httpserver.java

jxme的一些相关程序,主要是手机上程序开发以及手机和计算机通信的一些程序资料,程序编译需要Ant支持

/************************************************************************
 *
 * $Id: HttpServer.java,v 1.2 2002/03/04 21:42:57 echtcherbina Exp $
 *
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"
 *    must not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL SUN MICROSYSTEMS OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 *********************************************************************************/

package net.jxta.impl.endpoint.http;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.SequenceInputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

//PDA requirements 18.02.2002
// HashMap -> Hashtable
// import java.util.HashMap;

import java.util.Hashtable;
import java.util.Vector;

import java.net.BindException;
import java.io.IOException;

import org.apache.log4j.Category; import org.apache.log4j.Priority;

/**
 *  This thread handles incoming connections
 **/
class HttpServer extends Thread {
    private static final Category LOG = Category.getInstance(HttpServer.class.getName());

    public  static final int MaxCnxBacklog = 50; // Java's default is 50

    /**
     *  The transport which owns this Http server.
     **/
    private HttpTransport owner = null;

    /**
     *  Pool of threads used to receive incoming connections.
     **/
    private UnicastThreadPool unicastPool = null;

    /**
     *  The socket we listen for connections on.
     **/
    private ServerSocket        serverSocket;

    /**
     *  These are connections we have with clients as a server.
     **/

    //PDA requirements 18.02.2002
    // HashMap -> Hashtable
    // private HashMap             clientConnections = new Hashtable();
    private Hashtable           clientConnections = new Hashtable();

    /**
     *  Manages the pool of available incoming connection threads.
     **/
    class UnicastThreadPool {
        /**
         *  How many threads we should make to listen for incoming connections
         **/
        public  static final int DefaultNbOfUnicastThreads = 5;

        /**
         *  The maximum number of threads we will create.
         **/
        public  static final int MaxNbOfUnicastThreads = 25;

        /**
         *  number of unicast threads in existance. This number may go up and down
         **/
        private volatile int unicastThreads = 0;

        /**
         *  Counter used for naming unicast threads. Always incrementing.
         **/
        private volatile int unicastThreadNumber = 0;

        /**
         *  Pool of unicast threads which are not currently processing incoming
         *  socket connections.
         **/
        private Vector threadPool = new Vector(MaxNbOfUnicastThreads);

        /**
         *  Initializes the pool of threads used to manage incoming unicast
         *  connections.
         **/
        public UnicastThreadPool(  ) {
            // DO NOT CREATE the threads in the ctor. They need a reference
            // to this pool object which is not assigned until the ctor
            // returns.
        }

        /**
         * Create the initial set of threads.
         */
        public void createThreads() {
            createThreads( DefaultNbOfUnicastThreads );
        }

        /**
         * Create the initial set of threads.
         *
         *  @param initialNumber the number of initial threads to create.
         */
        public void createThreads( int initialNumber ) {

            initialNumber = Math.min( initialNumber, MaxNbOfUnicastThreads );

            for( int i = 1; i <= initialNumber; i++ ) {
                newIncomingThread( );
            }
        }

        /**
         *  create a new thread for this pool.
         **/
        private void newIncomingThread(  ) {
            synchronized ( threadPool ) {
                unicastThreads++;
                (new IncomingUnicastThread(
                Integer.toString(++unicastThreadNumber) )).start();
            }
        }

        /**
         *  Process an incoming unicast socket. This consists of finding a thread
         *  on which to process the request and dispatching the socket to that
         *  thread.
         *
         *  @param timeOut amount of time to wait for a thread
         *  @return IncomingUnicastThread on which can be used to handle socket
         *   connections.
         **/
        IncomingUnicastThread getIncomingThread( long timeOut )
        throws InterruptedException {
            IncomingUnicastThread willUse = null;

            long realTimeOut = System.currentTimeMillis() + timeOut;

            do {
                synchronized( threadPool ) {
                    if( threadPool.size() > 0 ) {
                        willUse = (IncomingUnicastThread) (threadPool.lastElement());
                        threadPool.removeElementAt( threadPool.size() - 1 );
                        break;
                    }

                    // Make a new thread if we are not at the max
                    if( unicastThreads < MaxNbOfUnicastThreads ) {
                        newIncomingThread();
                        if (LOG.isEnabledFor(Priority.DEBUG)) LOG.debug( "Made a new unicast thread (#" +
                        unicastThreadNumber + " of " + unicastThreads + " total)" );
                    }

                    // now wait and see if we can get a thread
                    threadPool.wait(timeOut);

                    if( threadPool.size() > 0 ) {
                        willUse = (IncomingUnicastThread) (threadPool.lastElement());
                        threadPool.removeElementAt( threadPool.size() - 1 );
                        break;
                    }

                    if ( 0 != timeOut ) {
                        // reduce the wait timeOut by the amount we have already
                        // waited.
                        timeOut = (realTimeOut - System.currentTimeMillis());

                        if( timeOut <= 0 ) {
                            // we have passed the time at which we said we would stop
                            break;  // so we give up.
                        }
                    }
                }
            } while( true );

            return willUse;
        }

        /**
         *  put a thread into the pool
         *
         *  @param theThread    the thread being added to the pool
         *
         **/
        public void availableThread( IncomingUnicastThread theThread ) {
            synchronized( threadPool ) {
                threadPool.addElement( theThread );

                // tell someone who cares...
                threadPool.notify();
            }
        }

        /**
         *  Notify the pool that a thread has died. This may allow the pool to
         *  create another thread.
         *
         *  @param theThread    the thread which is dying. if currently in the
         *   pool then it will be removed.
         *
         **/
        public void threadDied( IncomingUnicastThread theThread ) {
            synchronized ( threadPool ) {
                unicastThreads--;

                // ensure that its not still in the pool
                threadPool.removeElement( theThread );
            }
        }
    }

    /**
     *  Provides a thread on which to process an incoming socket connection
     **/
    class IncomingUnicastThread extends Thread {

        HttpTransport tp = null;

        Socket socket = null;

        /**
         *  Default constructor. We place ourself in the transports thread
         *  group with the specified name.
         *
         *  @param tp   The HttpTransport we are working for.
         *  @param name the name of this instance.
         **/
        private IncomingUnicastThread( String name ) {
            super( HttpServer.this.getThreadGroup(), (Runnable) null, "incoming unicast " + name );
        }

        /**
         *  Set the the socket that the thread should be working on.
         **/
        void setSocket( Socket theSocket ) {
            socket = theSocket;
        }

        /**
         *  We wait upon ourself for someone to wake us with a socket to process
         *  if we are woken prematurely, that probably means we are being asked
         *  to quit.
         **/
        public void run() {