bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/BookieRequestHandler.java

/**
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 org.apache.bookkeeper.proto;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.group.ChannelGroup;

import java.nio.channels.ClosedChannelException;

import org.apache.bookkeeper.conf.ServerConfiguration;
import org.apache.bookkeeper.processor.RequestProcessor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Serverside handler for bookkeeper requests.
 */
class BookieRequestHandler extends ChannelInboundHandlerAdapter {

    private static final Logger LOG = LoggerFactory.getLogger(BookieRequestHandler.class);
    private final RequestProcessor requestProcessor;
    private final ChannelGroup allChannels;

    BookieRequestHandler(ServerConfiguration conf, RequestProcessor processor, ChannelGroup allChannels) {
        this.requestProcessor = processor;
        this.allChannels = allChannels;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        LOG.info("Channel connected  {}", ctx.channel());
        super.channelActive(ctx);
    }

    @Override
    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
        allChannels.add(ctx.channel());
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        LOG.info("Channels disconnected: {}", ctx.channel());
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        if (cause instanceof ClosedChannelException) {
            LOG.info("Client died before request could be completed", cause);
            return;
        }
        LOG.error("Unhandled exception occurred in I/O thread or handler", cause);
        ctx.close();
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        if (!(msg instanceof BookkeeperProtocol.Request || msg instanceof BookieProtocol.Request)) {
            ctx.fireChannelRead(msg);
            return;
        }
        requestProcessor.processRequest(msg, ctx.channel());
    }
}