reactor.ipc.netty.channel.NettyChannelHandler.java Source code

Introduction

Here is the source code for reactor.ipc.netty.channel.NettyChannelHandler.java

Source

/*
 * Copyright (c) 2011-2016 Pivotal Software Inc, All Rights Reserved.
 *
 * Licensed 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 reactor.ipc.netty.channel;

import io.netty.buffer.EmptyByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import reactor.core.Exceptions;
import reactor.ipc.netty.NettyInbound;
import reactor.ipc.netty.NettyOutbound;
import reactor.util.Logger;
import reactor.util.Loggers;

/**
 * Netty {@link io.netty.channel.ChannelInboundHandler} implementation that bridge data
 * via an IPC {@link NettyOutbound} and {@link NettyInbound}
 *
 * @author Stephane Maldini
 */
@ChannelHandler.Sharable
final class NettyChannelHandler extends ChannelDuplexHandler {

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

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        try {
            operations(ctx).onChannelComplete();
        } catch (Throwable err) {
            Exceptions.throwIfFatal(err);
            operations(ctx).onChannelError(err);
        } finally {
            ctx.fireChannelInactive();
        }
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        if (msg == null) {
            return;
        }
        try {
            if (msg == Unpooled.EMPTY_BUFFER || msg instanceof EmptyByteBuf) {
                return;
            }
            operations(ctx).onInboundNext(msg);
            ctx.fireChannelRead(msg);
        } catch (Throwable err) {
            Exceptions.throwIfFatal(err);
            operations(ctx).onChannelError(err);
        }
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        operations(ctx).afterInboundNext(ctx);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable err) throws Exception {
        Exceptions.throwIfFatal(err);
        if (log.isDebugEnabled()) {
            log.error("handler failure", err);
        }
        operations(ctx).onChannelError(err);
    }

    @Override
    public void write(final ChannelHandlerContext ctx, Object msg, final ChannelPromise promise) throws Exception {
        if (msg instanceof ChannelWriter) {
            @SuppressWarnings("unchecked")
            ChannelWriter dataWriter = (ChannelWriter) msg;
            operations(ctx).onOutboundWriter(ctx, dataWriter.writeStream, dataWriter.flushMode, promise);
        } else {
            ctx.write(msg, promise);
        }
    }

    final NettyOperations<?, ?> operations(ChannelHandlerContext ctx) {
        return ctx.channel().attr(NettyOperations.OPERATIONS_ATTRIBUTE_KEY).get();
    }

    //

    protected static final Logger log = Loggers.getLogger(NettyChannelHandler.class);

}