https://openjdk.java.net/ 
/*
 * Copyright (c) 1996, 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package java.rmi.registry;

import java.rmi.RemoteException;
import java.rmi.server.ObjID;
import java.rmi.server.RMIClientSocketFactory;
import java.rmi.server.RMIServerSocketFactory;
import java.rmi.server.RemoteRef;
import java.rmi.server.UnicastRemoteObject;
import sun.rmi.registry.RegistryImpl;
import sun.rmi.server.UnicastRef2;
import sun.rmi.server.UnicastRef;
import sun.rmi.server.Util;
import sun.rmi.transport.LiveRef;
import sun.rmi.transport.tcp.TCPEndpoint;


LocateRegistry is used to obtain a reference to a bootstrap
remote object registry on a particular host (including the local host), or
to create a remote object registry that accepts calls on a specific port.

 Note that a getRegistry call does not actually make a
connection to the remote host.  It simply creates a local reference to
the remote registry and will succeed even if no registry is running on
the remote host.  Therefore, a subsequent method invocation to a remote
registry returned as a result of this method may fail.

Author: Ann Wollrath,  Peter Jones
See Also:
Since:  1.1
/**
 * <code>LocateRegistry</code> is used to obtain a reference to a bootstrap
 * remote object registry on a particular host (including the local host), or
 * to create a remote object registry that accepts calls on a specific port.
 *
 * <p> Note that a <code>getRegistry</code> call does not actually make a
 * connection to the remote host.  It simply creates a local reference to
 * the remote registry and will succeed even if no registry is running on
 * the remote host.  Therefore, a subsequent method invocation to a remote
 * registry returned as a result of this method may fail.
 *
 * @author  Ann Wollrath
 * @author  Peter Jones
 * @since   1.1
 * @see     java.rmi.registry.Registry
 */
public final class LocateRegistry {

    
Private constructor to disable public construction.

/**
     * Private constructor to disable public construction.
     */
    private LocateRegistry() {}

    
Returns a reference to the remote object Registry for
the local host on the default registry port of 1099.

Throws:
Returns:reference (a stub) to the remote object registry
Since:1.1
/**
     * Returns a reference to the remote object <code>Registry</code> for
     * the local host on the default registry port of 1099.
     *
     * @return reference (a stub) to the remote object registry
     * @exception RemoteException if the reference could not be created
     * @since 1.1
     */
    public static Registry getRegistry()
        throws RemoteException
    {
        return getRegistry(null, Registry.REGISTRY_PORT);
    }

    
Returns a reference to the remote object Registry for
the local host on the specified port.

Params:
  • port – port on which the registry accepts requests
Throws:
Returns:reference (a stub) to the remote object registry
Since:1.1
/**
     * Returns a reference to the remote object <code>Registry</code> for
     * the local host on the specified <code>port</code>.
     *
     * @param port port on which the registry accepts requests
     * @return reference (a stub) to the remote object registry
     * @exception RemoteException if the reference could not be created
     * @since 1.1
     */
    public static Registry getRegistry(int port)
        throws RemoteException
    {
        return getRegistry(null, port);
    }

    
Returns a reference to the remote object Registry on the
specified host on the default registry port of 1099.  If
host is null, the local host is used.

Params:
  • host – host for the remote registry
Throws:
Returns:reference (a stub) to the remote object registry
Since:1.1
/**
     * Returns a reference to the remote object <code>Registry</code> on the
     * specified <code>host</code> on the default registry port of 1099.  If
     * <code>host</code> is <code>null</code>, the local host is used.
     *
     * @param host host for the remote registry
     * @return reference (a stub) to the remote object registry
     * @exception RemoteException if the reference could not be created
     * @since 1.1
     */
    public static Registry getRegistry(String host)
        throws RemoteException
    {
        return getRegistry(host, Registry.REGISTRY_PORT);
    }

    
Returns a reference to the remote object Registry on the
specified host and port. If host
is null, the local host is used.

Params:
  • host – host for the remote registry
  • port – port on which the registry accepts requests
Throws:
Returns:reference (a stub) to the remote object registry
Since:1.1
/**
     * Returns a reference to the remote object <code>Registry</code> on the
     * specified <code>host</code> and <code>port</code>. If <code>host</code>
     * is <code>null</code>, the local host is used.
     *
     * @param host host for the remote registry
     * @param port port on which the registry accepts requests
     * @return reference (a stub) to the remote object registry
     * @exception RemoteException if the reference could not be created
     * @since 1.1
     */
    public static Registry getRegistry(String host, int port)
        throws RemoteException
    {
        return getRegistry(host, port, null);
    }

    
Returns a locally created remote reference to the remote object
Registry on the specified host and
port.  Communication with this remote registry will
use the supplied RMIClientSocketFactory csf
to create Socket connections to the registry on the
remote host and port.

Params:
  • host – host for the remote registry
  • port – port on which the registry accepts requests
  • csf –  client-side Socket factory used to
     make connections to the registry.  If csf
     is null, then the default client-side Socket
     factory will be used in the registry stub.
Throws:
Returns:reference (a stub) to the remote registry
Since:1.2
/**
     * Returns a locally created remote reference to the remote object
     * <code>Registry</code> on the specified <code>host</code> and
     * <code>port</code>.  Communication with this remote registry will
     * use the supplied <code>RMIClientSocketFactory</code> <code>csf</code>
     * to create <code>Socket</code> connections to the registry on the
     * remote <code>host</code> and <code>port</code>.
     *
     * @param host host for the remote registry
     * @param port port on which the registry accepts requests
     * @param csf  client-side <code>Socket</code> factory used to
     *      make connections to the registry.  If <code>csf</code>
     *      is null, then the default client-side <code>Socket</code>
     *      factory will be used in the registry stub.
     * @return reference (a stub) to the remote registry
     * @exception RemoteException if the reference could not be created
     * @since 1.2
     */
    public static Registry getRegistry(String host, int port,
                                       RMIClientSocketFactory csf)
        throws RemoteException
    {
        Registry registry = null;

        if (port <= 0)
            port = Registry.REGISTRY_PORT;

        if (host == null || host.length() == 0) {
            // If host is blank (as returned by "file:" URL in 1.0.2 used in
            // java.rmi.Naming), try to convert to real local host name so
            // that the RegistryImpl's checkAccess will not fail.
            try {
                host = java.net.InetAddress.getLocalHost().getHostAddress();
            } catch (Exception e) {
                // If that failed, at least try "" (localhost) anyway...
                host = "";
            }
        }

        /*
         * Create a proxy for the registry with the given host, port, and
         * client socket factory.  If the supplied client socket factory is
         * null, then the ref type is a UnicastRef, otherwise the ref type
         * is a UnicastRef2.  If the property
         * java.rmi.server.ignoreStubClasses is true, then the proxy
         * returned is an instance of a dynamic proxy class that implements
         * the Registry interface; otherwise the proxy returned is an
         * instance of the pregenerated stub class for RegistryImpl.
         **/
        LiveRef liveRef =
            new LiveRef(new ObjID(ObjID.REGISTRY_ID),
                        new TCPEndpoint(host, port, csf, null),
                        false);
        RemoteRef ref =
            (csf == null) ? new UnicastRef(liveRef) : new UnicastRef2(liveRef);

        return (Registry) Util.createProxy(RegistryImpl.class, ref, false);
    }

    
Creates and exports a Registry instance on the local
host that accepts requests on the specified port.

The Registry instance is exported as if the static 
UnicastRemoteObject.exportObject method is invoked, passing the Registry instance and the specified port as
arguments, except that the Registry instance is exported with a well-known object identifier, an ObjID instance constructed with the value ObjID.REGISTRY_ID. 
Params:
  • port – the port on which the registry accepts requests
Throws:
Returns:the registry
Since:1.1
/**
     * Creates and exports a <code>Registry</code> instance on the local
     * host that accepts requests on the specified <code>port</code>.
     *
     * <p>The <code>Registry</code> instance is exported as if the static
     * {@link UnicastRemoteObject#exportObject(Remote,int)
     * UnicastRemoteObject.exportObject} method is invoked, passing the
     * <code>Registry</code> instance and the specified <code>port</code> as
     * arguments, except that the <code>Registry</code> instance is
     * exported with a well-known object identifier, an {@link ObjID}
     * instance constructed with the value {@link ObjID#REGISTRY_ID}.
     *
     * @param port the port on which the registry accepts requests
     * @return the registry
     * @exception RemoteException if the registry could not be exported
     * @since 1.1
     **/
    public static Registry createRegistry(int port) throws RemoteException {
        return new RegistryImpl(port);
    }

    
Creates and exports a Registry instance on the local
host that uses custom socket factories for communication with that
instance.  The registry that is created listens for incoming
requests on the given port using a
ServerSocket created from the supplied
RMIServerSocketFactory.

The Registry instance is exported as if the static 
UnicastRemoteObject.exportObject method is invoked, passing the Registry instance, the specified port, the
specified RMIClientSocketFactory, and the specified
RMIServerSocketFactory as arguments, except that the
Registry instance is exported with a well-known object identifier, an ObjID instance constructed with the value ObjID.REGISTRY_ID. 
Params:
  • port – port on which the registry accepts requests
  • csf –  client-side Socket factory used to
     make connections to the registry
  • ssf –  server-side ServerSocket factory
     used to accept connections to the registry
Throws:
Returns:the registry
Since:1.2
/**
     * Creates and exports a <code>Registry</code> instance on the local
     * host that uses custom socket factories for communication with that
     * instance.  The registry that is created listens for incoming
     * requests on the given <code>port</code> using a
     * <code>ServerSocket</code> created from the supplied
     * <code>RMIServerSocketFactory</code>.
     *
     * <p>The <code>Registry</code> instance is exported as if
     * the static {@link
     * UnicastRemoteObject#exportObject(Remote,int,RMIClientSocketFactory,RMIServerSocketFactory)
     * UnicastRemoteObject.exportObject} method is invoked, passing the
     * <code>Registry</code> instance, the specified <code>port</code>, the
     * specified <code>RMIClientSocketFactory</code>, and the specified
     * <code>RMIServerSocketFactory</code> as arguments, except that the
     * <code>Registry</code> instance is exported with a well-known object
     * identifier, an {@link ObjID} instance constructed with the value
     * {@link ObjID#REGISTRY_ID}.
     *
     * @param port port on which the registry accepts requests
     * @param csf  client-side <code>Socket</code> factory used to
     *      make connections to the registry
     * @param ssf  server-side <code>ServerSocket</code> factory
     *      used to accept connections to the registry
     * @return the registry
     * @exception RemoteException if the registry could not be exported
     * @since 1.2
     **/
    public static Registry createRegistry(int port,
                                          RMIClientSocketFactory csf,
                                          RMIServerSocketFactory ssf)
        throws RemoteException
    {
        return new RegistryImpl(port, csf, ssf);
    }
}