jafarlihi / cppq Goto Github PK
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License: MIT License
Simple, reliable & efficient distributed task queue for C++17
License: MIT License
Your library looks neat. One downside I see is that it directly uses nlohmann::json. It would be nice if nlohmann::json was an optional dependency and if the main library just worked on std::string. This would allow various JSON libraries to be used or even other formats for messages.
You could require a cppq::transform
struct, which you could define in another header. That would allow nlohmann::json to be entirely optional and another implementation could be added instead.
Something like:
struct transform
{
template <class T>
std::string operator()(T& payload) {
nlohmann::json j = payload;
return j.dump();
}
};
You could then still have the exact same code:
cppq::Task NewEmailDeliveryTask(EmailDeliveryPayload payload) {
nlohmann::json j = payload;
return cppq::Task{TypeEmailDelivery, j, 10};
}
cppq::Task
here would just call transform
on the second argument.
transform
could be a function, but a struct is probably the better long term approach for more flexibility.
You can just predeclare struct transform;
in cppq.hpp so that the sequence of including headers doesn't matter.
You could automate receiving the message, but I think it would be simpler, cleaner, and more flexible to have the user parse the std::string returned to the client. It's not hard to call nlohmann::json::parse(task.payload);
This also gives the user control over how the message is parsed and when it is parsed.
Thanks for your work on this!
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