/*
 * Copyright (c) 2003, KNOPFLERFISH project
 * 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 the KNOPFLERFISH project 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.
 */

package org.knopflerfish.bundle.http;

import java.io.InputStream;
import java.io.InterruptedIOException;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.SocketException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;

import org.knopflerfish.service.log.LogRef;


public class Transaction implements Runnable, PoolableObject {

  // private fields

  private HttpConfigWrapper httpConfig;
  private final Registrations registrations;
  private final ObjectPool requestPool;
  private final ObjectPool responsePool;

  private InputStream is = null;
  private OutputStream os = null;


  // protected fields

  protected LogRef log;

  protected Socket client = null;


  // constructors

  public Transaction(final LogRef log,
                     final Registrations registrations,
                     final ObjectPool requestPool,
                     final ObjectPool responsePool) {

    this.log = log;
    this.registrations = registrations;
    this.requestPool = requestPool;
    this.responsePool = responsePool;
  }


  // public methods

  public void init(final Socket client, final HttpConfigWrapper httpConfig) 
  {
    this.httpConfig = httpConfig;
    this.client = client;
  }

  public void init(final InputStream is, final OutputStream os, final HttpConfigWrapper httpConfig) 
  {
    this.httpConfig = httpConfig;
    this.is = is;
    this.os = os;
  }


  // implements Runnable

  public void run() {

    final RequestImpl request = (RequestImpl) requestPool.get();
    final ResponseImpl response = (ResponseImpl) responsePool.get();

    InetAddress remoteAddress = null;

    try {

      if (client != null) {
        client.setSoTimeout(1000 * httpConfig.getConnectionTimeout());
        is = client.getInputStream();
        os = client.getOutputStream();
        remoteAddress = client.getInetAddress();
      }

      while (true) {

        try {

          request.init(is, remoteAddress, httpConfig);
          response.init(os, request, httpConfig);

          String uri = request.getRequestURI();
          RequestDispatcherImpl dispatcher = registrations.getRequestDispatcher(uri);
          if (dispatcher != null) {
            try {
              request.setServletPath(dispatcher.getServletPath());
              dispatcher.forward(request, response);
            } catch (ServletException se) {
              response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            }
          } else {
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
          }

        } catch (HttpException he) {

          response.init(os, httpConfig);
          response.sendError(he.getCode(), he.getMessage());
        }

        response.commit();

        if (response.getKeepAlive()) {
          InputStream is = request.getRawInputStream();
          if (is != null && is.markSupported()) {
            is.mark(4);
            if (is.read() != '\r' || is.read() != '\n')
              is.reset();
          }
        } else
          break;

        request.destroy();
        response.destroy();
      }

    } catch (SocketException se) {
      // ignore: client closed socket
    } catch (InterruptedIOException iioe) {
      // ignore: keep alive socket timeout
    } catch (IOException ioe) {
      // ignore: broken pipe
    } catch (ThreadDeath td) {
      throw td;
    } catch (Throwable t) {
      if (log.doError()) log.error("Internal error", t);
      try {
        response.init(os, request, httpConfig);
        response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                           "Internal error: " + t);
      } catch (IOException ignore) { }
    } finally {

      requestPool.put(request);
      responsePool.put(response);

      if (is != null) {
        try {
          is.close();
        } catch (Exception ignore) { }
      }
      if (os != null) {
        try {
          // os.flush();
          os.close();
        } catch (Exception ignore) { }
      }
      if (client != null) {
        try {
          client.close();
        } catch (Exception ignore) { }
      }
    }
  }


  // implements PoolableObject

  public void init() {
  }

  public void destroy() {

    client = null;
    is = null;
    os = null;
  }

} // Transaction