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There is a newer version: 8.14.0

/*
 * 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.rest.action;

import org.elasticsearch.rest.RestChannel;
import org.elasticsearch.rest.RestResponse;
import org.elasticsearch.xcontent.XContentBuilder;

/**
 * A REST action listener that builds an {@link XContentBuilder} based response.
 */
public abstract class RestBuilderListener extends RestResponseListener {

    public RestBuilderListener(RestChannel channel) {
        super(channel);
    }

    @Override
    public final RestResponse buildResponse(Response response) throws Exception {
        try (XContentBuilder builder = channel.newBuilder()) {
            final RestResponse restResponse = buildResponse(response, builder);
            assert assertBuilderClosed(builder);
            return restResponse;
        }
    }

    /**
     * Builds a response to send back over the channel. Implementors should ensure that they close the provided {@link XContentBuilder}
     * using the {@link XContentBuilder#close()} method.
     */
    public abstract RestResponse buildResponse(Response response, XContentBuilder builder) throws Exception;

    // pkg private method that we can override for testing
    boolean assertBuilderClosed(XContentBuilder xContentBuilder) {
        assert xContentBuilder.generator().isClosed() : "callers should ensure the XContentBuilder is closed themselves";
        return true;
    }
}