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CAF: the C++ Actor Framework

CAF is an open source implementation of the actor model for C++ featuring lightweight & fast actor implementations, pattern matching for messages, network transparent messaging, and more.

Online Resources

• Homepage: https://www.actor-framework.org
• Developer Blog: https://www.actor-framework.org/blog
• Guides and Tutorials: https://www.cafcademy.com/articles
• Manual: https://actor-framework.readthedocs.io
• Doxygen: https://codedocs.xyz/actor-framework/actor-framework

Report Bugs / Get Help

• Open Issues on GitHub: https://github.com/actor-framework/actor-framework/issues/new
• Ask Questions on StackOverflow: https://stackoverflow.com/questions/ask?tags=c%2b%2b-actor-framework

Community

• Chat: https://gitter.im/actor-framework/chat
• Twitter: https://twitter.com/actor_framework
• User Mailing List: https://groups.google.com/d/forum/actor-framework

Get CAF

We currently officially maintain only the CAF package available on Homebrew.

More package managers are supported by community members:

• Conan
• FreeBSD Ports
• VCPKG

Get the Sources

git clone https://github.com/actor-framework/actor-framework.git
cd actor-framework

Build CAF from Source

CAF uses CMake as its build system of choice. To make building CAF more convenient from the command line, we provide a configure script that wraps the CMake invocation. The script only works on UNIX systems. On Windows, we recommend generating an MSVC project file via CMake for native builds.

Using the configure Script

The script is a convenient frontend for CMake. See configure -h for a list of available options. By default, the script creates a build directory and asks CMake to generate a Makefile. A build with default settings generally follows these steps:

./configure
cd build
make
make test [optional]
make install [as root, optional]

Using CMake

To generate a Makefile for building CAF with default settings, either use a CMake GUI or perform these steps on the command line:

mkdir build
cd build
cmake ..

After this step, cmake -LH prints the most useful configuration options for CAF, their default value, and a helptext.

Other CMake projects can add CAF as a dependency by using find_package and listing the required modules (e.g., core or io) . When installing CAF to a non-standard location, set CAF_ROOT prior to calling find_package.

Dependencies

• CMake (for building CAF)
• OpenSSL (only when building the OpenSSL module)

Supported Platforms

C++ is an evolving language. Compiler vendors constantly add more language and standard library features. Since CAF runs on many platforms, this means we need a policy that on the one hand ensures that we only use a widely supported subset of C++ and on the other hand that we naturally progress with the shifting landscape to eventually catch up to more recent C++ additions (in order to not "get stuck").

So instead of singling out individual compiler versions, we build CAF for each commit on all platforms that we currently deem relevant. Everything that passes our CI is "fair game".

Our CI covers Windows (latest MSVC release), macOS (latest Xcode release), FreeBSD (latest) and several Linux distributions (via the Docker images found here). For Linux, we aim to support the current releases (that still receive active support) for the major distributions. Note that we do not build on Linux distributions with rolling releases, because they generally provide more recent build tools than distributions with traditional release schedules and thus would only add redundancy.

Build Documentation Locally

• Building an offline version of the manual requires Sphinx:

  cd manual
  sphinx-build . html

• Building an offline version of the API reference documentation requires Doxygen (simply run the doxygen command at the root directory of the repository).

Scientific Use

If you use CAF in a scientific context, please use one of the following citations:

@inproceedings{cshw-nassp-13,
  author = {Dominik Charousset and Thomas C. Schmidt and Raphael Hiesgen and Matthias W{\"a}hlisch},
  title = {{Native Actors -- A Scalable Software Platform for Distributed, Heterogeneous Environments}},
  booktitle = {Proc. of the 4rd ACM SIGPLAN Conference on Systems, Programming, and Applications (SPLASH '13), Workshop AGERE!},
  pages = {87--96},
  month = {Oct.},
  year = {2013},
  publisher = {ACM},
  address = {New York, NY, USA}
}

@article{chs-rapc-16,
  author = {Dominik Charousset and Raphael Hiesgen and Thomas C. Schmidt},
  title = {{Revisiting Actor Programming in C++}},
  journal = {Computer Languages, Systems \& Structures},
  volume = {45},
  year = {2016},
  month = {April},
  pages = {105--131},
  publisher = {Elsevier}
}

You can find the papers online at http://dx.doi.org/10.1145/2541329.2541336 and http://dx.doi.org/10.1016/j.cl.2016.01.002.