[ndnSIM] Drop cached data in ndnsim

Zeinab Rezaiefar zeinab.rezaiefar at gmail.com
Thu Feb 13 00:17:32 PST 2020

Dear Spyridon,
I have noticed that data accessed from cs::Entry is constant so I cannot
change the freshness period of data and set it to zero. Therefore, I will
receive an error with following commands in the forward.cpp file:
for(ns3::Ptr<ns3::ndn::cs::Entry> csentry= m_csFromNdnSim->Begin();
csentry!= m_csFromNdnSim->End(); csentry=m_csFromNdnSim->Next(csentry))

error :
../src/ndnSIM/NFD/daemon/fw/forwarder.cpp:221:61: error: passing
‘std::__shared_ptr_access<const ndn::Data, (__gnu_cxx::_Lock_policy)2,
false, false>::element_type’ {aka ‘const ndn::Data’} as ‘this’ argument
discards qualifiers [-fpermissive]

However, maybe I understood something wrong from your solution.
I will be really grateful to know your opinion about this and your
another solution regarding this issue.
Bets regards

On Wed, Feb 12, 2020 at 5:48 PM Zeinab Rezaiefar <zeinab.rezaiefar at gmail.com>

> Dear Spyridon,
> Thank you so much for your answer and help. It is a good trick to not
> reply Interest with the cached data. However, as I understand data will not
> be deleted from the cache so
> in the case that I need to consider limited cache size, I may face a
> problem in evaluating the method. I prefer this data will be deleted from
> the cache so there will enough space for another data. If it does not mind,
> may I know your another solution as well.
> Thank you so much for time and help
> Best regards
> Zeinab
> On Tue, Feb 11, 2020 at 11:54 PM Spyridon Mastorakis <
> smastorakis at unomaha.edu> wrote:
>> One thing you can do without actually dropping any cached packets (and it
>> is a straightforward “hack”) is to set the freshness period of data packets
>> to 0 (or something very close to that) and set the MustBeFresh flag of
>> Interests to true (so that you simply ignore stale cached data packets):
>> https://named-data.net/wp-content/uploads/2018/08/hoticn18realtime-retrieval.pdf
>> If you really need to drop the packets, then I can give you another
>> solution.
>> Spyridon (Spyros) Mastorakis
>> Assistant Professor
>> Computer Science Department
>> University of Nebraska, Omaha
>> Peter Kiewit Institute Room 175A
>> https://sites.google.com/site/spyridonmastorakis
>> On Feb 11, 2020, at 1:49 AM, Zeinab Rezaiefar via ndnSIM <
>> ndnsim at lists.cs.ucla.edu> wrote:
>> Hello there,
>> In continue of my previous email regarding dropping cached data, I have
>> noticed that I need to erase data (using before evict signal)from cache and
>> also clean up the index from policy. Since I want to command the cache to
>> erase data from the forward.cpp file, I would like to know I can use Cs::
>> erase function to erase data from cache ?
>> May I know that I need still to cleanup index from policy as well.
>> I will be grateful to know our suggestions and guidance
>> Thanks
>> Best regards
>> Zeinab
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