// GPars - Groovy Parallel Systems
//
// Copyright © 2014 The original author or authors
//
// 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 groovyx.gpars.remote.netty;
import groovyx.gpars.remote.LocalHost;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
/**
* Represents client that connects to server
* @see NettyServer
*
* @author Rafal Slawik
*/
public class NettyClient {
private final EventLoopGroup workerGroup;
private final Bootstrap bootstrap;
private ChannelFuture channelFuture;
/**
* Creates client that connect to server on specified host and port.
* @param host the host where server listens on
* @param port the port that server listens on
*/
public NettyClient(LocalHost localHost, String host, int port, ConnectListener connectListener) {
workerGroup = new NioEventLoopGroup();
bootstrap = new Bootstrap();
bootstrap.group(workerGroup)
.channel(NioSocketChannel.class)
.handler(new NettyChannelInitializer(localHost, connectListener))
.option(ChannelOption.SO_KEEPALIVE, true)
.option(ChannelOption.TCP_NODELAY, true)
.remoteAddress(host, port);
}
/**
* Connects the client to server
* Note: method does not block
*/
public void start() {
if (channelFuture == null) {
channelFuture = bootstrap.connect();
channelFuture.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
future.channel().closeFuture().addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
workerGroup.shutdownGracefully();
}
});
}
});
}
}
/**
* Closes connection to server
* Note: method does not block
*/
public void stop() {
if (channelFuture == null) {
throw new IllegalStateException("Client has not been started");
}
channelFuture.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
future.channel().close();
}
});
}
}