Method Allocate

be/src/util/cache/rl-cache.cc:268–288

template<Cache::EvictionPolicy policy>
HandleBase* RLCacheShard<policy>::Allocate(Slice key, uint32_t hash, int val_len,
    size_t charge) {
  DCHECK(initialized_);
  int key_len = key.size();
  DCHECK_GE(key_len, 0);
  DCHECK_GE(val_len, 0);
  DCHECK_GT(charge, 0);
  if (charge == 0) return nullptr;
  int key_len_padded = KUDU_ALIGN_UP(key_len, sizeof(void*));
  uint8_t* buf = new uint8_t[sizeof(RLHandle)
                             + key_len_padded + val_len]; // the kv_data VLA data
  // TODO(KUDU-1091): account for the footprint of structures used by Cache's
  //                  internal housekeeping (RL handles, etc.) in case of
  //                  non-automatic charge.
  int calc_charge =
    (charge == Cache::kAutomaticCharge) ? kudu::kudu_malloc_usable_size(buf) : charge;
  uint8_t* kv_ptr = buf + sizeof(RLHandle);
  RLHandle* handle = new (buf) RLHandle(kv_ptr, key, hash, val_len,
      calc_charge);
  return handle;
}

template<Cache::EvictionPolicy policy>
void RLCacheShard<policy>::Free(HandleBase* handle) {