org.springframework.remoting.rmi

Class RmiRegistryFactoryBean

java.lang.Object

org.springframework.remoting.rmi.RmiRegistryFactoryBean

All Implemented Interfaces:

DisposableBean, FactoryBean<Registry>, InitializingBean

public class RmiRegistryFactoryBean
extends Object
implements FactoryBean<Registry>, InitializingBean, DisposableBean

FactoryBean that locates a Registry and exposes it for bean references. Can also create a local RMI registry on the fly if none exists already.

Can be used to set up and pass around the actual Registry object to applications objects that need to work with RMI. One example for such an object that needs to work with RMI is Spring's RmiServiceExporter, which either works with a passed-in Registry reference or falls back to the registry as specified by its local properties and defaults.

Also useful to enforce creation of a local RMI registry at a given port, for example for a JMX connector. If used in conjunction with ConnectorServerFactoryBean, it is recommended to mark the connector definition (ConnectorServerFactoryBean) as "depends-on" the registry definition (RmiRegistryFactoryBean), to guarantee starting up the registry first.

Note: The implementation of this class mirrors the corresponding logic in RmiServiceExporter, and also offers the same customization hooks. RmiServiceExporter implements its own registry lookup as a convenience: It is very common to simply rely on the registry defaults.

Since:

1.2.3

Author:

Juergen Hoeller

See Also:

RmiServiceExporter.setRegistry(java.rmi.registry.Registry), ConnectorServerFactoryBean, Registry, LocateRegistry

Field Summary

Fields

Modifier and Type	Field and Description
protected Log	logger

Constructor Summary

Constructors

Constructor and Description
RmiRegistryFactoryBean()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
void	destroy() Unexport the RMI registry on bean factory shutdown, provided that this bean actually created a registry.
String	getHost() Return the host of the registry for the exported RMI service.
Registry	getObject() Return an instance (possibly shared or independent) of the object managed by this factory.
Class<? extends Registry>	getObjectType() Return the type of object that this FactoryBean creates, or null if not known in advance.
int	getPort() Return the port of the registry for the exported RMI service.
protected Registry	getRegistry(int registryPort) Locate or create the RMI registry.
protected Registry	getRegistry(int registryPort, RMIClientSocketFactory clientSocketFactory, RMIServerSocketFactory serverSocketFactory) Locate or create the RMI registry.
protected Registry	getRegistry(String registryHost, int registryPort, RMIClientSocketFactory clientSocketFactory, RMIServerSocketFactory serverSocketFactory) Locate or create the RMI registry.
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	setAlwaysCreate(boolean alwaysCreate) Set whether to always create the registry in-process, not attempting to locate an existing registry at the specified port.
void	setClientSocketFactory(RMIClientSocketFactory clientSocketFactory) Set a custom RMI client socket factory to use for the RMI registry.
void	setHost(String host) Set the host of the registry for the exported RMI service, i.e.
void	setPort(int port) Set the port of the registry for the exported RMI service, i.e.
void	setServerSocketFactory(RMIServerSocketFactory serverSocketFactory) Set a custom RMI server socket factory to use for the RMI registry.
protected void	testRegistry(Registry registry) Test the given RMI registry, calling some operation on it to check whether it is still active.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final Log logger

Constructor Detail

RmiRegistryFactoryBean

public RmiRegistryFactoryBean()

Method Detail

setHost

public void setHost(String host)

Set the host of the registry for the exported RMI service, i.e. rmi://HOST:port/name

Default is localhost.

getHost

public String getHost()

Return the host of the registry for the exported RMI service.

setPort

public void setPort(int port)

Set the port of the registry for the exported RMI service, i.e. rmi://host:PORT/name

Default is Registry.REGISTRY_PORT (1099).

getPort

public int getPort()

Return the port of the registry for the exported RMI service.

setClientSocketFactory

public void setClientSocketFactory(RMIClientSocketFactory clientSocketFactory)

Set a custom RMI client socket factory to use for the RMI registry.

If the given object also implements java.rmi.server.RMIServerSocketFactory, it will automatically be registered as server socket factory too.

See Also:

setServerSocketFactory(java.rmi.server.RMIServerSocketFactory), RMIClientSocketFactory, RMIServerSocketFactory, LocateRegistry.getRegistry(String, int, java.rmi.server.RMIClientSocketFactory)

setServerSocketFactory

public void setServerSocketFactory(RMIServerSocketFactory serverSocketFactory)

Set a custom RMI server socket factory to use for the RMI registry.

Only needs to be specified when the client socket factory does not implement java.rmi.server.RMIServerSocketFactory already.

See Also:

setClientSocketFactory(java.rmi.server.RMIClientSocketFactory), RMIClientSocketFactory, RMIServerSocketFactory, LocateRegistry.createRegistry(int, RMIClientSocketFactory, java.rmi.server.RMIServerSocketFactory)

setAlwaysCreate

public void setAlwaysCreate(boolean alwaysCreate)

Set whether to always create the registry in-process, not attempting to locate an existing registry at the specified port.

Default is "false". Switch this flag to "true" in order to avoid the overhead of locating an existing registry when you always intend to create a new registry in any case.

afterPropertiesSet

public void afterPropertiesSet()
                        throws Exception

Description copied from interface: InitializingBean

Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

This method allows the bean instance to perform initialization only possible when all bean properties have been set and to throw an exception in the event of misconfiguration.

Specified by:

afterPropertiesSet in interface InitializingBean

Throws:

Exception - in the event of misconfiguration (such as failure to set an essential property) or if initialization fails.

getRegistry

protected Registry getRegistry(String registryHost,
                               int registryPort,
                               RMIClientSocketFactory clientSocketFactory,
                               RMIServerSocketFactory serverSocketFactory)
                        throws RemoteException

Locate or create the RMI registry.

Parameters:

registryHost - the registry host to use (if this is specified, no implicit creation of a RMI registry will happen)

registryPort - the registry port to use

clientSocketFactory - the RMI client socket factory for the registry (if any)

serverSocketFactory - the RMI server socket factory for the registry (if any)

Returns:

the RMI registry

Throws:

RemoteException - if the registry couldn't be located or created

getRegistry

protected Registry getRegistry(int registryPort,
                               RMIClientSocketFactory clientSocketFactory,
                               RMIServerSocketFactory serverSocketFactory)
                        throws RemoteException

Locate or create the RMI registry.

Parameters:

registryPort - the registry port to use

clientSocketFactory - the RMI client socket factory for the registry (if any)

serverSocketFactory - the RMI server socket factory for the registry (if any)

Returns:

the RMI registry

Throws:

RemoteException - if the registry couldn't be located or created

getRegistry

protected Registry getRegistry(int registryPort)
                        throws RemoteException

Locate or create the RMI registry.

Parameters:

registryPort - the registry port to use

Returns:

the RMI registry

Throws:

RemoteException - if the registry couldn't be located or created

testRegistry

protected void testRegistry(Registry registry)
                     throws RemoteException

Test the given RMI registry, calling some operation on it to check whether it is still active.

Default implementation calls Registry.list().

Parameters:

registry - the RMI registry to test

Throws:

RemoteException - if thrown by registry methods

See Also:

Registry.list()

getObject

public Registry getObject()
                   throws 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<Registry>

Returns:

an instance of the bean (can be null)

Throws:

Exception - in case of creation errors

See Also:

FactoryBeanNotInitializedException

getObjectType

public Class<? extends Registry> 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<Registry>

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<Registry>

Returns:

whether the exposed object is a singleton

See Also:

FactoryBean.getObject(), SmartFactoryBean.isPrototype()

destroy

public void destroy()
             throws RemoteException

Unexport the RMI registry on bean factory shutdown, provided that this bean actually created a registry.

Specified by:

destroy in interface DisposableBean

Throws:

RemoteException