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Software Architecture Document
C - Registration System
Table of Contents
1. Introduction
1.1 Purpose
1.2 Scope
1.3 Definitions, Acronyms and Abbreviations
1.4 References
2. Architectural Representation
3. Architectural Goals and Constraints
4. Use-Case View
4.1 Architecturally-Significant Use Cases
5. Logical View
5.1 Architecture Overview – Package and Subsystem Layering
6. Process View
6.1 Processes
6.2 Process to Design Elements
6.3 Process Model to Design Model Dependencies
6.4 Processes to the Implementation
7. Deployment View
7.1 External Desktop PC
7.2 Desktop PC
7.3 Registration Server
7.4 Course Catalog
7.5 Billing System
8. Size and Performance
9. Quality
Software Architecture Document
1. Introduction
1.1 Purpose
This document provides a comprehensive architectural overview of the system,using a number of
different architectural views to depict different aspects ofthe system.It is intended to capture and
convey the significant architectural decisions which have been made on the system.
1.2 Scope
This Software Architecture Document provides an architectural overview of the C-Registration System.
The C-Registration System is being developed by Wylie College to support online course registration.
This Document has been generated directly from the C-Registration Analysis & Design Model
implemented in Rose. The majority of the sections have been extracted from the Rose Model using
SoDA and the Software Architecture Document template.
1.3 Definitions, Acronyms and Abbreviations
See the Glossary [4].
1.4 References
Applicable references are:
1. Course Billing Interface Specification, WC93332, 1985, Wylie College Press.
2. Course Catalog Database Specification, WC93422, 1985, Wylie College Press.
3. Vision Document of the C-Registration System, WyIT387, V1.0, 1998, Wylie College IT.
4. Glossary for the C-Registration System, WyIT406, V2.0, 1999, Wylie College IT.
5. Use Case Spec - Close Registration, WyIT403, V2.0, 1999, Wylie College IT.
6. Use Case Spec – Login, WyIT401, V2.0, 1999, Wylie College IT.
7. Use Case Spec - Maintain Professor Info, WyIT407, Version 2.0, 1999, Wylie College IT.
8. Use Case Spec - Register for Courses, WyIT402, Version 2.0, 1999, Wylie College IT.
9. Use Case Spec - Select Courses to Teach, WyIT405, Version 2.0, 1999, Wylie College IT.
10. Use Case Spec - Maintain Student Info, WyIT408, Version 2.0, 1999, Wylie College IT.
11. Use Case Spec - Submit Grades, WyIT409, Version 2.0, 1999, Wylie College IT.
12. Use Case Spec - View Report Card, WyIT410, Version 2.0, 1999, Wylie College IT.
13. Software Development Plan for the C-Registration System, WyIT418, V1.0, 1999, Wylie
College IT.
14. E1 Iteration Plan, WyIT420, V1.0, 1999, Wylie College IT.
15. Supplementary Specification, WyIT400, V1.0, 1999, Wylie College, IT.
2. Architectural Representation
This document presents the architecture as a series of views; use case view, logical view, process view
and deployment view. There is no separate implementation view described in this document. These are
views on an underlying Unified Modeling Language (UML) model developed using Rational Rose.
3. Architectural Goals and Constraints
There are some key requirements and systemconstraints that have a significant bearing on the architecture.
They are:
1. The existing legacy Course Catalog Systemat Wylie College must be accessed to retrieve all
course information for the current semester. The C-Registration System must support the data
formats and DBMS of the legacy Course Catalog System [2].
2. The existing legacy Billing System at Wylie College must be interfaced with to support billing of
students.This interface is defined in the Course Billing Interface Specification [1].
3. All student,professor,and Registrar functionality must be available from both local campus PCs
and remote PCs with internet dial up connections.
4. The C-Registration System must ensure complete protection of data from unauthorized access.All
remote accesses are subject to user identification and password control.
5. The C-Registration System will be implemented as a client-server system. The client portion
resides on PCs and the server portion must operate on the Wylie College UNIX Server. [3]
6. All performance and loading requirements, as stipulated in the Vision Document [3] and the
Supplementary Specification [15], must be taken into consideration as the architecture is being
developed.
4. Use-Case View
A description of the use-case view of the software architecture. The Use Case View is important input to the
selection of the set of scenarios and/or use cases that are the focus of an iteration. It describes the set of
scenarios and/oruse cases that represent some significant, central functionality. It also describes the set of
scenarios and/oruse cases that have a substantialarchitectural coverage (that exercise many architectural
elements) or that stress orillustrate a specific, delicate point of the architecture.
The C-Registration use cases are:
- Login
- Register for Courses
- Maintain Student Information
- Maintain Professor Information
- Select Courses to Teach
- Submit Grades
- View Report Card
- Close Registration.
These use cases are initiated by the student,professor,or the registrar actors. In addition, interaction with
external actors; Course Catalog and Billing System occur.
4.1 Architecturally-Significant Use Cases
Diagram Name: Architecturally Significant Use-Cases
4.1.1 Close Registration
Brief Description:This use case allows a Registrar to close the registration process.Course
offerings that do not have enough students are cancelled. Course offerings must have a
minimum of three students in them. The billing systemis notified for each student in each
course offering that is not cancelled, so the student can be billed for the course offering. The
main actor of this use case is the Registrar. The Billing System is an actor involved within this
use case.
4.1.2 Login
Brief Description:This use case describes how a userlogs into the Course Registration System.
The actors starting this use case are Student, Professor, and Registrar.
4.1.3 Maintain Professor Information
Brief Description:This use case allows the registrar to maintain professorinformation in the
registration system. This includes adding, modifying, and deleting profess ors from the system.
The actor of this use case is the Registrar.
4.1.4 Select Courses to Teach
Brief Description:This use case allows a professorto select the course offerings (date- and
time- specific courses will be given) from the course catalog for the courses that he/she is
eligible for and wishes to teach in the upcoming semester. The actor starting this use case is the
Professor. The Course Catalog System is an actor within the use case.
4.1.5 Register for Courses
Brief Description:This use case allows a student to registerfor courses in the current semester.
The student can also modify or delete course selections if changes are made within the
add/drop period at the beginning of the semester. The Billing System is notified of all
registration updates.The Course Catalog provides a list of all the course offerings for the
current semester. The main actor of this use case is the student.The Course Catalog System is
an actor within the use case.
4.1.6 View Report Card
Brief Description:This use case allows a student to view his/her report card for the previously
completed semester. The student is the actor of this use case.
4.1.7 Submit Grades
Brief Description:This use case allows a professorto submit student grades for one or more
classes completed in the previous semester. The actor in this use case is the Professor.
4.1.8 Maintain Student Information
Brief Description:This use case allows the registrar to maintain student information in the
registration system. This includes adding, modifying, and deleting students fromthe system.
The actor for this use case is the Registrar.
5. Logical View
A description of the logical view of the architecture. Describes the most important classes,their
organization in service packages and subsystems,and the organization of these subsystems into layers.
Also describes the most important use-case realizations, for example, the dynamic aspects ofthe
architecture. Class diagrams may be included to illustrate the relationships between architecturally
significant classes,subsystems,packages and layers.
The logical view of the course registration systemis comprised of the 3 main packages: User Interface,
Business Services, and Business Objects.
The User Interface Package contains classes for each of the forms that the actors use to communicate
with the System. Boundary classes exist to support login, maintaining of schedules,maintaining of
professorinfo, selecting courses,submitting grades,maintaining student info, closing registration, and
viewing report cards.
The Business Services Package contains control classes for interfacing with the billing system,
controlling student registration,and managing the student evaluation.
The Business Objects Package includes entity classes for the university artifacts (i.e. course offering,
schedule)and boundary classes for the interface with the Course Catalog System.
5.1 Architecture Overview – Package and Subsystem Layering
5.1.1 Application
layer
This application layer has all the boundary classes that represent the application screens that
the usersees.This layer depends upon the Process Objects layer; that straddles the separation
of the client from mid-tier.
5.1.2 Business Services
layer
The Business Services process layer has all the controller classes that represent the use case
managers that drive the application behavior. This layer represents the client-to-mid-tier
border. The Business Services layer depends upon the Process Objects layer; that straddles the
separation of the client from mid-tier.
5.1.3 Middleware
layer
The Middleware layer supports access to Relational DBMS and OODBMS.
5.1.4 Base Reuse
The Base Reuse package includes classes to support list functions and patterns.
6. Process View
A description of the process view of the architecture. Describes the tasks (processes and threads)
involved in the system's execution, their interactions and configurations. Also describes the allocation
of objects and classes to tasks.
The Process Model illustrates the course registration classes organized as executable processes.
Processes exist to support student registration,professorfunctions,registration closing, and access to
the external Billing System and Course Catalog System.
6.1 Processes
Diagram Name: Processes
6.1.1 CourseCatalogSystemAccess
This process manages access to the legacy Course Catalog System. It can be shared by multiple
users registering for courses.This allows for a cache of recently retrieved courses and offerings
to improve performance.
The separate threads within the CourseCatalog process,CourseCache and OfferingCache are
used to asynchronously retrieve items from the legacy system.
Analysis Mechanisms:
- Legacy Interface
Requirements Traceability:
- Design Constraints: The systemshall integrate with existing legacy system(course catalog
database).
6.1.2 CourseCatalog
The unabbridged catalog of all courses and course offerings offered by the university including
those from previous semesters.
This class acts as an adapter(see the Gamma pattern). It works to makes sure the
CourseCatalogSystem can be accessed through the ICourseCatalog interface to the subsystem.
6.1.3 CourseRegistrationProcess
There is one instance of this process for each student that is currently registering for courses.
6.1.4 RegistrationController
This supports the use case allowing a student to register for courses in the current semester.
The student can also modify or delete course selections if changes are made within the
add/drop period at the beginning of the semester.
Analysis Mechanisms:
- Distribution
6.1.5 StudentApplication
Manages the student functionality, including userinterface processing and coordination with
the business processes.
There is one instance of this process for each student that is currently registering for courses.
6.1.6 MainStudentForm
Controls the interface of the Student application. Controls the family of forms that the Student
uses.
6.1.7 BillingSystemAccess
This process communicates with the external Billing System to initiate student billing.
6.1.8 CloseRegistrationProcess
The Close Registration process is initiated at the end of the registration time period. This
process communicates with the process controlling access to the Billing System.
6.1.9 BillingSystem
The Billing System supports the submitting of student bills for the courses registered for by the
student for the current semester.
Analysis Mechanisms:
- Legacy Interface
6.1.10 CloseRegistrationController
The Close Registration Controller controls access to the Billing System.
Analysis Mechanisms:
- Distribution
6.2 Process to Design
Elements
Diagram Name: Process to Design Elements
6.2.1 CourseCache
The Course Cache thread is used to asynchronously retrieve items from the legacy Course Catalog System.
6.2.2 OfferingCache
The OfferingCashe thread is used to asynchronously retrieve items from the legacy Course Catalog System.
6.2.3 Course
A class offered by the university.
Analysis Mechanisms:
- Persistency
- Legacy Interface
6.2.4 CourseOffering
A specific offering for a course, including days of the week and times.
Analysis Mechanisms:
- Persistency
- Legacy Interface
6.3 Process Model to Design Model Dependencies
Diagram Name: Process Model to Design Model Dependencies
6.4 Processes to the Implementation
Diagram Name: Processes to the Implementation
6.4.1 Remote
* The Remote interface serves to identify all remote objects. Any object that is a remote object
must directly or indirectly implement this interface. Only those methods specified in a remote
interface are available remotely.
* Implementation classes can implement any number of remote interfaces and can extend other
remote implementation classes.
6.4.2 Runnable
* The Runnable interface should be implemented by any class whose instances are intended to
be executed by a thread. The class must define a method of no arguments called run.
* This interface is designed to provide a common protocol for objects that wish to execute code
while they are active. For example, Runnable is implemented by class Thread.
* Being active simply means that a thread has been started and has not yet been stopped.
6.4.3 Thread
* A thread is a thread of execution in a program. The Java Virtual Machine allows an
application to have multiple threads of execution running concurrently.
* Every thread has a priority. Threads with higher priority are executed in preference to threads
with lower priority. Each thread may or may not also be marked as a daemon. When code
running in some thread creates a new Thread object, the new thread has its priority initially set
equal to the priority of the creating thread, and is a daemon thread if and only if the creating
thread is a daemon.
7. Deployment View
A description of the deployment view of the architecture Describes the various physical nodes for the
most typical platform configurations. Also describes the allocation of tasks (from the Process View) to
the physicalnodes.
This section is organized by physical network configuration; each such configuration is illustrated by a
deployment diagram, followed by a mapping of processes to each processor.
Diagram Name: Deployment View
7.1 External Desktop PC
Students register for courses using external desktop PCs which are connected to the College Server
via internet dial up.
7.2 Desktop PC
Students register for courses via local Desktop PCs that are connected directly to the College Server
via LAN. These local PCs are also used by professors to select course and submit student grades.
The Registrar uses these local PCs to maintain student and professorinformation.
7.3 Registration Server
The Registration Server is the main campus UNIX Server. All faculty and students have access to
the Server through the campus LAN.
7.4 Course Catalog
The Course Catalog System is a legacy systemthat contains the complete course catalog. Access to
it is available via the College Server and LAN.
7.5 Billing System
The Billing System (also called the Finance System) is a legacy systemthat generates the student bills
each semester.
8. Size and Performance
The chosen software architecture supports the key sizing and timing requirements, as
stipulated in the Supplementary Specification [15]:
1. The systemshall support up to 2000 simultaneous users against the central database at any
given time, and up to 500 simultaneous users against the local servers at any one time.
2. The systemshall provide access to the legacy course catalog database with no more than a 10
second latency.
3. The systemmust be able to complete 80% of all transactions within 2 minutes.
4. The client portion shall require less than 20 MB disk space and 32 MB RAM.
The selected architecture supports the sizing and timing requirements through the
implementation of a client-server architecture. The client portion is implemented on
local campus PCs or remote dial up PCs. The components have been designed to
ensure that minimal disk and memory requirements are needed on the PC client
portion.
9. Quality
The software architecture supports the quality requirements, as stipulated in the Supplementary
Specification [15]:
1. The desktop user-interface shall be Windows 95/98 compliant.
2. The user interface of the C-Registration Systemshall be designed for ease-of-use and shall be
appropriate for a computer-literate user community with no additional training on the System.
3. Each feature of the C-Registration System shall have built-in online help for the user. Online
Help shall include step by step instructions on using the System. Online Help shall include
definitions for terms and acronymns.
4. The C-Registration System shall be available 24 hours a day, 7 days a week. There shall be no
more than 4% down time.
5. Mean Time Between Failures shall exceed 300 hours.
6. Upgrades to the PC client portion of C-Registration shall be downloadable from the UNIX
Server over the internet. This feature enables students to have easy access to systemupgrades.

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Software architecture document

  • 1. Software Architecture Document C - Registration System
  • 2. Table of Contents 1. Introduction 1.1 Purpose 1.2 Scope 1.3 Definitions, Acronyms and Abbreviations 1.4 References 2. Architectural Representation 3. Architectural Goals and Constraints 4. Use-Case View 4.1 Architecturally-Significant Use Cases 5. Logical View 5.1 Architecture Overview – Package and Subsystem Layering 6. Process View 6.1 Processes 6.2 Process to Design Elements 6.3 Process Model to Design Model Dependencies 6.4 Processes to the Implementation 7. Deployment View 7.1 External Desktop PC 7.2 Desktop PC 7.3 Registration Server 7.4 Course Catalog 7.5 Billing System 8. Size and Performance 9. Quality
  • 3. Software Architecture Document 1. Introduction 1.1 Purpose This document provides a comprehensive architectural overview of the system,using a number of different architectural views to depict different aspects ofthe system.It is intended to capture and convey the significant architectural decisions which have been made on the system. 1.2 Scope This Software Architecture Document provides an architectural overview of the C-Registration System. The C-Registration System is being developed by Wylie College to support online course registration. This Document has been generated directly from the C-Registration Analysis & Design Model implemented in Rose. The majority of the sections have been extracted from the Rose Model using SoDA and the Software Architecture Document template. 1.3 Definitions, Acronyms and Abbreviations See the Glossary [4]. 1.4 References Applicable references are: 1. Course Billing Interface Specification, WC93332, 1985, Wylie College Press. 2. Course Catalog Database Specification, WC93422, 1985, Wylie College Press. 3. Vision Document of the C-Registration System, WyIT387, V1.0, 1998, Wylie College IT. 4. Glossary for the C-Registration System, WyIT406, V2.0, 1999, Wylie College IT. 5. Use Case Spec - Close Registration, WyIT403, V2.0, 1999, Wylie College IT. 6. Use Case Spec – Login, WyIT401, V2.0, 1999, Wylie College IT. 7. Use Case Spec - Maintain Professor Info, WyIT407, Version 2.0, 1999, Wylie College IT. 8. Use Case Spec - Register for Courses, WyIT402, Version 2.0, 1999, Wylie College IT. 9. Use Case Spec - Select Courses to Teach, WyIT405, Version 2.0, 1999, Wylie College IT. 10. Use Case Spec - Maintain Student Info, WyIT408, Version 2.0, 1999, Wylie College IT. 11. Use Case Spec - Submit Grades, WyIT409, Version 2.0, 1999, Wylie College IT. 12. Use Case Spec - View Report Card, WyIT410, Version 2.0, 1999, Wylie College IT. 13. Software Development Plan for the C-Registration System, WyIT418, V1.0, 1999, Wylie College IT. 14. E1 Iteration Plan, WyIT420, V1.0, 1999, Wylie College IT. 15. Supplementary Specification, WyIT400, V1.0, 1999, Wylie College, IT. 2. Architectural Representation This document presents the architecture as a series of views; use case view, logical view, process view and deployment view. There is no separate implementation view described in this document. These are views on an underlying Unified Modeling Language (UML) model developed using Rational Rose.
  • 4. 3. Architectural Goals and Constraints There are some key requirements and systemconstraints that have a significant bearing on the architecture. They are: 1. The existing legacy Course Catalog Systemat Wylie College must be accessed to retrieve all course information for the current semester. The C-Registration System must support the data formats and DBMS of the legacy Course Catalog System [2]. 2. The existing legacy Billing System at Wylie College must be interfaced with to support billing of students.This interface is defined in the Course Billing Interface Specification [1]. 3. All student,professor,and Registrar functionality must be available from both local campus PCs and remote PCs with internet dial up connections. 4. The C-Registration System must ensure complete protection of data from unauthorized access.All remote accesses are subject to user identification and password control. 5. The C-Registration System will be implemented as a client-server system. The client portion resides on PCs and the server portion must operate on the Wylie College UNIX Server. [3] 6. All performance and loading requirements, as stipulated in the Vision Document [3] and the Supplementary Specification [15], must be taken into consideration as the architecture is being developed. 4. Use-Case View A description of the use-case view of the software architecture. The Use Case View is important input to the selection of the set of scenarios and/or use cases that are the focus of an iteration. It describes the set of scenarios and/oruse cases that represent some significant, central functionality. It also describes the set of scenarios and/oruse cases that have a substantialarchitectural coverage (that exercise many architectural elements) or that stress orillustrate a specific, delicate point of the architecture. The C-Registration use cases are: - Login - Register for Courses - Maintain Student Information - Maintain Professor Information - Select Courses to Teach - Submit Grades - View Report Card - Close Registration. These use cases are initiated by the student,professor,or the registrar actors. In addition, interaction with external actors; Course Catalog and Billing System occur. 4.1 Architecturally-Significant Use Cases
  • 5. Diagram Name: Architecturally Significant Use-Cases 4.1.1 Close Registration Brief Description:This use case allows a Registrar to close the registration process.Course offerings that do not have enough students are cancelled. Course offerings must have a minimum of three students in them. The billing systemis notified for each student in each course offering that is not cancelled, so the student can be billed for the course offering. The main actor of this use case is the Registrar. The Billing System is an actor involved within this use case. 4.1.2 Login Brief Description:This use case describes how a userlogs into the Course Registration System. The actors starting this use case are Student, Professor, and Registrar. 4.1.3 Maintain Professor Information
  • 6. Brief Description:This use case allows the registrar to maintain professorinformation in the registration system. This includes adding, modifying, and deleting profess ors from the system. The actor of this use case is the Registrar. 4.1.4 Select Courses to Teach Brief Description:This use case allows a professorto select the course offerings (date- and time- specific courses will be given) from the course catalog for the courses that he/she is eligible for and wishes to teach in the upcoming semester. The actor starting this use case is the Professor. The Course Catalog System is an actor within the use case. 4.1.5 Register for Courses Brief Description:This use case allows a student to registerfor courses in the current semester. The student can also modify or delete course selections if changes are made within the add/drop period at the beginning of the semester. The Billing System is notified of all registration updates.The Course Catalog provides a list of all the course offerings for the current semester. The main actor of this use case is the student.The Course Catalog System is an actor within the use case. 4.1.6 View Report Card Brief Description:This use case allows a student to view his/her report card for the previously completed semester. The student is the actor of this use case. 4.1.7 Submit Grades Brief Description:This use case allows a professorto submit student grades for one or more classes completed in the previous semester. The actor in this use case is the Professor. 4.1.8 Maintain Student Information Brief Description:This use case allows the registrar to maintain student information in the registration system. This includes adding, modifying, and deleting students fromthe system. The actor for this use case is the Registrar. 5. Logical View A description of the logical view of the architecture. Describes the most important classes,their organization in service packages and subsystems,and the organization of these subsystems into layers. Also describes the most important use-case realizations, for example, the dynamic aspects ofthe architecture. Class diagrams may be included to illustrate the relationships between architecturally significant classes,subsystems,packages and layers. The logical view of the course registration systemis comprised of the 3 main packages: User Interface, Business Services, and Business Objects. The User Interface Package contains classes for each of the forms that the actors use to communicate with the System. Boundary classes exist to support login, maintaining of schedules,maintaining of professorinfo, selecting courses,submitting grades,maintaining student info, closing registration, and viewing report cards. The Business Services Package contains control classes for interfacing with the billing system, controlling student registration,and managing the student evaluation.
  • 7. The Business Objects Package includes entity classes for the university artifacts (i.e. course offering, schedule)and boundary classes for the interface with the Course Catalog System. 5.1 Architecture Overview – Package and Subsystem Layering 5.1.1 Application layer This application layer has all the boundary classes that represent the application screens that the usersees.This layer depends upon the Process Objects layer; that straddles the separation of the client from mid-tier. 5.1.2 Business Services layer The Business Services process layer has all the controller classes that represent the use case managers that drive the application behavior. This layer represents the client-to-mid-tier border. The Business Services layer depends upon the Process Objects layer; that straddles the separation of the client from mid-tier.
  • 8. 5.1.3 Middleware layer The Middleware layer supports access to Relational DBMS and OODBMS. 5.1.4 Base Reuse The Base Reuse package includes classes to support list functions and patterns. 6. Process View A description of the process view of the architecture. Describes the tasks (processes and threads) involved in the system's execution, their interactions and configurations. Also describes the allocation of objects and classes to tasks. The Process Model illustrates the course registration classes organized as executable processes. Processes exist to support student registration,professorfunctions,registration closing, and access to the external Billing System and Course Catalog System.
  • 9. 6.1 Processes Diagram Name: Processes 6.1.1 CourseCatalogSystemAccess This process manages access to the legacy Course Catalog System. It can be shared by multiple users registering for courses.This allows for a cache of recently retrieved courses and offerings to improve performance. The separate threads within the CourseCatalog process,CourseCache and OfferingCache are used to asynchronously retrieve items from the legacy system. Analysis Mechanisms: - Legacy Interface Requirements Traceability:
  • 10. - Design Constraints: The systemshall integrate with existing legacy system(course catalog database). 6.1.2 CourseCatalog The unabbridged catalog of all courses and course offerings offered by the university including those from previous semesters. This class acts as an adapter(see the Gamma pattern). It works to makes sure the CourseCatalogSystem can be accessed through the ICourseCatalog interface to the subsystem. 6.1.3 CourseRegistrationProcess There is one instance of this process for each student that is currently registering for courses. 6.1.4 RegistrationController This supports the use case allowing a student to register for courses in the current semester. The student can also modify or delete course selections if changes are made within the add/drop period at the beginning of the semester. Analysis Mechanisms: - Distribution 6.1.5 StudentApplication Manages the student functionality, including userinterface processing and coordination with the business processes. There is one instance of this process for each student that is currently registering for courses. 6.1.6 MainStudentForm Controls the interface of the Student application. Controls the family of forms that the Student uses. 6.1.7 BillingSystemAccess This process communicates with the external Billing System to initiate student billing.
  • 11. 6.1.8 CloseRegistrationProcess The Close Registration process is initiated at the end of the registration time period. This process communicates with the process controlling access to the Billing System. 6.1.9 BillingSystem The Billing System supports the submitting of student bills for the courses registered for by the student for the current semester. Analysis Mechanisms: - Legacy Interface 6.1.10 CloseRegistrationController The Close Registration Controller controls access to the Billing System. Analysis Mechanisms: - Distribution
  • 12. 6.2 Process to Design Elements Diagram Name: Process to Design Elements 6.2.1 CourseCache The Course Cache thread is used to asynchronously retrieve items from the legacy Course Catalog System. 6.2.2 OfferingCache The OfferingCashe thread is used to asynchronously retrieve items from the legacy Course Catalog System. 6.2.3 Course A class offered by the university. Analysis Mechanisms: - Persistency
  • 13. - Legacy Interface 6.2.4 CourseOffering A specific offering for a course, including days of the week and times. Analysis Mechanisms: - Persistency - Legacy Interface 6.3 Process Model to Design Model Dependencies
  • 14. Diagram Name: Process Model to Design Model Dependencies 6.4 Processes to the Implementation Diagram Name: Processes to the Implementation 6.4.1 Remote * The Remote interface serves to identify all remote objects. Any object that is a remote object must directly or indirectly implement this interface. Only those methods specified in a remote interface are available remotely. * Implementation classes can implement any number of remote interfaces and can extend other remote implementation classes. 6.4.2 Runnable
  • 15. * The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread. The class must define a method of no arguments called run. * This interface is designed to provide a common protocol for objects that wish to execute code while they are active. For example, Runnable is implemented by class Thread. * Being active simply means that a thread has been started and has not yet been stopped. 6.4.3 Thread * A thread is a thread of execution in a program. The Java Virtual Machine allows an application to have multiple threads of execution running concurrently. * Every thread has a priority. Threads with higher priority are executed in preference to threads with lower priority. Each thread may or may not also be marked as a daemon. When code running in some thread creates a new Thread object, the new thread has its priority initially set equal to the priority of the creating thread, and is a daemon thread if and only if the creating thread is a daemon. 7. Deployment View A description of the deployment view of the architecture Describes the various physical nodes for the most typical platform configurations. Also describes the allocation of tasks (from the Process View) to the physicalnodes. This section is organized by physical network configuration; each such configuration is illustrated by a deployment diagram, followed by a mapping of processes to each processor.
  • 16. Diagram Name: Deployment View 7.1 External Desktop PC Students register for courses using external desktop PCs which are connected to the College Server via internet dial up. 7.2 Desktop PC Students register for courses via local Desktop PCs that are connected directly to the College Server via LAN. These local PCs are also used by professors to select course and submit student grades. The Registrar uses these local PCs to maintain student and professorinformation. 7.3 Registration Server The Registration Server is the main campus UNIX Server. All faculty and students have access to the Server through the campus LAN. 7.4 Course Catalog The Course Catalog System is a legacy systemthat contains the complete course catalog. Access to it is available via the College Server and LAN. 7.5 Billing System The Billing System (also called the Finance System) is a legacy systemthat generates the student bills each semester.
  • 17. 8. Size and Performance The chosen software architecture supports the key sizing and timing requirements, as stipulated in the Supplementary Specification [15]: 1. The systemshall support up to 2000 simultaneous users against the central database at any given time, and up to 500 simultaneous users against the local servers at any one time. 2. The systemshall provide access to the legacy course catalog database with no more than a 10 second latency. 3. The systemmust be able to complete 80% of all transactions within 2 minutes. 4. The client portion shall require less than 20 MB disk space and 32 MB RAM. The selected architecture supports the sizing and timing requirements through the implementation of a client-server architecture. The client portion is implemented on local campus PCs or remote dial up PCs. The components have been designed to ensure that minimal disk and memory requirements are needed on the PC client portion. 9. Quality The software architecture supports the quality requirements, as stipulated in the Supplementary Specification [15]: 1. The desktop user-interface shall be Windows 95/98 compliant. 2. The user interface of the C-Registration Systemshall be designed for ease-of-use and shall be appropriate for a computer-literate user community with no additional training on the System. 3. Each feature of the C-Registration System shall have built-in online help for the user. Online Help shall include step by step instructions on using the System. Online Help shall include definitions for terms and acronymns. 4. The C-Registration System shall be available 24 hours a day, 7 days a week. There shall be no more than 4% down time. 5. Mean Time Between Failures shall exceed 300 hours. 6. Upgrades to the PC client portion of C-Registration shall be downloadable from the UNIX Server over the internet. This feature enables students to have easy access to systemupgrades.
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