//
   //  ========================================================================
   //  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.spdy.client.http;
  
  import java.nio.channels.AsynchronousCloseException;
  import java.util.Set;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import org.eclipse.jetty.client.HttpChannel;
  import org.eclipse.jetty.client.HttpConnection;
  import org.eclipse.jetty.client.HttpDestination;
  import org.eclipse.jetty.client.HttpExchange;
  import org.eclipse.jetty.spdy.api.GoAwayInfo;
  import org.eclipse.jetty.spdy.api.Session;
  import org.eclipse.jetty.util.Callback;
  import org.eclipse.jetty.util.ConcurrentHashSet;
  
  public class HttpConnectionOverSPDY extends HttpConnection
  {
      private final Set<HttpChannel> channels = new ConcurrentHashSet<>();
      private final AtomicBoolean closed = new AtomicBoolean();
      private final Session session;
  
      public HttpConnectionOverSPDY(HttpDestination destination, Session session)
      {
          super(destination);
          this.session = session;
      }
  
      @Override
      protected void send(HttpExchange exchange)
      {
          normalizeRequest(exchange.getRequest());
          // One connection maps to N channels, so for each exchange we create a new channel
          HttpChannel channel = new HttpChannelOverSPDY(getHttpDestination(), this, session);
          channels.add(channel);
          if (channel.associate(exchange))
              channel.send();
          else
              channel.release();
      }
  
      protected void release(HttpChannel channel)
      {
          channels.remove(channel);
      }
  
      @Override
      public void close()
      {
          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);
              session.goAway(new GoAwayInfo(), Callback.Adapter.INSTANCE);
              abort(new AsynchronousCloseException());
          }
      }
  
      @Override
      public boolean isClosed()
      {
          return closed.get();
      }
  
      private void abort(Throwable failure)
      {
          for (HttpChannel channel : channels)
          {
              HttpExchange exchange = channel.getHttpExchange();
              if (exchange != null)
                  exchange.getRequest().abort(failure);
          }
          channels.clear();
      }
  }