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java.lang.Object org.springframework.jndi.JndiAccessor org.springframework.jndi.JndiLocatorSupport org.springframework.jndi.JndiObjectLocator org.springframework.jndi.JndiObjectFactoryBean
public class JndiObjectFactoryBean
FactoryBean
that looks up a
JNDI object. Exposes the object found in JNDI for bean references,
e.g. for data access object's "dataSource" property in case of a
DataSource
.
The typical usage will be to register this as singleton factory (e.g. for a certain JNDI-bound DataSource) in an application context, and give bean references to application services that need it.
The default behavior is to look up the JNDI object on startup and cache it.
This can be customized through the "lookupOnStartup" and "cache" properties,
using a JndiObjectTargetSource
underneath. Note that you need to specify
a "proxyInterface" in such a scenario, since the actual JNDI object type is not
known in advance.
Of course, bean classes in a Spring environment may lookup e.g. a DataSource from JNDI themselves. This class simply enables central configuration of the JNDI name, and easy switching to non-JNDI alternatives. The latter is particularly convenient for test setups, reuse in standalone clients, etc.
Note that switching to e.g. DriverManagerDataSource is just a matter of
configuration: Simply replace the definition of this FactoryBean with a
DriverManagerDataSource
definition!
setProxyInterface(java.lang.Class)
,
setLookupOnStartup(boolean)
,
setCache(boolean)
,
JndiObjectTargetSource
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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JndiObjectFactoryBean()
|
Method Summary | |
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void |
afterPropertiesSet()
Look up the JNDI object and store it. |
protected Class |
createCompositeInterface(Class[] interfaces)
Create a composite interface Class for the given interfaces, implementing the given interfaces in one single Class. |
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 object managed by this factory a singleton? |
protected Object |
lookupWithFallback()
Lookup variant that that returns the specified "defaultObject" (if any) in case of lookup failure. |
void |
setBeanClassLoader(ClassLoader classLoader)
Callback that supplies the bean class loader to
a bean instance. |
void |
setCache(boolean cache)
Set whether to cache the JNDI object once it has been located. |
void |
setDefaultObject(Object defaultObject)
Specify a default object to fall back to if the JNDI lookup fails. |
void |
setLookupOnStartup(boolean lookupOnStartup)
Set whether to look up the JNDI object on startup. |
void |
setProxyInterface(Class proxyInterface)
Specify the proxy interface to use for the JNDI object. |
void |
setProxyInterfaces(Class[] proxyInterfaces)
Specify multiple proxy interfaces to use for the JNDI object. |
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 JndiObjectFactoryBean()
Method Detail |
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public void setProxyInterface(Class proxyInterface)
Typically used in conjunction with "lookupOnStartup"=false and/or "cache"=false. Needs to be specified because the actual JNDI object type is not known in advance in case of a lazy lookup.
public void setProxyInterfaces(Class[] proxyInterfaces)
Typically used in conjunction with "lookupOnStartup"=false and/or "cache"=false. Note that proxy interfaces will be autodetected from a specified "expectedType", if necessary.
public void setLookupOnStartup(boolean lookupOnStartup)
Can be turned off to allow for late availability of the JNDI object. In this case, the JNDI object will be fetched on first access.
For a lazy lookup, a proxy interface needs to be specified.
public void setCache(boolean cache)
Can be turned off to allow for hot redeployment of JNDI objects. In this case, the JNDI object will be fetched for each invocation.
For hot redeployment, a proxy interface needs to be specified.
public void setDefaultObject(Object defaultObject)
This can be an arbitrary bean reference or literal value. It is typically used for literal values in scenarios where the JNDI environment might define specific config settings but those are not required to be present.
Note: This is only supported for lookup on startup.
setLookupOnStartup(boolean)
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 IllegalArgumentException, NamingException
afterPropertiesSet
in interface InitializingBean
afterPropertiesSet
in class JndiObjectLocator
protected Object lookupWithFallback() throws NamingException
NamingException
- in case of lookup failure without fallbacksetDefaultObject(java.lang.Object)
public Object getObject()
getObject
in interface FactoryBean
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
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
FactoryBean.getObject()
,
SmartFactoryBean.isPrototype()
protected Class createCompositeInterface(Class[] interfaces)
The default implementation builds a JDK proxy class for the given interfaces.
interfaces
- the interfaces to merge
Proxy.getProxyClass(java.lang.ClassLoader, java.lang.Class>...)
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