Source Code : Profiling Example

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Profiling Example

/*
Pro Spring
By Rob Harrop
Jan Machacek
ISBN: 1-59059-461-4
Publisher: Apress
*/



///////////////////////////////////////////////////////////////////////////////////////
public class WorkerBean {

    public void doSomeWork(int noOfTimes) {
        for(int x = 0; x < noOfTimes; x++) {
            work();
        }
    }
    
    private void work() {
        System.out.print("");
    }
}


///////////////////////////////////////////////////////////////////////////////////////

import java.lang.reflect.Method;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.util.StopWatch;

public class ProfilingInterceptor implements MethodInterceptor {

    public Object invoke(MethodInvocation invocation) throws Throwable {
        // start the stop watch
        StopWatch sw = new StopWatch();
        sw.start(invocation.getMethod().getName());

        Object returnValue = invocation.proceed();

        sw.stop();
        dumpInfo(invocation, sw.getTotalTimeMillis());
        return returnValue;
    }

    private void dumpInfo(MethodInvocation invocation, long ms) {
        Method m = invocation.getMethod();
        Object target = invocation.getThis();
        Object[] args = invocation.getArguments();

        System.out.println("Executed method: " + m.getName());
        System.out.println("On object of type: " + target.getClass().getName());

        System.out.println("With arguments:");
        for (int x = 0; x < args.length; x++) {
            System.out.print("    > " + args[x]);
        }
        System.out.print("
");

        System.out.println("Took: " + ms + " ms");
    }

}
///////////////////////////////////////////////////////////////////////////////////////

import org.springframework.aop.framework.ProxyFactory;

public class ProfilingExample {

    public static void main(String[] args) {
        WorkerBean bean = getWorkerBean();
        bean.doSomeWork(10000000);
    }
    
    private static WorkerBean getWorkerBean() {
        WorkerBean target = new WorkerBean();
        
        ProxyFactory factory = new ProxyFactory();
        factory.setTarget(target);
        factory.addAdvice(new ProfilingInterceptor());
        
        return (WorkerBean)factory.getProxy();
    }
}


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