TransactionMap.hxx

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#if !defined(RESIP_TRANSACTIONMAP_HXX)
#define RESIP_TRANSACTIONMAP_HXX
 
#include <unordered_map>
#include "rutil/Data.hxx"
 
namespace resip
{
  class TransactionState;
 
class TransactionMap 
{
  public:
     ~TransactionMap();
     
     TransactionState* find( const Data& transactionId ) const;
     void add( const Data& transactionId, TransactionState* state  );
     void erase( const Data& transactionId );
     int size() const;
     
  private:
 
     // We treat branch parameters as case insensitive (RFC3261):
     // 7.3.1 Header Field Format
     // ....
     //    When comparing header fields, field names are always case-
     //    insensitive.Unless otherwise stated in the definition of a
     //    particular header field, field values, parameter names, and parameter
     //    values are case-insensitive.Tokens are always case-insensitive.
     //    Unless specified otherwise, values expressed as quoted strings are
     //    case-sensitive.
 
      class BranchHasher
      {
         public:
            inline size_t operator()(const Data& branch) const
            {
               // Branches are chosen by remote peers.  With a fixed hash a sender
               // could pick branches that all collide, making every transaction
               // lookup on the stack thread scan all of them; the keyed hash
               // prevents that (see KeyedDataHash).
               return branch.keyedCaseInsensitiveHash();
            }
      };
 
      class BranchEqual
      {
         public:
            inline bool operator()(const Data& branch1, const Data& branch2) const
            {
               return isEqualNoCase(branch1,branch2);
            }
      };
 
     std::unordered_map<Data, TransactionState*, BranchHasher, BranchEqual> mMap;
};
}
 
#endif
 
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