Frequently Asked Questions¶
This Section is a compilation of the most common questions via GitHub, chat, and mailing list.
Can I Encrypt CAF Communication?¶
Yes, by using the OpenSSL module (see Free Functions).
Can I Create Messages Dynamically?¶
Yes.
Usually, messages are created implicitly when sending messages but can also be created explicitly using make_message. In both cases, types and number of elements are known at compile time. To allow for fully dynamic message generation, CAF also offers message_builder:
message_builder mb;
// prefix message with some atom
mb.append(strings_atom::value);
// fill message with some strings
std::vector<std::string> strings{/*...*/};
for (auto& str : strings)
mb.append(str);
// create the message
message msg = mb.to_message();
What Debugging Tools Exist?¶
The scripts/ and tools/ directories contain some useful tools to aid in development and debugging.
scripts/atom.py converts integer atom values back into strings.
scripts/demystify.py replaces cryptic typed_mpi<...> templates with replies_to<...>::with<...> and atom_constant<...> with a human-readable representation of the actual atom.
scripts/caf-prof is an R script that generates plots from CAF profiler output.
caf-vec is a (highly) experimental tool that annotates CAF logs with vector timestamps. It gives you happens-before relations and a nice visualization via ShiViz.