org.apache.wicket.spring.injection.annot

Class AnnotProxyFieldValueFactory

java.lang.Object

org.apache.wicket.spring.injection.annot.AnnotProxyFieldValueFactory

All Implemented Interfaces:

IFieldValueFactory

public class AnnotProxyFieldValueFactory
extends Object
implements IFieldValueFactory

IFieldValueFactory that uses LazyInitProxyFactory to create proxies for Spring dependencies based on the SpringBean annotation applied to a field. This class is usually used by the SpringComponentInjector to inject objects with lazy init proxies. However, this class can be used on its own to create proxies for any field decorated with a SpringBean annotation.

Example:

 IFieldValueFactory factory = new AnnotProxyFieldValueFactory(contextLocator);
 field = obj.getClass().getDeclaredField("dependency");
 IDependency dependency = (IDependency)factory.getFieldValue(field, obj);
 

In the example above the dependency object returned is a lazy init proxy that will look up the actual IDependency bean from spring context upon first access to one of the methods.

This class will also cache any produced proxies so that the same proxy is always returned for the same spring dependency. This helps cut down on session size beacause proxies for the same dependency will not be serialized twice.

Author:

Igor Vaynberg (ivaynberg), Istvan Devai, Tobias Soloschenko

See Also:

LazyInitProxyFactory, SpringBean, SpringBeanLocator, Inject

Constructor Summary

Constructors

Constructor and Description
AnnotProxyFieldValueFactory(ISpringContextLocator contextLocator)
AnnotProxyFieldValueFactory(ISpringContextLocator contextLocator, boolean wrapInProxies)

Method Summary

Modifier and Type	Method and Description
org.springframework.beans.factory.config.BeanDefinition	getBeanDefinition(org.springframework.beans.factory.config.ConfigurableListableBeanFactory beanFactory, String name)
Object	getFieldValue(Field field, Object fieldOwner) Returns the value the field will be set to
boolean	supportsField(Field field) Returns true if the factory can generate a value for the field, false otherwise.

Methods inherited from class java.lang.Object

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

Constructor Detail

AnnotProxyFieldValueFactory

public AnnotProxyFieldValueFactory(ISpringContextLocator contextLocator)

Parameters:

contextLocator - spring context locator

AnnotProxyFieldValueFactory

public AnnotProxyFieldValueFactory(ISpringContextLocator contextLocator,
                                   boolean wrapInProxies)

Parameters:

contextLocator - spring context locator

wrapInProxies - whether or not wicket should wrap dependencies with specialized proxies that can be safely serialized. in most cases this should be set to true.

Method Detail

getFieldValue

public Object getFieldValue(Field field,
                            Object fieldOwner)

Description copied from interface: IFieldValueFactory

Returns the value the field will be set to

Specified by:

getFieldValue in interface IFieldValueFactory

Parameters:

field - field being injected

fieldOwner - instance of object being injected

Returns:

new field value

getBeanDefinition

public org.springframework.beans.factory.config.BeanDefinition getBeanDefinition(org.springframework.beans.factory.config.ConfigurableListableBeanFactory beanFactory,
                                                                                 String name)

supportsField

public boolean supportsField(Field field)

Description copied from interface: IFieldValueFactory

Returns true if the factory can generate a value for the field, false otherwise. If this method returns false, getFieldValue() will not be called on this factory

Specified by:

supportsField in interface IFieldValueFactory

Parameters:

field - field

Returns:

true if the factory can generate a value for the field, false otherwise