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Netty 4 based transport implementation

There is a newer version: 8.17.0

/*
 * 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 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 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;

public class Netty4TcpServerChannel implements TcpServerChannel {

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

    Netty4TcpServerChannel(Channel channel) {
        this.channel = channel;
        Netty4TcpChannel.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() + '}';
    }
}