/*

 * Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *   - Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 *

 *   - 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.

 *

 *   - Neither the name of Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS 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 THE COPYRIGHT OWNER OR

 * 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 source code is provided to illustrate the usage of a given feature

 * or technique and has been deliberately simplified. Additional steps

 * required for a production-quality application, such as security checks,

 * input validation and proper error handling, might not be present in

 * this sample code.

 */

import java.io.*;

import java.nio.*;

/**

 * Primary driver class used by blocking Servers to receive,

 * prepare, send, and shutdown requests.

 *

 * @author Mark Reinhold

 * @author Brad R. Wetmore

 */

class RequestServicer implements Runnable {

    private ChannelIO cio;

    private static int created = 0;

    RequestServicer(ChannelIO cio) {

        this.cio = cio;

        // Simple heartbeat to let user know we're alive.

        synchronized (RequestServicer.class) {

            created++;

            if ((created % 50) == 0) {

                System.out.println(".");

                created = 0;

            } else {

                System.out.print(".");

            }

        }

    }

    private void service() throws IOException {

        Reply rp = null;

        try {

            ByteBuffer rbb = receive();         // Receive

            Request rq = null;

            try {                               // Parse

                rq = Request.parse(rbb);

            } catch (MalformedRequestException x) {

                rp = new Reply(Reply.Code.BAD_REQUEST,

                               new StringContent(x));

            }

            if (rp == null) rp = build(rq);     // Build

            do {} while (rp.send(cio));         // Send

            do {} while (!cio.shutdown());

            cio.close();

            rp.release();

        } catch (IOException x) {

            String m = x.getMessage();

            if (!m.equals("Broken pipe") &&

                    !m.equals("Connection reset by peer")) {

                System.err.println("RequestHandler: " + x.toString());

            }

            try {

                /*

                 * We had a failure here, so we'll try to be nice

                 * before closing down and send off a close_notify,

                 * but if we can't get the message off with one try,

                 * we'll just shutdown.

                 */

                cio.shutdown();

            } catch (IOException e) {

                // ignore

            }

            cio.close();

            if (rp != null) {

                rp.release();

            }

        }

    }

    public void run() {

        try {

            service();

        } catch (IOException x) {

            x.printStackTrace();

        }

    }

    ByteBuffer receive() throws IOException {

        do {} while (!cio.doHandshake());

        for (;;) {

            int read = cio.read();

            ByteBuffer bb = cio.getReadBuf();

            if ((read < 0) || (Request.isComplete(bb))) {

                bb.flip();

                return bb;

            }

        }

    }

    Reply build(Request rq) throws IOException {

        Reply rp = null;

        Request.Action action = rq.action();

        if ((action != Request.Action.GET) &&

                (action != Request.Action.HEAD))

            rp = new Reply(Reply.Code.METHOD_NOT_ALLOWED,

                           new StringContent(rq.toString()));

        else

            rp = new Reply(Reply.Code.OK,

                           new FileContent(rq.uri()), action);

        try {

            rp.prepare();

        } catch (IOException x) {

            rp.release();

            rp = new Reply(Reply.Code.NOT_FOUND,

                           new StringContent(x));

            rp.prepare();

        }

        return rp;

    }

}