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// Exploring synchronization
aspect WithinAspect {
long locktimer = 0;
int iterations = 0;
Object currentObject = null;
boolean didSomething = false;
long activeTimer;
before(Object o ): within(Useful1) && args(o) {
if (thisJoinPoint.getSignature().toString().startsWith("lock(")) {
activeTimer = System.currentTimeMillis();
didSomething = true;
}
}
after(Object o ): within(Useful1) && args(o) {
if (thisJoinPoint.getSignature().toString().startsWith("unlock(")) {
if (activeTimer!=0) {
locktimer+=(System.currentTimeMillis()-activeTimer);
iterations++;
activeTimer=0;
didSomething = true;
}
}
}
after() returning: execution(* main(..)) {
System.err.println("Average lock taking time over "+iterations+" iterations is "+
(((double)locktimer)/
((double)iterations))+"ms");
if (didSomething) System.err.println("We did time something!"); // can write a test looking for this line, it won't vary
}
}
public class Useful1 {
public static void main(String[] args) {
Useful1 u = new Useful1();
for (int i = 0; i < 2000; i++) {
u.methodWithSynchronizedBlock();
}
}
public void methodWithSynchronizedBlock() {
synchronized (this) {
for (int ii=0;ii<100;ii++);
}
}
}
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