Method Open

src/leveldb/persistent_cache/persistent_cache_impl.cc:167–211

}

Status PersistentCacheImpl::Open() {
  Status status;

  assert(!size_.Get());

  // Check the validity of the options
  status = opt_.ValidateSettings();
  assert(status.ok());
  if (!status.ok()) {
    LEVELDB_LOG("Invalid persistent cache options.\n");
    return status;
  }

  // Create base directory
  status = opt_.env->CreateDir(opt_.path);
  if (!status.ok()) {
    LEVELDB_LOG("Error creating directory %s. %s.\n", opt_.path.c_str(), status.ToString().c_str());
    return status;
  }

  // Create meta directory
  status = opt_.env->CreateDir(GetMetaPath());
  assert(status.ok());
  if (!status.ok()) {
    LEVELDB_LOG("Error creating directory %s. %s.\n", GetMetaPath().c_str(),
                status.ToString().c_str());
    return status;
  }

  status = metadata_.Init(&writer_cache_id_, this);
  if (!status.ok()) {
    LEVELDB_LOG("Init metadata failed, reason: %s.\n", status.ToString().c_str());
    return status;
  }
  metadata_size_.Set(metadata_.GetDBSize());
  if (opt_.transfer_flash_env_files) {
    PullEnvFlashFiles();
  }
  // Clean up non-cache file
  CleanupCacheFolder(GetCachePath());

  LEVELDB_LOG("Persistent Cache Init Done, writer_cache_id: %lu\n", writer_cache_id_);

  return Status::OK();
}

Status PersistentCacheImpl::Read(const Slice& key, size_t offset, size_t length, Slice* content,
                                 SstDataScratch* scratch) {