Admin: 1 версия

2010-06-01T06:16:30Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:44Z

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== BeanFactory PreInstantiate Singletons Integration ==



<source lang="java">

File: context.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="instantiationCounterClass"
class="InstantiationCounterClass"/>
</beans>

File: Main.java
import java.util.concurrent.atomic.AtomicInteger;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
public class Main {
public static void main(String[] args) throws Exception {
ConfigurableListableBeanFactory beanFactory = new XmlBeanFactory(new ClassPathResource(
"context.xml"));
System.out.println(InstantiationCounterClass.getNumberOfInstantiations());
beanFactory.preInstantiateSingletons();
System.out.println(InstantiationCounterClass.getNumberOfInstantiations());
}
}
class InstantiationCounterClass {
private static AtomicInteger instantiationCounter = new AtomicInteger(0);
public static int getNumberOfInstantiations() {
return instantiationCounter.get();
}
public InstantiationCounterClass() {
instantiationCounter.incrementAndGet();
}
}

</source>



== Prototype Singleton ==



<source lang="java">
File: context.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="primeIterator"
class="PrimeIterator" singleton="false">
<property name="start" value="1000"/>
</bean>
</beans>

File: Main.java
import java.util.Properties;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
public class Main {
public static void main(String[] args) throws Exception {
BeanFactory beanFactory =
new XmlBeanFactory(
new ClassPathResource(
"context.xml"
)
);
PrimeIterator primeNumber1 = (PrimeIterator)beanFactory.getBean("primeIterator");
PrimeIterator primeNumber2 = (PrimeIterator)beanFactory.getBean("primeIterator");
System.out.println(primeNumber1.getNextPrime());
System.out.println(primeNumber2.getNextPrime());
}
}
class PrimeIterator {
int start = -1;
public int getNextPrime() {
return start;
}
public int getStart() {
return start;
}
public void setStart(int start) {
this.start = start;
}
}

</source>

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Admin: 1 версия

в 18:01, 31 мая 2010