Spring 2005 ECE450H1S Software Engineering IITutorial 6Aspect-oriented programmingHow to program an aspect?Tool support in aspectJ, AJDTSpring 2005 ECE450H1S Software Engineering IILast lecture…On Aspect-Orientation• We explained the concepts of aspect-orientation:a recent paradigm in Software Engineering• We shown a case study of aspect-orientedrequirements engineering: (1) how to identifyearly aspects along with goal-orientedrequirements analysis, (2) how the goal aspectsare associated with the code aspects …• What are code aspects?Spring 2005 ECE450H1S Software Engineering IIThis tutorial will cover code aspects:1. AOP examples2. aspectJ syntax3. Eclipse/AJDT toolset4. Relation to the OpenOME5. How to deploy of our phase B results …Today…Spring 2005 ECE450H1S Software Engineering II1. AspectJ• It is one of the most mature aspectcompilershttp://www.eclipse.org/aspectj• It has convenient tool support throughEclipsehttp://www.eclipse.org/ajdtSpring 2005 ECE450H1S Software Engineering II1.1 Example: the Hello classSee the online tutorialSpring 2005 ECE450H1S Software Engineering II1.2 Enable the World aspectSpring 2005 ECE450H1S Software Engineering II1.3 Run the woven codeSpring 2005 ECE450H1S Software Engineering II2 The AspectJ syntax• aspect vs. class• advice vs. method– before(), after(), around()– allow formal parameters in regular expressions– special parameter joinpoint– allow “theJoinPoint” to access the call stack– around() can call the replaced method with proceed()• (anonymous) pointcut vs. expression– just like any boolean expression, where the predicates are joinpoints• joinpoints– call(), execute(): method calls (caller), execution (callee), try/catch blocks– set(), get(): field accesses– within(): to limit the scopes to method, class or packages• declarations– Change the class structures: introducing fields, method, structural relationsReferenceThe “quickref” document:Spring 2005 ECE450H1S Software Engineering II3 Some AJDT features3.1 The tracer ex. without aspectSpring 2005 ECE450H1S Software Engineering II3.2 The Tracer example with aspectSpring 2005 ECE450H1S Software Engineering II3.3 A visualizerSpring 2005 ECE450H1S Software Engineering II4. Applying to the OpenOME• I would show you an AOP example inOpenOME, however …• AJDT requires more Memory resources,when I was compiling it with the completeOpenOME … Memory overflow problem• Gold plating in AJDT?Spring 2005 ECE450H1S Software Engineering IIThe effects of the woven codeSpring 2005 ECE450H1S Software Engineering IIVisualizing the trace aspectSpring 2005 ECE450H1S Software Engineering II5. Hosting the course projects• We have 11 teams, codenames are:mindz, photons, team2, xteam, lumiere solutions, mugqq, overnightenterprise, team7, websilon, team9, canadiantired• Any windows ECF lab, use “terminal services”, the first server isdedicated for us, enter your team’s code name as username,“ece450” as password for now, you can access it, only within the labfor now• The URL of the tomcat server ishttp://127.0.0.1:8080• The deployed web service should be placed under c:\programfiles\apache software foundation\tomcat 5.5\webapps\axis\WEB-INF\classes\<codename>• These directories are shared as\\128.100.36.17\<codename> sothat you can copy the binary files into the place• We also installed an Eclipse plugin for collecting metrics in the ECFwindows