//
   //  ========================================================================
   //  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 java.nio.channels.AsynchronousCloseException;
  import java.util.concurrent.TimeoutException;
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.eclipse.jetty.client.HttpConnection;
  import org.eclipse.jetty.client.HttpDestination;
  import org.eclipse.jetty.client.HttpExchange;
  import org.eclipse.jetty.client.SendFailure;
  import org.eclipse.jetty.client.api.Connection;
  import org.eclipse.jetty.client.api.Request;
  import org.eclipse.jetty.client.api.Response;
  import org.eclipse.jetty.io.AbstractConnection;
  import org.eclipse.jetty.io.EndPoint;
  import org.eclipse.jetty.util.Promise;
  import org.eclipse.jetty.util.log.Log;
  import org.eclipse.jetty.util.log.Logger;
  import org.eclipse.jetty.util.thread.Sweeper;
  
  public class HttpConnectionOverHTTP extends AbstractConnection implements Connection, Sweeper.Sweepable
  {
      private static final Logger LOG = Log.getLogger(HttpConnectionOverHTTP.class);
  
      private final AtomicBoolean closed = new AtomicBoolean();
      private final AtomicInteger sweeps = new AtomicInteger();
      private final Promise<Connection> promise;
      private final Delegate delegate;
      private final HttpChannelOverHTTP channel;
      private long idleTimeout;
  
      public HttpConnectionOverHTTP(EndPoint endPoint, HttpDestination destination, Promise<Connection> promise)
      {
          super(endPoint, destination.getHttpClient().getExecutor());
          this.promise = promise;
          this.delegate = new Delegate(destination);
          this.channel = newHttpChannel();
      }
  
      protected HttpChannelOverHTTP newHttpChannel()
      {
          return new HttpChannelOverHTTP(this);
      }
  
      public HttpChannelOverHTTP getHttpChannel()
      {
          return channel;
      }
  
      public HttpDestinationOverHTTP getHttpDestination()
      {
          return (HttpDestinationOverHTTP)delegate.getHttpDestination();
      }
  
      @Override
      public void send(Request request, Response.CompleteListener listener)
      {
          delegate.send(request, listener);
      }
  
      protected SendFailure send(HttpExchange exchange)
      {
          return delegate.send(exchange);
      }
  
      @Override
      public void onOpen()
      {
          super.onOpen();
          fillInterested();
          promise.succeeded(this);
      }
  
      public boolean isClosed()
      {
          return closed.get();
      }
  
      @Override
      public boolean onIdleExpired()
     {
         boolean close = delegate.onIdleTimeout();
         if (close)
             close(new TimeoutException("Idle timeout " + getEndPoint().getIdleTimeout() + "ms"));
         return false;
     }
 
     @Override
     public void onFillable()
     {
         HttpExchange exchange = channel.getHttpExchange();
         if (exchange != null)
         {
             channel.receive();
         }
         else
         {
             // If there is no exchange, then could be either a remote close,
             // or garbage bytes; in both cases we close the connection
             close();
         }
     }
 
     public void release()
     {
         // Restore idle timeout
         getEndPoint().setIdleTimeout(idleTimeout);
         getHttpDestination().release(this);
     }
 
     @Override
     public void close()
     {
         close(new AsynchronousCloseException());
     }
 
     protected void close(Throwable failure)
     {
         if (closed.compareAndSet(false, true))
         {
             // First close then abort, to be sure that the connection cannot be reused
             // from an onFailure() handler or by blocking code waiting for completion.
             getHttpDestination().close(this);
             getEndPoint().shutdownOutput();
             if (LOG.isDebugEnabled())
                 LOG.debug("Shutdown {}", this);
             getEndPoint().close();
             if (LOG.isDebugEnabled())
                 LOG.debug("Closed {}", this);
 
             abort(failure);
         }
     }
 
     protected boolean abort(Throwable failure)
     {
         HttpExchange exchange = channel.getHttpExchange();
         return exchange != null && exchange.getRequest().abort(failure);
     }
 
     @Override
     public boolean sweep()
     {
         if (!closed.get())
             return false;
         if (sweeps.incrementAndGet() < 4)
             return false;
         return true;
     }
 
     @Override
     public String toString()
     {
         return String.format("%s@%h(l:%s <-> r:%s,closed=%b)[%s]",
                 getClass().getSimpleName(),
                 this,
                 getEndPoint().getLocalAddress(),
                 getEndPoint().getRemoteAddress(),
                 closed.get(),
                 channel);
     }
 
     private class Delegate extends HttpConnection
     {
         private Delegate(HttpDestination destination)
         {
             super(destination);
         }
 
         @Override
         protected SendFailure send(HttpExchange exchange)
         {
             Request request = exchange.getRequest();
             normalizeRequest(request);
 
             // Save the old idle timeout to restore it.
             EndPoint endPoint = getEndPoint();
             idleTimeout = endPoint.getIdleTimeout();
             endPoint.setIdleTimeout(request.getIdleTimeout());
 
             // One channel per connection, just delegate the send.
             return send(channel, exchange);
         }
 
         @Override
         public void close()
         {
             HttpConnectionOverHTTP.this.close();
         }
 
         @Override
         public String toString()
         {
             return HttpConnectionOverHTTP.this.toString();
         }
     }
 }