chapter 15 Software reuse 38
40. Levels of deployment time configuration
ī˛ Component selection, where you select the modules in a
system that provide the required functionality.
ī˛ Workflow and rule definition, where you define workflows
(how information is processed, stage-by-stage) and
validation rules that should apply to information entered
by users or generated by the system.
ī˛ Parameter definition, where you specify the values of
specific system parameters that reflect the instance of
the application that you are creating
Chapter 15 Software reuse 4017/11/2014
42. Application system reuse
ī˛ An application system product is a software system that
can be adapted for different customers without changing
the source code of the system.
ī˛ Application systems have generic features and so can
be used/reused in different environments.
ī˛ Application system products are adapted by using built-
in configuration mechanisms that allow the functionality
of the system to be tailored to specific customer needs.
ī§ For example, in a hospital patient record system, separate input
forms and output reports might be defined for different types of
patient.
Chapter 15 Software reuse 4217/11/2014
43. Benefits of application system reuse
ī˛ As with other types of reuse, more rapid deployment of a reliable
system may be possible.
ī˛ It is possible to see what functionality is provided by the applications
and so it is easier to judge whether or not they are likely to be
suitable.
ī˛ Some development risks are avoided by using existing software.
However, this approach has its own risks, as I discuss below.
ī˛ Businesses can focus on their core activity without having to devote
a lot of resources to IT systems development.
ī˛ As operating platforms evolve, technology updates may be
simplified as these are the responsibility of the COTS product
vendor rather than the customer.
Chapter 15 Software reuse 4317/11/2014
44. Problems of application system reuse
ī˛ Requirements usually have to be adapted to reflect the
functionality and mode of operation of the COTS product.
ī˛ The COTS product may be based on assumptions that are
practically impossible to change.
ī˛ Choosing the right COTS system for an enterprise can be a
difficult process, especially as many COTS products are not
well documented.
ī˛ There may be a lack of local expertise to support systems
development.
ī˛ The COTS product vendor controls system support and
evolution.
Chapter 15 Software reuse 4417/11/2014
45. Configurable application systems
ī˛ Configurable application systems are generic application
systems that may be designed to support a particular
business type, business activity or, sometimes, a
complete business enterprise.
ī§ For example, an application system may be produced for
dentists that handles appointments, dental records, patient
recall, etc.
ī˛ Domain-specific systems, such as systems to support a
business function (e.g. document management) provide
functionality that is likely to be required by a range of
potential users.
Chapter 15 Software reuse 4517/11/2014
46. COTS-solution and COTS-integrated systems
Configurable application systems Application system integration
Single product that provides the
functionality required by a customer
Several heterogeneous system products
are integrated to provide customized
functionality
Based around a generic solution and
standardized processes
Flexible solutions may be developed for
customer processes
Development focus is on system
configuration
Development focus is on system integration
System vendor is responsible for
maintenance
System owner is responsible for
maintenance
System vendor provides the platform for the
system
System owner provides the platform for the
system
Chapter 15 Software reuse 4617/11/2014
47. ERP systems
ī˛ An Enterprise Resource Planning (ERP) system is a
generic system that supports common business
processes such as ordering and invoicing,
manufacturing, etc.
ī˛ These are very widely used in large companies - they
represent probably the most common form of software
reuse.
ī˛ The generic core is adapted by including modules and
by incorporating knowledge of business processes and
rules.
17/11/2014 Chapter 15 Software reuse 47
49. ERP architecture
ī˛ A number of modules to support different business
functions.
ī˛ A defined set of business processes, associated with
each module, which relate to activities in that module.
ī˛ A common database that maintains information about all
related business functions.
ī˛ A set of business rules that apply to all data in the
database.
Chapter 15 Software reuse 4917/11/2014
50. ERP configuration
ī˛ Selecting the required functionality from the system.
ī˛ Establishing a data model that defines how the organizationâs
data will be structured in the system database.
ī˛ Defining business rules that apply to that data.
ī˛ Defining the expected interactions with external systems.
ī˛ Designing the input forms and the output reports generated by
the system.
ī˛ Designing new business processes that conform to the
underlying process model supported by the system.
ī˛ Setting parameters that define how the system is deployed on
its underlying platform.
Chapter 15 Software reuse 5017/11/2014
51. Integrated application systems
ī˛ Integrated application systems are applications that
include two or more application system products and/or
legacy application systems.
ī˛ You may use this approach when there is no single
application system that meets all of your needs or when
you wish to integrate a new application system with
systems that you already use.
Chapter 15 Software reuse 5117/11/2014
52. Design choices
ī˛ Which individual application systems offer the most
appropriate functionality?
ī§ Typically, there will be several application system products
available, which can be combined in different ways.
ī˛ How will data be exchanged?
ī§ Different products normally use unique data structures and
formats. You have to write adaptors that convert from one
representation to another.
ī˛ What features of a product will actually be used?
ī§ Individual application systems may include more functionality
than you need and functionality may be duplicated across
different products.
Chapter 15 Software reuse 5217/11/2014
54. Service-oriented interfaces
ī˛ Application system integration can be simplified if a
service-oriented approach is used.
ī˛ A service-oriented approach means allowing access to
the application systemâs functionality through a standard
service interface, with a service for each discrete unit of
functionality.
ī˛ Some applications may offer a service interface but,
sometimes, this service interface has to be implemented
by the system integrator. You have to program a wrapper
that hides the application and provides externally visible
services.
Chapter 15 Software reuse 5417/11/2014
56. Application system integration problems
ī˛ Lack of control over functionality and performance
ī§ Application systems may be less effective than they appear
ī˛ Problems with application system inter-operability
ī§ Different application systems may make different assumptions
that means integration is difficult
ī˛ No control over system evolution
ī§ Application system vendors not system users control
evolution
ī˛ Support from system vendors
ī§ Application system vendors may not offer support over the
lifetime of the product
17/11/2014 Chapter 15 Software reuse 56
57. Key points
ī˛ There are many different ways to reuse software. These range from
the reuse of classes and methods in libraries to the reuse of
complete application systems.
ī˛ The advantages of software reuse are lower costs, faster software
development and lower risks. System dependability is increased.
Specialists can be used more effectively by concentrating their
expertise on the design of reusable components.
ī˛ Application frameworks are collections of concrete and abstract
objects that are designed for reuse through specialization and the
addition of new objects. They usually incorporate good design
practice through design patterns.
Chapter 15 Software reuse 5717/11/2014
58. Key points
ī˛ Software product lines are related applications that are developed
from one or more base applications. A generic system is adapted
and specialized to meet specific requirements for functionality, target
platform or operational configuration.
ī˛ Application system reuse is concerned with the reuse of large-scale,
off-the-shelf systems. These provide a lot of functionality and their
reuse can radically reduce costs and development time. Systems
may be developed by configuring a single, generic application
system or by integrating two or more application systems.
ī˛ Potential problems with application system reuse include lack of
control over functionality and performance, lack of control over
system evolution, the need for support from external vendors and
difficulties in ensuring that systems can inter-operate.
Chapter 15 Software reuse 5817/11/2014