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Java example source code file (RMIHelper.java)

This example Java source code file (RMIHelper.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

debuggerexception, exception, net, network, numberformatexception, remote, remoteexception, rmi, rmihelper, saremotedebugger, string, stringbuffer

The RMIHelper.java Java example source code

/*
 * Copyright (c) 2004, 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.
 *
 * 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 sun.jvm.hotspot;

import java.io.*;
import java.net.*;
import java.rmi.*;
import java.rmi.registry.*;
import sun.jvm.hotspot.debugger.DebuggerException;

public class RMIHelper {
    private static final boolean startRegistry;
    private static int port;
    private static String serverNamePrefix;

    static {
        String tmp = System.getProperty("sun.jvm.hotspot.rmi.startRegistry");
        if (tmp != null && tmp.equals("false")) {
            startRegistry = false;
        } else {
            // by default, we attempt to start rmiregistry
            startRegistry = true;
        }

        port = Registry.REGISTRY_PORT;
        tmp = System.getProperty("sun.jvm.hotspot.rmi.port");
        if (tmp != null) {
            try {
                port = Integer.parseInt(tmp);
            } catch (NumberFormatException nfe) {
                System.err.println("invalid port supplied, assuming default");
            }
        }

        tmp = System.getProperty("sun.jvm.hotspot.rmi.serverNamePrefix");
        serverNamePrefix = (tmp != null)? serverNamePrefix : "SARemoteDebugger";
    }

    public static void rebind(String uniqueID, Remote object) throws DebuggerException {
        String name = getName(uniqueID);
        try {
            Naming.rebind(name, object);
        } catch (RemoteException re) {
            if (startRegistry) {
                // may be the user didn't start rmiregistry, try to start it
                try {
                    LocateRegistry.createRegistry(port);
                    Naming.rebind(name, object);
                } catch (Exception exp) {
                    throw new DebuggerException(exp);
                }
            } else {
                throw new DebuggerException(re);
            }
        } catch (Exception exp) {
            throw new DebuggerException(exp);
        }
    }

    public static void unbind(String uniqueID) throws DebuggerException {
        String name = getName(uniqueID);
        try {
            Naming.unbind(name);
        } catch (Exception exp) {
            throw new DebuggerException(exp);
        }
    }

    public static Remote lookup(String debugServerID) throws DebuggerException {
        // debugServerID follows the pattern [unique_id@]host[:port]
        // we have to transform this as //host[:port]/<serverNamePrefix>['_']

        int index = debugServerID.indexOf('@');
        StringBuffer nameBuf = new StringBuffer("//");
        String uniqueID = null;
        if (index != -1) {
            nameBuf.append(debugServerID.substring(index + 1));
            uniqueID = debugServerID.substring(0, index);
        } else {
            nameBuf.append(debugServerID);
        }

        nameBuf.append('/');
        nameBuf.append(serverNamePrefix);
        if (uniqueID != null) {
            nameBuf.append('_');
            nameBuf.append(uniqueID);
        }

        try {
            return Naming.lookup(nameBuf.toString());
        } catch (Exception exp) {
            throw new DebuggerException(exp);
        }
    }

    private static String getName(String uniqueID) {
        String name = null;
        if (uniqueID != null) {
           name = serverNamePrefix + "_" + uniqueID;
        } else {
           name = serverNamePrefix;
        }
        if (port != Registry.REGISTRY_PORT) {
           name = "//localhost:" + port + "/" + name;
        }
        return name;
    }
}

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