java code for Lookup Performance

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



///////////////////////////////////////////////////////////////////////////////////////
//File: lookup.xml
















///////////////////////////////////////////////////////////////////////////////////////
public interface DemoBean {

public MyHelper getMyHelper();
public void someOperation();
}



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

public class MyHelper {

public void doSomethingHelpful() {
// do something!
}
}

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

public class StandardLookupDemoBean implements DemoBean {

private MyHelper helper;

public void setMyHelper(MyHelper helper) {
this.helper = helper;
}

public MyHelper getMyHelper() {
return this.helper;
}

public void someOperation() {
helper.doSomethingHelpful();
}
}

///////////////////////////////////////////////////////////////////////////////////////
public abstract class AbstractLookupDemoBean implements DemoBean {

public abstract MyHelper getMyHelper();

public void someOperation() {
getMyHelper().doSomethingHelpful();
}
}


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import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;

public class BeanFactoryAwareLookupDemoBean implements BeanFactoryAware,
DemoBean {

private BeanFactory factory = null;

public void setBeanFactory(BeanFactory factory) throws BeansException {
this.factory = factory;
}

public MyHelper getMyHelper() {
return (MyHelper) factory.getBean("helper");
}

public void someOperation() {
getMyHelper().doSomethingHelpful();
}

}
///////////////////////////////////////////////////////////////////////////////////////
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;
import org.springframework.util.StopWatch;

public class LookupPerformance {

public static void main(String[] args) {

BeanFactory factory = new XmlBeanFactory(new FileSystemResource(
"build/lookup.xml"));

DemoBean abstractBean = (DemoBean) factory.getBean("abstractLookupBean");
DemoBean factoryBean = (DemoBean) factory.getBean("factoryLookupBean");

testPerf(abstractBean);
testPerf(factoryBean);
}

public static void testPerf(DemoBean bean) {
StopWatch stopWatch = new StopWatch();
stopWatch.start("perfTest");

for (int x = 0; x < 1000000; x++) {
MyHelper helper = bean.getMyHelper();
helper.doSomethingHelpful();
}

stopWatch.stop();

System.out.println("1000000 gets took "
+ stopWatch.getTotalTimeSeconds() + " seconds");
}
}