/*
 * 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.example.proxy;

import io.netty.channel.Channel;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;

public class HexDumpProxyBackendHandler implements ChannelHandler {

    private final Channel inboundChannel;

    public HexDumpProxyBackendHandler(Channel inboundChannel) {
        this.inboundChannel = inboundChannel;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        ctx.read();
    }

    @Override
    public void channelRead(final ChannelHandlerContext ctx, Object msg) {
        inboundChannel.writeAndFlush(msg).addListener((ChannelFutureListener) future -> {
            if (future.isSuccess()) {
                ctx.channel().read();
            } else {
                future.channel().close();
            }
        });
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) {
        HexDumpProxyFrontendHandler.closeOnFlush(inboundChannel);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        HexDumpProxyFrontendHandler.closeOnFlush(ctx.channel());
    }
}
