[ndnSIM] when is a node‘s aggregated object being initialized？

[yao930 at mail.ustc.edu.cn]

I notice that in ndnSIM2.7, source code ndn-stack-helper.cpp, the implementation of Install() is different from that of ndnSIM2.6.

In ndnSIM2.7, a DoInstall() is called by Simulator::SchedulerWithContext(),  which does the same thing as Install() function in ndnSIM2.6. And ProcessWarmupEvents() runs Simulator::Run(). What's the difference between here and the example file's Simulator::Run()?

Since Simulator::Run() in function ProcessWarmupEvents() invokes Node::DoInitialize(), I wonder if that might be the reason traffic-control-layer cannot be initialized correctly, because it's aggregated to a node after the node's DoInitialize() is called.

At2019-04-21 10:42:33，yao930 at mail.ustc.edu.cnwrote:

Hello all,


I am doing experiment with ndnSIM2.7, and I want to use traffic control model in ns-3 to help realize queue scheduling. 


I tried to aggregate a traffic-control-layer model on a node by modifying ndn-stack-helper.cc DoInstall() like this:


  ObjectFactory factory;

  factory.SetTypeId ("ns3::TrafficControlLayer");

  Ptr<Object> protocol = factory.Create <Object> ();

  node->AggregateObject (protocol);

which is similar to add a L3Protocol like this: node->AggregateObject(ndn)


But the traffic-control cannot start correctly, and later a SIGSEV error appeared.


From logs I can't see traffic-control-layer's DoInitialize() being called, so I think that might be the reason of the error.


After reading some documents and source code, now I understand the relationship between the function Initialize() and DoInitialize(), and Object and it's subclasses. Since ndnSIM simply starts the simulation like: Simulator::Run(), I am confused about when is all those Initialize work being done before starting simulation?


Any hints would be really appreciated!


Thanks advance~


Sincerely，
Chris Chen
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