[Nfd-dev] Handling new content in app for pending interest in NFD

[Haowei Yuan]

I think as long as the data has actually been requested by an Interest
packet, it is safe to send the Data packet to NFD. The NFD will either
forward or drop the Data packet by checking if the Interest has
expired.

If the Interest has expired, Data packet is dropped, and the consumer
is still interested in the data, the consumer could resend the
Interest. Hopefully this time, the Data packet can be generated and
sent faster by the application so that NFD will forward it.

Haowei


On Mon, Mar 30, 2015 at 1:12 PM, Anil Jangam <anilj.mailing at gmail.com> wrote:
>
> On Mar 30, 2015 11:08 AM, "Dehart, John" <jdd at wustl.edu> wrote:
>>
>>
>> Is there any harm in it pushing the data out without knowing for sure if
>> the
>> Interest is still active?
>>
> If data is so critical, can the Interest be refreshed proactively before it
> expires?
>
> /anil
>
>> John
>>
>>> On Mar 30, 2015, at 1:05 PM, Burke, Jeff <jburke at remap.ucla.edu> wrote:
>>>
>>>
>>>
>>>>
>>>>
>>>> On Mon, Mar 30, 2015 at 10:28 AM Burke, Jeff <jburke at remap.ucla.edu>
>>>> wrote:
>>>>>
>>>>>
>>>>> Hi folks,
>>>>>
>>>>> We are facing this scenario in a few applications:
>>>>>
>>>>> 1) Interest received by NFD, passed to an application
>>>>> 2) Application not able to respond to interest, so interest stays in
>>>>> NFD PIT
>>>>> 3) Some time passes, but not enough for the Interest to expire
>>>>> 4) Application generates data (e.g., from a sensor reading) that would
>>>>> answer the Interest in the NFD PIT
>>>>>
>>>>> Question: How does app know to inform NFD it has the data after step 4,
>>>>> and how should it do that?
>>>>>
>>>>> - In this type of app, should it push the data unsolicited to the NFD
>>>>> and let it decide if there is something to do?
>>>>
>>>>
>>>> In my opinion, as long as the application is certain that the Interest
>>>> has arrived and is stored in NFD's PIT, it can just push the data out to
>>>> NFD.
>>>
>>>
>>>
>>> How certain does it have to be?  There is a chance it could have
>>> expired...
>>> jeff
>>>
>>>
>>>
>>>
>>>
>>>>
>>>> Wentao
>>>>
>>>>>
>>>>> - Is it recommended to implement an application-level PIT so the app is
>>>>> sure this data is solicited?  (Why add another PIT?)
>>>>>
>>>>> Thank you,
>>>>> Jeff
>>>>>
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>>
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