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   /*
    * Copyright 2016 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.kqueue;
  
  import io.netty.buffer.ByteBufAllocator;
  import io.netty.channel.ChannelException;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.MessageSizeEstimator;
  import io.netty.channel.RecvByteBufAllocator;
  import io.netty.channel.WriteBufferWaterMark;
  import io.netty.channel.socket.ServerSocketChannelConfig;
  import io.netty.util.internal.UnstableApi;
  
  import java.io.IOException;
  import java.util.Map;
  
  import static io.netty.channel.kqueue.KQueueChannelOption.SO_ACCEPTFILTER;
  import static io.netty.channel.unix.UnixChannelOption.SO_REUSEPORT;
  
  @UnstableApi
  public class KQueueServerSocketChannelConfig extends KQueueServerChannelConfig {
      KQueueServerSocketChannelConfig(KQueueServerSocketChannel channel) {
          super(channel);
  
          // Use SO_REUSEADDR by default as java.nio does the same.
          //
          // See https://github.com/netty/netty/issues/2605
          setReuseAddress(true);
      }
  
      @Override
      public Map<ChannelOption<?>, Object> getOptions() {
          return getOptions(super.getOptions(), SO_REUSEPORT, SO_ACCEPTFILTER);
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public <T> T getOption(ChannelOption<T> option) {
          if (option == SO_REUSEPORT) {
              return (T) Boolean.valueOf(isReusePort());
          }
          if (option == SO_ACCEPTFILTER) {
              return (T) getAcceptFilter();
          }
          return super.getOption(option);
      }
  
      @Override
      public <T> boolean setOption(ChannelOption<T> option, T value) {
          validate(option, value);
  
          if (option == SO_REUSEPORT) {
              setReusePort((Boolean) value);
          } else if (option == SO_ACCEPTFILTER) {
              setAcceptFilter((AcceptFilter) value);
          } else {
              return super.setOption(option, value);
          }
  
          return true;
      }
  
      public KQueueServerSocketChannelConfig setReusePort(boolean reusePort) {
          try {
              ((KQueueServerSocketChannel) channel).socket.setReusePort(reusePort);
              return this;
          } catch (IOException e) {
              throw new ChannelException(e);
          }
      }
  
      public boolean isReusePort() {
          try {
              return ((KQueueServerSocketChannel) channel).socket.isReusePort();
          } catch (IOException e) {
              throw new ChannelException(e);
          }
      }
  
      public KQueueServerSocketChannelConfig setAcceptFilter(AcceptFilter acceptFilter) {
          try {
              ((KQueueServerSocketChannel) channel).socket.setAcceptFilter(acceptFilter);
              return this;
          } catch (IOException e) {
              throw new ChannelException(e);
          }
     }
 
     public AcceptFilter getAcceptFilter() {
         try {
             return ((KQueueServerSocketChannel) channel).socket.getAcceptFilter();
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     @Override
     public KQueueServerSocketChannelConfig setRcvAllocTransportProvidesGuess(boolean transportProvidesGuess) {
         super.setRcvAllocTransportProvidesGuess(transportProvidesGuess);
         return this;
     }
 
     @Override
     public KQueueServerSocketChannelConfig setReuseAddress(boolean reuseAddress) {
         super.setReuseAddress(reuseAddress);
         return this;
     }
 
     @Override
     public KQueueServerSocketChannelConfig setReceiveBufferSize(int receiveBufferSize) {
         super.setReceiveBufferSize(receiveBufferSize);
         return this;
     }
 
     @Override
     public KQueueServerSocketChannelConfig setPerformancePreferences(int connectionTime, int latency, int bandwidth) {
         return this;
     }
 
     @Override
     public KQueueServerSocketChannelConfig setBacklog(int backlog) {
         super.setBacklog(backlog);
         return this;
     }
 
     @Override
     public KQueueServerSocketChannelConfig setTcpFastOpen(boolean enableTcpFastOpen) {
         super.setTcpFastOpen(enableTcpFastOpen);
         return this;
     }
 
     @Override
     public KQueueServerSocketChannelConfig setConnectTimeoutMillis(int connectTimeoutMillis) {
         super.setConnectTimeoutMillis(connectTimeoutMillis);
         return this;
     }
 
     @Override
     @Deprecated
     public KQueueServerSocketChannelConfig setMaxMessagesPerRead(int maxMessagesPerRead) {
         super.setMaxMessagesPerRead(maxMessagesPerRead);
         return this;
     }
 
     @Override
     public KQueueServerSocketChannelConfig setWriteSpinCount(int writeSpinCount) {
         super.setWriteSpinCount(writeSpinCount);
         return this;
     }
 
     @Override
     public KQueueServerSocketChannelConfig setAllocator(ByteBufAllocator allocator) {
         super.setAllocator(allocator);
         return this;
     }
 
     @Override
     public KQueueServerSocketChannelConfig setRecvByteBufAllocator(RecvByteBufAllocator allocator) {
         super.setRecvByteBufAllocator(allocator);
         return this;
     }
 
     @Override
     public KQueueServerSocketChannelConfig setAutoRead(boolean autoRead) {
         super.setAutoRead(autoRead);
         return this;
     }
 
     @Override
     @Deprecated
     public KQueueServerSocketChannelConfig setWriteBufferHighWaterMark(int writeBufferHighWaterMark) {
         super.setWriteBufferHighWaterMark(writeBufferHighWaterMark);
         return this;
     }
 
     @Override
     @Deprecated
     public KQueueServerSocketChannelConfig setWriteBufferLowWaterMark(int writeBufferLowWaterMark) {
         super.setWriteBufferLowWaterMark(writeBufferLowWaterMark);
         return this;
     }
 
     @Override
     public KQueueServerSocketChannelConfig setWriteBufferWaterMark(WriteBufferWaterMark writeBufferWaterMark) {
         super.setWriteBufferWaterMark(writeBufferWaterMark);
         return this;
     }
 
     @Override
     public KQueueServerSocketChannelConfig setMessageSizeEstimator(MessageSizeEstimator estimator) {
         super.setMessageSizeEstimator(estimator);
         return this;
     }
 }