Module java.rmi
Package java.rmi.server

Class RMISocketFactory

java.lang.Object
java.rmi.server.RMISocketFactory
All Implemented Interfaces:
RMIClientSocketFactory, RMIServerSocketFactory
public abstract class RMISocketFactory
extends Object
implements RMIClientSocketFactory, RMIServerSocketFactory
An RMISocketFactory instance is used by the RMI runtime in order to obtain client and server sockets for RMI calls. An application may use the setSocketFactory method to request that the RMI runtime use its socket factory instance instead of the default implementation.

The default socket factory implementation creates a direct socket connection to the remote host.

The default socket factory implementation creates server sockets that are bound to the wildcard address, which accepts requests from all network interfaces.

Implementation Note:

You can use the RMISocketFactory class to create a server socket that is bound to a specific address, restricting the origin of requests. For example, the following code implements a socket factory that binds server sockets to an IPv4 loopback address. This restricts RMI to processing requests only from the local host. 


     class LoopbackSocketFactory extends RMISocketFactory {
         public ServerSocket createServerSocket(int port) throws IOException {
             return new ServerSocket(port, 5, InetAddress.getByName("127.0.0.1"));
         }

         public Socket createSocket(String host, int port) throws IOException {
             // just call the default client socket factory
             return RMISocketFactory.getDefaultSocketFactory()
                                    .createSocket(host, port);
         }
     }

     // ...

     RMISocketFactory.setSocketFactory(new LoopbackSocketFactory());
Set the java.rmi.server.hostname system property to 127.0.0.1 to ensure that the generated stubs connect to the right network interface.

Since:
1.1

  • Constructor Details

    • RMISocketFactory

      public RMISocketFactory()
      Constructs an RMISocketFactory.
      Since:
      1.1

  • Method Details

    • createSocket

      public abstract Socket createSocket​(String host, int port) throws IOException
      Creates a client socket connected to the specified host and port.
      Specified by:
      createSocket in interface RMIClientSocketFactory
      Parameters:
      host - the host name
      port - the port number
      Returns:
      a socket connected to the specified host and port.
      Throws:
      IOException - if an I/O error occurs during socket creation
      Since:
      1.1

    • createServerSocket

      public abstract ServerSocket createServerSocket​(int port) throws IOException
      Create a server socket on the specified port (port 0 indicates an anonymous port).
      Specified by:
      createServerSocket in interface RMIServerSocketFactory
      Parameters:
      port - the port number
      Returns:
      the server socket on the specified port
      Throws:
      IOException - if an I/O error occurs during server socket creation
      Since:
      1.1

    • setSocketFactory

      public static void setSocketFactory​(RMISocketFactory fac) throws IOException
      Set the global socket factory from which RMI gets sockets (if the remote object is not associated with a specific client and/or server socket factory). The RMI socket factory can only be set once. Note: The RMISocketFactory may only be set if the current security manager allows setting a socket factory; if disallowed, a SecurityException will be thrown.
      Parameters:
      fac - the socket factory
      Throws:
      IOException - if the RMI socket factory is already set
      SecurityException - if a security manager exists and its checkSetFactory method doesn't allow the operation.
      Since:
      1.1
      See Also:
      getSocketFactory(), SecurityManager.checkSetFactory()

    • getSocketFactory

      public static RMISocketFactory getSocketFactory()
      Returns the socket factory set by the setSocketFactory method. Returns null if no socket factory has been set.
      Returns:
      the socket factory
      Since:
      1.1
      See Also:
      setSocketFactory(RMISocketFactory)

    • getDefaultSocketFactory

      public static RMISocketFactory getDefaultSocketFactory()
      Returns a reference to the default socket factory used by this RMI implementation. This will be the factory used by the RMI runtime when getSocketFactory returns null.
      Returns:
      the default RMI socket factory
      Since:
      1.1

    • setFailureHandler

      public static void setFailureHandler​(RMIFailureHandler fh)
      Sets the failure handler to be called by the RMI runtime if server socket creation fails. By default, if no failure handler is installed and server socket creation fails, the RMI runtime does attempt to recreate the server socket.

      If there is a security manager, this method first calls the security manager's checkSetFactory method to ensure the operation is allowed. This could result in a SecurityException.

      Parameters:
      fh - the failure handler
      Throws:
      SecurityException - if a security manager exists and its checkSetFactory method doesn't allow the operation.
      Since:
      1.1
      See Also:
      getFailureHandler(), RMIFailureHandler.failure(Exception)

    • getFailureHandler

      public static RMIFailureHandler getFailureHandler()
      Returns the handler for socket creation failure set by the setFailureHandler method.
      Returns:
      the failure handler
      Since:
      1.1
      See Also:
      setFailureHandler(RMIFailureHandler)