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There is a newer version: 2.18.0

/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.apache.lucene.index;

import java.io.IOException;

/**
 * Allows pkg private access
 */
public class OneMergeHelper {
    private OneMergeHelper() {}

    public static String getSegmentName(MergePolicy.OneMerge merge) {
        return merge.info != null ? merge.info.info.name : "_na_";
    }

    /**
     * The current MB per second rate limit for this merge.
     **/
    public static double getMbPerSec(Thread thread, MergePolicy.OneMerge merge) {
        if (thread instanceof ConcurrentMergeScheduler.MergeThread) {
            return ((ConcurrentMergeScheduler.MergeThread) thread).rateLimiter.getMBPerSec();
        }
        assert false : "this is not merge thread";
        return Double.POSITIVE_INFINITY;
    }

    /**
     * Returns total bytes written by this merge.
     **/
    public static long getTotalBytesWritten(Thread thread, MergePolicy.OneMerge merge) throws IOException {
        /*
          TODO: The number of bytes written during the merge should be accessible in OneMerge.
         */
        if (thread instanceof ConcurrentMergeScheduler.MergeThread) {
            return ((ConcurrentMergeScheduler.MergeThread) thread).rateLimiter.getTotalBytesWritten();
        }
        assert false : "this is not merge thread";
        return merge.totalBytesSize();
    }

}