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  142. 

  143. <h3 align="center">AspectJ Language Design</h3>

  144. 

  145. <h4>User-suggested New Language Features</h4>

  146. <ul>

  147. 	<li>&quot;-&quot; wildcard<ul>

  148. 	<li>

  149. 	<a href="http://dev.eclipse.org/mhonarc/lists/aspectj-dev/msg00717.html">

  150. 	http://dev.eclipse.org/mhonarc/lists/aspectj-dev/msg00717.html</a> </li>

  151. 	<li><a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=34054#c2">

  152. 	https://bugs.eclipse.org/bugs/show_bug.cgi?id=34054#c2</a> </li>

  153. </ul>

  154. 	</li>

  155. 	<li>Class cast pointcut<ul>

  156. 	<li>

  157. 	<a href="http://dev.eclipse.org/mhonarc/lists/aspectj-users/msg01479.html">

  158. 	http://dev.eclipse.org/mhonarc/lists/aspectj-users/msg01479.html</a> </li>

  159. </ul>

  160. 	</li>

  161. 	<li>Extensible pointcuts, abstract pointcuts, and interfaces<ul>

  162. 		<li>

  163. 		<a href="http://dev.eclipse.org/mhonarc/lists/aspectj-dev/msg00458.html">

  164. 		http://dev.eclipse.org/mhonarc/lists/aspectj-dev/msg00458.html</a></li>

  165. 		<li>

  166. 		<a href="http://dev.eclipse.org/mhonarc/lists/aspectj-dev/msg00467.html">

  167. 		http://dev.eclipse.org/mhonarc/lists/aspectj-dev/msg00467.html</a> <br>&nbsp;</li>

  168. 	</ul>

  169. 	</li>

  170. </ul>

  171. <h4>Key Language Design Properties</h4>

  172. <p>(1) Orthogonal join point model - the different kinds of join points, the 

  173. different primitive pointcuts, and the different kinds of advice can be used in 

  174. any combination.</p>

  175. <p>This was one of the hardest parts of the design to get right, because of the 

  176. &quot;constructor must call super&quot; rule in Java. But we finally got this in 1.0.<br>

  177. <br>

  178. (2) Pointcuts support composition and abstraction. Abelson and Sussman say that 

  179. composition and abstraction are the key elements of a real language. Clearly the 

  180. pointcut mechanism is the new thing in AspectJ, and so it was critical that it 

  181. support composition and abstraction. The fact that someone can write:</p>

  182. <blockquote>

  183. 	<p><font face="Courier">/* define an abstraction called stateChange */<br>

  184. 	pointcut stateChange(): call(void FigureElement+.set*(*));<br>

  185. 	<br>

  186. 	/* compose pointcuts to get other pointcuts */<br>

  187. 	pointcut topLevelStateChange(): stateChange() `<br>

  188. 	&amp;&amp; !cflowbelow(stateChange());</font></p>

  189. </blockquote>

  190. <p>is what makes it possible for people to really work with crosscutting 

  191. structure and make their code more clear.<br>

  192. <br>

  193. (3) Statically type checked. The efficiency, code quality and programmer 

  194. productivity arguments for this have been made elsewhere, so I won't repeat 

  195. them. <br>

  196. <br>

  197. (4) Efficient. AspectJ code is as fast as the equivalent functionality, written 

  198. by hand, in a scattered and tangled way.<br>

  199. <br>

  200. (5) Simple kernel. I've heard some people say that AspectJ is too big and too 

  201. complex. In the most important sense of simple AspectJ is simple. I can reason 

  202. about any AspectJ program with a simple model. The kernel of AspectJ is simple, 

  203. and the orthogonality described above means that its easy to start with just the 

  204. kernel and slowly add to that.</p>

  205. <p>Its pretty clear to pull out this kernel of AspectJ. I would argue that the 

  206. right idea for a standard AOP API<br>

  207. is this kernel, packaged in a way that allows building more sophisticated tools 

  208. on top of it.<br>

  209. <br>

  210. (6) Supports multiple weave times. AspectJ is neutral on whether weaving happens 

  211. at pre-process, compile, post-process, load, JIT or runtime. This neutrality is 

  212. critical. Its why there are serious JVM experts who are already thinking about 

  213. JVM support for AspectJ.</p>

  214. <p>There's more, but I think these are the most important ones. I think any 

  215. functionality this group comes up with should also meet these criteria.<br>

  216. &nbsp;</p>

  217. 

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  220. </html>