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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LookupPerformance.zip( 1,479 k)