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// Exploring synchronization
aspect LockMonitor {
long locktimer = 0;
int iterations = 0;
Object currentObject = null;
long activeTimer;
before(Useful2 o ): lock() && args(o) {
activeTimer = System.currentTimeMillis();
currentObject = o;
}
after(Useful2 o ): unlock() && args(o) {
if (o!=currentObject) {
throw new RuntimeException("Unlocking on incorrect thing?!?");
}
if (activeTimer!=0) {
locktimer+=(System.currentTimeMillis()-activeTimer);
iterations++;
activeTimer=0;
}
}
after() returning: execution(* main(..)) {
System.err.println("Average time spent with lock over "+iterations+" iterations is "+
(((double)locktimer)/
((double)iterations))+"ms");
}
}
public class Useful2 {
public static void main(String[] args) {
Useful2 u = new Useful2();
for (int i = 0; i < 20; i++) {
u.methodWithSynchronizedBlock();
}
}
public void methodWithSynchronizedBlock() {
synchronized (this) {
for (int ii=0;ii<1000000;ii++);
}
}
}
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