com.googlecode.protobuf.pro.duplex.server.DuplexTcpServerPipelineFactory.java Source code

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/**
 *   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 com.googlecode.protobuf.pro.duplex.server;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.protobuf.ExtensionRegistry;
import com.googlecode.protobuf.pro.duplex.PeerInfo;
import com.googlecode.protobuf.pro.duplex.RpcClient;
import com.googlecode.protobuf.pro.duplex.RpcClientChannel;
import com.googlecode.protobuf.pro.duplex.RpcSSLContext;
import com.googlecode.protobuf.pro.duplex.RpcServer;
import com.googlecode.protobuf.pro.duplex.RpcServiceRegistry;
import com.googlecode.protobuf.pro.duplex.execute.RpcServerCallExecutor;
import com.googlecode.protobuf.pro.duplex.execute.SameThreadExecutor;
import com.googlecode.protobuf.pro.duplex.handler.Handler;
import com.googlecode.protobuf.pro.duplex.handler.RpcClientHandler;
import com.googlecode.protobuf.pro.duplex.handler.RpcServerHandler;
import com.googlecode.protobuf.pro.duplex.handler.ServerConnectRequestHandler;
import com.googlecode.protobuf.pro.duplex.listener.TcpConnectionEventListener;
import com.googlecode.protobuf.pro.duplex.logging.CategoryPerServiceLogger;
import com.googlecode.protobuf.pro.duplex.logging.RpcLogger;
import com.googlecode.protobuf.pro.duplex.wire.DuplexProtocol;

import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.compression.ZlibCodecFactory;
import io.netty.handler.codec.compression.ZlibWrapper;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender;
import io.netty.handler.ssl.SslHandler;

public class DuplexTcpServerPipelineFactory extends ChannelInitializer<Channel> {

    private static Logger log = LoggerFactory.getLogger(DuplexTcpServerPipelineFactory.class);

    private List<TcpConnectionEventListener> connectionEventListeners = new ArrayList<TcpConnectionEventListener>();

    private final PeerInfo serverInfo;
    private final RpcServiceRegistry rpcServiceRegistry = new RpcServiceRegistry();
    private final RpcClientRegistry rpcClientRegistry = new RpcClientRegistry();
    private RpcServerCallExecutor rpcServerCallExecutor = new SameThreadExecutor();
    private ExtensionRegistry extensionRegistry;
    private ExtensionRegistry wirelinePayloadExtensionRegistry;
    private RpcSSLContext sslContext;
    private RpcLogger logger = new CategoryPerServiceLogger();

    private final ServerConnectRequestHandler connectRequestHandler;

    public DuplexTcpServerPipelineFactory(PeerInfo serverInfo) {
        if (serverInfo == null) {
            throw new IllegalArgumentException("serverInfo");
        }
        this.serverInfo = serverInfo;
        this.connectRequestHandler = new ServerConnectRequestHandler(this);

        if (log.isDebugEnabled()) {
            log.debug("constructed " + serverInfo);
        }
    }

    @Override
    protected void initChannel(Channel ch) throws Exception {
        ChannelPipeline p = ch.pipeline();

        if (getSslContext() != null) {
            p.addLast(Handler.SSL, new SslHandler(getSslContext().createServerEngine()));
        }

        p.addLast(Handler.FRAME_DECODER, new ProtobufVarint32FrameDecoder());
        p.addLast(Handler.PROTOBUF_DECODER, new ProtobufDecoder(DuplexProtocol.WirePayload.getDefaultInstance(),
                getWirelinePayloadExtensionRegistry()));

        p.addLast(Handler.FRAME_ENCODER, new ProtobufVarint32LengthFieldPrepender());
        p.addLast(Handler.PROTOBUF_ENCODER, new ProtobufEncoder());

        p.addLast(Handler.SERVER_CONNECT, connectRequestHandler); // one instance shared by all channels

        if (log.isDebugEnabled()) {
            log.debug("initChannel " + ch);
        }
    }

    public RpcClientHandler completePipeline(RpcClient rpcClient) {
        ChannelPipeline p = rpcClient.getChannel().pipeline();

        if (rpcClient.isCompression()) {
            p.addBefore(Handler.FRAME_DECODER, Handler.COMPRESSOR,
                    ZlibCodecFactory.newZlibEncoder(ZlibWrapper.GZIP));
            p.addAfter(Handler.COMPRESSOR, Handler.DECOMPRESSOR, ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
        }

        TcpConnectionEventListener informer = new TcpConnectionEventListener() {
            @Override
            public void connectionClosed(RpcClientChannel client) {
                for (TcpConnectionEventListener listener : getListenersCopy()) {
                    listener.connectionClosed(client);
                }
            }

            @Override
            public void connectionOpened(RpcClientChannel client) {
                for (TcpConnectionEventListener listener : getListenersCopy()) {
                    listener.connectionOpened(client);
                }
            }
        };

        RpcClientHandler rpcClientHandler = new RpcClientHandler(rpcClient, informer);
        p.replace(Handler.SERVER_CONNECT, Handler.RPC_CLIENT, rpcClientHandler);

        RpcServer rpcServer = new RpcServer(rpcClient, getRpcServiceRegistry(), getRpcServerCallExecutor(),
                getLogger());
        RpcServerHandler rpcServerHandler = new RpcServerHandler(rpcServer, getRpcClientRegistry());
        p.addAfter(Handler.RPC_CLIENT, Handler.RPC_SERVER, rpcServerHandler);

        if (log.isDebugEnabled()) {
            log.debug("completed Pipeline to " + rpcClient.getPeerInfo());
        }
        return rpcClientHandler;
    }

    @Override
    public String toString() {
        return "DuplexTcpServerPipelineFactory:" + serverInfo;
    }

    public List<TcpConnectionEventListener> getListenersCopy() {
        List<TcpConnectionEventListener> copy = new ArrayList<TcpConnectionEventListener>();
        copy.addAll(getConnectionEventListeners());

        return Collections.unmodifiableList(copy);
    }

    public void registerConnectionEventListener(TcpConnectionEventListener listener) {
        getConnectionEventListeners().add(listener);
    }

    public void removeConnectionEventListener(TcpConnectionEventListener listener) {
        getConnectionEventListeners().remove(listener);
    }

    /**
     * @return the connectionEventListeners
     */
    public List<TcpConnectionEventListener> getConnectionEventListeners() {
        if (connectionEventListeners == null) {
            return new ArrayList<TcpConnectionEventListener>(0);
        }
        return connectionEventListeners;
    }

    /**
     * @param connectionEventListeners the connectionEventListeners to set
     */
    public void setConnectionEventListeners(List<TcpConnectionEventListener> connectionEventListeners) {
        this.connectionEventListeners = connectionEventListeners;
    }

    /**
     * @return the rpcServiceRegistry
     */
    public RpcServiceRegistry getRpcServiceRegistry() {
        return rpcServiceRegistry;
    }

    /**
     * @return the rpcClientRegistry
     */
    public RpcClientRegistry getRpcClientRegistry() {
        return rpcClientRegistry;
    }

    /**
     * @return the serverInfo
     */
    public PeerInfo getServerInfo() {
        return serverInfo;
    }

    /**
     * @return the sslContext
     */
    public RpcSSLContext getSslContext() {
        return sslContext;
    }

    /**
     * @param sslContext the sslContext to set
     */
    public void setSslContext(RpcSSLContext sslContext) {
        this.sslContext = sslContext;
    }

    /**
     * @return the registered extension registry.
     */
    public ExtensionRegistry getExtensionRegistry() {
        return extensionRegistry;
    }

    /**
     * Set the extension registry.
     * 
     * @param extensionRegistry
     */
    public void setExtensionRegistry(ExtensionRegistry extensionRegistry) {
        this.extensionRegistry = extensionRegistry;
    }

    /**
     * @return the registered WirelinePayload's extension registry.
     */
    public ExtensionRegistry getWirelinePayloadExtensionRegistry() {
        return wirelinePayloadExtensionRegistry;
    }

    /**
     * Set the WirelinePayload's extension registry.
     * 
     * @param wirelinePayloadExtensionRegistry
     */
    public void setWirelinePayloadExtensionRegistry(ExtensionRegistry wirelinePayloadExtensionRegistry) {
        this.wirelinePayloadExtensionRegistry = wirelinePayloadExtensionRegistry;
    }

    /**
     * @return the logger
     */
    public RpcLogger getLogger() {
        return logger;
    }

    /**
     * @param logger the logger to set
     */
    public void setLogger(RpcLogger logger) {
        this.logger = logger;
    }

    /**
     * @return the rpcServerCallExecutor
     */
    public RpcServerCallExecutor getRpcServerCallExecutor() {
        return rpcServerCallExecutor;
    }

    /**
     * @param rpcServerCallExecutor the rpcServerCallExecutor to set
     */
    public void setRpcServerCallExecutor(RpcServerCallExecutor rpcServerCallExecutor) {
        this.rpcServerCallExecutor = rpcServerCallExecutor;
    }
}