[ndnSIM] Get node id in forwarding strategy

[Klaus Schneider]

Hey,

Sorry for the late reply, I just wanted to add another way of getting 
the node id into the forwarding strategy:

You can just create a node pointer in the Forwarder class and pass it 
via the constructor (the constructor is only called once in 
ns3::ndn::L3Protocol::initialize() )

>   Forwarder(ns3::Ptr<ns3::Node> node);

 From there, it's easy to access from the strategy.

Best regards,
Klaus



On 14/06/18 05:44, Adhy Satya wrote:
> Hi Alex. Hi John,
> 
> Thanks for the answers.
> 
> @Alex, I'm not sure if I understood your solution correctly. The line 
> "/ns3::Ptr<ns3::Node> node = 
> ns3::NodeList::GetNode(ns3::Simulator::GetContext());/" is causing the 
> crash because in some cases the call to Simulator::GetContext() was 
> returning an invalid number. What should I use instead?
> 
> @John, this solution seems to work for me :) Thanks.
> 
> 
> Best,
> Adhy
> 
> 
> On Thu, Jun 14, 2018 at 6:30 AM, John Baugh <jpbaugh at umich.edu 
> <mailto:jpbaugh at umich.edu>> wrote:
> 
>     I think using the Simulator::ScheduleWithContext would be the best,
>     as Alex just suggested.
> 
>     However, what is the behavior if you tried something like:
> 
>     void
>     BroadcastStrategy::afterReceiveInterest(const Face& inFace, const
>     Interest& interest,const shared_ptr<pit::Entry>& pitEntry)
>     {
>        const fib::Entry& fibEntry = this->lookupFib(*pitEntry);
>        const fib::NextHopList& nexthops = fibEntry.getNextHops();
>     *int contextVal = ns3::Simulator::GetContext();*
>     *
>     *
>     * if(contextVal != -1) *
>     * {*
>     *    ns3::Ptr<ns3::Node> node = ns3::NodeList::GetNode(contextVal); *
>          ns3::Ptr<ns3::NetDevice> netDevice;
>          ns3::Ptr<ns3::ndn::L3Protocol> ndnl3;
>          ndnl3 = node->GetObject<ns3::ndn::L3Protocol>();
>       }
> 
> 
>     //...........
> 
>     Thoughts?
> 
>     John
> 
>     On Wed, Jun 13, 2018 at 8:33 PM, Adhy Satya <adhysatya820 at gmail.com
>     <mailto:adhysatya820 at gmail.com>> wrote:
> 
>         Hi,
> 
>         I wrote a custom fw-strategy where I get the node ID like so:
> 
>         void
>         BroadcastStrategy::afterReceiveInterest(const Face& inFace,
>         const Interest& interest,const shared_ptr<pit::Entry>& pitEntry)
>         {
>            const fib::Entry& fibEntry = this->lookupFib(*pitEntry);
>            const fib::NextHopList& nexthops = fibEntry.getNextHops();
>            ns3::Ptr<ns3::Node> node =
>         ns3::NodeList::GetNode(ns3::Simulator::GetContext());
>            ns3::Ptr<ns3::NetDevice> netDevice;
>            ns3::Ptr<ns3::ndn::L3Protocol> ndnl3;
>            ndnl3 = node->GetObject<ns3::ndn::L3Protocol>();
> 
> 
>         The issue is that I'm getting the exact same error as this post
>         from Oct 2017
>         <http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-October/004175.html>.
>         There are several other posts with the same issue, some want to
>         get the node id in the lru-cache, etc. However, all these posts
>         seem to be scheduling an event, then getting with
>         Simulator::GetContext().
> 
>         I can't apply the solution from this posts in my case, since I
>         don't call Simulator::ScheduleWithContext(). I just want to get
>         the id of the node that is processing the Interest.
> 
>         Is there another option to this?
> 
>         I'm using ndnSIM 2.5
> 
>         Thank you!
>         Adhy
> 
> 
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> 
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