Analysis and Design of Software Systems Practical Session 01. System Layering
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1 Analysis and Design of Software Systems Practical Session 01 System Layering
2 Outline Course Overview Course Objectives Computer Science vs. Software Engineering Layered Architectures Selected topics in Java Swing Parsing XML file 2
3 Course Objectives E1 3 E2 1. Planning a new Information System in Engineering methods. One assignment (5%) 2. Functional Approach for A&D Two assignments, 5% each 3. Object-Oriented Approach for A&D Two assignments, 5% each A total of 5 assignments consisting 25% of the course s grade. Test consisting 75% of your grade, OPEN MATERIAL! Please study accordingly. 3
4 Administration E1 3 E2 My is guyrap@cs.bgu.ac.il. Use it! Office Hours: Wednesday, 16:00-18:00, 37/304. Assignments are submitted electronically to FTP, in pairs! Please report problems with submission dates as early as possible (that includes students with reservoir duties). Reservoir soldiers I need your release slips, not the invitations. 4
5 Computer Science stops here. Computer science is no more about computers than astronomy is about telescopes, biology is about microscopes or chemistry is about beakers and test tubes. Science is not about tools, it is about how we use them and what we find out when we do." This quote is actually from Fellows, M.R., and Parberry, I., "SIGACT trying to get children excited about CS", January 1993, Computing Research News. Focus is often about algorithms independent of a particular programming language (or implementation at all ). 5
6 Software Engineering starts here. Software Engineering (SE) is the application of a systematic, disciplined, quantifiable approach to the development, operation, and maintenance of software It is also defined as a systematic approach to the analysis, design, assessment, implementation, test, maintenance and reengineering of software, that is, the application of engineering to software. The term software engineering first appeared in 1968, and was meant to provoke thought regarding the perceived "software crisis" at the time. Recommended Viewing: Glenn Vanderburg s Real Software Engineering confreaks.net/videos/282-lsrc2010-real-software-engineering 6
7 Example CS Problem: Narrow-Shallow-Low-Light Trees with and without Steiner Points Michal Elkin, Shay Solomon SODA'11 Best Student Paper Award, 2011! 7
8 Example SE Problem: Your senior programmer Alice has called-in sick today. How do you keep the project s progress? And without introducing new errors into the system? Software Engineering occurs when people meet programming.. 8
9 That does not mean people do both Of course there are computer scientists who consider the engineering side and software engineers who consider the algorithmic side. But in our course we shall focus mainly on engineering. Let s move on to our first example of applying an engineering concept unto software development. 9
10 System Architecture Architecture High level design of large software systems. Captures the gross structure of a system. Defines software system in terms of components and interactions among those components. Why not write all of our code in a single file? Programmer-friendliness Code readability Flexibility edit or replace parts of the code currently in use. What can we do to further pursue the above objectives? 10
11 Introducing: Layered Systems A layered system is organized hierarchically; each layer provides services to the layer above it and consumes services from the layer below it. Why layers??? Modularity: Separations of concerns Increased maintainability In a pure layered system: Layers are hidden to all except adjacent layers. 11
12 Layered Systems (Cont.) In a pure layered system: Layers are hidden to all except adjacent layers. Pure layered system Not pure layered system 12
13 NOT Layered Systems There is more to layers than the ability to draw separate parts on top of each other. Layers are not a function of just who-uses-what, but are the result of a conscious design decision that allocates software to layers based on considerations such as coupling, cohesion, and likelihood of changes. 13
14 The Three Layers Architecture On the left: an example implementation of a system devoted to sales. Presentation can be GUI, CLI, forms in a browser Some people distinguish the middle layer into Application Layer (Controller layer queries, UI hooks, etc.) and Domain Layer (Business Logic data classes, algorithms). Data layer can be XML, SQL, Mnesia, etc 14
15 Presentation (GUI) Layer Contains the software components responsible for presenting the user with an application interface, which reasonably facilitates interaction of the user with the software product. Which tools are you familiar with? 15
16 Introducing: NetBeans IDE NetBeans is a Java Integrated Development Environment which supports building GUI environments in a very programmer-friendly manner, utilizing SWING. NetBeans employs the GUI that builds a GUI work environment. Unlike in OOP, in this course we expect you to create a Functional GUI but do not emphasize writing it by hand. If this is the first time you re writing Java GUI, this might help you a lot. Final project will demand GUI. 16
17 Domain Logic Layer (Application or Business Logic Layer) Provides the services that implement the functionality offered by the application. This layer is the heart of the system (application). During this course we will further elaborate on this layer. The development process in this course is focused on this layer. 17
18 Persistence layer Provides the services required to ensure the persistence of the data involved in the execution of the application. We will use Extensible Markup Language (XML). Why? 18
19 Why XML? Plain text document indicating an order for 12 Birdsong Clocks, SKU 244: 19
20 Why XML? (cont.) An XML document indicating an order for 12 Birdsong Clocks, SKU 244: Which is better?? 20
21 Why XML? (cont.) XML is more understandable to humans. Given proper names for nodes and attributes, the data s schema is more understandable. XML is more understandable to machines. That is, almost every programming language now ships with an XML parser as part of it s standard library! XML is more generic An XML parser can parse data for many applications. We can easily add nodes and sub-nodes to an XML document, and add more attributes to these nodes the same way we add attributes to our data classes. 21
22 Library Application The XML file contain information about Library, Books and Magazines. The application read data from XML, and write data to XML again. 22
23 Library Application: Architecture Presentation Layer MainFrame class Domain Logic Layer Persistence Layer XMLUtilityManagment class XML actiononlibary class Paper class Book class Magazine class Library class DataManipulate class 23
24 Improvement: Data Mapper The Data Mapper is a layer of software that acts as a mediator between the Domain logic and the Persistence (Data source). Using Data Mapper, the in-memory objects need have no knowledge that there's even a database present. The domain logic (middle layer) will include no SQL interface code, and certainly no knowledge of the database schema. The database schema is always ignorant of the objects that use it. 24
25 One Last Note: Modeling Tools During the course you will be requested to hand your assignments with diagrams included. Class Diagrams Sequence Diagrams State Machine Diagrams There are many available tools to create these artifacts. We recommend you use Visual Paradigm (license can be downloaded from the website). Direct link (updated ): 25
26 Summary Layers partitioning is a common practice to separate concerns and increase maintainability. The system normally could be separated to Presentation, Domain logic, and Persistence. The Data Mapper is a layer of software that acts as a mediator between the in-memory objects and the database. Questions? 26
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