org.springframework.web.socket.config

Class MessageBrokerBeanDefinitionParser.DecoratingFactoryBean

java.lang.Object

org.springframework.web.socket.config.MessageBrokerBeanDefinitionParser.DecoratingFactoryBean

All Implemented Interfaces:

FactoryBean<WebSocketHandler>

Enclosing class:

MessageBrokerBeanDefinitionParser

private static class MessageBrokerBeanDefinitionParser.DecoratingFactoryBean
extends java.lang.Object
implements FactoryBean<WebSocketHandler>

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.List<WebSocketHandlerDecoratorFactory>	factories
private WebSocketHandler	handler

Constructor Summary

Constructors

Modifier	Constructor and Description
private	DecoratingFactoryBean(WebSocketHandler handler, java.util.List<WebSocketHandlerDecoratorFactory> factories)

Method Summary

Modifier and Type	Method and Description
WebSocketHandler	getObject() Return an instance (possibly shared or independent) of the object managed by this factory.
java.lang.Class<?>	getObjectType() Return the type of object that this FactoryBean creates, or null if not known in advance.
boolean	isSingleton() Is the object managed by this factory a singleton? That is, will FactoryBean.getObject() always return the same object (a reference that can be cached)?

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

handler

private final WebSocketHandler handler

factories

private final java.util.List<WebSocketHandlerDecoratorFactory> factories

Constructor Detail

DecoratingFactoryBean

private DecoratingFactoryBean(WebSocketHandler handler,
                              java.util.List<WebSocketHandlerDecoratorFactory> factories)

Method Detail

getObject

public WebSocketHandler getObject()
                           throws java.lang.Exception

Description copied from interface: FactoryBean

Return an instance (possibly shared or independent) of the object managed by this factory.

As with a BeanFactory, this allows support for both the Singleton and Prototype design pattern.

If this FactoryBean is not fully initialized yet at the time of the call (for example because it is involved in a circular reference), throw a corresponding FactoryBeanNotInitializedException.

As of Spring 2.0, FactoryBeans are allowed to return null objects. The factory will consider this as normal value to be used; it will not throw a FactoryBeanNotInitializedException in this case anymore. FactoryBean implementations are encouraged to throw FactoryBeanNotInitializedException themselves now, as appropriate.

Specified by:

getObject in interface FactoryBean<WebSocketHandler>

Returns:

an instance of the bean (can be null)

Throws:

java.lang.Exception - in case of creation errors

See Also:

FactoryBeanNotInitializedException

getObjectType

public java.lang.Class<?> getObjectType()

Description copied from interface: FactoryBean

Return the type of object that this FactoryBean creates, or null if not known in advance.

This allows one to check for specific types of beans without instantiating objects, for example on autowiring.

In the case of implementations that are creating a singleton object, this method should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.

This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.

NOTE: Autowiring will simply ignore FactoryBeans that return null here. Therefore it is highly recommended to implement this method properly, using the current state of the FactoryBean.

Specified by:

getObjectType in interface FactoryBean<WebSocketHandler>

Returns:

the type of object that this FactoryBean creates, or null if not known at the time of the call

See Also:

ListableBeanFactory.getBeansOfType(java.lang.Class<T>)

isSingleton

public boolean isSingleton()

Description copied from interface: FactoryBean

Is the object managed by this factory a singleton? That is, will FactoryBean.getObject() always return the same object (a reference that can be cached)?

NOTE: If a FactoryBean indicates to hold a singleton object, the object returned from getObject() might get cached by the owning BeanFactory. Hence, do not return true unless the FactoryBean always exposes the same reference.

The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.

NOTE: This method returning false does not necessarily indicate that returned objects are independent instances. An implementation of the extended SmartFactoryBean interface may explicitly indicate independent instances through its SmartFactoryBean.isPrototype() method. Plain FactoryBean implementations which do not implement this extended interface are simply assumed to always return independent instances if the isSingleton() implementation returns false.

Specified by:

isSingleton in interface FactoryBean<WebSocketHandler>

Returns:

whether the exposed object is a singleton

See Also:

FactoryBean.getObject(), SmartFactoryBean.isPrototype()