java code for Lookup Demo

/*
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();
}
}

///////////////////////////////////////////////////////////////////////////////////////
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 LookupDemo {

public static void main(String[] args) {
BeanFactory factory = new XmlBeanFactory(new FileSystemResource(
"build/lookup.xml"));

DemoBean abstractBean = (DemoBean) factory.getBean("abstractLookupBean");
DemoBean standardBean = (DemoBean) factory.getBean("standardLookupBean");

displayInfo(standardBean);
displayInfo(abstractBean);

}

public static void displayInfo(DemoBean bean) {
MyHelper helper1 = bean.getMyHelper();
MyHelper helper2 = bean.getMyHelper();

System.out.println("Helper Instances the Same?: "
+ (helper1 == helper2));

StopWatch stopWatch = new StopWatch();
stopWatch.start("lookupDemo");

for (int x = 0; x < 100000; x++) {
MyHelper helper = bean.getMyHelper();
helper.doSomethingHelpful();
}

stopWatch.stop();

System.out.println("100000 gets took " + stopWatch.getTotalTimeMillis()
+ " ms");

}
}