/*
 * 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.WriteBufferWaterMark;
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.IP_TRANSPARENT, 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.IP_TRANSPARENT) {
            return (T) Boolean.valueOf(isIpTransparent());
        }
        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.IP_TRANSPARENT) {
            setIpTransparent((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
    @Deprecated
    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
    @Deprecated
    public EpollServerSocketChannelConfig setWriteBufferHighWaterMark(int writeBufferHighWaterMark) {
        super.setWriteBufferHighWaterMark(writeBufferHighWaterMark);
        return this;
    }

    @Override
    @Deprecated
    public EpollServerSocketChannelConfig setWriteBufferLowWaterMark(int writeBufferLowWaterMark) {
        super.setWriteBufferLowWaterMark(writeBufferLowWaterMark);
        return this;
    }

    @Override
    public EpollServerSocketChannelConfig setWriteBufferWaterMark(WriteBufferWaterMark writeBufferWaterMark) {
        super.setWriteBufferWaterMark(writeBufferWaterMark);
        return this;
    }

    @Override
    public EpollServerSocketChannelConfig setMessageSizeEstimator(MessageSizeEstimator estimator) {
        super.setMessageSizeEstimator(estimator);
        return this;
    }

    
Set the TCP_MD5SIG option on the socket. See 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. /**
     * 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 true if the SO_REUSEPORT option is set. /**
     * Returns {@code true} if the SO_REUSEPORT option is set.
     */
    public boolean isReusePort() {
        try {
            return channel.socket.isReusePort();
        } catch (IOException e) {
            throw new ChannelException(e);
        }
    }

    
Set the SO_REUSEPORT option on the underlying Channel. This will allow to bind multiple EpollSocketChannels to the same port and so accept connections with multiple threads. Be aware this method needs be called before AbstractChannel.bind(SocketAddress) to have any affect. /**
     * 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 {
            channel.socket.setReusePort(reusePort);
            return this;
        } catch (IOException e) {
            throw new ChannelException(e);
        }
    }

    
Returns true if IP_FREEBIND is enabled, false otherwise. /**
     * 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 channel.socket.isIpFreeBind();
        } catch (IOException e) {
            throw new ChannelException(e);
        }
    }

    
If true is used IP_FREEBIND is enabled, false for disable it. Default is disabled. /**
     * 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 {
            channel.socket.setIpFreeBind(freeBind);
            return this;
        } catch (IOException e) {
            throw new ChannelException(e);
        }
    }

    
Returns true if IP_TRANSPARENT is enabled, false otherwise. /**
     * Returns {@code true} if <a href="http://man7.org/linux/man-pages/man7/ip.7.html">IP_TRANSPARENT</a> is enabled,
     * {@code false} otherwise.
     */
    public boolean isIpTransparent() {
        try {
            return channel.socket.isIpTransparent();
        } catch (IOException e) {
            throw new ChannelException(e);
        }
    }

    
If true is used IP_TRANSPARENT is enabled, false for disable it. Default is disabled. /**
     * If {@code true} is used <a href="http://man7.org/linux/man-pages/man7/ip.7.html">IP_TRANSPARENT</a> is enabled,
     * {@code false} for disable it. Default is disabled.
     */
    public EpollServerSocketChannelConfig setIpTransparent(boolean transparent) {
        try {
            channel.socket.setIpTransparent(transparent);
            return this;
        } catch (IOException e) {
            throw new ChannelException(e);
        }
    }

    
Set the TCP_DEFER_ACCEPT option on the socket. See man 7 tcp for more details. /**
     * 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.socket.setTcpDeferAccept(deferAccept);
            return this;
        } catch (IOException e) {
            throw new ChannelException(e);
        }
    }

    
Returns a positive value if TCP_DEFER_ACCEPT is enabled.
/**
     * 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.socket.getTcpDeferAccept();
        } catch (IOException e) {
            throw new ChannelException(e);
        }
    }
}