Method makePins

bolt/common/caching/tests/SsdFileTest.cpp:142–168

Gets consecutive entries from file 'fileId' starting at 'startOffset' with sizes between 'minSize' and 'maxSize'. Sizes start at 'minSize' and double each time and go back to 'minSize' after exceeding 'maxSize'. This stops after the total size has exceeded 'totalSize'. The entries are returned as pins. The pins are exclusive for newly created entries and shared for existing ones. New entries are

  // existing ones. New entries are deterministically  initialized from 'fileId'
  // and the entry's offset.
  std::vector<CachePin> makePins(
      uint64_t fileId,
      uint64_t startOffset,
      int32_t minSize,
      int32_t maxSize,
      int64_t totalSize) {
    auto offset = startOffset;
    int64_t bytesFromCache = 0;
    auto size = minSize;
    std::vector<CachePin> pins;
    while (bytesFromCache < totalSize) {
      pins.push_back(
          cache_->findOrCreate(RawFileCacheKey{fileId, offset}, size, nullptr));
      bytesFromCache += size;
      EXPECT_FALSE(pins.back().empty());
      auto entry = pins.back().entry();
      if (entry && entry->isExclusive()) {
        initializeContents(fileId + offset, entry->data());
      }
      offset += size;
      size *= 2;
      if (size > maxSize) {
        size = minSize;
      }
    }
    return pins;
  }

  std::vector<SsdPin> pinAllRegions(const std::vector<TestEntry>& entries) {
    std::vector<SsdPin> pins;