/*

 * Copyright 2002 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

import java.net.*;

import java.util.*;

import java.io.IOException;

/**

 * This class provides a partial implementation of the HttpCallback

 * interface. Use this class if you want to use the requestURI as a means

 * of tracking multiple invocations of a request (on the server).

 * In this case, you implement the modified request() method, which includes

 * an integer count parameter. This parameter indicates the number of times

 * (starting at zero) the request URI has been received.

 */

public abstract class AbstractCallback implements HttpCallback {

    Map requests;

    static class Request {

        URI uri;

        int count;

        Request (URI u) {

            uri = u;

            count = 0;

        }

    }

    AbstractCallback () {

        requests = Collections.synchronizedMap (new HashMap());

    }

    /**

     * handle the given request and generate an appropriate response.

     * @param msg the transaction containing the request from the

     *        client and used to send the response

     */

    public void request (HttpTransaction msg) {

        URI uri = msg.getRequestURI();

        Request req = (Request) requests.get (uri);

        if (req == null) {

            req = new Request (uri);

            requests.put (uri, req);

        }

        request (msg, req.count++);

    }

    /**

     * Same as HttpCallback interface except that the integer n

     * is provided to indicate sequencing of repeated requests using

     * the same request URI. n starts at zero and is incremented

     * for each successive call.

     *

     * @param msg the transaction containing the request from the

     *        client and used to send the response

     * @param n value is 0 at first call, and is incremented by 1 for

     *        each subsequent call using the same request URI.

     */

    abstract public void request (HttpTransaction msg, int n);

}