/*
    * Copyright 2014 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:
    *
    *   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.
   */
  package io.netty.channel.epoll;
  
  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.socket.ServerSocketChannelConfig;
  
  import java.io.IOException;
  import java.net.InetAddress;
  import java.util.Map;
  
  public final class EpollServerSocketChannelConfig extends EpollServerChannelConfig
          implements ServerSocketChannelConfig {
  
      EpollServerSocketChannelConfig(EpollServerSocketChannel 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(), EpollChannelOption.SO_REUSEPORT, EpollChannelOption.IP_FREEBIND,
                  EpollChannelOption.TCP_DEFER_ACCEPT);
      }
  
      @SuppressWarnings("unchecked")
      @Override
      public <T> T getOption(ChannelOption<T> option) {
          if (option == EpollChannelOption.SO_REUSEPORT) {
              return (T) Boolean.valueOf(isReusePort());
          }
          if (option == EpollChannelOption.IP_FREEBIND) {
              return (T) Boolean.valueOf(isFreeBind());
          }
          if (option == EpollChannelOption.TCP_DEFER_ACCEPT) {
              return (T) Integer.valueOf(getTcpDeferAccept());
          }
          return super.getOption(option);
      }
  
      @Override
      public <T> boolean setOption(ChannelOption<T> option, T value) {
          validate(option, value);
  
          if (option == EpollChannelOption.SO_REUSEPORT) {
              setReusePort((Boolean) value);
          } else if (option == EpollChannelOption.IP_FREEBIND) {
              setFreeBind((Boolean) value);
          } else if (option == EpollChannelOption.TCP_MD5SIG) {
              @SuppressWarnings("unchecked")
              final Map<InetAddress, byte[]> m = (Map<InetAddress, byte[]>) value;
              setTcpMd5Sig(m);
          } else if (option == EpollChannelOption.TCP_DEFER_ACCEPT) {
              setTcpDeferAccept((Integer) value);
          } else {
              return super.setOption(option, value);
          }
  
          return true;
      }
  
      @Override
      public EpollServerSocketChannelConfig setReuseAddress(boolean reuseAddress) {
          super.setReuseAddress(reuseAddress);
          return this;
      }
  
      @Override
      public EpollServerSocketChannelConfig setReceiveBufferSize(int receiveBufferSize) {
          super.setReceiveBufferSize(receiveBufferSize);
          return this;
      }
  
      @Override
      public EpollServerSocketChannelConfig setPerformancePreferences(int connectionTime, int latency, int bandwidth) {
          return this;
      }
  
     @Override
     public EpollServerSocketChannelConfig setBacklog(int backlog) {
         super.setBacklog(backlog);
         return this;
     }
 
     @Override
     public EpollServerSocketChannelConfig setConnectTimeoutMillis(int connectTimeoutMillis) {
         super.setConnectTimeoutMillis(connectTimeoutMillis);
         return this;
     }
 
     @Override
     public EpollServerSocketChannelConfig setMaxMessagesPerRead(int maxMessagesPerRead) {
         super.setMaxMessagesPerRead(maxMessagesPerRead);
         return this;
     }
 
     @Override
     public EpollServerSocketChannelConfig setWriteSpinCount(int writeSpinCount) {
         super.setWriteSpinCount(writeSpinCount);
         return this;
     }
 
     @Override
     public EpollServerSocketChannelConfig setAllocator(ByteBufAllocator allocator) {
         super.setAllocator(allocator);
         return this;
     }
 
     @Override
     public EpollServerSocketChannelConfig setRecvByteBufAllocator(RecvByteBufAllocator allocator) {
         super.setRecvByteBufAllocator(allocator);
         return this;
     }
 
     @Override
     public EpollServerSocketChannelConfig setAutoRead(boolean autoRead) {
         super.setAutoRead(autoRead);
         return this;
     }
 
     @Override
     public EpollServerSocketChannelConfig setWriteBufferHighWaterMark(int writeBufferHighWaterMark) {
         super.setWriteBufferHighWaterMark(writeBufferHighWaterMark);
         return this;
     }
 
     @Override
     public EpollServerSocketChannelConfig setWriteBufferLowWaterMark(int writeBufferLowWaterMark) {
         super.setWriteBufferLowWaterMark(writeBufferLowWaterMark);
         return this;
     }
 
     @Override
     public EpollServerSocketChannelConfig setMessageSizeEstimator(MessageSizeEstimator estimator) {
         super.setMessageSizeEstimator(estimator);
         return this;
     }
 
     /**
      * Set the {@code TCP_MD5SIG} option on the socket. See {@code linux/tcp.h} for more details.
      * Keys can only be set on, not read to prevent a potential leak, as they are confidential.
      * Allowing them being read would mean anyone with access to the channel could get them.
      */
     public EpollServerSocketChannelConfig setTcpMd5Sig(Map<InetAddress, byte[]> keys) {
         try {
             ((EpollServerSocketChannel) channel).setTcpMd5Sig(keys);
             return this;
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     /**
      * Returns {@code true} if the SO_REUSEPORT option is set.
      */
     public boolean isReusePort() {
         try {
             return Native.isReusePort(channel.fd().intValue()) == 1;
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     /**
      * Set the SO_REUSEPORT option on the underlying Channel. This will allow to bind multiple
      * {@link EpollSocketChannel}s to the same port and so accept connections with multiple threads.
      *
      * Be aware this method needs be called before {@link EpollSocketChannel#bind(java.net.SocketAddress)} to have
      * any affect.
      */
     public EpollServerSocketChannelConfig setReusePort(boolean reusePort) {
         try {
             Native.setReusePort(channel.fd().intValue(), reusePort ? 1 : 0);
             return this;
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     /**
      * Returns {@code true} if <a href="http://man7.org/linux/man-pages/man7/ip.7.html">IP_FREEBIND</a> is enabled,
      * {@code false} otherwise.
      */
     public boolean isFreeBind() {
         try {
             return Native.isIpFreeBind(channel.fd().intValue()) != 0;
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     /**
      * If {@code true} is used <a href="http://man7.org/linux/man-pages/man7/ip.7.html">IP_FREEBIND</a> is enabled,
      * {@code false} for disable it. Default is disabled.
      */
     public EpollServerSocketChannelConfig setFreeBind(boolean freeBind) {
         try {
             Native.setIpFreeBind(channel.fd().intValue(), freeBind ? 1 : 0);
             return this;
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     /**
      * Set the {@code TCP_DEFER_ACCEPT} option on the socket. See {@code man 7 tcp} for more details.
      */
     public EpollServerSocketChannelConfig setTcpDeferAccept(int deferAccept) {
         try {
             channel.fd().setTcpDeferAccept(deferAccept);
             return this;
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 
     /**
      * Returns a positive value if <a href="http://linux.die.net/man/7/tcp">TCP_DEFER_ACCEPT</a> is enabled.
      */
     public int getTcpDeferAccept() {
         try {
             return channel.fd().getTcpDeferAccept();
         } catch (IOException e) {
             throw new ChannelException(e);
         }
     }
 }