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At this point, you ve implemented everything on your original feature list You have usersubmittable and user-editable snippets, with tagging and with sorting by language You also have bookmarking and rating features as well as some aggregate views to display things like the top-rated and most-bookmarked snippets and the most-used languages Along the way, you ve learned how to work with Django s form system, and you ve picked up some advanced tricks for working with the object-relational mapper and the template engine Of course, you could still add a lot more features at this point: Following up on your experiences with the weblog application, you could easily add comments (with moderation) and feeds You could borrow the content-retrieving template tags you wrote for the weblog and use them to retrieve the latest snippets or adapt them to perform some of the custom queries you ve written for this application.

Many Canon cameras use a similar system to the Panasonic remote shutter release, but with a commonly available stereo 3.5mm connector instead. The Canon system uses all three connections in the plug one for ground and the other two for the focus and shoot switches making it even simpler to assemble (see Figure 3-5). In fact, all you need to build your own Canon external shutter release is a 3.5mm plug, two push buttons, and some wire. In this project, we ll use the same circuit, but rather than using manual switches, we ll make a cable that connects the camera to the reed relay outputs to control focus and shoot.

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public int getValue() { return value; } @Override public void visit(Visitor v) { v.visitNumber(this); } } public interface Visitor { public void visitPlus(Plus s); public void visitNumber(Number n); } This gives you a model that can only represent numbers and the plus operation. However, it s powerful enough to create a structure for expressions such as 1 + 1 or 1 + 2 + 3. It also lets you easily create write operations on such models. For example, you can print any expression by writing the following: public class PrintVisitor implements Visitor { StringBuffer sb = new StringBuffer(); public void visitPlus(Plus s) { s.getFirst().visit(this); sb.append(" + "); s.getSecond().visit(this); } public void visitNumber(Number n) { sb.append (n.getValue()); } } @Test public void printOnePlusOne() { Number one = new Number(1); Expression plus = new Plus(one, one); PrintVisitor print = new PrintVisitor(); plus.visit(print); assertEquals("1 + 1", print.sb.toString()); } These are all well-known basics from any programming book. However, let s simulate some problems now. Let s evolve the language by improving it to support yet another construct. Imagine you want to add -. It s natural to then introduce a new class: /** @since 2.0 */ public final class Minus extends Expression { private final Expression first; private final Expression second; public Minus(Expression first, Expression second) {

Figure 3-5. Manual control cable for Canon cameras Strip back one end of the shielded cable and solder it onto a 3.5mm stereo line plug, using the shield for the sleeve connection and one of the internal conductors for the ring next to it. Connect the other conductor to the tip. Our personal preference is to be consistent with the audio color codes typically used in 3.5mm plugs and connect the red conductor to the ring (the focus connection), and white to the tip (the shoot connection). Then strip back the other end of the shielded cable and solder on another 3.5mm stereo line plug using the exact some connections, forming a straight through cable that connects the sleeve on one

this.first = first; this.second = second; } public Expression getFirst() { return first; } public Expression getSecond() { return second; } public void visit(Visitor v) { /* now what add new method to an interface! */ v.visitMinus(this); } } However, simply adding the data class is not enough. You also need to enhance the Visitor with a new visitMinus method. However, this is easier said than done because adding the method into an interface is not compatible evolution. It might not fail during linkage, although the old code is no longer compilable against the new version of the Visitor interface. The new version adds a new unimplemented method. Also, execution will fail with java.lang. AbstractMethodError as soon as someone tries to feed the old visitor with new data structures: Number one = new Number(1); Number two = new Number(2); Expression plus = new Minus(one, two); PrintVisitor print = new PrintVisitor(); plus.visit(print); // fails with AbstractMethodError assertEquals("1 - 2", print.sb.toString()); It appears that an inevitable evolution problem is hidden in this popular design pattern. It might work fine for the design of in-house systems, but as soon as it appears in a publicly available API, it almost immediately renders itself nonextensible. That is why this pattern is not suitable for designing a universe, at least not in its current form. You need to find a clever reincarnation of a visitor that will be appropriate for the API design pattern constraints. The reincarnation will be discussed as part of the mental exercise that you ll perform in the following sections.

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