org.springframework.remoting.rmi

## Class RmiServiceExporter

- java.lang.Object
- - org.springframework.remoting.support.RemotingSupport
  - - org.springframework.remoting.support.RemoteExporter
    - - org.springframework.remoting.support.RemoteInvocationBasedExporter
      - - org.springframework.remoting.rmi.RmiBasedExporter
        - - org.springframework.remoting.rmi.RmiServiceExporter

- All Implemented Interfaces:
    Aware, BeanClassLoaderAware, DisposableBean, InitializingBean

      public class RmiServiceExporter
      extends RmiBasedExporter
      implements InitializingBean, DisposableBean

  RMI exporter that exposes the specified service as RMI object with the specified name. Such services can be accessed via plain RMI or via `RmiProxyFactoryBean`. Also supports exposing any non-RMI service via RMI invokers, to be accessed via `RmiClientInterceptor` / `RmiProxyFactoryBean`'s automatic detection of such invokers.

  With an RMI invoker, RMI communication works on the `RmiInvocationHandler` level, needing only one stub for any service. Service interfaces do not have to extend `java.rmi.Remote` or throw `java.rmi.RemoteException` on all methods, but in and out parameters have to be serializable.

  The major advantage of RMI, compared to Hessian and Burlap, is serialization. Effectively, any serializable Java object can be transported without hassle. Hessian and Burlap have their own (de-)serialization mechanisms, but are HTTP-based and thus much easier to setup than RMI. Alternatively, consider Spring's HTTP invoker to combine Java serialization with HTTP-based transport.

  Note: RMI makes a best-effort attempt to obtain the fully qualified host name. If one cannot be determined, it will fall back and use the IP address. Depending on your network configuration, in some cases it will resolve the IP to the loopback address. To ensure that RMI will use the host name bound to the correct network interface, you should pass the `java.rmi.server.hostname` property to the JVM that will export the registry and/or the service using the "-D" JVM argument. For example: `-Djava.rmi.server.hostname=myserver.com`

  Since:
    13.05.2003
  Author:
    Juergen Hoeller
  See Also:
    `RmiClientInterceptor`, `RmiProxyFactoryBean`, `Remote`, `RemoteException`, `HessianServiceExporter`, `BurlapServiceExporter`, `HttpInvokerServiceExporter`

- - ### Field Summary

    - ### Fields inherited from class org.springframework.remoting.support.RemotingSupport

      `logger`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `RmiServiceExporter()`

  - ### Method Summary

    All Methods Instance Methods Concrete 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()` Unbind the RMI service from the registry on bean factory shutdown.
    `protected Registry` | `getRegistry(int registryPort)` Locate or create the RMI registry for this exporter.
    `protected Registry` | `getRegistry(int registryPort, RMIClientSocketFactory clientSocketFactory, RMIServerSocketFactory serverSocketFactory)` Locate or create the RMI registry for this exporter.
    `protected Registry` | `getRegistry(String registryHost, int registryPort, RMIClientSocketFactory clientSocketFactory, RMIServerSocketFactory serverSocketFactory)` Locate or create the RMI registry for this exporter.
    `void` | `prepare()` Initialize this service exporter, registering the service as RMI object.
    `void` | `setAlwaysCreateRegistry(boolean alwaysCreateRegistry)` 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 exporting the service.
    `void` | `setRegistry(Registry registry)` Specify the RMI registry to register the exported service with.
    `void` | `setRegistryClientSocketFactory(RMIClientSocketFactory registryClientSocketFactory)` Set a custom RMI client socket factory to use for the RMI registry.
    `void` | `setRegistryHost(String registryHost)` Set the host of the registry for the exported RMI service, i.e.
    `void` | `setRegistryPort(int registryPort)` Set the port of the registry for the exported RMI service, i.e.
    `void` | `setRegistryServerSocketFactory(RMIServerSocketFactory registryServerSocketFactory)` Set a custom RMI server socket factory to use for the RMI registry.
    `void` | `setReplaceExistingBinding(boolean replaceExistingBinding)` Set whether to replace an existing binding in the RMI registry, that is, whether to simply override an existing binding with the specified service in case of a naming conflict in the registry.
    `void` | `setServerSocketFactory(RMIServerSocketFactory serverSocketFactory)` Set a custom RMI server socket factory to use for exporting the service.
    `void` | `setServiceName(String serviceName)` Set the name of the exported RMI service, i.e.
    `void` | `setServicePort(int servicePort)` Set the port that the exported RMI service will use.
    `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 org.springframework.remoting.rmi.RmiBasedExporter

      `getObjectToExport, invoke`

    - ### Methods inherited from class org.springframework.remoting.support.RemoteInvocationBasedExporter

      `getRemoteInvocationExecutor, invokeAndCreateResult, setRemoteInvocationExecutor`

    - ### Methods inherited from class org.springframework.remoting.support.RemoteExporter

      `checkService, checkServiceInterface, getExporterName, getProxyForService, getService, getServiceInterface, setInterceptors, setRegisterTraceInterceptor, setService, setServiceInterface`

    - ### Methods inherited from class org.springframework.remoting.support.RemotingSupport

      `getBeanClassLoader, overrideThreadContextClassLoader, resetThreadContextClassLoader, setBeanClassLoader`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### RmiServiceExporter

          public RmiServiceExporter()

  - ### Method Detail

    - #### setServiceName

          public void setServiceName(String serviceName)

      Set the name of the exported RMI service, i.e. `rmi://host:port/NAME`

    - #### setServicePort

          public void setServicePort(int servicePort)

      Set the port that the exported RMI service will use.

      Default is 0 (anonymous port).

    - #### setClientSocketFactory

          public void setClientSocketFactory(RMIClientSocketFactory clientSocketFactory)

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

      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`, `UnicastRemoteObject.exportObject(Remote, int, RMIClientSocketFactory, RMIServerSocketFactory)`

    - #### setServerSocketFactory

          public void setServerSocketFactory(RMIServerSocketFactory serverSocketFactory)

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

      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`, `UnicastRemoteObject.exportObject(Remote, int, RMIClientSocketFactory, RMIServerSocketFactory)`

    - #### setRegistry

          public void setRegistry(Registry registry)

      Specify the RMI registry to register the exported service with. Typically used in combination with RmiRegistryFactoryBean.

      Alternatively, you can specify all registry properties locally. This exporter will then try to locate the specified registry, automatically creating a new local one if appropriate.

      Default is a local registry at the default port (1099), created on the fly if necessary.

      See Also:
        `RmiRegistryFactoryBean`, `setRegistryHost(java.lang.String)`, `setRegistryPort(int)`, `setRegistryClientSocketFactory(java.rmi.server.RMIClientSocketFactory)`, `setRegistryServerSocketFactory(java.rmi.server.RMIServerSocketFactory)`

    - #### setRegistryHost

          public void setRegistryHost(String registryHost)

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

      Default is localhost.

    - #### setRegistryPort

          public void setRegistryPort(int registryPort)

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

      Default is `Registry.REGISTRY_PORT` (1099).

      See Also:
        `Registry.REGISTRY_PORT`

    - #### setRegistryClientSocketFactory

          public void setRegistryClientSocketFactory(RMIClientSocketFactory registryClientSocketFactory)

      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:
        `setRegistryServerSocketFactory(java.rmi.server.RMIServerSocketFactory)`, `RMIClientSocketFactory`, `RMIServerSocketFactory`, `LocateRegistry.getRegistry(String, int, RMIClientSocketFactory)`

    - #### setRegistryServerSocketFactory

          public void setRegistryServerSocketFactory(RMIServerSocketFactory registryServerSocketFactory)

      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:
        `setRegistryClientSocketFactory(java.rmi.server.RMIClientSocketFactory)`, `RMIClientSocketFactory`, `RMIServerSocketFactory`, `LocateRegistry.createRegistry(int, RMIClientSocketFactory, RMIServerSocketFactory)`

    - #### setAlwaysCreateRegistry

          public void setAlwaysCreateRegistry(boolean alwaysCreateRegistry)

      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.

    - #### setReplaceExistingBinding

          public void setReplaceExistingBinding(boolean replaceExistingBinding)

      Set whether to replace an existing binding in the RMI registry, that is, whether to simply override an existing binding with the specified service in case of a naming conflict in the registry.

      Default is "true", assuming that an existing binding for this exporter's service name is an accidental leftover from a previous execution. Switch this to "false" to make the exporter fail in such a scenario, indicating that there was already an RMI object bound.

    - #### afterPropertiesSet

          public void afterPropertiesSet()
                                  throws RemoteException

      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:
        `RemoteException`

    - #### prepare

          public void prepare()
                       throws RemoteException

      Initialize this service exporter, registering the service as RMI object.

      Creates an RMI registry on the specified port if none exists.

      Throws:
        `RemoteException` - if service registration failed

    - #### getRegistry

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

      Locate or create the RMI registry for this exporter.
      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 for this exporter.
      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 for this exporter.
      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()`

    - #### destroy

          public void destroy()
                       throws RemoteException

      Unbind the RMI service from the registry on bean factory shutdown.
      Specified by:
        `destroy` in interface `DisposableBean`
      Throws:
        `RemoteException`