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java.lang.Object org.springframework.jndi.JndiAccessor org.springframework.jndi.JndiLocatorSupport org.springframework.jndi.JndiObjectLocator org.springframework.ejb.access.AbstractSlsbInvokerInterceptor org.springframework.ejb.access.LocalSlsbInvokerInterceptor org.springframework.ejb.access.LocalStatelessSessionProxyFactoryBean
public class LocalStatelessSessionProxyFactoryBean
Convenient FactoryBean
for local Stateless Session Bean (SLSB) proxies.
Designed for EJB 2.x, but works for EJB 3 Session Beans as well.
See JndiObjectLocator
for info on
how to specify the JNDI location of the target EJB.
If you want control over interceptor chaining, use an AOP ProxyFactoryBean with LocalSlsbInvokerInterceptor rather than rely on this class.
In a bean container, this class is normally best used as a singleton. However, if that bean container pre-instantiates singletons (as do the XML ApplicationContext variants) you may have a problem if the bean container is loaded before the EJB container loads the target EJB. That is because by default the JNDI lookup will be performed in the init method of this class and cached, but the EJB will not have been bound at the target location yet. The best solution is to set the "lookupHomeOnStartup" property to "false", in which case the home will be fetched on first access to the EJB. (This flag is only true by default for backwards compatibility reasons).
AbstractSlsbInvokerInterceptor.setLookupHomeOnStartup(boolean)
,
AbstractSlsbInvokerInterceptor.setCacheHome(boolean)
Field Summary |
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Fields inherited from class org.springframework.jndi.JndiLocatorSupport |
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CONTAINER_PREFIX |
Fields inherited from class org.springframework.jndi.JndiAccessor |
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logger |
Constructor Summary | |
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LocalStatelessSessionProxyFactoryBean()
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Method Summary | |
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void |
afterPropertiesSet()
Fetches EJB home on startup, if necessary. |
Class |
getBusinessInterface()
Return the business interface of the EJB we're proxying. |
Object |
getObject()
Return an instance (possibly shared or independent) of the object managed by this factory. |
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)? |
void |
setBeanClassLoader(ClassLoader classLoader)
Callback that supplies the bean class loader to
a bean instance. |
void |
setBusinessInterface(Class businessInterface)
Set the business interface of the EJB we're proxying. |
Methods inherited from class org.springframework.ejb.access.LocalSlsbInvokerInterceptor |
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getCreateMethod, getSessionBeanInstance, invokeInContext, newSessionBeanInstance, releaseSessionBeanInstance, removeSessionBeanInstance |
Methods inherited from class org.springframework.ejb.access.AbstractSlsbInvokerInterceptor |
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create, getHome, invoke, isHomeRefreshable, refreshHome, setCacheHome, setExposeAccessContext, setLookupHomeOnStartup |
Methods inherited from class org.springframework.jndi.JndiObjectLocator |
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getExpectedType, getJndiName, lookup, setExpectedType, setJndiName |
Methods inherited from class org.springframework.jndi.JndiLocatorSupport |
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convertJndiName, isResourceRef, lookup, lookup, setResourceRef |
Methods inherited from class org.springframework.jndi.JndiAccessor |
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getJndiEnvironment, getJndiTemplate, setJndiEnvironment, setJndiTemplate |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public LocalStatelessSessionProxyFactoryBean()
Method Detail |
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public void setBusinessInterface(Class businessInterface)
businessInterface
- set the business interface of the EJBpublic Class getBusinessInterface()
public void setBeanClassLoader(ClassLoader classLoader)
BeanClassLoaderAware
class loader
to
a bean instance.
Invoked after the population of normal bean properties but
before an initialization callback such as
InitializingBean's
InitializingBean.afterPropertiesSet()
method or a custom init-method.
setBeanClassLoader
in interface BeanClassLoaderAware
classLoader
- the owning class loader; may be null
in
which case a default ClassLoader
must be used, for example
the ClassLoader
obtained via
ClassUtils.getDefaultClassLoader()
public void afterPropertiesSet() throws NamingException
AbstractSlsbInvokerInterceptor
afterPropertiesSet
in interface InitializingBean
afterPropertiesSet
in class AbstractSlsbInvokerInterceptor
NamingException
AbstractSlsbInvokerInterceptor.setLookupHomeOnStartup(boolean)
,
AbstractSlsbInvokerInterceptor.refreshHome()
public Object getObject()
FactoryBean
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.
getObject
in interface FactoryBean<Object>
null
)FactoryBeanNotInitializedException
public Class<?> getObjectType()
FactoryBean
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.
getObjectType
in interface FactoryBean<Object>
null
if not known at the time of the callListableBeanFactory.getBeansOfType(java.lang.Class)
public boolean isSingleton()
FactoryBean
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
.
isSingleton
in interface FactoryBean<Object>
FactoryBean.getObject()
,
SmartFactoryBean.isPrototype()
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