2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.netconf.nettyutil;
10 import static java.util.Objects.requireNonNull;
12 import io.netty.bootstrap.Bootstrap;
13 import io.netty.bootstrap.ServerBootstrap;
14 import io.netty.buffer.PooledByteBufAllocator;
15 import io.netty.channel.Channel;
16 import io.netty.channel.ChannelFuture;
17 import io.netty.channel.ChannelInitializer;
18 import io.netty.channel.ChannelOption;
19 import io.netty.channel.EventLoopGroup;
20 import io.netty.channel.ServerChannel;
21 import io.netty.channel.local.LocalServerChannel;
22 import io.netty.channel.socket.SocketChannel;
23 import io.netty.channel.socket.nio.NioServerSocketChannel;
24 import io.netty.channel.socket.nio.NioSocketChannel;
25 import io.netty.util.concurrent.DefaultPromise;
26 import io.netty.util.concurrent.EventExecutor;
27 import io.netty.util.concurrent.Future;
28 import io.netty.util.concurrent.GlobalEventExecutor;
29 import io.netty.util.concurrent.Promise;
30 import java.io.Closeable;
31 import java.net.InetSocketAddress;
32 import java.net.SocketAddress;
33 import org.opendaylight.netconf.api.NetconfSession;
34 import org.opendaylight.netconf.api.NetconfSessionListener;
35 import org.slf4j.Logger;
36 import org.slf4j.LoggerFactory;
39 * Dispatcher class for creating servers and clients. The idea is to first create servers and clients and the run the
40 * start method that will handle sockets in different thread.
43 public abstract class AbstractNetconfDispatcher<S extends NetconfSession, L extends NetconfSessionListener<? super S>>
44 implements Closeable {
46 protected interface ChannelPipelineInitializer<C extends Channel, S extends NetconfSession> {
48 * Initializes channel by specifying the handlers in its pipeline. Handlers are protocol specific, therefore
49 * this method needs to be implemented in protocol specific Dispatchers.
51 * @param channel whose pipeline should be defined, also to be passed to {@link NetconfSessionNegotiatorFactory}
52 * @param promise to be passed to {@link NetconfSessionNegotiatorFactory}
54 void initializeChannel(C channel, Promise<S> promise);
57 protected interface PipelineInitializer<S extends NetconfSession>
58 extends ChannelPipelineInitializer<SocketChannel, S> {
63 private static final Logger LOG = LoggerFactory.getLogger(AbstractNetconfDispatcher.class);
65 private final EventLoopGroup bossGroup;
67 private final EventLoopGroup workerGroup;
69 private final EventExecutor executor;
71 protected AbstractNetconfDispatcher(final EventLoopGroup bossGroup, final EventLoopGroup workerGroup) {
72 this(GlobalEventExecutor.INSTANCE, bossGroup, workerGroup);
75 protected AbstractNetconfDispatcher(final EventExecutor executor, final EventLoopGroup bossGroup,
76 final EventLoopGroup workerGroup) {
77 this.bossGroup = requireNonNull(bossGroup);
78 this.workerGroup = requireNonNull(workerGroup);
79 this.executor = requireNonNull(executor);
84 * Creates server. Each server needs factories to pass their instances to client sessions.
86 * @param address address to which the server should be bound
87 * @param initializer instance of PipelineInitializer used to initialize the channel pipeline
89 * @return ChannelFuture representing the binding process
91 protected ChannelFuture createServer(final InetSocketAddress address, final PipelineInitializer<S> initializer) {
92 return createServer(address, NioServerSocketChannel.class, initializer);
96 * Creates server. Each server needs factories to pass their instances to client sessions.
98 * @param address address to which the server should be bound
99 * @param channelClass The {@link Class} which is used to create {@link Channel} instances from.
100 * @param initializer instance of PipelineInitializer used to initialize the channel pipeline
102 * @return ChannelFuture representing the binding process
104 protected <C extends Channel> ChannelFuture createServer(final SocketAddress address,
105 final Class<? extends ServerChannel> channelClass, final ChannelPipelineInitializer<C, S> initializer) {
106 final ServerBootstrap b = new ServerBootstrap();
107 b.childHandler(new ChannelInitializer<C>() {
110 protected void initChannel(final C ch) {
111 initializer.initializeChannel(ch, new DefaultPromise<>(executor));
115 b.option(ChannelOption.SO_BACKLOG, 128);
116 if (LocalServerChannel.class.equals(channelClass) == false) {
117 // makes no sense for LocalServer and produces warning
118 b.childOption(ChannelOption.SO_KEEPALIVE, true);
119 b.childOption(ChannelOption.TCP_NODELAY , true);
121 b.childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT);
122 customizeBootstrap(b);
124 if (b.group() == null) {
125 b.group(bossGroup, workerGroup);
128 b.channel(channelClass);
129 } catch (final IllegalStateException e) {
130 // FIXME: if this is ok, document why
131 LOG.trace("Not overriding channelFactory on bootstrap {}", b, e);
134 // Bind and start to accept incoming connections.
135 final ChannelFuture f = b.bind(address);
136 LOG.debug("Initiated server {} at {}.", f, address);
141 * Customize a server bootstrap before the server is created. This allows
142 * subclasses to assign non-default server options before the server is
145 * @param bootstrap Server bootstrap
147 protected void customizeBootstrap(final ServerBootstrap bootstrap) {
148 // The default is a no-op
152 * Customize a client bootstrap before the connection is attempted. This
153 * allows subclasses to assign non-default options before the client is
156 * @param bootstrap Client bootstrap
158 protected void customizeBootstrap(final Bootstrap bootstrap) {
159 // The default is a no-op
165 * @param address remote address
166 * @param strategy Reconnection strategy to be used when initial connection fails
168 * @return Future representing the connection process. Its result represents the combined success of TCP connection
169 * as well as session negotiation.
171 protected Future<S> createClient(final InetSocketAddress address, final ReconnectStrategy strategy,
172 final PipelineInitializer<S> initializer) {
173 final Bootstrap b = new Bootstrap();
174 final NetconfSessionPromise<S> p = new NetconfSessionPromise<>(executor, address, strategy, b);
175 b.option(ChannelOption.SO_KEEPALIVE, true).handler(
176 new ChannelInitializer<SocketChannel>() {
178 protected void initChannel(final SocketChannel ch) {
179 initializer.initializeChannel(ch, p);
183 customizeBootstrap(b);
185 setChannelFactory(b);
188 LOG.debug("Client created.");
193 * Create a client but use a pre-configured bootstrap.
194 * This method however replaces the ChannelInitializer in the bootstrap. All other configuration is preserved.
196 * @param address remote address
198 protected Future<S> createClient(final InetSocketAddress address, final ReconnectStrategy strategy,
199 final Bootstrap bootstrap, final PipelineInitializer<S> initializer) {
200 final NetconfSessionPromise<S> p = new NetconfSessionPromise<>(executor, address, strategy, bootstrap);
203 new ChannelInitializer<SocketChannel>() {
205 protected void initChannel(final SocketChannel ch) {
206 initializer.initializeChannel(ch, p);
211 LOG.debug("Client created.");
218 * @param address remote address
219 * @param connectStrategyFactory Factory for creating reconnection strategy to be used when initial connection fails
220 * @param reestablishStrategy Reconnection strategy to be used when the already-established session fails
221 * @return Future representing the reconnection task. It will report completion based on reestablishStrategy, e.g.
222 * success if it indicates no further attempts should be made and failure if it reports an error
224 * {@link #createReconnectingClient(InetSocketAddress, ReconnectStrategyFactory, PipelineInitializer)}
228 protected Future<Void> createReconnectingClient(final InetSocketAddress address,
229 final ReconnectStrategyFactory connectStrategyFactory, final ReconnectStrategy reestablishStrategy,
230 final PipelineInitializer<S> initializer) {
231 return createReconnectingClient(address, connectStrategyFactory, initializer);
235 * Creates a reconnecting client.
237 * @param address remote address
238 * @param connectStrategyFactory Factory for creating reconnection strategy for every reconnect attempt
239 * @return Future representing the reconnection task. It will report completion based on reestablishStrategy, e.g.
240 * success is never reported, only failure when it runs out of reconnection attempts.
242 protected Future<Void> createReconnectingClient(final InetSocketAddress address,
243 final ReconnectStrategyFactory connectStrategyFactory, final PipelineInitializer<S> initializer) {
244 final Bootstrap b = new Bootstrap();
246 final ReconnectPromise<S, L> p = new ReconnectPromise<>(GlobalEventExecutor.INSTANCE, this, address,
247 connectStrategyFactory, b, initializer);
249 b.option(ChannelOption.SO_KEEPALIVE, true);
251 customizeBootstrap(b);
253 setChannelFactory(b);
259 private static void setChannelFactory(final Bootstrap bootstrap) {
260 // There is no way to detect if this was already set by
261 // customizeBootstrap()
263 bootstrap.channel(NioSocketChannel.class);
264 } catch (final IllegalStateException e) {
265 LOG.trace("Not overriding channelFactory on bootstrap {}", bootstrap, e);
269 private void setWorkerGroup(final Bootstrap bootstrap) {
270 if (bootstrap.group() == null) {
271 bootstrap.group(workerGroup);
277 public void close() {