org/objectweb/proactive/core/rmi/ClassServer.java

/* 
 * ################################################################
 * 
 * ProActive: The Java(TM) library for Parallel, Distributed, 
 *            Concurrent computing with Security and Mobility
 * 
 * Copyright (C) 1997-2007 INRIA/University of Nice-Sophia Antipolis
 * Contact: proactive@objectweb.org
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 *  
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *  
 *  Initial developer(s):               The ProActive Team
 *                        http://www.inria.fr/oasis/ProActive/contacts.html
 *  Contributor(s): 
 * 
 * ################################################################
 */ 
package org.objectweb.proactive.core.rmi;

import java.net.UnknownHostException;

import org.apache.log4j.Logger;
import org.objectweb.proactive.core.config.ProActiveConfiguration;
import org.objectweb.proactive.core.util.UrlBuilder;
import org.objectweb.proactive.core.util.log.Loggers;
import org.objectweb.proactive.core.util.log.ProActiveLogger;


public class ClassServer implements Runnable {
    protected static Logger logger = ProActiveLogger.getLogger(Loggers.CLASSLOADING);
    public static final int DEFAULT_SERVER_BASE_PORT = 2010;
    protected static int DEFAULT_SERVER_PORT_INCREMENT = 2;
    protected static int MAX_RETRY = 500;
    private static java.util.Random random = new java.util.Random();
    protected static int port;

    static {
        String newport;

        if (System.getProperty("proactive.http.port") != null) {
            newport = System.getProperty("proactive.http.port");
        } else {
            newport = new Integer(DEFAULT_SERVER_BASE_PORT).toString();
            System.setProperty("proactive.http.port", newport);
        }
    }

    protected String hostname;
    private java.net.ServerSocket server = null;
    protected String paths;

    protected ClassServer() throws java.io.IOException {
        this(0, null);
    }

    protected ClassServer(int port_) throws java.io.IOException {
        if (port == 0) {
            port = boundServerSocket(Integer.parseInt(System.getProperty(
                            "proactive.http.port")), MAX_RETRY);
        } else {
            port = port_;
            server = new java.net.ServerSocket(port);
        }

        hostname = java.net.InetAddress.getLocalHost().getHostAddress();
        //        System.out.println("URL du classServer : " + hostname + ":" + port);
        newListener();
        //        if (logger.isInfoEnabled()) {
        //            logger.info("communication protocol = " +System.getProperty("proactive.communication.protocol")+", http server port = " + port);
        //        }
    }

    protected ClassServer(int port_, String paths) throws java.io.IOException {
        this(port_);
        this.paths = paths;
        printMessage();
    }

    public ClassServer(String paths) throws java.io.IOException {
        this(0, paths);
    }

    //
    // -- PUBLIC METHODS -----------------------------------------------
    //
    public static boolean isPortAlreadyBound(int port) {
        java.net.Socket socket = null;

        try {
            socket = new java.net.Socket(java.net.InetAddress.getLocalHost(),
                    port);

            // if we can connect to the port it means the server already exists
            return true;
        } catch (java.io.IOException e) {
            return false;
        } finally {
            try {
                if (socket != null) {
                    socket.close();
                }
            } catch (java.io.IOException e) {
            }
        }
    }

    private void printMessage() {
        if (logger.isDebugEnabled()) {
            logger.info(
                "To use this ClassFileServer set the property java.rmi.server.codebase to http://" +
                hostname + ":" + port + "/");
        }

        if (this.paths == null) {
            logger.info(
                " --> This ClassFileServer is reading resources from classpath " +
                port);
        } else {
            logger.info(
                " --> This ClassFileServer is reading resources from the following paths");

            //for (int i = 0; i < codebases.length; i++) {
            logger.info(paths);

            //codebases[i].getAbsolutePath());
        }
    }

    public static int getServerSocketPort() {
        if (ProActiveConfiguration.osgiServletEnabled()) {
            return ClassServerServlet.getPort();
        }
        return port;
    }

    public String getHostname() {
        return hostname;
    }

    public static String getUrl() {
        try {
            if (ProActiveConfiguration.osgiServletEnabled()) {
                return ClassServerServlet.getUrl();
            } else {
                return UrlBuilder.buildUrl(UrlBuilder.getHostNameorIP(
                        java.net.InetAddress.getLocalHost()), "", "http:", port);
            }
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
        return UrlBuilder.buildUrl("localhost", "", "http:", port);
    }

    public void run() {
        java.net.Socket socket = null;

        // accept a connection
        while (true) {
            try {
                socket = server.accept();

                HTTPRequestHandler service = (new HTTPRequestHandler(socket,
                        paths));
                service.start();
            } catch (java.io.IOException e) {
                System.out.println("Class Server died: " + e.getMessage());
                e.printStackTrace();

                return;
            }
        }
    } 

    private void newListener() {
        (new Thread(this, "ClassServer-" + hostname + ":" + port)).start();
    }

    private int boundServerSocket(int basePortNumber, int numberOfTry)
        throws java.io.IOException {
        for (int i = 0; i < numberOfTry; i++) {
            try {
                server = new java.net.ServerSocket(basePortNumber);
                return basePortNumber;
            } catch (java.io.IOException e) {
                basePortNumber += random.nextInt(DEFAULT_SERVER_PORT_INCREMENT);
                System.setProperty("proactive.http.port", basePortNumber + "");
            }
        }

        throw new java.io.IOException(
            "ClassServer cannot create a ServerSocket after " + numberOfTry +
            " attempts !!!");
    }
}

---