/home/runner/work/resiprocate/resiprocate/rutil/TimeLimitFifo.hxx

A templated, threadsafe message-queue class that enforces constraints on time-depth.

A templated, threadsafe message-queue class that enforces constraints on time-depth.

TimeLimitFifo<Foo> tlf(5, 10); // 5 seconds or 10 count limit
//
// where Foo is defined as:
// class Foo
// {
//    public:
//       Foo(const Data& val) : mVal(val) {}
//       Data mVal;
// };
//
 
resip_assert(tlf.empty());
resip_assert(tlf.size() == 0);
resip_assert(tlf.timeDepth() == 0);
 
c = tlf.add(new Foo("first"), TimeLimitFifo<Foo>::EnforceTimeDepth);
resip_assert(c);
 
// no longer empty
resip_assert(!tlf.empty());
resip_assert(tlf.size() == 1);
resip_assert(tlf.timeDepth() == 0);
 
sleepMs(2000);
 
// still not empty
resip_assert(!tlf.empty());
resip_assert(tlf.size() == 1);
resip_assert(tlf.timeDepth() > 1);
 
if (tlf.messageAvailable())
  delete tlf.getNext();
 
// Foo* fp = tlf.getNext();
// resip_assert (fp->mVal == "first")
// delete fp ;
 
// now its empty
resip_assert(tlf.empty());
resip_assert(tlf.size() == 0);
resip_assert(tlf.timeDepth() == 0);

#ifndef RESIP_TimeLimitFifo_hxx
#define RESIP_TimeLimitFifo_hxx 
 
#include "rutil/ResipAssert.h"
#include <memory>
#include "rutil/AbstractFifo.hxx"
#include <iostream>
#if defined( WIN32 )
#include <time.h>
#endif
 
// efficiency note: use a circular buffer to avoid list node allocation
 
// what happens to timers that can't be queued?
 
namespace resip
{
 
template<typename Payload>
class Timestamped
{
   public:
      Timestamped(const Payload& msg, time_t n)
         : mMsg(msg),
           mTime(n)
      {}
 
      inline const Payload& getMsg() const { return mMsg;} 
      inline void setMsg(const Payload& pMsg) { mMsg = pMsg;}
      inline const time_t& getTime() const { return mTime;} 
 
   private:
      Payload mMsg;
      time_t mTime;
};
 
template <class Msg>
class TimeLimitFifo : public AbstractFifo< Timestamped<Msg*> >
{
   public:
      typedef enum {EnforceTimeDepth, IgnoreTimeDepth, InternalElement} DepthUsage;
 
      TimeLimitFifo(unsigned int maxDurationSecs,
                    unsigned int maxSize);
 
      virtual ~TimeLimitFifo();
 
      using AbstractFifo< Timestamped<Msg*> >::mFifo;
      using AbstractFifo< Timestamped<Msg*> >::mMutex;
      using AbstractFifo< Timestamped<Msg*> >::mCondition;
      using AbstractFifo< Timestamped<Msg*> >::empty;
      using AbstractFifo< Timestamped<Msg*> >::size;
      using AbstractFifo< Timestamped<Msg*> >::onMessagePushed;
 
      bool add(Msg* msg, DepthUsage usage);
 
      Msg* getNext();
      Msg* getNext(int ms);
      
      virtual time_t timeDepth() const;
 
      
      bool wouldAccept(DepthUsage usage) const;
 
      void clear();
 
      virtual size_t getCountDepth() const;
      virtual time_t getTimeDepth() const;
      virtual size_t getCountDepthTolerance() const;
      virtual time_t getTimeDepthTolerance() const;
      virtual void setCountDepthTolerance(unsigned int max);
      virtual void setTimeDepthTolerance(unsigned int maxSecs);
 
   private:
      time_t timeDepthInternal() const;
      inline bool wouldAcceptInteral(DepthUsage usage) const;
      TimeLimitFifo(const TimeLimitFifo& rhs);
      TimeLimitFifo& operator=(const TimeLimitFifo& rhs);
 
      time_t mMaxDurationSecs;
      unsigned int mMaxSize;
      unsigned int mUnreservedMaxSize;
};
 
template <class Msg>
TimeLimitFifo<Msg>::TimeLimitFifo(unsigned int maxDurationSecs,
                                  unsigned int maxSize)
   : AbstractFifo< Timestamped<Msg*> >(),
     mMaxDurationSecs(maxDurationSecs),
     mMaxSize(maxSize),
     mUnreservedMaxSize((int)((maxSize*8)/10)) // !dlb! random guess
{}
 
template <class Msg>
TimeLimitFifo<Msg>::~TimeLimitFifo()
{
   clear();
   resip_assert(empty());
}
 
template <class Msg>
bool
TimeLimitFifo<Msg>::add(Msg* msg,
                        DepthUsage usage)
{
   Lock lock(mMutex); (void)lock;
 
   if (wouldAcceptInteral(usage))
   {
      time_t n = time(0);
      mFifo.push_back(Timestamped<Msg*>(msg, n));
      onMessagePushed(1);
      mCondition.notify_one();
      return true;
   }
   else
   {
      return false;
   }
}
 
template <class Msg>
bool
TimeLimitFifo<Msg>::wouldAccept(DepthUsage usage) const
{
   Lock lock(mMutex); (void)lock;
 
   return wouldAcceptInteral(usage);
}
 
template <class Msg>
Msg*
TimeLimitFifo<Msg>::getNext()
{
   Timestamped<Msg*> tm(AbstractFifo< Timestamped<Msg*> >::getNext());
   return tm.getMsg();
}
 
template <class Msg>
Msg*
TimeLimitFifo<Msg>::getNext(int ms)
{
   Timestamped<Msg*> tm(0,0);
   if(AbstractFifo< Timestamped<Msg*> >::getNext(ms, tm))
   {
      return tm.getMsg();
   }
   return 0;
}
 
template <class Msg>
time_t
TimeLimitFifo<Msg>::timeDepthInternal() const
{
   if(mFifo.empty())
   {
      return 0;
   }
 
   return time(0) - mFifo.front().getTime();
}
 
template <class Msg>
bool
TimeLimitFifo<Msg>::wouldAcceptInteral(DepthUsage usage) const
{
   if ((mMaxSize != 0 &&
        mFifo.size() >= mMaxSize))
   {
      return false;
   }
 
   if (usage == InternalElement)
   {
      return true;
   }
 
   if (mUnreservedMaxSize != 0 &&
       mFifo.size() >= mUnreservedMaxSize)
   {
      return false;
   }
 
   if (usage == IgnoreTimeDepth)
   {
      return true;
   }
 
   resip_assert(usage == EnforceTimeDepth);
 
   if (mFifo.size() == 0 ||
       mMaxDurationSecs == 0 ||
       timeDepthInternal() < mMaxDurationSecs)
   {
      return true;
   }
 
   return false;
}
 
template <class Msg>
time_t
TimeLimitFifo<Msg>::timeDepth() const
{
   Lock lock(mMutex); (void)lock;
   return timeDepthInternal();
}
 
template <class Msg>
void
TimeLimitFifo<Msg>::clear()
{
   Lock lock(mMutex); (void)lock;
 
   while (!mFifo.empty())
   {
      delete mFifo.front().getMsg();
      mFifo.pop_front();
   }
}
 
template <class Msg>
size_t
TimeLimitFifo<Msg>::getCountDepth() const
{
   return size();
}
 
template <class Msg>
size_t
TimeLimitFifo<Msg>::getCountDepthTolerance() const
{
   return mUnreservedMaxSize;
}
 
template <class Msg>
time_t 
TimeLimitFifo<Msg>::getTimeDepth() const
{
   return timeDepth();
}
 
template <class Msg>
time_t
TimeLimitFifo<Msg>::getTimeDepthTolerance() const
{
   return mMaxDurationSecs;
}
 
template <class Msg>
void
TimeLimitFifo<Msg>::setCountDepthTolerance(unsigned int maxCount)
{
   Lock lock(mMutex); (void)lock;
   mUnreservedMaxSize=int(maxCount * 0.8);
}
 
template <class Msg>
void
TimeLimitFifo<Msg>::setTimeDepthTolerance(unsigned int maxSecs)
{
   Lock lock(mMutex); (void)lock;
 
   mMaxDurationSecs=maxSecs;
}
 
 
} // namespace resip
 
#endif
 
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