org.springframework.jndi
Class JndiObjectFactoryBean

java.lang.Object
  org.springframework.jndi.JndiAccessor
      org.springframework.jndi.JndiLocatorSupport
          org.springframework.jndi.JndiObjectLocator
              org.springframework.jndi.JndiObjectFactoryBean

All Implemented Interfaces:

FactoryBean, InitializingBean

public class JndiObjectFactoryBean

extends JndiObjectLocator

implements FactoryBean

FactoryBean that looks up a JNDI object. Behaves like the object when used as bean reference, e.g. for JdbcTemplate's dataSource property.

The typical usage will be to register this as singleton factory (e.g. for a certain JNDI DataSource) in an application context, and give bean references to application services that need it.

Assumptions: The resource obtained from JNDI is available at context startup time and can be cached. If this is not the case, consider using a ProxyFactoryBean with JndiObjectTargetSource, which fetches objects from JNDI on demand.

Of course, service implementations can lookup e.g. a DataSource from JNDI themselves, but this class enables central configuration of the JNDI name, and easy switching to non-JNDI replacements. The latter can be used for test setups, standalone clients, etc.

Note that switching to e.g. DriverManagerDataSource is just a matter of configuration: replace the definition of this FactoryBean with a DriverManagerDataSource definition!

Since:

22.05.2003

Author:

Juergen Hoeller

See Also:

JndiObjectTargetSource, JdbcAccessor.setDataSource(javax.sql.DataSource)

Field Summary

Fields inherited from class org.springframework.jndi.JndiLocatorSupport

CONTAINER_PREFIX

Fields inherited from class org.springframework.jndi.JndiAccessor

logger

Constructor Summary

JndiObjectFactoryBean()

Method Summary

void	afterPropertiesSet() Look up the JNDI object and store it.
Object	getObject() Return the singleton JNDI object.
Class	getObjectType() Return the type of object that this FactoryBean creates, or null if not known in advance.
boolean	isSingleton() Is the bean managed by this factory a singleton or a prototype?

Methods inherited from class org.springframework.jndi.JndiObjectLocator

getJndiName, lookup, setJndiName

Methods inherited from class org.springframework.jndi.JndiLocatorSupport

convertJndiName, isResourceRef, lookup, setResourceRef

Methods inherited from class org.springframework.jndi.JndiAccessor

getJndiEnvironment, getJndiTemplate, setJndiEnvironment, setJndiTemplate

Methods inherited from class java.lang.Object

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

Constructor Detail

JndiObjectFactoryBean

public JndiObjectFactoryBean()

Method Detail

afterPropertiesSet

public void afterPropertiesSet()
                        throws NamingException

Look up the JNDI object and store it.

Specified by:

afterPropertiesSet in interface InitializingBean

Overrides:

afterPropertiesSet in class JndiObjectLocator

Throws:

NamingException

See Also:

JndiObjectLocator.lookup()

getObject

public Object getObject()

Return the singleton JNDI object.

Specified by:

getObject in interface FactoryBean

Returns:

an instance of the bean (should never be null)

getObjectType

public 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 to check for specific types of beans without instantiating objects, for example on autowiring.

For a singleton, this 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

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)

isSingleton

public boolean isSingleton()

Description copied from interface: FactoryBean

Is the bean managed by this factory a singleton or a prototype? That is, will getObject() always return the same object?

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

Specified by:

isSingleton in interface FactoryBean

Returns:

if this bean is a singleton