//
   //  ========================================================================
   //  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.http2.server;
  
  import java.util.Objects;
  
  import org.eclipse.jetty.http2.BufferingFlowControlStrategy;
  import org.eclipse.jetty.http2.FlowControlStrategy;
  import org.eclipse.jetty.http2.HTTP2Connection;
  import org.eclipse.jetty.http2.api.server.ServerSessionListener;
  import org.eclipse.jetty.http2.generator.Generator;
  import org.eclipse.jetty.http2.parser.ServerParser;
  import org.eclipse.jetty.io.Connection;
  import org.eclipse.jetty.io.EndPoint;
  import org.eclipse.jetty.server.AbstractConnectionFactory;
  import org.eclipse.jetty.server.Connector;
  import org.eclipse.jetty.server.HttpConfiguration;
  import org.eclipse.jetty.util.annotation.ManagedAttribute;
  import org.eclipse.jetty.util.annotation.ManagedObject;
  import org.eclipse.jetty.util.annotation.Name;
  import org.eclipse.jetty.util.component.LifeCycle;
  
  @ManagedObject
  public abstract class AbstractHTTP2ServerConnectionFactory extends AbstractConnectionFactory
  {
      private final Connection.Listener connectionListener = new ConnectionListener();
      private final HttpConfiguration httpConfiguration;
      private int maxDynamicTableSize = 4096;
      private int initialStreamSendWindow = FlowControlStrategy.DEFAULT_WINDOW_SIZE;
      private int maxConcurrentStreams = -1;
      private int maxHeaderBlockFragment = 0;
      private FlowControlStrategy.Factory flowControlStrategyFactory = () -> new BufferingFlowControlStrategy(0.5F);
  
      public AbstractHTTP2ServerConnectionFactory(@Name("config") HttpConfiguration httpConfiguration)
      {
          this(httpConfiguration,"h2","h2-17","h2-16","h2-15","h2-14");
      }
  
      protected AbstractHTTP2ServerConnectionFactory(@Name("config") HttpConfiguration httpConfiguration, String... protocols)
      {
          super(protocols);
          this.httpConfiguration = Objects.requireNonNull(httpConfiguration);
          addBean(httpConfiguration);
      }
  
      @ManagedAttribute("The HPACK dynamic table maximum size")
      public int getMaxDynamicTableSize()
      {
          return maxDynamicTableSize;
      }
  
      public void setMaxDynamicTableSize(int maxDynamicTableSize)
      {
          this.maxDynamicTableSize = maxDynamicTableSize;
      }
  
      @ManagedAttribute("The initial size of stream's flow control send window")
      public int getInitialStreamSendWindow()
      {
          return initialStreamSendWindow;
      }
  
      public void setInitialStreamSendWindow(int initialStreamSendWindow)
      {
          this.initialStreamSendWindow = initialStreamSendWindow;
      }
  
      @ManagedAttribute("The max number of concurrent streams per session")
      public int getMaxConcurrentStreams()
      {
          return maxConcurrentStreams;
      }
  
      public void setMaxConcurrentStreams(int maxConcurrentStreams)
      {
          this.maxConcurrentStreams = maxConcurrentStreams;
      }
  
      public int getMaxHeaderBlockFragment()
      {
          return maxHeaderBlockFragment;
      }
  
     public void setMaxHeaderBlockFragment(int maxHeaderBlockFragment)
     {
         this.maxHeaderBlockFragment = maxHeaderBlockFragment;
     }
 
     public FlowControlStrategy.Factory getFlowControlStrategyFactory()
     {
         return flowControlStrategyFactory;
     }
 
     public void setFlowControlStrategyFactory(FlowControlStrategy.Factory flowControlStrategyFactory)
     {
         this.flowControlStrategyFactory = flowControlStrategyFactory;
     }
 
     public HttpConfiguration getHttpConfiguration()
     {
         return httpConfiguration;
     }
 
     @Override
     public Connection newConnection(Connector connector, EndPoint endPoint)
     {
         ServerSessionListener listener = newSessionListener(connector, endPoint);
 
         Generator generator = new Generator(connector.getByteBufferPool(), getMaxDynamicTableSize(), getMaxHeaderBlockFragment());
         FlowControlStrategy flowControl = newFlowControlStrategy();
         if (flowControl == null)
             flowControl = getFlowControlStrategyFactory().newFlowControlStrategy();
         HTTP2ServerSession session = new HTTP2ServerSession(connector.getScheduler(), endPoint, generator, listener, flowControl);
         session.setMaxLocalStreams(getMaxConcurrentStreams());
         session.setMaxRemoteStreams(getMaxConcurrentStreams());
         // For a single stream in a connection, there will be a race between
         // the stream idle timeout and the connection idle timeout. However,
         // the typical case is that the connection will be busier and the
         // stream idle timeout will expire earlier that the connection's.
         session.setStreamIdleTimeout(endPoint.getIdleTimeout());
 
         ServerParser parser = newServerParser(connector, session);
         HTTP2Connection connection = new HTTP2ServerConnection(connector.getByteBufferPool(), connector.getExecutor(),
                         endPoint, httpConfiguration, parser, session, getInputBufferSize(), listener);
         connection.addListener(connectionListener);
         return configure(connection, connector, endPoint);
     }
 
     /**
      * @deprecated use {@link #setFlowControlStrategyFactory(FlowControlStrategy.Factory)} instead
      */
     @Deprecated
     protected FlowControlStrategy newFlowControlStrategy()
     {
         return null;
     }
 
     protected abstract ServerSessionListener newSessionListener(Connector connector, EndPoint endPoint);
 
     protected ServerParser newServerParser(Connector connector, ServerParser.Listener listener)
     {
         return new ServerParser(connector.getByteBufferPool(), listener, getMaxDynamicTableSize(), getHttpConfiguration().getRequestHeaderSize());
     }
 
     private class ConnectionListener implements Connection.Listener
     {
         @Override
         public void onOpened(Connection connection)
         {
             addManaged((LifeCycle)((HTTP2Connection)connection).getSession());
         }
 
         @Override
         public void onClosed(Connection connection)
         {
             removeBean(((HTTP2Connection)connection).getSession());
         }
     }
 }