PtrTracer(const ManagedHeap& heap)
{
// сформировать список объектов
objects.reserve(heap.allocations.size());
for(Allocations::const_iterator i = heap.allocations.begin(); i != heap.allocations.end(); ++i)
objects.push_back(Object(i->first, i->second.size, i->second.info));
std::sort(objects.begin(), objects.end(), sorter);
// сформировать карту ссылок
for(Ptrs::const_iterator i = heap.ptrs.begin(); i != heap.ptrs.end(); ++i)
{
// найти объект, в котором содержится указатель
Objects::const_iterator j = std::upper_bound(objects.begin(), objects.end(), i->first, sorter);
if(j > objects.begin())
{
--j;
if((size_t)((char*)i->first - (char*)j->data) < j->size)
// да, указатель содержится в этом объекте
// получить объект, на который указывает указатель, и добавить ссылку
links.insert(std::make_pair(j, std::lower_bound(objects.begin(), objects.end(), i->second, sorter)));
}
}
}
NetPath VirtualLinkRouter::routeKShortestPathsALL(VirtualLink * virtualLink, Network * network, std::vector<NetPath> * pathStorage)
{
// links and switches that would be removed from the network,
// they should be restored after algorithm's finish
Links removedLinks;
Switches removedSwitches;
// first, create the graph with decreased capacities
decreaseCapacities(virtualLink, network, &removedLinks, &removedSwitches);
// Yen's algorithm
NetPath shortest = searchPathDejkstra(virtualLink, network, K_SHORTEST_PATHS);
if ( shortest.size() == 0 )
{
restoreCapacities(virtualLink, network, &removedLinks, &removedSwitches);
return NetPath(); // no path found!
}
pathStorage->push_back(shortest);
Links& links = network->getLinks();
unsigned pathsFound = 1;
long pathWeight = calculateKShortestPathWeight(shortest);
bool isNewPathFound = true;
while ( isNewPathFound && pathsFound < Criteria::kShortestPathDepth() )
{
NetPath candidate = shortest;
NetPath::iterator it = shortest.begin();
NetPath::iterator itEnd = shortest.end();
isNewPathFound = false;
bool isNewCandidateFound = false;
Link * linkToRemove = NULL;
for ( ; it != itEnd; ++it )
{
if ( (*it)->isLink() && links.find(static_cast<Link*>(*it)) != links.end() )
{
// removing link and trying dejkstra
links.erase(links.find(static_cast<Link*>(*it)));
NetPath newPath = searchPathDejkstra(virtualLink, network, K_SHORTEST_PATHS);
if ( newPath.size() == shortest.size() )
{
isNewPathFound = true;
pathStorage->push_back(newPath);
++pathsFound;
long weight = calculateKShortestPathWeight(newPath);
if ( weight > pathWeight )
{
isNewCandidateFound = true;
linkToRemove = static_cast<Link*>(*it);
pathWeight = weight;
candidate = newPath;
if ( pathsFound == Criteria::kShortestPathDepth() )
break;
}
if ( linkToRemove == NULL )
linkToRemove = static_cast<Link*>(*it); // to avoid the situation with removing NULL-link
}
links.insert(static_cast<Link*>(*it)); // inserting link again
}
}
if ( isNewCandidateFound )
shortest = candidate;
if ( isNewPathFound && pathsFound != Criteria::kShortestPathDepth() )
{
// restoring the capacity of link being removed
linkToRemove->RemoveAssignment(virtualLink);
links.erase(links.find(linkToRemove));
removedLinks.insert(linkToRemove);
}
}
// restoring removed capacities
restoreCapacities(virtualLink, network, &removedLinks, &removedSwitches);
return shortest;
}