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

    Methods
    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`