[ndnSIM] [EXT] Issue with writing custom nametree

[Junxiao Shi]

Hi Swetha

This means your changes are breaking the NameTree API needed by FIB.

1. Separately clone the NFD repository.
2. Checkout the NFD version used in your version of ndnSIM.
3. Apply your modifications there.
4. Ensure all unit tests are passing. If not, find out what's wrong in your
changes.
5. Now reapply the changes to ndnSIM, and the FIB will likely work.

Yours, Junxiao

On Mon, Oct 5, 2020 at 00:01 Swetha B via ndnSIM <ndnsim at lists.cs.ucla.edu>
wrote:

> *External Email*
> Hi all,
> I am implementing NDN tables indexing using closed hashing with linear
> probing in ndnSIM2.7.
> To achieve that I modified name-tree-hashtable.cpp and
> name-tree-iterator.cpp.
> After modifications i am able to successfully run producer consumer
> applications.
> In my custom scenario i am accessing FIB table of a node to insert a
> prefix and later execute consumer producer applications using that prefix.
>
> auto& fib1 = node1->GetObject<ndn::L3Protocol>()->getForwarder()->getFib();
>   auto e = fib1.insert(prefix).first;
>   ndn::FibHelper::AddRoute(node1,prefix,node4,1);
>
> When i execute this scenario i see that visualizer is'nt working and also
> the regular setup FIB tables on nodes is'nt taking place. I have shared a
> snapshot of execution.
>
> swetha at swetha-Ubuntu:~/Desktop/ndnSIM/ndnSIM-sample-topologies$
> NS_LOG="ndn-cxx.nfd.NameTreeHashtable:ndn.FibHelper:ndn.L3Protocol" ./waf
> --run=ndn-simple --vis
> Waf: Entering directory
> `/home/swetha/Desktop/ndnSIM/ndnSIM-sample-topologies/build'
> [23/34] cxx: scenarios/ndn-simple.cc -> build/scenarios/ndn-simple.cc.12.o
> [34/34] cxxprogram: build/scenarios/ndn-simple.cc.12.o -> build/ndn-simple
> Waf: Leaving directory
> `/home/swetha/Desktop/ndnSIM/ndnSIM-sample-topologies/build'
> 'build' finished successfully (6.937s)
> +0.000000000s 0 ndn.L3Protocol:L3Protocol(0x555bd319c4e0)
> +0.000000000s 0 ndn-cxx.nfd.NameTreeHashtable:computeThresholds(): [LOGIC]
> thresholds expand=512 shrink=102
> +0.000000000s 0 ndn-cxx.nfd.NameTreeHashtable:findOrInsert(): [LOGIC]
> insert / hash=0 bucket=0
> +0.000000000s 0 ndn-cxx.nfd.NameTreeHashtable:findOrInsert(): [LOGIC]
> insert /ndn hash=6181921638449679482 bucket=122
> +0.000000000s 0 ndn-cxx.nfd.NameTreeHashtable:findOrInsert(): [LOGIC]
> insert /ndn/multicast hash=18240561258910134669 bucket=397
> +0.000000000s 0 ndn-cxx.nfd.NameTreeHashtable:findOrInsert(): [LOGIC]
> insert /localhost hash=10937169108514740553 bucket=329
> +0.000000000s 0 ndn-cxx.nfd.NameTreeHashtable:findOrInsert(): [LOGIC]
> insert /localhost/nfd hash=3626199823732152002 bucket=706
>
> swetha at swetha-Ubuntu:~/Desktop/ndnSIM/ndnSIM-sample-topologies$
>
>
>
>   I m grateful for any thoughts and advice regarding where i am going
> wrong in this.
> Thanks.
>
> Swetha B.
> Research Scholar
> RNSIT
> Bengaluru
> India
>
>
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