C++ (Cpp) shared_ptr::getChildSelector示例

示例#1

void
MemoryContentCache::operator()
  (const ptr_lib::shared_ptr<const Name>& prefix,
   const ptr_lib::shared_ptr<const Interest>& interest, Face& face,
   boost::uint64_t interestFilterId,
   const ptr_lib::shared_ptr<const InterestFilter>& filter)
{
  doCleanup();

  const Name::Component* selectedComponent = 0;
  Blob selectedEncoding;
  // We need to iterate over both arrays.
  size_t totalSize = staleTimeCache_.size() + noStaleTimeCache_.size();
  for (size_t i = 0; i < totalSize; ++i) {
    const Content* content;
    if (i < staleTimeCache_.size())
      content = staleTimeCache_[i].get();
    else
      // We have iterated over the first array. Get from the second.
      content = noStaleTimeCache_[i - staleTimeCache_.size()].get();

    if (interest->matchesName(content->getName())) {
      if (interest->getChildSelector() < 0) {
        // No child selector, so send the first match that we have found.
        face.send(*content->getDataEncoding());
        return;
      }
      else {
        // Update selectedEncoding based on the child selector.
        const Name::Component* component;
        if (content->getName().size() > interest->getName().size())
          component = &content->getName().get(interest->getName().size());
        else
          component = &emptyComponent_;

        bool gotBetterMatch = false;
        if (!selectedEncoding)
          // Save the first match.
          gotBetterMatch = true;
        else {
          if (interest->getChildSelector() == 0) {
            // Leftmost child.
            if (*component < *selectedComponent)
              gotBetterMatch = true;
          }
          else {
            // Rightmost child.
            if (*component > *selectedComponent)
              gotBetterMatch = true;
          }
        }

        if (gotBetterMatch) {
          selectedComponent = component;
          selectedEncoding = content->getDataEncoding();
        }
      }
    }
  }

  if (selectedEncoding)
    // We found the leftmost or rightmost child.
    face.send(*selectedEncoding);
  else {
    // Call the onDataNotFound callback (if defined).
    map<string, OnInterestCallback>::iterator onDataNotFound =
      onDataNotFoundForPrefix_.find(prefix->toUri());
    if (onDataNotFound != onDataNotFoundForPrefix_.end() &&
        onDataNotFound->second)
      onDataNotFound->second(prefix, interest, face, interestFilterId, filter);
  }
}