![© RAGINIJAIN CC SA 4.0
Illustrative code
import java.awt.*;
import java.awt.event.*;
public class RJCanvas extends Canvas {
static {
System.loadLibrary("rjrender");
}
public native void paint(Graphics g);
public static void main(String[] args) {
Frame f = new Frame();
f.setBounds( 0, 0, 500, 110 );
f.add( new RJCanvas() );
f.addWindowListener( new WindowAdapter() {
public void windowClosing( WindowEvent ev ) {
System.exit(0);
}
} );
f.show();
}
}
librjrender.so
Canvas
Frame
Graphics Context
/usr/lib64/jvm/jre/lib/amd64/libjawt.so](https://image.slidesharecdn.com/rj-swarch-151010175132-lva1-app6892/85/Software-Architecture-9-320.jpg)
Software Architecture
- 1. © RAGINIJAIN CC SA 4.0 Ragini Jain MSc CA 1st Year (2015 - 2017) Software Architecture
- 2. © RAGINIJAIN CC SA 4.0 Overview ● Software architecture ● Architectural analysis ● Architectural style ● Software Architecture and Software engineering ● Software architecture (AWT → Swing → Swing 2.x) ● Summary ● References
- 3. © RAGINIJAIN CC SA 4.0 Software Architecture ● A set of principal design decisions about the system. ● A blueprint for a system's construction and evolution ● Software architecture = Elements , Form, Rationale ● Software architecture deals with – Abstraction – Decomposition – Composition – Style – Aesthetics What How Why
- 4. © RAGINIJAIN CC SA 4.0 Layered Architecture Style Java OpenJDK Java libraries
- 5. © RAGINIJAIN CC SA 4.0 Case study – AWT – Problem statement ● Conceptualize and Architect a platform-independent – Windowing – Graphics – User-interface widget toolkit
- 6. © RAGINIJAIN CC SA 4.0 AWT architecture challenge Java Native Code AWT: Window , Graphics , User interface Widget Microsoft Windows UNIX /Solaris X11 environment
- 7. © RAGINIJAIN CC SA 4.0 AWT architecture is a 2-level toolkit with API AWT Object-Oriented Abstraction Windowing, Events and Layout managers GUI widgets – buttons, text boxes and menus Canvas Drawing surface
- 8. © RAGINIJAIN CC SA 4.0 Abstract Window Toolkit architecture
- 9. © RAGINIJAIN CC SA 4.0 Illustrative code import java.awt.*; import java.awt.event.*; public class RJCanvas extends Canvas { static { System.loadLibrary("rjrender"); } public native void paint(Graphics g); public static void main(String[] args) { Frame f = new Frame(); f.setBounds( 0, 0, 500, 110 ); f.add( new RJCanvas() ); f.addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent ev ) { System.exit(0); } } ); f.show(); } } librjrender.so Canvas Frame Graphics Context /usr/lib64/jvm/jre/lib/amd64/libjawt.so
- 10. © RAGINIJAIN CC SA 4.0 Software Architecture and Engineering ● An architecture is a composition and interplay of different elements ● Engineering delivers by using two artifacts – Components ● Encapsulate processing and data – eg. AWT classes, Interfaces and native library modules – Connectors ● Application independent interaction facility – eg. shared memory connector (Graphics context) ● Working code is the proof of the architecture and trade-offs – Refactoring the toolkit library ● Move from heavy AWT to light-weight swing component
- 11. © RAGINIJAIN CC SA 4.0 Decoupled architecture ● Event handling in User Interface (UI) can be quite challenging given a large number of components and events. ● To address this complexity, we need to incorporate Architectural style. – A named collection of architectural design decisions ● Event handling – Data is the Model – Visual representation is the View – Code that responds to events and updates is the Controller
- 12. © RAGINIJAIN CC SA 4.0 Model-View Controller (MVC) architecture
- 13. © RAGINIJAIN CC SA 4.0 Engineering the MVC architecture Swing MVC public void installUI(JComponent c); public void uninstallUI(JComponent c);
- 14. © RAGINIJAIN CC SA 4.0 Impact of modified MVC Swing architecture ● Separable Model architecture – A separate model interface for each component that has a logical data or value abstraction. ● Swing models – GUI state model – Application state model
- 15. © RAGINIJAIN CC SA 4.0 Summary ● Software Architecture is a blueprint and incorporates every facet of the system – Structure – Behaviour – Interaction – Non-functional properties ● Not all design decisions are architectural ● Architecture evolves with experience gained from previous versions of the software or similar designs. ● Frameworks (servlet) , Toolkits (Git), libraries (openGL) are manifestation of software architecture.
- 16. © RAGINIJAIN CC SA 4.0 References Community of thought leaders of software architecture and patterns Amy Fowler, Swing Architecture, www.oracle.com/technetwork/java/architecture142923.html
- 17. © RAGINIJAIN CC SA 4.0 References
- 18. © RAGINIJAIN CC SA 4.0 References
- 19. © RAGINIJAIN CC SA 4.0 Thank you. ● Questions ● Clarifications ● Suggestions ● Feedback Ragini Jain 15030142023@sicsr.ac.in