| /* |
| * 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 |
| * |
| * https://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.avro.ipc.netty; |
| |
| import java.io.IOException; |
| import java.net.InetSocketAddress; |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import java.util.function.Consumer; |
| |
| import org.apache.avro.ipc.Responder; |
| import org.apache.avro.ipc.Server; |
| import org.apache.avro.ipc.netty.NettyTransportCodec.NettyDataPack; |
| import org.apache.avro.ipc.netty.NettyTransportCodec.NettyFrameDecoder; |
| import org.apache.avro.ipc.netty.NettyTransportCodec.NettyFrameEncoder; |
| import io.netty.bootstrap.ServerBootstrap; |
| import io.netty.channel.Channel; |
| import io.netty.channel.ChannelHandlerContext; |
| import io.netty.channel.ChannelInitializer; |
| import io.netty.channel.ChannelOption; |
| import io.netty.channel.DefaultEventLoopGroup; |
| import io.netty.channel.EventLoopGroup; |
| import io.netty.channel.SimpleChannelInboundHandler; |
| import io.netty.channel.nio.NioEventLoopGroup; |
| import io.netty.channel.socket.SocketChannel; |
| import io.netty.channel.socket.nio.NioServerSocketChannel; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A Netty-based RPC {@link Server} implementation. |
| */ |
| public class NettyServer implements Server { |
| private static final Logger LOG = LoggerFactory.getLogger(NettyServer.class.getName()); |
| |
| private final Responder responder; |
| |
| private final Channel serverChannel; |
| private final EventLoopGroup bossGroup; |
| private final EventLoopGroup workerGroup; |
| private final EventLoopGroup callerGroup; |
| private final CountDownLatch closed = new CountDownLatch(1); |
| private final AtomicInteger activeCount = new AtomicInteger(0); |
| |
| public NettyServer(Responder responder, InetSocketAddress addr) throws InterruptedException { |
| this(responder, addr, null); |
| } |
| |
| public NettyServer(Responder responder, InetSocketAddress addr, final Consumer<SocketChannel> initializer) |
| throws InterruptedException { |
| this(responder, addr, initializer, null, null, null, null); |
| } |
| |
| public NettyServer(Responder responder, InetSocketAddress addr, final Consumer<SocketChannel> initializer, |
| final Consumer<ServerBootstrap> bootStrapInitialzier) throws InterruptedException { |
| this(responder, addr, initializer, bootStrapInitialzier, null, null, null); |
| } |
| |
| public NettyServer(Responder responder, InetSocketAddress addr, final Consumer<SocketChannel> initializer, |
| final Consumer<ServerBootstrap> bootStrapInitialzier, EventLoopGroup bossGroup, EventLoopGroup workerGroup, |
| EventLoopGroup callerGroup) throws InterruptedException { |
| this.bossGroup = bossGroup == null ? new NioEventLoopGroup(1) : bossGroup; |
| this.workerGroup = workerGroup == null ? new NioEventLoopGroup(10) : workerGroup; |
| this.callerGroup = callerGroup == null ? new DefaultEventLoopGroup(16) : callerGroup; |
| this.responder = responder; |
| ServerBootstrap bootstrap = new ServerBootstrap().group(this.bossGroup, this.workerGroup) |
| .channel(NioServerSocketChannel.class).childHandler(new ChannelInitializer<SocketChannel>() { |
| @Override |
| public void initChannel(SocketChannel ch) throws Exception { |
| if (initializer != null) { |
| initializer.accept(ch); |
| } |
| ch.pipeline().addLast("frameDecoder", new NettyFrameDecoder()) |
| .addLast("frameEncoder", new NettyFrameEncoder()).addLast("handler", new NettyServerAvroHandler()); |
| } |
| }).option(ChannelOption.SO_BACKLOG, 1024).childOption(ChannelOption.TCP_NODELAY, true) |
| .childOption(ChannelOption.SO_KEEPALIVE, true); |
| |
| if (bootStrapInitialzier != null) { |
| bootStrapInitialzier.accept(bootstrap); |
| } |
| serverChannel = bootstrap.bind(addr).sync().channel(); |
| } |
| |
| @Override |
| public void start() { |
| // No-op. |
| } |
| |
| @Override |
| public void close() { |
| workerGroup.shutdownGracefully().syncUninterruptibly(); |
| bossGroup.shutdownGracefully().syncUninterruptibly(); |
| try { |
| serverChannel.closeFuture().sync(); |
| } catch (InterruptedException e) { |
| // TODO Auto-generated catch block |
| e.printStackTrace(); |
| } |
| closed.countDown(); |
| } |
| |
| @Override |
| public int getPort() { |
| return ((InetSocketAddress) serverChannel.localAddress()).getPort(); |
| } |
| |
| @Override |
| public void join() throws InterruptedException { |
| closed.await(); |
| } |
| |
| /** |
| * |
| * @return The number of clients currently connected to this server. |
| */ |
| public int getNumActiveConnections() { |
| return activeCount.get(); |
| } |
| |
| /** |
| * Avro server handler for the Netty transport |
| */ |
| class NettyServerAvroHandler extends SimpleChannelInboundHandler<NettyDataPack> { |
| |
| private NettyTransceiver connectionMetadata = new NettyTransceiver(); |
| |
| @Override |
| public void channelActive(ChannelHandlerContext ctx) throws Exception { |
| activeCount.incrementAndGet(); |
| super.channelActive(ctx); |
| } |
| |
| @Override |
| protected void channelRead0(ChannelHandlerContext ctx, final NettyDataPack dataPack) throws Exception { |
| callerGroup.submit(new Runnable() { |
| @Override |
| public void run() { |
| List<ByteBuffer> req = dataPack.getDatas(); |
| try { |
| List<ByteBuffer> res = responder.respond(req, connectionMetadata); |
| // response will be null for oneway messages. |
| if (res != null) { |
| dataPack.setDatas(res); |
| ctx.channel().writeAndFlush(dataPack); |
| } |
| } catch (IOException e) { |
| LOG.warn("unexpected error"); |
| } |
| } |
| }); |
| } |
| |
| @Override |
| public void exceptionCaught(ChannelHandlerContext ctx, Throwable e) { |
| LOG.warn("Unexpected exception from downstream.", e); |
| ctx.close().syncUninterruptibly(); |
| } |
| |
| @Override |
| public void channelInactive(ChannelHandlerContext ctx) throws Exception { |
| LOG.info("Connection to {} disconnected.", ctx.channel().remoteAddress()); |
| activeCount.decrementAndGet(); |
| super.channelInactive(ctx); |
| } |
| |
| } |
| } |