com.mastfrog.scamper.InboundBytesDecoder.java Source code

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Here is the source code for com.mastfrog.scamper.InboundBytesDecoder.java

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/*
 * Copyright (c) 2014 Tim Boudreau
 *
 * This file is part of Scamper.
 *
 * Scamper is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package com.mastfrog.scamper;

import com.mastfrog.scamper.codec.MessageCodec;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.channel.SimpleChannelInboundHandler;
import java.net.SocketAddress;

/**
 * Receives reads and writes of SCTP messages and decodes the message type.
 *
 * @author Tim Boudreau
 */
@Singleton
@Sharable
final class InboundBytesDecoder extends SimpleChannelInboundHandler<ByteBuf> {

    private final ErrorHandler errors;
    private final MessageCodec codec;
    private final Associations assoc;

    @Inject
    public InboundBytesDecoder(ErrorHandler errors, MessageCodec codec, Associations assoc) {
        this.errors = errors;
        this.codec = codec;
        this.assoc = assoc;
    }

    @Override
    public boolean isSharable() {
        return true;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        codec.onChannelActive(ctx);
    }

    @Override
    protected void messageReceived(ChannelHandlerContext ctx, ByteBuf sctpMsg) throws Exception {
        assoc.ensureRegistered(ctx);
        int sctpChannel = ctx.attr(InboundSctpMessageToByteBufDecoder.SCTP_CHANNEL_KEY).get();
        MessageTypeAndBuffer decoded = codec.decode(sctpMsg, ctx, sctpChannel);
        ctx.fireChannelRead(decoded);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        errors.onError(ctx, cause);
    }

    @Override
    public void close(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
        codec.onClose(ctx, promise);
    }

    @Override
    public void connect(ChannelHandlerContext ctx, SocketAddress remoteAddress, SocketAddress localAddress,
            ChannelPromise promise) throws Exception {
        codec.onConnect(ctx, remoteAddress, localAddress, promise);
    }

    @Override
    public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
        codec.onChannelUnregistered(ctx);
    }

    @Override
    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
        codec.onChannelRegistered(ctx);
    }
}