RRCache.hxx

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#ifndef RESIP_RRCACHE_HXX
#define RESIP_RRCACHE_HXX
 
#include <map>
#include <set>
#include <memory>
 
#include "rutil/dns/RRFactory.hxx"
#include "rutil/dns/DnsResourceRecord.hxx"
#include "rutil/dns/DnsAAAARecord.hxx"
#include "rutil/dns/DnsHostRecord.hxx"
#include "rutil/dns/DnsNaptrRecord.hxx"
#include "rutil/dns/DnsSrvRecord.hxx"
#include "rutil/dns/DnsCnameRecord.hxx"
#include "rutil/dns/RRList.hxx"
 
namespace resip
{
class RROverlay;
 
class RRCache
{
   public:
      typedef RRList::Protocol Protocol;
      typedef RRList::LruList LruListType;
      typedef RRList::Records Result;
      typedef std::vector<RROverlay>::const_iterator Itr;
      typedef std::vector<Data> DataArr;
 
      RRCache();
      ~RRCache();
      void setTTL(int ttl) { if (ttl > 0) mUserDefinedTTL = ttl * MIN_TO_SEC; }
      void setSize(int size) { mSize = size; }
      // Update existing cache record, or add a new one
      void updateCache(const Data& target,
                       const int rrType,
                       Itr  begin, 
                       Itr  end);
      void updateCacheFromHostFile(const DnsHostRecord&);
      // Called to update the cache when there are DNS server errors (ie. record not found)
      void cacheTTL(const Data& target,
                    const int rrType,
                    const int status,
                    RROverlay overlay);
      bool lookup(const Data& target, const int type, const int proto, Result& records, int& status);
      void clearCache();
      void logCache();
      void getCacheDump(Data& dnsCacheDump);
 
   private:
      static const int MIN_TO_SEC = 60;
      static const int DEFAULT_USER_DEFINED_TTL = 10; // in seconds.
 
      static const int DEFAULT_SIZE = 512;
      class CompareT
      {
         public:
            bool operator()(const RRList* lhs, const RRList* rhs) const
            {
               if (lhs->rrType() < rhs->rrType())
               {
                  return true;
               }
               else if (lhs->rrType() > rhs->rrType())
               {
                  return false;
               }
               else
               {
                  return (Data(lhs->key())).lowercase() < (Data(rhs->key())).lowercase();
               }
            }
      };
 
      void touch(RRList* node);
      void cleanup();
      int getTTL(const RROverlay& overlay);
      void purge();
 
      RRList mHead;
      LruListType* mLruHead;                     
      Result Empty;
 
      typedef std::set<RRList*, CompareT> RRSet;
      RRSet mRRSet;
 
      RRFactory<DnsHostRecord> mHostRecordFactory;
      RRFactory<DnsSrvRecord> mSrvRecordFactory;
      RRFactory<DnsAAAARecord> mAAAARecordFactory;
      RRFactory<DnsNaptrRecord> mNaptrRecordFacotry;
      RRFactory<DnsCnameRecord> mCnameRecordFactory;
 
      typedef std::map<int, resip::RRFactoryBase*> FactoryMap;
      FactoryMap  mFactoryMap;
      
      int mUserDefinedTTL; // used when the ttl in RR is 0 or less than default(10). in seconds.
      unsigned int mSize;
};
 
}
 
#endif
 
 
/* ====================================================================
 * The Vovida Software License, Version 1.0 
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 * Copyright (c) 2010 SIP Spectrum, Inc.  All rights reserved.
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