package org.apache.maven.surefire.booter.spi;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import org.apache.maven.surefire.api.booter.MasterProcessChannelDecoder;
  import org.apache.maven.surefire.api.booter.MasterProcessChannelEncoder;
  import org.apache.maven.surefire.api.fork.ForkNodeArguments;
  import org.apache.maven.surefire.api.util.internal.WritableBufferedByteChannel;
  
  import javax.annotation.Nonnull;
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import java.net.MalformedURLException;
  import java.net.SocketOption;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.nio.ByteBuffer;
  import java.nio.channels.AsynchronousSocketChannel;
  import java.nio.channels.ReadableByteChannel;
  import java.util.StringTokenizer;
  import java.util.concurrent.ExecutionException;
  
  import static java.net.StandardSocketOptions.SO_KEEPALIVE;
  import static java.net.StandardSocketOptions.SO_REUSEADDR;
  import static java.net.StandardSocketOptions.TCP_NODELAY;
  import static java.nio.channels.AsynchronousChannelGroup.withFixedThreadPool;
  import static java.nio.channels.AsynchronousSocketChannel.open;
  import static java.nio.charset.StandardCharsets.US_ASCII;
  import static org.apache.maven.surefire.api.util.internal.Channels.newBufferedChannel;
  import static org.apache.maven.surefire.api.util.internal.Channels.newInputStream;
  import static org.apache.maven.surefire.api.util.internal.Channels.newOutputStream;
  import static org.apache.maven.surefire.api.util.internal.DaemonThreadFactory.newDaemonThreadFactory;
  
  /**
   * Producer of TCP/IP encoder and decoder.
   * <br>
   *
   * @author <a href="mailto:tibordigana@apache.org">Tibor Digana (tibor17)</a>
   * @since 3.0.0-M5
   */
  public class SurefireMasterProcessChannelProcessorFactory
      extends AbstractMasterProcessChannelProcessorFactory
  {
      private static final int FLUSH_PERIOD_MILLIS = 100;
      private volatile AsynchronousSocketChannel clientSocketChannel;
  
      @Override
      public boolean canUse( String channelConfig )
      {
          return channelConfig.startsWith( "tcp://" );
      }
  
      @Override
      public void connect( String channelConfig ) throws IOException
      {
          if ( !canUse( channelConfig ) )
          {
              throw new MalformedURLException( "Unknown channel string " + channelConfig );
          }
  
          try
          {
              URI uri = new URI( channelConfig );
              InetSocketAddress hostAddress = new InetSocketAddress( uri.getHost(), uri.getPort() );
              clientSocketChannel = open( withFixedThreadPool( 2, newDaemonThreadFactory() ) );
              setTrueOptions( SO_REUSEADDR, TCP_NODELAY, SO_KEEPALIVE );
              clientSocketChannel.connect( hostAddress ).get();
              String sessionId = extractSessionId( uri );
              if ( sessionId != null )
              {
                  ByteBuffer buff = ByteBuffer.wrap( sessionId.getBytes( US_ASCII ) );
                  while ( buff.hasRemaining() )
                  {
                      clientSocketChannel.write( buff ).get();
                  }
              }
          }
          catch ( URISyntaxException | InterruptedException e )
          {
              throw new IOException( e.getLocalizedMessage(), e );
          }
          catch ( ExecutionException e )
         {
             throw new IOException( e.getLocalizedMessage(), e.getCause() );
         }
     }
 
     @Override
     public MasterProcessChannelDecoder createDecoder( @Nonnull ForkNodeArguments forkingArguments )
     {
         ReadableByteChannel bufferedChannel = newBufferedChannel( newInputStream( clientSocketChannel ) );
         return new CommandChannelDecoder( bufferedChannel, forkingArguments );
     }
 
     @Override
     public MasterProcessChannelEncoder createEncoder( @Nonnull ForkNodeArguments forkingArguments )
     {
         WritableBufferedByteChannel channel = newBufferedChannel( newOutputStream( clientSocketChannel ) );
         schedulePeriodicFlusher( FLUSH_PERIOD_MILLIS, channel );
         return new EventChannelEncoder( channel );
     }
 
     @Override
     public void close() throws IOException
     {
         super.close();
         if ( clientSocketChannel != null && clientSocketChannel.isOpen() )
         {
             clientSocketChannel.close();
         }
     }
 
     @SafeVarargs
     private final void setTrueOptions( SocketOption<Boolean>... options )
         throws IOException
     {
         for ( SocketOption<Boolean> option : options )
         {
             if ( clientSocketChannel.supportedOptions().contains( option ) )
             {
                 clientSocketChannel.setOption( option, true );
             }
         }
     }
 
     private static String extractSessionId( URI uri )
     {
         String query = uri.getQuery();
         if ( query == null )
         {
             return null;
         }
         for ( StringTokenizer tokenizer = new StringTokenizer( query, "&" ); tokenizer.hasMoreTokens(); )
         {
             String token = tokenizer.nextToken();
             int delimiter = token.indexOf( '=' );
             if ( delimiter != -1 && "sessionId".equals( token.substring( 0, delimiter ) ) )
             {
                 return token.substring( delimiter + 1 );
             }
         }
         return null;
     }
 }