public class ProviderCreatingFactoryBean extends AbstractFactoryBean<Provider<Object>>
FactoryBean
implementation that
returns a value which is a JSR-330 Provider
that in turn
returns a bean sourced from a BeanFactory
.
This is basically a JSR-330 compliant variant of Spring's good old
ObjectFactoryCreatingFactoryBean
. It can be used for traditional
external dependency injection configuration that targets a property or
constructor argument of type javax.inject.Provider
, as an
alternative to JSR-330's @Inject
annotation-driven approach.
Provider
,
ObjectFactoryCreatingFactoryBean
logger
Constructor and Description |
---|
ProviderCreatingFactoryBean() |
Modifier and Type | Method and Description |
---|---|
void |
afterPropertiesSet()
Eagerly create the singleton instance, if necessary.
|
protected Provider<Object> |
createInstance()
Template method that subclasses must override to construct
the object returned by this factory.
|
Class<?> |
getObjectType()
This abstract method declaration mirrors the method in the FactoryBean
interface, for a consistent offering of abstract template methods.
|
void |
setTargetBeanName(String targetBeanName)
Set the name of the target bean.
|
destroy, destroyInstance, getBeanFactory, getBeanTypeConverter, getEarlySingletonInterfaces, getObject, isSingleton, setBeanClassLoader, setBeanFactory, setSingleton
public void setTargetBeanName(String targetBeanName)
The target does not have to be a non-singleton bean, but realistically always will be (because if the target bean were a singleton, then said singleton bean could simply be injected straight into the dependent object, thus obviating the need for the extra level of indirection afforded by this factory approach).
public void afterPropertiesSet() throws Exception
AbstractFactoryBean
afterPropertiesSet
in interface InitializingBean
afterPropertiesSet
in class AbstractFactoryBean<Provider<Object>>
Exception
- in the event of misconfiguration (such
as failure to set an essential property) or if initialization fails.public Class<?> getObjectType()
AbstractFactoryBean
getObjectType
in interface FactoryBean<Provider<Object>>
getObjectType
in class AbstractFactoryBean<Provider<Object>>
null
if not known at the time of the callFactoryBean.getObjectType()
protected Provider<Object> createInstance()
AbstractFactoryBean
Invoked on initialization of this FactoryBean in case of
a singleton; else, on each AbstractFactoryBean.getObject()
call.
createInstance
in class AbstractFactoryBean<Provider<Object>>
AbstractFactoryBean.getObject()