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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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:
    *
    * https://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.
   */
  package io.netty.channel.udt.nio;
  
  import com.barchart.udt.TypeUDT;
  import com.barchart.udt.nio.ServerSocketChannelUDT;
  import com.barchart.udt.nio.SocketChannelUDT;
  import io.netty.channel.ChannelException;
  import io.netty.channel.ChannelMetadata;
  import io.netty.channel.ChannelOutboundBuffer;
  import io.netty.util.internal.SocketUtils;
  import io.netty.channel.nio.AbstractNioMessageChannel;
  import io.netty.channel.udt.DefaultUdtServerChannelConfig;
  import io.netty.channel.udt.UdtChannel;
  import io.netty.channel.udt.UdtServerChannel;
  import io.netty.channel.udt.UdtServerChannelConfig;
  import io.netty.util.internal.logging.InternalLogger;
  import io.netty.util.internal.logging.InternalLoggerFactory;
  
  import java.net.InetSocketAddress;
  import java.net.SocketAddress;
  import java.util.List;
  
  import static java.nio.channels.SelectionKey.*;
  
  /**
   * Common base for Netty Byte/Message UDT Stream/Datagram acceptors.
   *
   * @deprecated The UDT transport is no longer maintained and will be removed.
   */
  @Deprecated
  public abstract class NioUdtAcceptorChannel extends AbstractNioMessageChannel implements UdtServerChannel {
  
      protected static final InternalLogger logger =
              InternalLoggerFactory.getInstance(NioUdtAcceptorChannel.class);
  
      private static final ChannelMetadata METADATA = new ChannelMetadata(false, 16);
  
      private final UdtServerChannelConfig config;
  
      protected NioUdtAcceptorChannel(final ServerSocketChannelUDT channelUDT) {
          super(null, channelUDT, OP_ACCEPT);
          try {
              channelUDT.configureBlocking(false);
              config = new DefaultUdtServerChannelConfig(this, channelUDT, true);
          } catch (final Exception e) {
              try {
                  channelUDT.close();
              } catch (final Exception e2) {
                  if (logger.isWarnEnabled()) {
                      logger.warn("Failed to close channel.", e2);
                  }
              }
              throw new ChannelException("Failed to configure channel.", e);
          }
      }
  
      protected NioUdtAcceptorChannel(final TypeUDT type) {
          this(NioUdtProvider.newAcceptorChannelUDT(type));
      }
  
      @Override
      public UdtServerChannelConfig config() {
          return config;
      }
  
      @Override
      protected void doBind(final SocketAddress localAddress) throws Exception {
          javaChannel().socket().bind(localAddress, config.getBacklog());
      }
  
      @Override
      protected void doClose() throws Exception {
          javaChannel().close();
      }
  
      @Override
      protected boolean doConnect(final SocketAddress remoteAddress,
              final SocketAddress localAddress) throws Exception {
          throw new UnsupportedOperationException();
      }
  
      @Override
      protected void doDisconnect() throws Exception {
          throw new UnsupportedOperationException();
      }
 
     @Override
     protected void doFinishConnect() throws Exception {
         throw new UnsupportedOperationException();
     }
 
     @Override
     protected boolean doWriteMessage(Object msg, ChannelOutboundBuffer in) throws Exception {
         throw new UnsupportedOperationException();
     }
 
     @Override
     protected final Object filterOutboundMessage(Object msg) throws Exception {
         throw new UnsupportedOperationException();
     }
 
     @Override
     public boolean isActive() {
         return javaChannel().socket().isBound();
     }
 
     @Override
     protected ServerSocketChannelUDT javaChannel() {
         return (ServerSocketChannelUDT) super.javaChannel();
     }
 
     @Override
     protected SocketAddress localAddress0() {
         return SocketUtils.localSocketAddress(javaChannel().socket());
     }
 
     @Override
     public InetSocketAddress localAddress() {
         return (InetSocketAddress) super.localAddress();
     }
 
     @Override
     public InetSocketAddress remoteAddress() {
         return null;
     }
 
     @Override
     protected SocketAddress remoteAddress0() {
         return null;
     }
 
     @Override
     public ChannelMetadata metadata() {
         return METADATA;
     }
 
     @Override
     protected int doReadMessages(List<Object> buf) throws Exception {
         final SocketChannelUDT channelUDT = (SocketChannelUDT) SocketUtils.accept(javaChannel());
         if (channelUDT == null) {
             return 0;
         } else {
             buf.add(newConnectorChannel(channelUDT));
             return 1;
         }
     }
 
     protected abstract UdtChannel newConnectorChannel(SocketChannelUDT channelUDT);
 }