[ndnSIM] Print Queue length

[Ilya Moiseenko]

The parent class Queue has a method “GetNPackets”
http://www.nsnam.org/docs/release/3.18/doxygen/classns3_1_1_queue.html#a50dcb693d5325708d8c90770f795eabc

Ilya

On Dec 5, 2013, at 3:10 PM, Amin Karami <amin at ac.upc.edu> wrote:

> Hi llya!
> I want to print the number of filled elements in queue in an interface in a specific time, not original (predefined) size of the queue. I think, i posted wrong title for my question :-)
> I could not find related attribute in your suggested link. I found these attributes: Mode, MaxPackets, MaxBytes
> 
> Is there any suggestion?
> 
> 
> Thank you in advance.
> 
> /Amin
> 
> On 12/05/2013 07:59 ب.ظ, Ilya Moiseenko wrote:
>> Hi Amin
>> 
>> 1) m_maxPackets is indeed private.
>> However, you can access this value by attribute named “MaxPackets"
>> See http://www.nsnam.org/docs/release/3.18/doxygen/classns3_1_1_drop_tail_queue.html for details
>> 
>> 2) Technically you can do this in NS3. And in real life routers can have different queue sizes. 
>> 
>> 
>> Ilya
>> 
>> On Dec 4, 2013, at 2:35 AM, Amin Karami <amin at ac.upc.edu> wrote:
>> 
>>> Hi Alex,
>>> I am going to print Queue length in a specific interface of a router. I wrote below function:
>>> 
>>> void PeriodicStatsPrinter (Ptr<Node> node, Time next)
>>> Ptr<ndn::Pit> pit = node->GetObject<ndn::Pit> ();
>>> Ptr<Channel> CH = node->GetDevice(2)->GetChannel(); \\ 2nd interface of the node
>>> Ptr<NetDevice> toDev = CH->GetDevice (1); \\ access to its queue
>>> PointerValue txQueue;
>>> toDev->GetAttribute ("TxQueue", txQueue);
>>> std::cout << Simulator::Now ().ToDouble (Time::S) << "\t"
>>> << Names::FindName (node) << "\t"
>>> << "Max Packets of Queue: " << txQueue.Get<DropTailQueue> ()->m_maxPackets << "\n";
>>> 
>>> 1- But, i faced with this error:
>>> ../scratch/RTT/RTT.cc: In function ‘void PeriodicStatsPrinter(ns3::Ptr<ns3::Node>, ns3::Time)’:
>>> ../scratch/RTT/RTT.cc:44:6: error: expected primary-expression before ‘<<’ token
>>> ./ns3/drop-tail-queue.h:68:12: error: ‘uint32_t ns3::DropTailQueue::m_maxPackets’ is private
>>> ../scratch/RTT/RTT.cc:44:58: error: within this context
>>> 
>>> 2- Could i define two Queue lengths for a specific interface in routers? from inside and outside of a link. Or both should be equal?
>>> 
>>> 
>>> /Amin
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>>> ndnSIM at lists.cs.ucla.edu
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