| /** |
| * 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.tajo.rpc; |
| |
| import io.netty.channel.ChannelFuture; |
| import io.netty.channel.ChannelFutureListener; |
| import io.netty.channel.ChannelHandlerContext; |
| import io.netty.channel.EventLoopGroup; |
| import io.netty.util.internal.logging.CommonsLoggerFactory; |
| import io.netty.util.internal.logging.InternalLoggerFactory; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import javax.annotation.concurrent.ThreadSafe; |
| import java.net.ConnectException; |
| import java.net.InetSocketAddress; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Properties; |
| |
| @ThreadSafe |
| public class RpcClientManager { |
| private static final Log LOG = LogFactory.getLog(RpcClientManager.class); |
| |
| /* entries will be removed by ConnectionCloseFutureListener */ |
| private static final Map<RpcConnectionKey, NettyClientBase> |
| clients = Collections.synchronizedMap(new HashMap<RpcConnectionKey, NettyClientBase>()); |
| |
| private static RpcClientManager instance; |
| |
| static { |
| InternalLoggerFactory.setDefaultFactory(new CommonsLoggerFactory()); |
| instance = new RpcClientManager(); |
| } |
| |
| private RpcClientManager() { |
| } |
| |
| public static RpcClientManager getInstance() { |
| return instance; |
| } |
| |
| private <T extends NettyClientBase> T makeClient(RpcConnectionKey rpcConnectionKey, |
| Properties rpcParams) |
| throws NoSuchMethodException, ConnectException, ClassNotFoundException { |
| |
| |
| return makeClient(NettyUtils.getDefaultEventLoopGroup(), rpcConnectionKey, rpcParams); |
| } |
| |
| private <T extends NettyClientBase> T makeClient(EventLoopGroup eventLoopGroup, |
| RpcConnectionKey rpcConnectionKey, |
| Properties rpcParams) |
| throws NoSuchMethodException, ClassNotFoundException, ConnectException { |
| NettyClientBase client; |
| if (rpcConnectionKey.asyncMode) { |
| client = new AsyncRpcClient(eventLoopGroup, rpcConnectionKey, rpcParams); |
| |
| } else { |
| client = new BlockingRpcClient(eventLoopGroup, rpcConnectionKey, rpcParams); |
| } |
| return (T) client; |
| } |
| |
| /** |
| * Connect a {@link NettyClientBase} to the remote {@link NettyServerBase}, and returns rpc client by protocol. |
| * This client will be shared per protocol and address. Client is removed in shared map when a client is closed |
| */ |
| public <T extends NettyClientBase> T getClient(InetSocketAddress addr, |
| Class<?> protocolClass, |
| boolean asyncMode, |
| Properties rpcParams) |
| throws NoSuchMethodException, ClassNotFoundException, ConnectException { |
| RpcConnectionKey key = new RpcConnectionKey(addr, protocolClass, asyncMode); |
| |
| NettyClientBase client; |
| synchronized (clients) { |
| client = clients.get(key); |
| if (client == null) { |
| clients.put(key, client = makeClient(key, rpcParams)); |
| } |
| } |
| |
| if (!client.isConnected()) { |
| |
| final NettyClientBase target = client; |
| client.subscribeEvent(target.getKey(), new ChannelEventListener() { |
| @Override |
| public void channelRegistered(ChannelHandlerContext ctx) { |
| /* Register client to managed map */ |
| clients.put(target.getKey(), target); |
| ctx.channel().closeFuture().addListener(new ClientCloseFutureListener(target.getKey())); |
| } |
| |
| @Override |
| public void channelUnregistered(ChannelHandlerContext ctx) { |
| // nothing to do |
| } |
| }); |
| } |
| |
| client.connect(); |
| assert client.isConnected(); |
| return (T) client; |
| } |
| |
| /** |
| * Connect a {@link NettyClientBase} to the remote {@link NettyServerBase}, and returns rpc client by protocol. |
| * This client does not managed. It should close. |
| */ |
| public <T extends NettyClientBase> T newClient(InetSocketAddress addr, |
| Class<?> protocolClass, |
| boolean asyncMode, |
| Properties rpcParams) |
| throws NoSuchMethodException, ClassNotFoundException, ConnectException { |
| |
| return newClient(new RpcConnectionKey(addr, protocolClass, asyncMode), rpcParams); |
| } |
| |
| /** |
| * |
| * @param key RpcConnectionKey |
| * @param <T> Rpc Protocol Class |
| * @return Rpc Client Class |
| * @throws NoSuchMethodException |
| * @throws ClassNotFoundException |
| * @throws ConnectException |
| */ |
| public synchronized <T extends NettyClientBase> T newClient(RpcConnectionKey key, |
| Properties connectionParameters) |
| |
| throws NoSuchMethodException, ClassNotFoundException, ConnectException { |
| |
| T client = makeClient(key, connectionParameters); |
| client.connect(); |
| assert client.isConnected(); |
| return client; |
| } |
| |
| public synchronized <T extends NettyClientBase> T newBlockingClient(InetSocketAddress addr, |
| Class<?> protocolClass, |
| EventLoopGroup eventLoopGroup, |
| Properties rpcParams) |
| throws NoSuchMethodException, ClassNotFoundException, ConnectException { |
| |
| T client = makeClient(eventLoopGroup, new RpcConnectionKey(addr, protocolClass, false), rpcParams); |
| client.connect(); |
| assert client.isConnected(); |
| return client; |
| } |
| |
| /** |
| * Request to close this clients |
| * After it is closed, it is removed from clients map. |
| */ |
| public static void close() { |
| LOG.info("Closing RPC client manager"); |
| |
| synchronized (clients) { |
| for (NettyClientBase eachClient : clients.values()) { |
| try { |
| eachClient.close(); |
| } catch (Exception e) { |
| LOG.error(e.getMessage(), e); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Close client manager and shutdown Netty RPC worker pool |
| * After it is shutdown it is not possible to reuse it again. |
| */ |
| public static void shutdown() { |
| NettyUtils.shutdownGracefully(); |
| } |
| |
| protected static boolean contains(RpcConnectionKey key) { |
| return clients.containsKey(key); |
| } |
| |
| public static void cleanup(NettyClientBase... clients) { |
| for (NettyClientBase client : clients) { |
| if (client != null) { |
| try { |
| client.close(); |
| } catch (Exception e) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Exception in closing " + client.getKey(), e); |
| } |
| } |
| } |
| } |
| } |
| |
| static class ClientCloseFutureListener implements ChannelFutureListener { |
| private RpcConnectionKey key; |
| |
| public ClientCloseFutureListener(RpcConnectionKey key) { |
| this.key = key; |
| } |
| |
| @Override |
| public void operationComplete(ChannelFuture future) throws Exception { |
| clients.remove(key); |
| } |
| } |
| } |