bool MMTinyLFU::Container::recordAccess()

in cachelib/allocator/MMTinyLFU-inl.h [65:101]

• 34 lines of code
• 12 McCabe index (conditional complexity)

bool MMTinyLFU::Container<T, HookPtr>::recordAccess(T& node,
                                                    AccessMode mode) noexcept {
  if ((mode == AccessMode::kWrite && !config_.updateOnWrite) ||
      (mode == AccessMode::kRead && !config_.updateOnRead)) {
    return false;
  }

  const auto curr = static_cast<Time>(util::getCurrentTimeSec());
  // check if the node is still being memory managed
  if (node.isInMMContainer() &&
      ((curr >= getUpdateTime(node) +
                    lruRefreshTime_.load(std::memory_order_relaxed)) ||
       !isAccessed(node))) {
    if (!isAccessed(node)) {
      markAccessed(node);
    }
    LockHolder l(lruMutex_, std::defer_lock);
    if (config_.tryLockUpdate) {
      l.try_lock();
    } else {
      l.lock();
    }
    if (!l.owns_lock()) {
      return false;
    }
    reconfigureLocked(curr);
    if (!node.isInMMContainer()) {
      return false;
    }

    lru_.getList(getLruType(node)).moveToHead(node);
    setUpdateTime(node, curr);
    updateFrequenciesLocked(node);
    return true;
  }
  return false;
}