Quadcap Embeddable Server

com/quadcap/net/server/Acceptor.java

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package com.quadcap.net.server;

/* Copyright 1999 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.io.IOException;

import java.net.ServerSocket;
import java.net.Socket;

import com.quadcap.util.Debug;

/**
 * Implements the main socket listening thread: we first obtain a block
 * of idle workers (currently 4, should be configurable though.) 
 * then accept connections and pass them out until we need more workers.
 *
 * @author Stan Bailes
 */
public class Acceptor implements Runnable {
    Server                              server;
    int                                 port;
    ServerSocket                        serverSocket;
    boolean                             terminate       = false;

    public Acceptor(Server server, int port, int queueDepth)
        throws IOException
    {
        this.server = server;
        this.port = port;
        this.serverSocket = new ServerSocket(port, queueDepth);
    }

    public void run() {
        while (!terminate) {
            try {
                Worker w = server.getIdleWorker();
                Socket socket = null;
                try {
                    socket = serverSocket.accept();
                    w.handle(socket, port);
                } catch (Throwable e) {
                    Debug.print(e);
                    server.returnIdleWorker(w);
                }
            } catch (Throwable e) {
                Debug.print(e);
                terminate = true;
            }
        }
    }

    static final int WCNT = 4;
    
    public void runxxx() {
        Worker[] wv = new Worker[WCNT];
        int valid = -1;
        int pos = 0;
        while (!terminate) {
            try {
                while (pos >= valid) {
                    valid = server.getIdleWorkers(wv);
                    pos = 0;
                }
                while (pos < valid && !terminate) {
                    Worker w = wv[pos++];
                    try {
                        Socket socket = serverSocket.accept();
                        w.handle(socket, port);
                    } catch (Throwable e) {
                        Debug.print(e);
                        server.returnIdleWorker(w);
                    }
                }
            } catch (Exception e) {
                Debug.print(e);
                terminate = true;
            }
        }
    }

    public void stop() {
    }
}