Talk:Proxy pattern

proxy

Isn't the Firewall proxy the same as Protection proxy? no91.186.200.21 12:51, 11 November 2007 (UTC)

ProxyImage code is overengineered

import java.util.*;
 
class RealImage {
    private String filename;
    private Image image;
 
    public RealImage(String filename) { this.filename = filename; }
    public void displayImage() {
        if (image == null) {
            loadImageFromDisk(); // load only on demand
        }
        // Display image code here.
    }

    private void loadImageFromDisk() {
        // Potentially expensive operation
        // ...
        // initializes image object
        System.out.println("Loading   "+filename);
    }
}
 
class ProxyExample {
    public static void main(String[] args) {
        RealImage image1 = new RealImage("HiRes_10MB_Photo1") );
        RealImage image2 = new RealImage("HiRes_10MB_Photo2") );

        image1.displayImage(); // loading necessary
        image2.displayImage(); // loading necessary
        image2.displayImage(); // no loading necessary; already done
        // the third image will never be loaded - time saved!
    }
}

The proxy pattern isn't needed at all!!! Diegofd (talk) 16:11, 16 May 2008 (UTC)

I agree, this is a bad example User:Sebastian 10.02, 11.04.2012 (GMT+1) — Preceding unsigned comment added by 87.79.66.31 (talk) 08:03, 11 April 2012 (UTC)

Copyright violation?

This edit seems a copyright violation from http://userpages.umbc.edu/~tarr/dp/lectures/Proxy.pdf (4/4/2004; 69 KB) the date of pdf is set before the edit Lusum (talk) 11:23, 11 June 2008 (UTC)

Diagram arrows incorrect?

I think the "extends" arrows from both RealSubject and Proxy to Subject interface should be dotted/dashed and not solid. Solid indicates "is a"/generalisation for use in sub-classing of classes or abstract classes, dotted/dashed indicates implementation/realisation of an interface. And note, you can not sub-class an interface. 14:08, 13 April 2012 (UTC) — Preceding unsigned comment added by 78.105.136.120 (talk)

The example does not seem to demonstrate this pattern

This seems like more of a Lazy Initialization pattern than anything else. If it were a true Proxy, wouldn't the RealImage be defined beforehand and passed to the Proxy? The Proxy shouldn't know the filename or be able to create the RealImage. Or am I missing something? - TheSOB (talk) 17:54, 25 September 2013 (UTC)

Copyright violation?

The usage and scenario sections are the same as http://www.dotnetexamples.com/2013/07/proxy-design-pattern.html 217.155.35.160 (talk) 12:01, 22 December 2014 (UTC)