//
   //  ========================================================================
   //  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.client.http;
  
  import org.eclipse.jetty.client.HttpChannel;
  import org.eclipse.jetty.client.HttpExchange;
  import org.eclipse.jetty.client.HttpReceiver;
  import org.eclipse.jetty.client.HttpSender;
  import org.eclipse.jetty.client.api.Response;
  import org.eclipse.jetty.client.api.Result;
  import org.eclipse.jetty.http.HttpFields;
  import org.eclipse.jetty.http.HttpHeader;
  import org.eclipse.jetty.http.HttpHeaderValue;
  import org.eclipse.jetty.http.HttpMethod;
  import org.eclipse.jetty.http.HttpVersion;
  
  public class HttpChannelOverHTTP extends HttpChannel
  {
      private final HttpConnectionOverHTTP connection;
      private final HttpSenderOverHTTP sender;
      private final HttpReceiverOverHTTP receiver;
  
      public HttpChannelOverHTTP(HttpConnectionOverHTTP connection)
      {
          super(connection.getHttpDestination());
          this.connection = connection;
          this.sender = newHttpSender();
          this.receiver = newHttpReceiver();
      }
  
      protected HttpSenderOverHTTP newHttpSender()
      {
          return new HttpSenderOverHTTP(this);
      }
  
      protected HttpReceiverOverHTTP newHttpReceiver()
      {
          return new HttpReceiverOverHTTP(this);
      }
  
      @Override
      protected HttpSender getHttpSender()
      {
          return sender;
      }
  
      @Override
      protected HttpReceiver getHttpReceiver()
      {
          return receiver;
      }
  
      public HttpConnectionOverHTTP getHttpConnection()
      {
          return connection;
      }
  
      @Override
      public void send()
      {
          HttpExchange exchange = getHttpExchange();
          if (exchange != null)
              sender.send(exchange);
      }
  
      @Override
      public void release()
      {
          connection.release();
      }
  
      public void receive()
      {
          receiver.receive();
      }
  
      @Override
      public void exchangeTerminated(HttpExchange exchange, Result result)
      {
          super.exchangeTerminated(exchange, result);
  
          Response response = result.getResponse();
          HttpFields responseHeaders = response.getHeaders();
 
         String closeReason = null;
         if (result.isFailed())
             closeReason = "failure";
         else if (receiver.isShutdown())
             closeReason = "server close";
 
         if (closeReason == null)
         {
             if (response.getVersion().compareTo(HttpVersion.HTTP_1_1) < 0)
             {
                 // HTTP 1.0 must close the connection unless it has
                 // an explicit keep alive or it's a CONNECT method.
                 boolean keepAlive = responseHeaders.contains(HttpHeader.CONNECTION, HttpHeaderValue.KEEP_ALIVE.asString());
                 boolean connect = HttpMethod.CONNECT.is(exchange.getRequest().getMethod());
                 if (!keepAlive && !connect)
                     closeReason = "http/1.0";
             }
             else
             {
                 // HTTP 1.1 or greater closes only if it has an explicit close.
                 if (responseHeaders.contains(HttpHeader.CONNECTION, HttpHeaderValue.CLOSE.asString()))
                     closeReason = "http/1.1";
             }
         }
 
         if (closeReason != null)
         {
             if (LOG.isDebugEnabled())
                 LOG.debug("Closing, reason: {} - {}", closeReason, connection);
             connection.close();
         }
         else
         {
             release();
         }
     }
 
     @Override
     public String toString()
     {
         return String.format("%s[send=%s,recv=%s]",
                 super.toString(),
                 sender,
                 receiver);
     }
 }