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actor-framework/chat

CAF: The C++ Actor Framework

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Dominik Charousset

@Neverlord

Not for this particular setup, but one the examples under message_passing should help you getting started: https://github.com/actor-framework/actor-framework/tree/master/examples/message_passing

JoaoMarinho

@JoaoAMarinho

I have already looked at the examples and could not find a way to solve this

Just want to know if an actor of this kind ""void parse_input(event_based_actor* self)"" can receive messages from other actors and how?

Dominik Charousset

@Neverlord

Well, you're not returning a behavior. Hence, this actor quits immediately after running the function body. You'd need to return a behavior instead of just returning void.

JoaoMarinho

@JoaoAMarinho

Ok thanks. But a behavior returning actor needs to return immediatly right? so i can´t be receiving user input before returning the handlers

Dominik Charousset

@Neverlord

How is this actor "receiving" user input anyway? If you call some blocking function, make sure to detach the actor. :)

JoaoMarinho

@JoaoAMarinho

From the terminal. What does detaching an actor do precisely?

Dominik Charousset

@Neverlord

Please look it up in the manual.

JoaoMarinho

@JoaoAMarinho

Ok thank you.

mustafma

@mustafma

Hi, can I define enum class as a result of the custom atom definition? Trying to use that in typed_actor class ? Doing this fails in build. Do I need to define an inspector for such cases ?

Dominik Charousset

@Neverlord

The atom macros define empty structs. If you wish to use an enum, than it's just a custom type to CAF that need an inspect.

mustafma

@mustafma

Thanks. I have tried this with no success:

Dominik Charousset

@Neverlord

Can you define "no success"? What's the actual issue? Aside from the code running into UB since it's not returning a value.

Cem Degirmenci

@sputnikcem_twitter

Hello everyone

Dominik Charousset

@Neverlord

Hi! 👋

Cem Degirmenci

@sputnikcem_twitter

I was reading the code of the framework, and would like to ask what is upstream and downstream messages?

in the scheduled_actor class one can get 4 types of queues, urgent, normal, upstream and downstream forexample

Dominik Charousset

@Neverlord

This only relates to streaming pipelines. Hopefully this helps to clean up the terminology: https://actor-framework.readthedocs.io/en/stable/Streaming.html.

But be aware that this is an experimental feature and it looks like it's soon replaces with something else.

Cem Degirmenci

@sputnikcem_twitter

thank you!

Dominik Charousset

@Neverlord

Hope it helps. :)

Krzysztof Wrzalik

@kyku

Hi, I'm trying to fix a strange segfault from CAF

It is triggered from message_data::~message_data() after my message handler has returned. The the problem is with meta.destroy(ptr); line, in which detroy() is basically a null function pointer.

Krzysztof Wrzalik

@kyku

ok, my fault

doncoolhoney

@doncoolhoney_twitter

My hello program code doesnt work anyone caould please help??
unction "mirror" returns incomplete type "caf::behavior" and alot of other errors..

can anyone pleaase guide to run hello worlld program steps..... i have compiled camke completely...

Dominik Charousset

@Neverlord

I think that's out of scope for a chat like this. But I'm sure you can find good CMake tutorials online. Incomplete type usually means you didn't include the proper headers or your include paths aren't correct.

Cem Degirmenci

@sputnikcem_twitter

Hi I have created an example to study the difference between request.then and request.await. I have a scoped actor which sends 5 messages to a master actor and this master actor in its behavior sends a message to a slave actor which returns the sum of 2 integer and sleeps for 1 seconds.

It is as expected i.e. if I use then I see that masters behaviors are activated without waiting for slave answers

the question is when I use <message_priority::high> await does not function after the first call

is this expected?

Cem Degirmenci

@sputnikcem_twitter

Cem Degirmenci

@sputnikcem_twitter

ah I see, if the master also sends the message with high priority the problem is solved

Cem Degirmenci

@sputnikcem_twitter

can one use OpenMP with the Actor framework? I can compile and run the code but can only get a single omp thread running

Dominik Charousset

@Neverlord

Regarding the high-prio: you shouldn't need to forward it with hight priority. Mind making a minimal example and open a GitHub issue?
OpenMP: be careful when combining CAF with any other framework that spins up a thread pool on its own. If both are busy, you pay for a lot of context switches by overbooking the CPU.

Cem Degirmenci

@sputnikcem_twitter

for the OpenMP question -fopenmp should be added to both compile and link flags in the CMakefile if anyone wants to use it

doncoolhoney

@doncoolhoney_twitter

Anyone have a short but good example of middleman in CAF..Please share.. because I am facing issues in publishing....

invalid use of incomplete type ‘class caf::io::middleman’

Any small example please!..

Dominik Charousset

@Neverlord

Incomplete type usually means you're only having a forward declaration, i.e., you're missing the include. An example for publish/remote_actor is here: https://github.com/actor-framework/actor-framework/blob/master/examples/remoting/distributed_calculator.cpp.

Cem Degirmenci

@sputnikcem_twitter

hi the system has a registry() function to reach the actor_registry, but where is the proxy_registry instance? I checked middleman.hpp as well under io but could not find it so far

Dominik Charousset

@Neverlord

The proxy registry isn't accessible from outside the BASP broker. It's only an implementation detail for holding the state required to represent remote actor.

Cem Degirmenci

@sputnikcem_twitter

ok then I need to keep my own data structure

kapilpipaliya

@kapilpipaliya

how to stream video data from one actor to many actors?

Dominik Charousset

@Neverlord

There's currently no readily-available binding to gRPC or other messaging libraries.

Nannnnnn

@Nannnnnn

Hi everyone, I got a problem when I try to use request method like this, do you know why? Thanks!

void my_send(event_based_actor src, actor dst, char* message)
{
src->request(dst, std::chrono::seconds(10), message);

}

Dominik Charousset

@Neverlord

That's not how you use request. :)
You're not telling it what to do with the response and you can't take an event-based actor as value. Have a look at the example: https://github.com/actor-framework/actor-framework/blob/master/examples/message_passing/request.cpp.

Nannnnnn

@Nannnnnn

@Neverlord Thanks for your comment! Is there any workaround for sending a message by indicating the sender like send_msg(sender, receiver, ...) or any other type of actor can achieve that? a typed actor?

Dominik Charousset

@Neverlord

Can you explain a bit more what you're trying to do? Statically typed actors only allow the compiler to run type-checks on your message. Sender information is always encoded in messages regardless.

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