Categories
cloning java spring

Spring: Create new instance of bean for each call of get method

I have next situation:
Connection manager should have each time one object of ConnectionServer and new objects of DataBean
So, I have created these beans and configured out it spring xml.

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<bean id="dataBena" class="com.test.DataBean" scope="prototype"/>
<bean id="servCon" class="com.test.ServerCon"/>
<!--<bean id="test" class="com.test.Test"/>-->
<context:component-scan base-package="com.test"/>
</beans>

and added scope prototype for DataBean

After this I’ve created simple util/component class called Test

@Component
public class Test {
@Autowired
private DataBean bean;
@Autowired
private ServerCon server;
public DataBean getBean() {
return bean.clone();
}
public ServerCon getServer() {
return server;
}
}

BUT, Each time of calling getBean() method I am cloning this bean, and this is the problem to me.
Can I do it from spring configuration without usning clone method?
Thanks.

You are looking for lookup method functionality in Spring. The idea is that you provide an abstract method like this:

@Component
public abstract class Test {
public abstract DataBean getBean();
}

And tell Spring that it should implement it at runtime:

<bean id="test" class="com.test.Test">
<lookup-method name="getBean" bean="dataBean"/>
</bean>

Now every time you call Test.getBean you will actually call Spring-generated method. This method will ask ApplicationContext for DataBean instance. If this bean is prototype-scoped, you will get new instance each time you call it.

I wrote about this feature here.