221 lines
7.1 KiB
Java
221 lines
7.1 KiB
Java
/* Naming.java --
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Copyright (c) 1996, 1997, 1998, 1999, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.rmi;
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import java.net.MalformedURLException;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.net.URL;
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import java.rmi.registry.LocateRegistry;
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import java.rmi.registry.Registry;
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/**
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* <p>
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* The <code>Naming</code> class handles interactions with RMI registries.
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* Each method takes a URL in <code>String</code> form, which points to
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* the RMI registry. The scheme of the URL is irrelevant. The relevant
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* part is:
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* </p>
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* <p>
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* <code>//host:port/name</code>
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* </p>
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* <p>
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* which tells the method how to locate and access the registry. The host
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* and port are both optional, and default to `localhost' and the standard
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* RMI registry port (1099) respectively. The name is simply a string
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* used to refer to a particular service hosted by the registry. The
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* registry does not attempt to interpret this further.
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* </p>
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* <p>
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* RMI services are registered using one of these names, and the same name
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* is later used by the client to lookup the service and access its methods.
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* Registries can be shared by multiple services, or a service can create
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* its own registry using <code>createRegistry()</code>.
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* </p>
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*
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* @author Original author unknown.
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* @author Ingo Proetel (proetel@aicas.com)
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* @author Guilhem Lavaux (guilhem@kaffe.org)
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* @author Jeroen Frijters (jeroen@frijters.net)
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* @author Andrew John Hughes (gnu_andrew@member.fsf.org)
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* @since 1.1
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*/
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public final class Naming {
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/**
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* This class isn't intended to be instantiated.
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*/
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private Naming() {}
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/**
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* Looks for the remote object that is associated with the named service.
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* Name and location is given in form of a URL without a scheme:
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*
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* <pre>
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* //host:port/service-name
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* </pre>
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*
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* The port is optional.
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*
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* @param name the service name and location
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* @return Remote-object that implements the named service
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* @throws NotBoundException if no object implements the service
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* @throws MalformedURLException
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* @throws RemoteException
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*/
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public static Remote lookup(String name) throws NotBoundException, MalformedURLException, RemoteException {
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URL u = parseURL(name);
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String serviceName = getName(u);
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return (getRegistry(u).lookup(serviceName));
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}
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/**
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* Try to bind the given object to the given service name.
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* @param name
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* @param obj
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* @throws AlreadyBoundException
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* @throws MalformedURLException
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* @throws RemoteException
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*/
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public static void bind(String name, Remote obj) throws AlreadyBoundException, MalformedURLException, RemoteException {
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URL u = parseURL(name);
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String serviceName = getName(u);
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getRegistry(u).bind(serviceName, obj);
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}
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/**
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* Remove a binding for a given service name.
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* @param name
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* @throws RemoteException
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* @throws NotBoundException
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* @throws MalformedURLException
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*/
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public static void unbind(String name) throws RemoteException, NotBoundException, MalformedURLException {
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URL u = parseURL(name);
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String serviceName = getName(u);
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getRegistry(u).unbind(serviceName);
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}
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/**
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* Forces the binding between the given Remote-object and the given service name, even
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* if there was already an object bound to this name.
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* @param name
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* @param obj
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* @throws RemoteException
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* @throws MalformedURLException
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*/
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public static void rebind(String name, Remote obj) throws RemoteException, MalformedURLException {
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URL u = parseURL(name);
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String serviceName = getName(u);
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getRegistry(u).rebind(serviceName, obj);
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}
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/**
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* Lists all services at the named registry.
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* @param name url that specifies the registry
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* @return list of services at the name registry
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* @throws RemoteException
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* @throws MalformedURLException
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*/
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public static String[] list(String name) throws RemoteException, MalformedURLException {
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return (getRegistry(parseURL(name)).list());
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}
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private static Registry getRegistry(URL u) throws RemoteException {
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if (u.getPort() == -1) {
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return (LocateRegistry.getRegistry(u.getHost()));
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}
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else {
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return (LocateRegistry.getRegistry(u.getHost(), u.getPort()));
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}
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}
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/**
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* Parses the supplied URL and converts it to use the HTTP
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* protocol. From an RMI perspective, the scheme is irrelevant
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* and we want to be able to create a URL for which a handler is
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* available.
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*
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* @param name the URL in String form.
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* @throws MalformedURLException if the URL is invalid.
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*/
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private static URL parseURL(String name)
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throws MalformedURLException
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{
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try
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{
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URI uri = new URI(name);
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String host = uri.getHost();
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int port = uri.getPort();
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String query = uri.getQuery();
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String path = uri.getPath();
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return new URL("http",
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(host == null ? "localhost" : host),
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(port == -1 ? 1099 : port),
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uri.getPath() + (query == null ? "" : query));
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}
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catch (URISyntaxException e)
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{
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throw new MalformedURLException("The URL syntax was invalid: " +
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e.getMessage());
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}
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}
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/**
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* Checks that the URL contains a name, and removes any leading
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* slashes.
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*
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* @param url the URL to check.
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* @throws MalformedURLException if no name is specified.
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*/
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private static String getName(URL url)
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throws MalformedURLException
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{
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String filename = url.getFile();
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if (filename.length() == 0)
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throw new MalformedURLException("No path specified: " + url);
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// If the filename begins with a slash we must cut it for
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// name resolution.
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if (filename.charAt(0) == '/')
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return filename.substring(1);
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return filename;
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}
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}
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