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proto rpc libs, compatible with proto-rpc-pro
There is a newer version: 0.3.5
/**
 *   Copyright 2010-2014 Peter Klauser
 *
 *   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 net.dongliu.prettypb.rpc.server;

import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.MessageToMessageDecoder;
import io.netty.handler.codec.compression.ZlibCodecFactory;
import io.netty.handler.codec.compression.ZlibWrapper;
import net.dongliu.prettypb.rpc.protocol.ConnectErrorCode;
import net.dongliu.prettypb.rpc.protocol.ConnectRequest;
import net.dongliu.prettypb.rpc.protocol.ConnectResponse;
import net.dongliu.prettypb.rpc.protocol.WirePayload;
import net.dongliu.prettypb.rpc.info.PeerInfo;
import net.dongliu.prettypb.rpc.utils.Handlers;
import net.dongliu.prettypb.runtime.ExtensionRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * The ServerConnectRequestHandler handles the receipt of ConnectRequest
 * client requests, and uses the RpcClientRegistry to try to
 * register new clients. If the RpcClientRegistry allows the connection,
 * this handler sends back a ConnectResponse to the client.
 *
 * @author Peter Klauser
 */
@Sharable
public class RequestHandler extends MessageToMessageDecoder {

    private static Logger logger = LoggerFactory.getLogger(RequestHandler.class);

    private final PeerInfo serverPeer;
    private final RpcServiceRegistry rpcServiceRegistry;
    /**
     * extension for rpc messages
     */
    private final ExtensionRegistry extensionRegistry;

    private final ThreadPoolExecutor rpcServiceExecutor;
    private final RpcServerChannelRegistry rpcServerChannelRegistry;

    public RequestHandler(PeerInfo serverPeer, RpcServiceRegistry rpcServiceRegistry,
                          ExtensionRegistry extensionRegistry,
                          ThreadPoolExecutor rpcServiceExecutor,
                          RpcServerChannelRegistry rpcServerChannelRegistry) {
        this.serverPeer = serverPeer;
        this.rpcServiceRegistry = rpcServiceRegistry;
        this.extensionRegistry = extensionRegistry;
        this.rpcServiceExecutor = rpcServiceExecutor;
        this.rpcServerChannelRegistry = rpcServerChannelRegistry;
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, WirePayload msg,
                          List