[http_server] Simplify DRT node and table #132
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...other than shared_ptr everywhere on each small drt_node objects.
...because the function forwardings to the impl are redundant.
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When I see the
std::vecotr<std::shared_ptr<drt_node>>andstd::vector<std::shared_ptr<std::string>>as thedrt_nodeanddynamic_routing_table's members respectively, I cannot help wondering why theshared_ptr<T>are needed here. Later I realized the instance of the DRT table is allowed to copy therefore we need to keep its objects being shared across all instances. Somehow I still think it is a waste to haveshared_ptr<T>manage each small object.This PR includes
unordered_set<string>to keep the strings other thanstd::vector<std::shared_ptr<std::string>>.unordered_set<string>is more straightforward and able to get rid of redundant duplicates automatically.drt_node_poolwrapping thevector<unique_ptr<drt_node>>and its instance is shared across all instances ofdrt_nodeto manage the lifetime of new drt_node instances.dynamic_routing_tableis to hold oneshared_ptr<dynamic_routing_table_data>to let one shared_ptr manage one big object other than multiple shared_ptrs manage multple small objects.This PR is posted as draft to let @matt-42 have a review first. Will squash to one single commit before final merge.