Method cacheRanges

c++/src/Reader.cc:1815–1821

  }

  void FileContents::cacheRanges(std::vector<ReadRange> ranges) {
    std::lock_guard<std::mutex> lock(readCacheMutex);
    if (!readCache) {
      readCache = std::make_shared<ReadRangeCache>(stream.get(), cacheOptions, pool, readerMetrics);
    }
    readCache->cache(std::move(ranges));
  }

  void FileContents::evictCache(uint64_t boundary) {
    std::lock_guard<std::mutex> lock(readCacheMutex);