类 ObjectFactoryCreatingFactoryBean
- java.lang.Object
- org.springframework.beans.factory.config.AbstractFactoryBean<ObjectFactory<Object>>
- org.springframework.beans.factory.config.ObjectFactoryCreatingFactoryBean
- 所有已实现的接口:
Aware
,BeanClassLoaderAware
,BeanFactoryAware
,DisposableBean
,FactoryBean<ObjectFactory<Object>>
,InitializingBean
public class ObjectFactoryCreatingFactoryBean extends AbstractFactoryBean<ObjectFactory<Object>>
AFactoryBean
implementation that returns a value which is anObjectFactory
that in turn returns a bean sourced from aBeanFactory
.As such, this may be used to avoid having a client object directly calling
BeanFactory.getBean(String)
to get a (typically prototype) bean from aBeanFactory
, which would be a violation of the inversion of control principle. Instead, with the use of this class, the client object can be fed anObjectFactory
instance as a property which directly returns only the one target bean (again, which is typically a prototype bean).A sample config in an XML-based
BeanFactory
might look as follows:<beans> <!-- Prototype bean since we have state --> <bean id="myService" class="a.b.c.MyService" scope="prototype"/> <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="myServiceFactory"/> </bean> </beans>
The attendant
MyClientBean
class implementation might look something like this:package a.b.c; import org.springframework.beans.factory.ObjectFactory; public class MyClientBean { private ObjectFactory<MyService> myServiceFactory; public void setMyServiceFactory(ObjectFactory<MyService> myServiceFactory) { this.myServiceFactory = myServiceFactory; } public void someBusinessMethod() { // get a 'fresh', brand new MyService instance MyService service = this.myServiceFactory.getObject(); // use the service object to effect the business logic... } }
An alternate approach to this application of an object creational pattern would be to use the
ServiceLocatorFactoryBean
to source (prototype) beans. TheServiceLocatorFactoryBean
approach has the advantage of the fact that one doesn't have to depend on any Spring-specific interface such asObjectFactory
, but has the disadvantage of requiring runtime class generation. Please do consult theServiceLocatorFactoryBean JavaDoc
for a fuller discussion of this issue.- 从以下版本开始:
- 1.0.2
- 作者:
- Colin Sampaleanu, Juergen Hoeller
- 另请参阅:
ObjectFactory
,ServiceLocatorFactoryBean
字段概要
从类继承的字段 org.springframework.beans.factory.config.AbstractFactoryBean
logger
从接口继承的字段 org.springframework.beans.factory.FactoryBean
OBJECT_TYPE_ATTRIBUTE
构造器概要
构造器 构造器 说明 ObjectFactoryCreatingFactoryBean()
方法概要
所有方法 实例方法 具体方法 修饰符和类型 方法 说明 void
afterPropertiesSet()
Eagerly create the singleton instance, if necessary.protected ObjectFactory<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.从类继承的方法 org.springframework.beans.factory.config.AbstractFactoryBean
destroy, destroyInstance, getBeanFactory, getBeanTypeConverter, getEarlySingletonInterfaces, getObject, isSingleton, setBeanClassLoader, setBeanFactory, setSingleton
构造器详细资料
ObjectFactoryCreatingFactoryBean
public ObjectFactoryCreatingFactoryBean()
方法详细资料
setTargetBeanName
public void setTargetBeanName(String targetBeanName)
Set the name of the target bean.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).
afterPropertiesSet
public void afterPropertiesSet() throws Exception
从类复制的说明:AbstractFactoryBean
Eagerly create the singleton instance, if necessary.- 指定者:
afterPropertiesSet
在接口中InitializingBean
- 覆盖:
afterPropertiesSet
在类中AbstractFactoryBean<ObjectFactory<Object>>
- 抛出:
Exception
- in the event of misconfiguration (such as failure to set an essential property) or if initialization fails for any other reason
getObjectType
public Class<?> getObjectType()
从类复制的说明:AbstractFactoryBean
This abstract method declaration mirrors the method in the FactoryBean interface, for a consistent offering of abstract template methods.- 指定者:
getObjectType
在接口中FactoryBean<ObjectFactory<Object>>
- 指定者:
getObjectType
在类中AbstractFactoryBean<ObjectFactory<Object>>
- 返回:
- the type of object that this FactoryBean creates, or
null
if not known at the time of the call - 另请参阅:
FactoryBean.getObjectType()
createInstance
protected ObjectFactory<Object> createInstance()
从类复制的说明:AbstractFactoryBean
Template method that subclasses must override to construct the object returned by this factory.Invoked on initialization of this FactoryBean in case of a singleton; else, on each
AbstractFactoryBean.getObject()
call.- 指定者:
createInstance
在类中AbstractFactoryBean<ObjectFactory<Object>>
- 返回:
- the object returned by this factory
- 另请参阅:
AbstractFactoryBean.getObject()