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Netty 4 based transport implementation

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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the "Elastic License
 * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
 * Public License v 1"; you may not use this file except in compliance with, at
 * your election, the "Elastic License 2.0", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

package org.elasticsearch.transport.netty4;

import io.netty.channel.Channel;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.common.util.concurrent.ListenableFuture;
import org.elasticsearch.transport.TcpServerChannel;

import java.net.InetSocketAddress;

import static org.elasticsearch.transport.netty4.Netty4Utils.addListener;

public class Netty4TcpServerChannel implements TcpServerChannel {

    private final Channel channel;
    private final ListenableFuture closeContext = new ListenableFuture<>();

    Netty4TcpServerChannel(Channel channel) {
        this.channel = channel;
        addListener(this.channel.closeFuture(), closeContext);
    }

    @Override
    public InetSocketAddress getLocalAddress() {
        return (InetSocketAddress) channel.localAddress();
    }

    @Override
    public void close() {
        channel.close();
    }

    @Override
    public void addCloseListener(ActionListener listener) {
        closeContext.addListener(listener);
    }

    @Override
    public boolean isOpen() {
        return channel.isOpen();
    }

    @Override
    public String toString() {
        return "Netty4TcpChannel{localAddress=" + getLocalAddress() + '}';
    }
}