[ndnSIM] Access outgoing data pipeline from strategy

[Rakesh Ranjan Jha]

Thanks Junxiao for the details!

On Wed, Jul 12, 2017 at 5:43 PM, Junxiao Shi <shijunxiao at email.arizona.edu>
wrote:

> Hi Rakesh
>
> However, I'm not sure how it is in violation of guideline.
>
>
> There isn’t a guideline. It’s just how strategy is designed. ndnSIM 1.0’s
> strategy can control almost everything. NFD’s strategy is designed to only
> have control over Interest forwarding.
>
> Let me try to cite a scenario:
> If the forwarding strategy finds queue on a particular outgoing data face
> is congested and it wants to defer the forwarding to a later time (say next
> data packet arrival for same face or a timer which ever occurs first).
>
>
> Strategy currently has no way to stop a Data from being forwarded onto a
> congested link.
> As explained in #3797-37
> <https://redmine.named-data.net/issues/3797#note-37>, a Data may satisfy
> multiple Interests, and those Interests may belong to multiple strategies.
> Therefore, not a single strategy has the authority to control how the Data
> is forwarded.
> However, if Interest digest  <https://redmine.named-data.net/issues/3333>is
> adopted, each Data satisfies only one Interest, and then strategy could
> have control over Data forwarding.
>
> Yours, Junxiao
>
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