2d barcode generator vb.net Phases of the Design Process in Software

Encoder UPC - 13 in Software Phases of the Design Process

Phases of the Design Process
EAN-13 Supplement 5 Recognizer In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Make EAN / UCC - 13 In None
Using Barcode maker for Software Control to generate, create EAN13 image in Software applications.
The following are phases in design: Data design This phase produces the data structures. Architectural design This phase produces the structural units (classes). Interface design This phase speci es the interfaces between the units. Procedural design This phase speci es the algorithms of each method.
EAN13 Scanner In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
EAN 13 Printer In Visual C#
Using Barcode generator for .NET Control to generate, create EAN / UCC - 13 image in .NET applications.
EXAMPLE 9.3
EAN13 Generator In VS .NET
Using Barcode creation for ASP.NET Control to generate, create EAN13 image in ASP.NET applications.
GS1 - 13 Creation In Visual Studio .NET
Using Barcode maker for .NET framework Control to generate, create GS1 - 13 image in .NET framework applications.
Design the library classes/data structures from the data items in the object model shown in Fig. 9-1 for the library problem (see Examples 8.1 and 2.6). The data design and the architectural phases have been combined in this example. The concentration in this example is on the loan and checkout functionality, with little regard for the other necessary tasks, such as administration, cataloging, assigning overdue fines, retiring books, and patron maintenance. The domain entity book is probably not going to continue into the design. It will be combined with copy into a class/data structure that stores all the information about a copy. It will probably use the ISBN and a copy number as the unique identifier. The patron information will be stored in a second data structure. Each record is probably identified by an unique patron ID number. The loan information may or may not be a separate data structure. If borrowing information needs to be saved beyond the return of the book, then it had better be a separate class/data
Paint EAN-13 Supplement 5 In Visual Basic .NET
Using Barcode creator for Visual Studio .NET Control to generate, create EAN-13 image in Visual Studio .NET applications.
Printing Barcode In None
Using Barcode creator for Software Control to generate, create bar code image in Software applications.
AM FL Y
EAN13 Generator In None
Using Barcode printer for Software Control to generate, create EAN-13 Supplement 5 image in Software applications.
Code 3 Of 9 Creation In None
Using Barcode creation for Software Control to generate, create Code-39 image in Software applications.
CHAPTER 9 Software Design
Print EAN128 In None
Using Barcode generator for Software Control to generate, create USS-128 image in Software applications.
Code 128C Creator In None
Using Barcode creation for Software Control to generate, create Code 128 Code Set A image in Software applications.
library
Encode Uniform Symbology Specification ITF In None
Using Barcode generation for Software Control to generate, create ANSI/AIM ITF 25 image in Software applications.
Recognize EAN / UCC - 13 In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
patron name borrow return
Code 128C Scanner In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
Generate Code128 In None
Using Barcode encoder for Word Control to generate, create Code 128 Code Set A image in Word applications.
book name
Recognizing Data Matrix 2d Barcode In .NET Framework
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in .NET framework applications.
Barcode Generator In Objective-C
Using Barcode creator for iPhone Control to generate, create bar code image in iPhone applications.
loan due date
Code 39 Extended Maker In Java
Using Barcode maker for Android Control to generate, create USS Code 39 image in Android applications.
Scanning Barcode In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
copy borrow check in
Fig. 9-1. Object model for library.
structure. Otherwise, the patron ID can be part of the copy class/data structure along with the due date of the book. Note in Fig. 9-2 that many data items have been added that are more in the implementation/solution space than in the problem/domain space. It can be argued that ISBN is part of the problem space instead of the solution space, but many library systems do not allow normal users to search by ISBN.
library borrow return loan loannumber isbn patronid status due date update status
patron patronid name address loannumber list borrow return
bookcopy isbn copynumber title author status loannumber borrow check in
Fig. 9-2.
Class diagram for library problem.
9.2.1 INTERFACES
An interface speci cation is a speci cation of the external behavior of a module. It should be complete enough so that the calling module knows exactly what the called module will do under any circumstance. It should also be complete enough so that the implementer knows exactly what information must be provided. The interface speci cations in an OO model are often the signatures of the public methods and the semantics associated with the methods. Interfaces can also be speci ed as part of a formal speci cation of the behavior of the whole system. Interfaces can also be the invariants, preconditions, and post-conditions for a method.
EXAMPLE 9.4
CHAPTER 9 Software Design
Design the interfaces for the borrow functions of the library problem using the class diagram produced in Example 9.3. Both patron and bookcopy have borrow methods. Presumably, calling one or the other of these two methods creates the instance of loan. It is not clear from the class diagram which method creates the instance. However, it might be clear if the parameters and return type of each of these methods are specified. method patron::borrow input parameters isbn return type int 0 if book is not available 1 if book is available and loan instance created successfully -1 if error condition method bookcopy::borrow input parameter loannumber return type int 0 if bookcopy is not available 1 if bookcopy updated successfully
Design Concepts
Two approaches to design are known as re nement and modularity: Re nement This design approach develops the design by successively re ning levels of detail. Sometimes this is called top-down design. Modularity This is a structuring approach that divides the software into smaller pieces. All the pieces can be integrated to achieve the problem requirements.
EXAMPLE 9.5
Refine the borrow book function from the library problem. The top level starts with a function borrow book with two parameters, the title of the book and the name of the patron. The next refinement adds the notion of the loan entity. It probably has the following parts: find book given book title, find the patron given patron name, and create loan instance given IDS of book and patron. The next refinement expands each part. Find book returns ISBN if book is found and available, returns zero if book is not found, and returns 1 if book is in use. Find patron returns patron ID if patron is found and is in good standing, returns zero if patron not found, and returns 1 if patron is not eligible to borrow books. Create loan returns 1 if created successfully.
Copyright © OnBarcode.com . All rights reserved.