compact2, compact3

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 performs a three-tiered approach to creating client sockets. First, a direct socket connection to the remote VM is attempted. If that fails (due to a firewall), the runtime uses HTTP with the explicit port number of the server. If the firewall does not allow this type of communication, then HTTP to a cgi-bin script on the server is used to POST the RMI call. The HTTP tunneling mechanisms are disabled by default. This behavior is controlled by the java.rmi.server.disableHttp property, whose default value is true. Setting this property's value to false will enable the HTTP tunneling mechanisms.

Deprecated: HTTP Tunneling. The HTTP tunneling mechanisms described above, specifically HTTP with an explicit port and HTTP to a cgi-bin script, are deprecated. These HTTP tunneling mechanisms are subject to removal in a future release of the platform.

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:

JDK1.1

Constructor Summary

Constructors

Constructor and Description
RMISocketFactory() Constructs an RMISocketFactory.

Method Summary

Modifier and Type	Method and Description
abstract ServerSocket	createServerSocket(int port) Create a server socket on the specified port (port 0 indicates an anonymous port).
abstract Socket	createSocket(String host, int port) Creates a client socket connected to the specified host and port.
static RMISocketFactory	getDefaultSocketFactory() Returns a reference to the default socket factory used by this RMI implementation.
static RMIFailureHandler	getFailureHandler() Returns the handler for socket creation failure set by the setFailureHandler method.
static RMISocketFactory	getSocketFactory() Returns the socket factory set by the setSocketFactory method.
static void	setFailureHandler(RMIFailureHandler fh) Sets the failure handler to be called by the RMI runtime if server socket creation fails.
static void	setSocketFactory(RMISocketFactory fac) 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).

Methods inherited from class java.lang.Object

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

Constructor Detail

RMISocketFactory

public RMISocketFactory()

Constructs an RMISocketFactory.

Since:

JDK1.1

Method Detail

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:

JDK1.1

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:

JDK1.1

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:

JDK1.1

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:

JDK1.1

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:

JDK1.1

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:

JDK1.1

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:

JDK1.1

See Also:

setFailureHandler(RMIFailureHandler)