src/java.rmi/share/classes/java/rmi/server/RMIClientSocketFactory.java

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package java.rmi.server;

import java.io.*;
import java.net.*;

/**
 * An <code>RMIClientSocketFactory</code> instance is used by the RMI runtime
 * in order to obtain client sockets for RMI calls.  A remote object can be
 * associated with an <code>RMIClientSocketFactory</code> when it is
 * created/exported via the constructors or <code>exportObject</code> methods
 * of <code>java.rmi.server.UnicastRemoteObject</code>.
 *
 * <p>An <code>RMIClientSocketFactory</code> instance associated with a remote
 * object will be downloaded to clients when the remote object's reference is
 * transmitted in an RMI call.  This <code>RMIClientSocketFactory</code> will
 * be used to create connections to the remote object for remote method calls.
 *
 * <p>An <code>RMIClientSocketFactory</code> instance can also be associated
 * with a remote object registry so that clients can use custom socket
 * communication with a remote object registry.
 *
 * <p>An implementation of this interface should be serializable and
 * should implement {@link Object#equals} to return <code>true</code> when
 * passed an instance that represents the same (functionally equivalent)
 * client socket factory, and <code>false</code> otherwise (and it should also
 * implement {@link Object#hashCode} consistently with its
 * <code>Object.equals</code> implementation).
 *
 * @author  Ann Wollrath
 * @author  Peter Jones
 * @since   1.2
 * @see     java.rmi.server.UnicastRemoteObject
 * @see     java.rmi.registry.LocateRegistry
 */
public interface RMIClientSocketFactory {

    /**
     * Create a client socket connected to the specified host and port.
     * @param  host   the host name
     * @param  port   the port number
     * @return a socket connected to the specified host and port.
     * @throws IOException if an I/O error occurs during socket creation
     * @since 1.2
     */
    public Socket createSocket(String host, int port)
        throws IOException;
}