[ndnSIM] Using the setExpiryTImer

Ashish Pradhan ashishpradhan1162 at gmail.com
Sat Nov 24 16:08:09 PST 2018

Hi Xinyu,

Thank you for your reply.

I am fully aware of the One-Interest-One-Data behavior. However, I have
a custom app(a producer) where it produces multiple data for a single
interest. Then I want all the produced data to reach the consumer. So for
that, I am implementing a custom strategy where the PIT entry lifetime of
the nodes are extended after it receives the first data from the producer.
I have followed the ndnSIM API documentation for it.

beforeSatisfyInterest documentation:

setExpiryTimer documentation:

Best regards,
Ashish Pradhan

On Sun, Nov 25, 2018 at 2:21 AM Xinyu Ma <bitmxy at gmail.com> wrote:

> Hello, Pradhan
> I’m sorry I don’t understand why you want to extend the PIT entry’s
> lifetime and what you mean by “data response other than the first one”.
> NDN follows One-Interest-One-Data, so the PIT entry should be deleted
> after receiving the data.
> You can send another Interest if you still want the PIT entry to be there.
> Best,
> Xinyu Ma.
> On Nov 24, 2018, at 6:20 AM, Ashish Pradhan <ashishpradhan1162 at gmail.com>
> wrote:
> Hi all,
> I am trying to use the setExpiryTimer to extend the PIT entry's lifetime.
> However the data response other than the first one is not being forwarded
> back to the consumer. I have included the setExpiryTimer in the
> beforeSatisfyInterest function as follows:
> "NFD_LOG_DEBUG("beforeSatisfyInterest pitEntry=" << pitEntry->getName() <<
>                 " inFace=" << inFace.getId() << " data=" <<
> data.getName());
>   this->Strategy::setExpiryTimer(pitEntry, ndn::time::milliseconds(100));"
> Is there any thing that needs to be added?
> After looking at the sendData function there is this line
> "pitEntry->deleteInRecord(outFace);". If it is deleting the inRecord how
> does the setExpiryTimer help to preserve the entry?
> Best regards,
> Ashish Pradhan
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> ndnSIM at lists.cs.ucla.edu
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