A Candidate Queue used in routing calculations. More...
#include "candidatequeue.h"
Public Member Functions  
CandidateQueue ()  
Create an empty SPF Candidate Queue. More...  
virtual  ~CandidateQueue () 
Destroy an SPF Candidate Queue and release any resources held by the contents. More...  
void  Clear (void) 
Empty the Candidate Queue and release all of the resources associated with the Shortest Path First Vertex pointers in the queue. More...  
bool  Empty (void) const 
Test the Candidate Queue to determine if it is empty. More...  
SPFVertex *  Find (const Ipv4Address addr) const 
Searches the Candidate Queue for a Shortest Path First Vertex pointer that points to a vertex having the given IP address. More...  
SPFVertex *  Pop (void) 
Pop the Shortest Path First Vertex pointer at the top of the queue. More...  
void  Push (SPFVertex *vNew) 
Push a Shortest Path First Vertex pointer onto the queue according to the priority scheme. More...  
void  Reorder (void) 
Reorders the Candidate Queue according to the priority scheme. More...  
uint32_t  Size (void) const 
Return the number of Shortest Path First Vertex pointers presently stored in the Candidate Queue. More...  
SPFVertex *  Top (void) const 
Return the Shortest Path First Vertex pointer at the top of the queue. More...  
Private Types  
typedef std::list< SPFVertex * >  CandidateList_t 
container of SPFVertex pointers More...  
Private Member Functions  
CandidateQueue (CandidateQueue &sr)  
Candidate Queue copy construction is disallowed (not implemented) to prevent the compiler from slipping in incorrect versions that don't properly deal with deep copies. More...  
CandidateQueue &  operator= (CandidateQueue &sr) 
Candidate Queue assignment operator is disallowed (not implemented) to prevent the compiler from slipping in incorrect versions that don't properly deal with deep copies. More...  
Static Private Member Functions  
static bool  CompareSPFVertex (const SPFVertex *v1, const SPFVertex *v2) 
return true if v1 < v2 More...  
Private Attributes  
CandidateList_t  m_candidates 
SPFVertex candidates. More...  
Friends  
std::ostream &  operator<< (std::ostream &os, const CandidateQueue &q) 
Stream insertion operator. More...  
A Candidate Queue used in routing calculations.
The CandidateQueue is used in the OSPF shortest path computations. It is a priority queue used to store candidates for the shortest path to a given network.
The queue holds Shortest Path First Vertex pointers and orders them according to the lowest value of the field m_distanceFromRoot. Remaining vertices are ordered according to increasing distance. This implements a priority queue.
Although a STL priority_queue almost does what we want, the requirement for a Find () operation, the dynamic nature of the data and the derived requirement for a Reorder () operation led us to implement this simple enhanced priority queue.
Definition at line 51 of file candidatequeue.h.

private 
container of SPFVertex pointers
Definition at line 187 of file candidatequeue.h.
ns3::CandidateQueue::CandidateQueue  (  ) 
Create an empty SPF Candidate Queue.
Definition at line 68 of file candidatequeue.cc.
References NS_LOG_FUNCTION.

virtual 
Destroy an SPF Candidate Queue and release any resources held by the contents.
Definition at line 74 of file candidatequeue.cc.
References Clear(), and NS_LOG_FUNCTION.

private 
Candidate Queue copy construction is disallowed (not implemented) to prevent the compiler from slipping in incorrect versions that don't properly deal with deep copies.
sr  object to copy 
void ns3::CandidateQueue::Clear  (  void  ) 
Empty the Candidate Queue and release all of the resources associated with the Shortest Path First Vertex pointers in the queue.
Definition at line 81 of file candidatequeue.cc.
References m_candidates, NS_LOG_FUNCTION, and Pop().
Referenced by ~CandidateQueue().

staticprivate 
return true if v1 < v2
SPFVertexes are added into the queue according to the ordering defined by this method. If v1 should be popped before v2, this method return true; false otherwise
v1  first operand 
v2  second operand 
Definition at line 180 of file candidatequeue.cc.
References ns3::SPFVertex::GetDistanceFromRoot(), ns3::SPFVertex::GetVertexType(), NS_LOG_FUNCTION, ns3::SPFVertex::VertexNetwork, and ns3::SPFVertex::VertexRouter.
Referenced by Push(), and Reorder().
bool ns3::CandidateQueue::Empty  (  void  )  const 
Test the Candidate Queue to determine if it is empty.
Definition at line 131 of file candidatequeue.cc.
References m_candidates, and NS_LOG_FUNCTION.
SPFVertex * ns3::CandidateQueue::Find  (  const Ipv4Address  addr  )  const 
Searches the Candidate Queue for a Shortest Path First Vertex pointer that points to a vertex having the given IP address.
addr  The IP address to search for. 
Definition at line 145 of file candidatequeue.cc.
References ns3::SPFVertex::GetVertexId(), m_candidates, and NS_LOG_FUNCTION.
Referenced by ns3::GlobalRouteManagerImpl::SPFNext().

private 
Candidate Queue assignment operator is disallowed (not implemented) to prevent the compiler from slipping in incorrect versions that don't properly deal with deep copies.
sr  object to assign 
SPFVertex * ns3::CandidateQueue::Pop  (  void  ) 
Pop the Shortest Path First Vertex pointer at the top of the queue.
The caller is given the responsibility for releasing the resources associated with the vertex.
Definition at line 105 of file candidatequeue.cc.
References m_candidates, and NS_LOG_FUNCTION.
Referenced by Clear(), GlobalRouteManagerImplTestCase::DoRun(), and ns3::GlobalRouteManagerImpl::SPFCalculate().
void ns3::CandidateQueue::Push  (  SPFVertex *  vNew  ) 
Push a Shortest Path First Vertex pointer onto the queue according to the priority scheme.
On completion, the top of the queue will hold the Shortest Path First Vertex pointer that points to a vertex having lowest value of the field m_distanceFromRoot. Remaining vertices are ordered according to increasing distance.
vNew  The Shortest Path First Vertex to add to the queue. 
Definition at line 93 of file candidatequeue.cc.
References CompareSPFVertex(), m_candidates, and NS_LOG_FUNCTION.
Referenced by GlobalRouteManagerImplTestCase::DoRun(), and ns3::GlobalRouteManagerImpl::SPFNext().
void ns3::CandidateQueue::Reorder  (  void  ) 
Reorders the Candidate Queue according to the priority scheme.
On completion, the top of the queue will hold the Shortest Path First Vertex pointer that points to a vertex having lowest value of the field m_distanceFromRoot. Remaining vertices are ordered according to increasing distance.
This method is provided in case the values of m_distanceFromRoot change during the routing calculations.
Definition at line 163 of file candidatequeue.cc.
References CompareSPFVertex(), m_candidates, NS_LOG_FUNCTION, and NS_LOG_LOGIC.
Referenced by ns3::GlobalRouteManagerImpl::SPFNext().
uint32_t ns3::CandidateQueue::Size  (  void  )  const 
Return the number of Shortest Path First Vertex pointers presently stored in the Candidate Queue.
Definition at line 138 of file candidatequeue.cc.
References m_candidates, and NS_LOG_FUNCTION.
Referenced by ns3::GlobalRouteManagerImpl::SPFCalculate().
SPFVertex * ns3::CandidateQueue::Top  (  void  )  const 
Return the Shortest Path First Vertex pointer at the top of the queue.
This method does not pop the SPFVertex* off of the queue, it simply returns the pointer.
Definition at line 119 of file candidatequeue.cc.
References m_candidates, and NS_LOG_FUNCTION.

friend 
Stream insertion operator.
os  the reference to the output stream 
q  the CandidateQueue 
Definition at line 49 of file candidatequeue.cc.

private 