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There is a newer version: 8.15.1

/*
 * 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.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.threadpool.ThreadPool;

public interface TransportResponseHandler extends Writeable.Reader {

    void handleResponse(T response);

    void handleException(TransportException exp);

    default String executor() {
        return ThreadPool.Names.SAME;
    }

    /**
     * Implementations of {@link TransportResponseHandler} that handles the empty response {@link TransportResponse.Empty}.
     */
    abstract class Empty implements TransportResponseHandler {
        @Override
        public final TransportResponse.Empty read(StreamInput in) {
            return TransportResponse.Empty.INSTANCE;
        }
    }
}