PD99-????-????

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PD99-????-????
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CBSE New Paradigm for the New Millennium
? ?
1999. . .
1999. 10 . 29 .
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???-??????????
??????(??, ?)
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1. Introduction to CBSE
2. Application of CBSE to an Organization
3. Technologies Related to CBSE
4. Conclusions
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Introduction to CBSE
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Definition of CBSE/CBD/Componentware

• ??????? ???(?) ???
• ??? ??? ???? ?? ????? ??, ???? ? ??? ?????? ???
  ?? ??? ???? ?????? ???? ?? ???? ?????? ??
• ???? ?? ??? ?? ETRI
• ??? ???? ??? ????? ??? ??? ? ??????? ???? ???
  ?????? ???? ? ???, ??? ??? ?? ??? ????? ??? ??
• ? ???? ???? ?????, ?????, ????????, ?????, ????
  ? ????? ???? ????? ???? ??

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(No Transcript)
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Definition of CBSE

• '99 ICSE CBSE Workshop
• Executable
• 3rd-party composable
• Has explicit interfaces
• Conforms to a component model
• Clemens Szyperski (Component Software)
• A software component is a unit of composition
  with contractually specified interfaces and
  explicit context dependencies only. A software
  component can be deployed independently and is
  subject to to third-party composition.
• Philippe Krutchen (Rational Software)
• A Component is a nontrivial, nearly independent,
  and replaceable part of a system that fulfills a
  clear function in the context of a well-defined
  architecture. A component conforms to and
  provides the physical realization of a set of
  interfaces.

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Components vs Objects
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Benefits of CBSE

• Faster production
• ????? ??? ???? ??? ??
• Better product
• ?????? ?? ?? ???? ?? ???? ????
• Cheaper cost
• ??? ??? ?? ???? long term? ?? ?? ?? ??gt
  software component? ?? asset?? ??

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Application of CBSE to an Organization
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CBSE Processes and Methodologies
Comparison of Conventional and CBSE Development
Models
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CBSE Processes and Methodologies
CBSE Methodology

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CBSE Processes and Methodologies

• ?? CBD ???
• CBD 96
• Sterling Software? ???? COOLGen? ???? ?????
  ????? ????? ???? ?? ??
• ????? ??, ??, ????? ???? ?? ???? ?? ???? ?? ????
  ?? ?? Guideline?? ??
• ?? ????? ?? ?? ????, ???? ??? ???? ?? ??
• ???? ?????? ?? ??, ???? ?? ??? ??
• ???? ?? ??? ??, ???? ??
• ???? ?????? ?? ??, ??? ??(Naming Convention
  Standards) ?? ??

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CBSE Processes and Methodologies

• ?? CBD ??
• Catalysis method Component Framework ??? ?????
  ??, UML OMG compliant.
• IBM SanFrancisco R1.4 WebSphere(connecting
  server applications to the Web), CBO ported as
  EJBs Legacy Wrapper
• Sterling Cool Spex Providing CBD96(CoolGen ???
  ?? )
• SELECT Software Tools SCF(SELECT Component
  Factory)
• SELECT Component Manager Wrapping, Cataloguing
  Searching
• SELECT Enterprise Modeling generating new
  components
• SCF supports industry standards Microsoft
  Solution Framework, DCOM, EJB CORBA
• SCF utilizes a model-driven approach centred on
  the UML
• Others HOW(Riverton Software Corp),
  Uniface(Compuware Corp)
• Fusion(Netron Inc.), Dynasty(Dynasty
  Technologies Inc.)

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Component Business Model
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Technologies Related to CBSE
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Domain Analysis Modeling

• ?? ?? ???
• FODA(Feature-Oriented Domain Analysis, Kang,
  1990), FORM(Kang)
• DSSA(Domain-Specific Software Architecture, Tracz
  et al., 1993)
• ODM(Organization Domain Modeling, Simos, 1995)

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Domain Engineering Output
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Software Architecture

• Definition The software architecture of a
  program or computing system is the structure of
  the system, which comprises software components,
  the externally visible properties of those
  components, and the relationships among them.
• Three critical roles of an architecture
• A Blueprint of future systems an objective
  representation of knowledge about the design and
  plan of systems
• A Picture of existing systems an objective
  representation of knowledge that facilitates the
  understanding of systems
• A Roadmap about how to get there
• An objective representation of knowledge that
  provides guidance and supporting elements of
  practice
• The captured knowledge is not about detailed
  information of any application systems
• Provides an environment framework to guide new
  systems development according to certain defined
  standards and rules

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The Importance of Architecture

• To a project
• vehicle for stakeholder communication
• key to achieving system qualities
• basis for development project structure
• To an organization
• can be reused from project to project
• forms a basis for product lines
• is a foundation for new market entry
• To a community
• standard models emerge for mature domains
• is a basis for component markets

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Stakeholders of a System
Marketing stakeholder
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Layered Architecture Model for the Specific
Domain of a Specific Organization

• Variants of a particular application system
  (e.g., Digicash Cashier)

• Distinct application systems(e.g., ATM
  Cashier, Payment, Invoicing)

Application Systems

• Application domain and organization
  specific(e.g., Account Mgnt, Bank Customer Mgnt)

Business Specific
Middleware

• Platform-independent distributed object
  computing(Java, HP ORB )

System Software

• Platform-specific(NT, TCP/IP)

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Example of Software Architecture
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Architecture Description Language

• ADL(Architecture Description Language)? ??
• CMU? ACME AESOP, ObjectTime? ObjectTime, etc.
• ADL? ??
• Architecture Description(structural behavioral)
  ? ?? 7 type ?? components, connectors, systems,
  ports, roles, representations, rep-maps.
• Syntax Checker
• Design Guideline Caption to describe an
  architectural design of a specific domain along
  with components, connectors, etc.
• Architecture-focused DoD Software Technology
  programs
• STARS, CARDS, PRISM, DISA, SEI, DSSA, etc.

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Component Modeling

• ???? ?? ?? ADL? Design rule? ?? ?? ?? ??? ??
  checking? ???? formal? ??? ??
• ???? ?? ?? ADL ? UML
• Domain specific ADL? ??? component? design? UML?
  ??
• UML? extension
• ADL UML ?? gt Domain Specific Modeling
  Language? ??
• Component Description Model Chilvers Python
• Extension of CORBA IDL to add 3 keywords(Provide,
  Require, Management)
• Classification of component interfaces including
  QoS Spec(nonfunc Prop)
• Provide describes a set of interfaces that an
  object can provide to its environment. Given as a
  set of CORBA interface references.
• Require a set of interfaces describing the
  dependencies of this object to its environment.
  Reference CORBA interfaces.
• Management Require Provide Interfaces? ???
  Behavior? view, add, remove, change?? ??? ??

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Component Description Model
Provide Interface
Component
CORBA Object
Require Interface
Management Interface
Component
Component
CORBA Object
CORBA Object
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???? ?? ??

• Component Architectures ?? ?? COM/DCOM,
  OCX/ActiveX, JavaBeans/EJB, CORBA
• Component Execution Platforms ???? IBM Component
  Broker, MS Windows DNA, Oracle NCA, Sybase
  CTS/ACA
• ?? platform?? ?? ??
• wrapper/mapper ?? e.g., COM/DCOM? JavaBeans ??,
  JavaBeans? CORBA?? ??
• ???? ????? ??
• IDL describes interfaces provided by and used by
  an object.
• ???? ????? ??? ??? CORBA/EJB/MS interface
  specification? ?? ?? ?? ???? ????? ??? ???
• IDL? ? Orbix 2.2 IDL compiler
• ?? ??? ?? ?? ?? ? Domain specific IDL ??

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???? ??(Assembly/Composition)

• ADL? ????? inter-operate?? ?? ??? ?? reference
  model?? component composition? ?? language
• ADL Ease the plug-and-play of heterogeneous
  components to build S/W
• An application is represented as a set of
  components that have fulfilled the required
  connections between Provide and Require
  Interfaces
• Composition?? composition? consistency(compatibil
  ity)? check?? ?? Management interface? ??

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Component Adaptation

• Adaptation(Dynamic Re-configuration)
• Watching some events of interest generated
  internally or from the environment and taking
  appropriate action to adjust to these new
  conditions.
• The Management Interface(MI) is in charge of all
  static dynamic configuration of a component
  adaptation rules must be defined according to
  Event/Condition/Action tuples.
• Types of Component Adaptation
• Component adaptation(black box component)
  modifications as planned by component developers
  (e.g., parameterization) and/or as supported by
  component technology (e.g., inheritance)
• Component modification(white box component)
  modifications not planned by component developers
  or supported by component technology

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???? ?? ??

• ?? ?? ?? How to extract reusable components
  from existing systems
• Domain Analysis by domain experts
• PSDG(Post-State Dependency Graph, Pizz, Petius
  software) ????? ???? ? ????? ??? ?? ?????? ??
  ??? ?? ? ?????? ???? ??? ????? ??. ??? ??? ?????
  ?? ???? ???? ???? ???? ? ???(Clustering)? ???
• Facade a packaged subset of components,
  references to components
• Component Wrapping ??
• Software architecture, Facade? ???? extracted
  object sources? Clustering
• Clustered Components? Interface? ????
  componentization
• Legacy Wrapping ??
• Legacy applications? Data? access?? ?? Wrapping
  tool(server-side component wrapper)? ??
• Design recovery, Software architecture(ADL) ?? ??

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???? ??

• ???? ??? ???? ??
• Operate a rating system by users
• Produce an evaluation demo version
• ???? ??, ??, ??, ??? ?? ?? ??? Portal Site ???
  ???
• ???? ?? ??? ???, Usage-Based Billing System
• Commercial Component Sites
• ltJavaBeansgt
• EarthWeb, Inc. (http//www.gamelan) Called
  Gamelan, the official directory for Java, Java
  Focused
• EarthWeb, Inc.(http//www.jars.com) Called
  Gamelan, Rating Scheme of Components
• Webresource.net(http//www.webresource.net)
• Flashline(http//www.flashline.com) Beta Beans
  Available, Component Development
  Brokerage(Bidding) system
• ltActiveX/OCXgt
• ActiveX.com(http//www.activex.com) ActiveX
  Based
• ObjectTiger(http//www.objecttiger.com)
• ltVarious Components from Various
  Architecturesgt
• Componentsource(http//www.componentsource.co.uk)
  Business Component Request Center

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Conclusions?????
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Characteristics of the Best Components

• Security, Licensing, Versioning, Life-cycle
  management
• Event Notification, Configuration and property
  management
• Scripting, Metadata and introspection, Concurrent
  control and locking
• Relationships, Ease of use, Self-testing,
  Self-installing

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