Source Code : Lookup Performance

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Lookup Performance

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



///////////////////////////////////////////////////////////////////////////////////////
//File: lookup.xml
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="helper" class="MyHelper" singleton="false"/>
    <bean id="abstractLookupBean" class="AbstractLookupDemoBean">
        <lookup-method name="getMyHelper" bean="helper"/>
    </bean>
    <bean id="standardLookupBean" class="StandardLookupDemoBean">
        <property name="myHelper">
            <ref local="helper"/>
        </property>
    </bean>
    <bean id="factoryLookupBean" class="BeanFactoryAwareLookupDemoBean"/>
</beans>



///////////////////////////////////////////////////////////////////////////////////////
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.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");
    }
}
           
       

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