org.maxur.clitelnetclient.Sender.java Source code

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Here is the source code for org.maxur.clitelnetclient.Sender.java

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/*
 * Copyright (c) 2013 Maxim Yunusov
 *    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 org.maxur.clitelnetclient;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;

final class Sender {

    public static final String EOL = "\r\n";

    private final String host;

    private final int port;

    private final String command;

    Sender(final String host, final int port, final String command) {
        this.host = host;
        this.port = port;
        this.command = command;
    }

    void send() throws InterruptedException {
        final EventLoopGroup group = new NioEventLoopGroup();
        try {
            final Bootstrap bootstrap = new Bootstrap();
            bootstrap.group(group).channel(NioSocketChannel.class).handler(new TelnetClientInitializer());
            final Channel channel = bootstrap.connect(host, port).sync().channel();
            final ChannelFuture lastWriteFuture = channel.writeAndFlush(command + EOL);
            channel.closeFuture().sync();
            if (lastWriteFuture != null) {
                lastWriteFuture.sync();
            }
        } finally {
            group.shutdownGracefully();

        }
    }

}