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java.lang.Objectorg.springframework.beans.factory.config.AbstractFactoryBean
org.springframework.beans.factory.config.ObjectFactoryCreatingFactoryBean
FactoryBean which returns a value which is an ObjectFactory that returns a bean from the BeanFactory. As such, this may be used to avoid having a client bean directly calling getBean() the BeanFactory to get a prototype bean out of the BeanFactory, a violation of inversion of control. Instead, with the use of this class, the client bean can be fed an ObjectFactory as a property which directly returns only the one target (usually prototype) bean.
A Sample config in an XML BeanFactory might look as follows:
<beans> <!-- Prototype bean since we have state --> <bean id="myService" class="a.b.c.MyService" singleton="false"> </bean> <bean id="myServiceFactory" class="org.springframework.beans.factory.config.ObjectFactoryCreatingFactoryBean"> <property name="targetBeanName"><idref local="myService"/></property> </bean> <bean id="clientBean" class="a.b.c.MyClientBean"> <property name="myServiceFactory"><ref local="myServiceFactory"/></property> </bean> </beans>
ObjectFactory
Field Summary |
Fields inherited from class org.springframework.beans.factory.config.AbstractFactoryBean |
logger |
Constructor Summary | |
ObjectFactoryCreatingFactoryBean()
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Method Summary | |
protected java.lang.Object |
createInstance()
Template method that subclasses must override to construct the object returned by this factory. |
java.lang.Class |
getObjectType()
Return the type of object that this FactoryBean creates, or null if not known in advance. |
void |
setBeanFactory(BeanFactory beanFactory)
Callback that supplies the owning factory to a bean instance. |
void |
setTargetBeanName(java.lang.String targetBeanName)
Set the name of the target bean. |
Methods inherited from class org.springframework.beans.factory.config.AbstractFactoryBean |
afterPropertiesSet, getObject, isSingleton, setSingleton |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public ObjectFactoryCreatingFactoryBean()
Method Detail |
public void setTargetBeanName(java.lang.String targetBeanName)
public void setBeanFactory(BeanFactory beanFactory)
BeanFactoryAware
Invoked after population of normal bean properties but before an init callback like InitializingBean's afterPropertiesSet or a custom init-method.
setBeanFactory
in interface BeanFactoryAware
beanFactory
- owning BeanFactory (may not be null).
The bean can immediately call methods on the factory.BeanInitializationException
protected java.lang.Object createInstance()
AbstractFactoryBean
Invoked on initialization of this FactoryBean in case of a singleton; else, on each getObject() call.
createInstance
in class AbstractFactoryBean
AbstractFactoryBean.getObject()
public java.lang.Class getObjectType()
FactoryBean
For a singleton, this can simply return getObject().getClass(), or even null, as autowiring will always check the actual objects for singletons. For prototypes, returning a meaningful type here is highly advisable, as autowiring will simply ignore them else.
getObjectType
in interface FactoryBean
ListableBeanFactory.getBeansOfType(java.lang.Class, boolean, boolean)
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