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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:
 *
 *   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.bootstrap;

import io.netty.buffer.MessageBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundMessageHandler;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelStateHandlerAdapter;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.ServerChannel;
import io.netty.channel.socket.SocketChannel;
import io.netty.util.AttributeKey;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import java.net.SocketAddress;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;

/**
 * {@link Bootstrap} sub-class which allows easy bootstrap of {@link ServerChannel}
 *
 */
public final class ServerBootstrap extends AbstractBootstrap {

    private static final InternalLogger logger = InternalLoggerFactory.getInstance(ServerBootstrap.class);

    private final Map, Object> childOptions = new LinkedHashMap, Object>();
    private final Map, Object> childAttrs = new LinkedHashMap, Object>();
    private volatile EventLoopGroup childGroup;
    private volatile ChannelHandler childHandler;

    public ServerBootstrap() { }

    private ServerBootstrap(ServerBootstrap bootstrap) {
        super(bootstrap);
        childGroup = bootstrap.childGroup;
        childHandler = bootstrap.childHandler;
        synchronized (bootstrap.childOptions) {
            childOptions.putAll(bootstrap.childOptions);
        }
        synchronized (bootstrap.childAttrs) {
            childAttrs.putAll(bootstrap.childAttrs);
        }
    }

    /**
     * Specify the {@link EventLoopGroup} which is used for the parent (acceptor) and the child (client).
     */
    @Override
    public ServerBootstrap group(EventLoopGroup group) {
        return group(group, group);
    }

    /**
     * Set the {@link EventLoopGroup} for the parent (acceptor) and the child (client). These
     * {@link EventLoopGroup}'s are used to handle all the events and IO for {@link SocketChannel} and
     * {@link Channel}'s.
     */
    public ServerBootstrap group(EventLoopGroup parentGroup, EventLoopGroup childGroup) {
        super.group(parentGroup);
        if (childGroup == null) {
            throw new NullPointerException("childGroup");
        }
        if (this.childGroup != null) {
            throw new IllegalStateException("childGroup set already");
        }
        this.childGroup = childGroup;
        return this;
    }

    /**
     * Allow to specify a {@link ChannelOption} which is used for the {@link Channel} instances once they get created
     * (after the acceptor accepted the {@link Channel}). Use a value of {@code null} to remove a previous set
     * {@link ChannelOption}.
     */
    public  ServerBootstrap childOption(ChannelOption childOption, T value) {
        if (childOption == null) {
            throw new NullPointerException("childOption");
        }
        if (value == null) {
            synchronized (childOptions) {
                childOptions.remove(childOption);
            }
        } else {
            synchronized (childOptions) {
                childOptions.put(childOption, value);
            }
        }
        return this;
    }

    /**
     * Set the specific {@link AttributeKey} with the given value on every child {@link Channel}. If the value is
     * {@code null} the {@link AttributeKey} is removed
     */
    public  ServerBootstrap childAttr(AttributeKey childKey, T value) {
        if (childKey == null) {
            throw new NullPointerException("childKey");
        }
        if (value == null) {
            childAttrs.remove(childKey);
        } else {
            childAttrs.put(childKey, value);
        }
        return this;
    }

    /**
     * Set the {@link ChannelHandler} which is used to serve the request for the {@link Channel}'s.
     */
    public ServerBootstrap childHandler(ChannelHandler childHandler) {
        if (childHandler == null) {
            throw new NullPointerException("childHandler");
        }
        this.childHandler = childHandler;
        return this;
    }

    @Override
    ChannelFuture doBind(SocketAddress localAddress) {
        Channel channel = channelFactory().newChannel();

        try {
            final Map, Object> options = options();
            synchronized (options) {
                channel.config().setOptions(options);
            }
        } catch (Exception e) {
            channel.close();
            return channel.newFailedFuture(e);
        }

        final Map, Object> attrs = attrs();
        synchronized (attrs) {
            for (Entry, Object> e: attrs.entrySet()) {
                @SuppressWarnings("unchecked")
                AttributeKey key = (AttributeKey) e.getKey();
                channel.attr(key).set(e.getValue());
            }
        }

        ChannelPipeline p = channel.pipeline();
        if (handler() != null) {
            p.addLast(handler());
        }

        final EventLoopGroup currentChildGroup = childGroup;
        final ChannelHandler currentChildHandler = childHandler;
        final Entry, Object>[] currentChildOptions;
        final Entry, Object>[] currentChildAttrs;
        synchronized (childOptions) {
            currentChildOptions = childOptions.entrySet().toArray(newOptionArray(childOptions.size()));
        }
        synchronized (childAttrs) {
            currentChildAttrs = childAttrs.entrySet().toArray(newAttrArray(childAttrs.size()));
        }

        p.addLast(new ChannelInitializer() {
            @Override
            public void initChannel(Channel ch) throws Exception {
                ch.pipeline().addLast(new ServerBootstrapAcceptor(
                        currentChildGroup, currentChildHandler, currentChildOptions, currentChildAttrs));
            }
        });

        ChannelFuture f = group().register(channel).awaitUninterruptibly();
        if (!f.isSuccess()) {
            return f;
        }

        return channel.bind(localAddress).addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
    }

    @Override
    public void shutdown() {
        super.shutdown();
        if (childGroup != null) {
            childGroup.shutdown();
        }
    }

    @Override
    public ServerBootstrap validate() {
        super.validate();
        if (childHandler == null) {
            throw new IllegalStateException("childHandler not set");
        }
        if (childGroup == null) {
            logger.warn("childGroup is not set. Using parentGroup instead.");
            childGroup = group();
        }
        return this;
    }

    @SuppressWarnings("unchecked")
    private static Entry, Object>[] newOptionArray(int size) {
        return new Entry[size];
    }

    @SuppressWarnings("unchecked")
    private static Entry, Object>[] newAttrArray(int size) {
        return new Entry[size];
    }

    private static class ServerBootstrapAcceptor
            extends ChannelStateHandlerAdapter implements ChannelInboundMessageHandler {

        private final EventLoopGroup childGroup;
        private final ChannelHandler childHandler;
        private final Entry, Object>[] childOptions;
        private final Entry, Object>[] childAttrs;

        @SuppressWarnings("unchecked")
        ServerBootstrapAcceptor(
                EventLoopGroup childGroup, ChannelHandler childHandler,
                Entry, Object>[] childOptions, Entry, Object>[] childAttrs) {
            this.childGroup = childGroup;
            this.childHandler = childHandler;
            this.childOptions = childOptions;
            this.childAttrs = childAttrs;
        }

        @Override
        public MessageBuf newInboundBuffer(ChannelHandlerContext ctx) throws Exception {
            return Unpooled.messageBuffer();
        }

        @Override
        @SuppressWarnings("unchecked")
        public void inboundBufferUpdated(ChannelHandlerContext ctx) {
            MessageBuf in = ctx.inboundMessageBuffer();
            for (;;) {
                Channel child = in.poll();
                if (child == null) {
                    break;
                }

                child.pipeline().addLast(childHandler);

                for (Entry, Object> e: childOptions) {
                    try {
                        if (!child.config().setOption((ChannelOption) e.getKey(), e.getValue())) {
                            logger.warn("Unknown channel option: " + e);
                        }
                    } catch (Throwable t) {
                        logger.warn("Failed to set a channel option: " + child, t);
                    }
                }

                for (Entry, Object> e: childAttrs) {
                    child.attr((AttributeKey) e.getKey()).set(e.getValue());
                }

                try {
                    childGroup.register(child);
                } catch (Throwable t) {
                    child.unsafe().closeForcibly();
                    logger.warn("Failed to register an accepted channel: " + child, t);
                }
            }
        }

        @Override
        public void freeInboundBuffer(ChannelHandlerContext ctx) throws Exception {
            ctx.inboundMessageBuffer().release();
        }
    }

    @Override
    @SuppressWarnings("CloneDoesntCallSuperClone")
    public ServerBootstrap clone() {
        return new ServerBootstrap(this);
    }

    @Override
    public String toString() {
        StringBuilder buf = new StringBuilder(super.toString());
        buf.setLength(buf.length() - 1);
        buf.append(", ");
        if (childGroup != null) {
            buf.append("childGroup: ");
            buf.append(childGroup.getClass().getSimpleName());
            buf.append(", ");
        }
        synchronized (childOptions) {
            if (!childOptions.isEmpty()) {
                buf.append("childOptions: ");
                buf.append(childOptions);
                buf.append(", ");
            }
        }
        synchronized (childAttrs) {
            if (!childAttrs.isEmpty()) {
                buf.append("childAttrs: ");
                buf.append(childAttrs);
                buf.append(", ");
            }
        }
        if (childHandler != null) {
            buf.append("childHandler: ");
            buf.append(childHandler);
            buf.append(", ");
        }
        if (buf.charAt(buf.length() - 1) == '(') {
            buf.append(')');
        } else {
            buf.setCharAt(buf.length() - 2, ')');
            buf.setLength(buf.length() - 1);
        }

        return buf.toString();
    }
}
    

    

    
            
    
            







    
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