Examples!

Talk is cheap! Show me some code!

Have a look in Cookbook - How to Get Started too!

Some examples are located in examples/ directory. And there are convenient Makefile targets to call them, just use your Bash autocomplete when typing make example<TAB>:

1: Python to Erlang

Demonstrates how Python node can actively find a running Erlang node and connect to it by attempting to send a message.

Running (in two terminal tabs):

• Start Erlang node with erl -name erl@127.0.0.1 -setcookie COOKIE.

• (optional) Register your shell process as shell by executing in the Erlang shell: erlang:register(shell, self()).

• make example1 - will start a node at py@127.0.0.1 and using cookie COOKIE will try to connect to Erlang running at erl@127.0.0.1;

• (optional) Check whether Erlang shell received hello by typing flush().

2: Erlang to Python

Demonstrates how to run a named process on Python node. Erlang node will try and send message to it by name.

• make example2 - will register a process as my_process and you can send messages to it by name from Erlang;

• Start Erlang node with erl -name erl@127.0.0.1 -setcookie COOKIE.

• In Erlang shell try send something to my_process like this: {my_process, 'py@127.0.0.1'} ! {hello, 123, [<<"test">>, self()]}.

• In Python terminal tab observe log message about incoming data.

3 & 4: Calling/Batch Python

Examples are .erl files which demonstrate how remote notebook-style calls and batch calls will work with Erlang and Python.

• make pynode (same as make example2) to get a running Python node.

• make example3 or make example4 and observe what it prints.

5: Links and Monitors of Pyrlang Processes

Demonstrates Erlang remotely monitoring and linking to Pyrlang processes. A Python Process will trigger monitor and link messages when exiting.

• make example5a will start Erlang node.

• make example5b (in another terminal) will start Python Pyrlang node.

• Pyrlang node will send a message starting the test.

• Erlang node will spawn a test process, report its pid to Python node.

• Python node (now knowing the pid) will monitor the Erlang process.

• Python node will send a exit message to Erlang side, and observe the monitor message arriving back.

6 & 7: Links/Monitors of Erlang Processes

Demonstrates Pyrlang remotely linking to and monitoring an Erlang process.

Note

For linking demo use 'example6a' and 'example6b', for monitoring demo use 'example7a', 'example7b' Makefile targets.

• make example6a will start Erlang node.

• make example6b (in another terminal) will start Python Pyrlang node.

• Pyrlang node will send a message starting the test.

• Erlang node will spawn a test process, report its pid to Python node.

• Python node (now knowing the pid) will monitor the Erlang process.

• Python node will send a exit message to Erlang side, and observe the monitor message arriving back.

10: Elixir and GenServer

This example will demonstrate how to accept gen_server:call in your Python Process.

Running (in two terminal tabs):

• make example10a - will start Python part of Example 10 and start a GenServer example;

• make example10b - will start Elixir part of Example 10 and perform 2 gen_server:call's

• In Elixir terminal tab observe results for 1st and 2nd calls.

Note

Some examples require a client and a server, these have two parts: example A and example B.