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![/** Client */
public class Program {
public static void main(String[] args) {
//Initialize four ellipses
Ellipse ellipse1 = new Ellipse();
Ellipse ellipse2 = new Ellipse();
Ellipse ellipse3 = new Ellipse();
Ellipse ellipse4 = new Ellipse();](https://image.slidesharecdn.com/designpatterns-proxycomposite-140619034242-phpapp02/85/Design-patterns-Proxy-Composite-15-320.jpg)
![/** Client */
public class Program {
public static void main(String[] args) {
//Initialize four ellipses
Ellipse ellipse1 = new Ellipse();
Ellipse ellipse2 = new Ellipse();
Ellipse ellipse3 = new Ellipse();
Ellipse ellipse4 = new Ellipse();
!
//Initialize three composite graphics
CompositeGraphic graphic = new CompositeGraphic();
CompositeGraphic graphic1 = new CompositeGraphic();
CompositeGraphic graphic2 = new CompositeGraphic();](https://image.slidesharecdn.com/designpatterns-proxycomposite-140619034242-phpapp02/85/Design-patterns-Proxy-Composite-16-320.jpg)
![/** Client */
public class Program {
public static void main(String[] args) {
//Initialize four ellipses
Ellipse ellipse1 = new Ellipse();
Ellipse ellipse2 = new Ellipse();
Ellipse ellipse3 = new Ellipse();
Ellipse ellipse4 = new Ellipse();
!
//Initialize three composite graphics
CompositeGraphic graphic = new CompositeGraphic();
CompositeGraphic graphic1 = new CompositeGraphic();
CompositeGraphic graphic2 = new CompositeGraphic();
!
//Composes the graphics
graphic1.add(ellipse1);
graphic1.add(ellipse2);
graphic1.add(ellipse3);
graphic2.add(ellipse4);](https://image.slidesharecdn.com/designpatterns-proxycomposite-140619034242-phpapp02/85/Design-patterns-Proxy-Composite-17-320.jpg)
![/** Client */
public class Program {
public static void main(String[] args) {
//Initialize four ellipses
…
!
//Initialize three composite graphics
…
!
//Composes the graphics
graphic1.add(ellipse1);
graphic1.add(ellipse2);
graphic1.add(ellipse3);
graphic2.add(ellipse4);
graphic.add(graphic1);
graphic.add(graphic2);
!
graphic.add(graphic1);
graphic.add(graphic2);](https://image.slidesharecdn.com/designpatterns-proxycomposite-140619034242-phpapp02/85/Design-patterns-Proxy-Composite-18-320.jpg)
![/** Client */
public class Program {
public static void main(String[] args) {
//Initialize four ellipses
…
!
//Initialize three composite graphics
…
!
//Composes the graphics
…
…
!
…
!
//Prints the complete graphic (4 times "Ellipse").
graphic.print();
}](https://image.slidesharecdn.com/designpatterns-proxycomposite-140619034242-phpapp02/85/Design-patterns-Proxy-Composite-19-320.jpg)
![/** Client */
public class Program {
public static void main(String[] args) {
//Initialize four ellipses
Ellipse ellipse1 = new Ellipse();
Ellipse ellipse2 = new Ellipse();
Ellipse ellipse3 = new Ellipse();
Ellipse ellipse4 = new Ellipse();](https://image.slidesharecdn.com/designpatterns-proxycomposite-140619034242-phpapp02/75/Design-patterns-Proxy-Composite-15-2048.jpg)
![/** Client */
public class Program {
public static void main(String[] args) {
//Initialize four ellipses
Ellipse ellipse1 = new Ellipse();
Ellipse ellipse2 = new Ellipse();
Ellipse ellipse3 = new Ellipse();
Ellipse ellipse4 = new Ellipse();
!
//Initialize three composite graphics
CompositeGraphic graphic = new CompositeGraphic();
CompositeGraphic graphic1 = new CompositeGraphic();
CompositeGraphic graphic2 = new CompositeGraphic();](https://image.slidesharecdn.com/designpatterns-proxycomposite-140619034242-phpapp02/75/Design-patterns-Proxy-Composite-16-2048.jpg)
![/** Client */
public class Program {
public static void main(String[] args) {
//Initialize four ellipses
Ellipse ellipse1 = new Ellipse();
Ellipse ellipse2 = new Ellipse();
Ellipse ellipse3 = new Ellipse();
Ellipse ellipse4 = new Ellipse();
!
//Initialize three composite graphics
CompositeGraphic graphic = new CompositeGraphic();
CompositeGraphic graphic1 = new CompositeGraphic();
CompositeGraphic graphic2 = new CompositeGraphic();
!
//Composes the graphics
graphic1.add(ellipse1);
graphic1.add(ellipse2);
graphic1.add(ellipse3);
graphic2.add(ellipse4);](https://image.slidesharecdn.com/designpatterns-proxycomposite-140619034242-phpapp02/75/Design-patterns-Proxy-Composite-17-2048.jpg)
![/** Client */
public class Program {
public static void main(String[] args) {
//Initialize four ellipses
…
!
//Initialize three composite graphics
…
!
//Composes the graphics
graphic1.add(ellipse1);
graphic1.add(ellipse2);
graphic1.add(ellipse3);
graphic2.add(ellipse4);
graphic.add(graphic1);
graphic.add(graphic2);
!
graphic.add(graphic1);
graphic.add(graphic2);](https://image.slidesharecdn.com/designpatterns-proxycomposite-140619034242-phpapp02/75/Design-patterns-Proxy-Composite-18-2048.jpg)
![/** Client */
public class Program {
public static void main(String[] args) {
//Initialize four ellipses
…
!
//Initialize three composite graphics
…
!
//Composes the graphics
…
…
!
…
!
//Prints the complete graphic (4 times "Ellipse").
graphic.print();
}](https://image.slidesharecdn.com/designpatterns-proxycomposite-140619034242-phpapp02/75/Design-patterns-Proxy-Composite-19-2048.jpg)
Uploaded bySarath C
Design patterns - Proxy & Composite
The document discusses the composite and proxy design patterns. The composite pattern allows grouping objects into tree structures to represent part-whole hierarchies. It defines behaviors for primitive elements and composite elements that can have children. The proxy pattern provides a surrogate for another object to control access to it. A proxy acts as an interface to the real object and can perform additional tasks like access control and caching.
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Design patterns - Proxy & Composite
- 1. Design Patterns Proxy &Composite @sarat, architect Experion Technologies
- 2.
- 3. is a structuralpattern
- 4. Structural design patternsease the design by identifying a simple way to realize relationships between entities
- 5. Compose objects intotree structures to represent part-whole hierarchies. ! describes that a group of objects are to be treated in the same way as a single instance of an object
- 6. Leaf (primitive element) •represents leaf objects in the composition. • A leaf has no children. • defines behavior for primitive objects in the composition
- 7. Composite • defines behaviorfor components having children. • stores child components. • implements child-related operations in the Component interface.
- 8. Client ! • manipulates objectsin the composition through the Component interface.
- 10. /** "Component" */ interfaceGraphic { //Prints the graphic. public void print(); }
- 11. class CompositeGraphic implementsGraphic { //Collection of child graphics. private List<Graphic> childGraphics = new ArrayList<Graphic>();
- 12. class CompositeGraphic implementsGraphic { //Collection of child graphics. private List<Graphic> childGraphics = new ArrayList<Graphic>(); ! //Prints the graphic. public void print() { for (Graphic graphic : childGraphics) { graphic.print(); } }
- 13. class CompositeGraphic implementsGraphic { //Collection of child graphics. private List<Graphic> childGraphics = new ArrayList<Graphic>(); ! //Prints the graphic. public void print() { for (Graphic graphic : childGraphics) { graphic.print(); } } ! //Adds the graphic to the composition. public void add(Graphic graphic) { childGraphics.add(graphic); } //Removes the graphic from the composition. public void remove(Graphic graphic) { childGraphics.remove(graphic); } }
- 14. /** "Leaf" */ classEllipse implements Graphic { //Prints the graphic. public void print() { System.out.println("Ellipse"); } }
- 15. /** Client */ publicclass Program { public static void main(String[] args) { //Initialize four ellipses Ellipse ellipse1 = new Ellipse(); Ellipse ellipse2 = new Ellipse(); Ellipse ellipse3 = new Ellipse(); Ellipse ellipse4 = new Ellipse();
- 16. /** Client */ publicclass Program { public static void main(String[] args) { //Initialize four ellipses Ellipse ellipse1 = new Ellipse(); Ellipse ellipse2 = new Ellipse(); Ellipse ellipse3 = new Ellipse(); Ellipse ellipse4 = new Ellipse(); ! //Initialize three composite graphics CompositeGraphic graphic = new CompositeGraphic(); CompositeGraphic graphic1 = new CompositeGraphic(); CompositeGraphic graphic2 = new CompositeGraphic();
- 17. /** Client */ publicclass Program { public static void main(String[] args) { //Initialize four ellipses Ellipse ellipse1 = new Ellipse(); Ellipse ellipse2 = new Ellipse(); Ellipse ellipse3 = new Ellipse(); Ellipse ellipse4 = new Ellipse(); ! //Initialize three composite graphics CompositeGraphic graphic = new CompositeGraphic(); CompositeGraphic graphic1 = new CompositeGraphic(); CompositeGraphic graphic2 = new CompositeGraphic(); ! //Composes the graphics graphic1.add(ellipse1); graphic1.add(ellipse2); graphic1.add(ellipse3); graphic2.add(ellipse4);
- 18. /** Client */ publicclass Program { public static void main(String[] args) { //Initialize four ellipses … ! //Initialize three composite graphics … ! //Composes the graphics graphic1.add(ellipse1); graphic1.add(ellipse2); graphic1.add(ellipse3); graphic2.add(ellipse4); graphic.add(graphic1); graphic.add(graphic2); ! graphic.add(graphic1); graphic.add(graphic2);
- 19. /** Client */ publicclass Program { public static void main(String[] args) { //Initialize four ellipses … ! //Initialize three composite graphics … ! //Composes the graphics … … ! … ! //Prints the complete graphic (4 times "Ellipse"). graphic.print(); }
- 20.
- 21.
- 22. it makes theclients of a component communicate with a representative rather than to the component Itself.
- 23. enables enhanced efficiency, easieraccess and protection from unauthorized access.
- 24.
- 25.
- 26. large object inmemory
- 27.
- 28. Context • A clientneeds access to the services of another component • Direct access is technically possible, but may not be the best approach
- 29. Problem • Often it’sinappropriate to access the component directly • Direct and unrestricted access can be insecure and inefficient
- 30.
- 31.
- 32.
- 33. safe for bothclient and component
- 34.
- 35. should be similarto component’s interface
- 36.
- 37.
- 38.
- 39. proxy performs pre &post processing (e.g access control)
- 40.
- 41. uses proxy tofulfill it’s task Client
- 42. a common interfacefor proxy and original AbstractOriginal
- 43. provides interface ofthe original to clients proxy
- 44. ensures safe, efficientand correct access to the original proxy
- 45.
- 46.
- 48.
- 50.
- 51.
- 52. remove all direct relationshipwith client and original
- 53.
- 54. To shield networkaddresses and inter-process communication protocols from clients Remote Proxy
- 55. Access authorization e.gnetwork authorization to use Internet Protection Proxy
- 56. Multiple local componentscan share results from a remote proxy e.g. Cache server Cache Proxy
- 57. Provide synchronized accessto services in a multi-access or multi- threaded environment Synchronization Proxy
- 58. Prevents accidental deletionof components or collects usage statistics e.g. reference counting objects Counting Proxy
- 59. Protects local clientsfrom outside world Firewall proxy
- 60.
- 61. enhanced efficiency and lowercost e.g. cache proxy
- 62. decouple clients from realobjects
- 63.
- 64.
- 65. less efficiency dueto indirection
- 66. overkill using sophisticatedstrategies ! e.g. caching server in a dynamic environment
- 67.