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Elasticsearch subproject :server

There is a newer version: 8.13.4

/*
 * 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;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.core.AbstractRefCounted;
import org.elasticsearch.core.CompletableContext;

/**
 * Abstract Transport.Connection that provides common close logic.
 */
public abstract class CloseableConnection extends AbstractRefCounted implements Transport.Connection {

    private final CompletableContext closeContext = new CompletableContext<>();
    private final CompletableContext removeContext = new CompletableContext<>();

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

    @Override
    public void addRemovedListener(ActionListener listener) {
        removeContext.addListener(ActionListener.toBiConsumer(listener));
    }

    @Override
    public boolean isClosed() {
        return closeContext.isDone();
    }

    @Override
    public void close() {
        // This method is safe to call multiple times as the close context will provide concurrency
        // protection and only be completed once. The attached listeners will only be notified once.
        closeContext.complete(null);
    }

    @Override
    public void onRemoved() {
        removeContext.complete(null);
    }

    @Override
    protected void closeInternal() {
        close();
    }
}