Method InsertIntoCache

be/src/kudu/util/file_cache.cc:129–139

Insert a pointer to an open file object into the file cache with the filename as the cache key. Returns a handle to the inserted entry. The handle always contains an open file.

  // Returns a handle to the inserted entry. The handle always contains an open
  // file.
  ScopedOpenedDescriptor<FileType> InsertIntoCache(void* file_ptr) const {
    // The allocated charge is always one byte. This is incorrect with respect
    // to memory tracking, but it's necessary if the cache capacity is to be
    // equivalent to the max number of fds.
    auto pending(cache()->Allocate(filename(), sizeof(file_ptr), 1));
    CHECK(pending);
    memcpy(cache()->MutableValue(&pending), &file_ptr, sizeof(file_ptr));
    return ScopedOpenedDescriptor<FileType>(
        this, cache()->Insert(std::move(pending),
                              file_cache_->eviction_cb_.get()));
  }

  // Retrieves a pointer to an open file object from the file cache with the
  // filename as the cache key.