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RocksDB fat jar that contains .so files for linux32 and linux64 (glibc and musl-libc), jnilib files for Mac OSX, and a .dll for Windows x64.

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// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).

package org.rocksdb;

/**
 * Base class for comparators which will receive
 * ByteBuffer based access via org.rocksdb.DirectSlice
 * in their compare method implementation.
 *
 * ByteBuffer based slices perform better when large keys
 * are involved. When using smaller keys consider
 * using @see org.rocksdb.Comparator
 */
public abstract class DirectComparator extends AbstractComparator {

  public DirectComparator(final ComparatorOptions copt) {
    super(copt);
  }

  @Override
  protected long initializeNative(final long... nativeParameterHandles) {
    return createNewDirectComparator0(nativeParameterHandles[0]);
  }

  @Override
  final ComparatorType getComparatorType() {
    return ComparatorType.JAVA_DIRECT_COMPARATOR;
  }

  private native long createNewDirectComparator0(
      final long comparatorOptionsHandle);
}