naming.java

来自「kaffe Java 解释器语言,源码,Java的子集系统,开放源代码」· Java 代码 · 共 152 行

/*
  Copyright (c) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
 
GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */

package java.rmi;

import java.net.MalformedURLException;
import java.net.URL;
import java.rmi.registry.Registry;
import java.rmi.registry.LocateRegistry;

public final class Naming {

/** <pre>
 * Looks for the remote object that is associated with the named service.
 * Name and location is given in form of a URL without a scheme:
 * 
 *   //host:port/service-name
 *  
 * The port is optional.
 * </pre>
 * @param name the service name and location
 * @return Remote-object that implements the named service
 * @throws NotBoundException if no object implements the service
 * @throws MalformedURLException 
 * @throws RemoteException
 */
public static Remote lookup(String name) throws NotBoundException, MalformedURLException, RemoteException {
	// hack to accept "rmi://host:port/service" strings
	if(name.startsWith("rmi:")){ name = name.substring(4); }
	URL u = new URL("http:" + name);
	String filename = u.getFile();

	// If the filename begins with a slash we must cut it for
	// name resolution.
	if (filename.charAt(0) == '/')
		return (getRegistry(u).lookup(filename.substring(1)));
	else
		return (getRegistry(u).lookup(filename));
}

/**
 * Try to bind the given object to the given service name. 
 * @param name
 * @param obj
 * @throws AlreadyBoundException
 * @throws MalformedURLException
 * @throws RemoteException
 */
public static void bind(String name, Remote obj) throws AlreadyBoundException, MalformedURLException, RemoteException {
	URL u = new URL("http:" + name);
	String filename = u.getFile();
	// If the filename begins with a slash we must cut it for
	// name resolution.
	if (filename.charAt(0) == '/')
		getRegistry(u).bind(filename.substring(1), obj);
	else
		getRegistry(u).bind(filename, obj);
}

/**
 * Remove a binding for a given service name.
 * @param name
 * @throws RemoteException
 * @throws NotBoundException
 * @throws MalformedURLException
 */
public static void unbind(String name) throws RemoteException, NotBoundException, MalformedURLException {
	URL u = new URL("http:" + name);
	String filename = u.getFile();
	// If the filename begins with a slash we must cut it for
	// name resolution.
	if (filename.charAt(0) == '/')
		getRegistry(u).unbind(filename.substring(1));
	else
		getRegistry(u).unbind(filename);
}

/**
 * Forces the binding between the given Remote-object and the given service name, even 
 * if there was already an object bound to this name. 
 * @param name
 * @param obj
 * @throws RemoteException
 * @throws MalformedURLException
 */
public static void rebind(String name, Remote obj) throws RemoteException, MalformedURLException {
	URL u = new URL("http:" + name);
	String filename = u.getFile();
	// If the filename begins with a slash we must cut it for
	// name resolution.
	if (filename.charAt(0) == '/')
		getRegistry(u).rebind(filename.substring(1), obj);
	else
		getRegistry(u).rebind(filename, obj);
}

/**
 * Lists all services at the named registry.
 * @param name url that specifies the registry
 * @return list of services at the name registry
 * @throws RemoteException
 * @throws MalformedURLException
 */
public static String[] list(String name) throws RemoteException, MalformedURLException {
	return (getRegistry(new URL("http:" + name)).list());
}

private static Registry getRegistry(URL u) throws RemoteException {
	if (u.getPort() == -1) {
		return (LocateRegistry.getRegistry(u.getHost()));
	}
	else {
		return (LocateRegistry.getRegistry(u.getHost(), u.getPort()));
	}
}

}