Download as PDF, PPTX
![pid = spawn(ShoutyEcho, :echo_loop, [])
pid <- {self, "Your name here"}
receive do
{:ok, response} ->
IO.puts response
after 500 ->
IO.puts "Done"
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-16-320.jpg)
![pid = spawn(ShoutyEcho, :echo_loop, [])
pid <- {self, "Your name here"}
receive do
{:ok, response} ->
IO.puts response
after 500 ->
IO.puts "Done"
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-17-320.jpg)
![pid = spawn(ShoutyEcho, :echo_loop, [])
pid <- {self, "Your name here"}
receive do
{:ok, response} ->
IO.puts response
after 500 ->
IO.puts "Done"
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-18-320.jpg)
![pid = spawn(ShoutyEcho, :echo_loop, [])
pid <- {self, "Your name here"}
receive do
{:ok, response} ->
IO.puts response
after 500 ->
IO.puts "Done"
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-19-320.jpg)
![-module(graycode).
-export([given/3, main/0]).
given([the, leds, read, _Input], State, _) ->
{ok, State}.
main() ->
cucumberl:run("./features/graycode.feature").](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-22-320.jpg)
![---------NO-STEP--------
a step definition snippet...
'when'([i,reset,the,counter], State, _) ->
undefined.](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-25-320.jpg)
![---------NO-STEP--------
a step definition snippet...
'when'([i,reset,the,counter], State, _) ->
undefined.](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-26-320.jpg)
![-module(graycode).
-export([given/3, 'when'/3, main/0]).
%% ...
'when'([i, reset, the, counter], State, _) ->
{ok, State}.
%% ...](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-27-320.jpg)
!['when'([i, reset, the, counter], State, _) ->
{ok, State};
'when'([i, press, the, button], State, _) ->
{ok, State}.](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-33-320.jpg)
![-module(graycode).
-export([given/3, main/0]).
given([the, leds, read, _Input], State, _) ->
{ok, State}.
main() ->
cucumberl:run("./features/graycode.feature").](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-39-320.jpg)
![defmodule :graycode do
def given([:the, :leds, :read, input], _state, _) do
{:ok, input}
end
def main() do
:cucumberl.run("./features/graycode.feature")
end
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-40-320.jpg)
![---------NO-STEP--------
a step definition snippet...
'when'([i,reset,the,counter], State, _) ->
undefined.](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-45-320.jpg)
![---------NO-STEP--------
a step definition snippet...
'when'([i,reset,the,counter], State, _) ->
undefined.](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-46-320.jpg)
![def 'when'([:i, :reset, :the, :counter], _state, _) do
{:ok, '...'}
end
➡
== Compilation error on file src/graycode.ex ==
** (SyntaxError) ./src/graycode.ex:6: syntax error
before: ')'](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-47-320.jpg)
![def when_([:i, :press, :the, :button], state, _) do
{:ok, _next(state)}
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-54-320.jpg)
![def then([:the, :leds, :should, :read, expected],
state, _) do
{expected === state, state}
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-56-320.jpg)
![def when_([:i, :press, :the, :button], state, _) do
{:ok, _next(state)}
end
defp _next(leds) do
case leds do
'...' -> '..o'
'..o' -> '.oo'
'.oo' -> '.o.'
'.o.' -> 'oo.'
'oo.' -> 'ooo'
'ooo' -> 'o.o'
'o.o' -> 'o..'
'o..' -> '...'
end
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/85/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-58-320.jpg)
![pid = spawn(ShoutyEcho, :echo_loop, [])
pid <- {self, "Your name here"}
receive do
{:ok, response} ->
IO.puts response
after 500 ->
IO.puts "Done"
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-16-2048.jpg)
![pid = spawn(ShoutyEcho, :echo_loop, [])
pid <- {self, "Your name here"}
receive do
{:ok, response} ->
IO.puts response
after 500 ->
IO.puts "Done"
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-17-2048.jpg)
![pid = spawn(ShoutyEcho, :echo_loop, [])
pid <- {self, "Your name here"}
receive do
{:ok, response} ->
IO.puts response
after 500 ->
IO.puts "Done"
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-18-2048.jpg)
![pid = spawn(ShoutyEcho, :echo_loop, [])
pid <- {self, "Your name here"}
receive do
{:ok, response} ->
IO.puts response
after 500 ->
IO.puts "Done"
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-19-2048.jpg)
![-module(graycode).
-export([given/3, main/0]).
given([the, leds, read, _Input], State, _) ->
{ok, State}.
main() ->
cucumberl:run("./features/graycode.feature").](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-22-2048.jpg)
![---------NO-STEP--------
a step definition snippet...
'when'([i,reset,the,counter], State, _) ->
undefined.](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-25-2048.jpg)
![---------NO-STEP--------
a step definition snippet...
'when'([i,reset,the,counter], State, _) ->
undefined.](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-26-2048.jpg)
![-module(graycode).
-export([given/3, 'when'/3, main/0]).
%% ...
'when'([i, reset, the, counter], State, _) ->
{ok, State}.
%% ...](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-27-2048.jpg)
!['when'([i, reset, the, counter], State, _) ->
{ok, State};
'when'([i, press, the, button], State, _) ->
{ok, State}.](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-33-2048.jpg)
![-module(graycode).
-export([given/3, main/0]).
given([the, leds, read, _Input], State, _) ->
{ok, State}.
main() ->
cucumberl:run("./features/graycode.feature").](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-39-2048.jpg)
![defmodule :graycode do
def given([:the, :leds, :read, input], _state, _) do
{:ok, input}
end
def main() do
:cucumberl.run("./features/graycode.feature")
end
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-40-2048.jpg)
![---------NO-STEP--------
a step definition snippet...
'when'([i,reset,the,counter], State, _) ->
undefined.](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-45-2048.jpg)
![---------NO-STEP--------
a step definition snippet...
'when'([i,reset,the,counter], State, _) ->
undefined.](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-46-2048.jpg)
![def 'when'([:i, :reset, :the, :counter], _state, _) do
{:ok, '...'}
end
➡
== Compilation error on file src/graycode.ex ==
** (SyntaxError) ./src/graycode.ex:6: syntax error
before: ')'](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-47-2048.jpg)
![def when_([:i, :press, :the, :button], state, _) do
{:ok, _next(state)}
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-54-2048.jpg)
![def then([:the, :leds, :should, :read, expected],
state, _) do
{expected === state, state}
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-56-2048.jpg)
![def when_([:i, :press, :the, :button], state, _) do
{:ok, _next(state)}
end
defp _next(leds) do
case leds do
'...' -> '..o'
'..o' -> '.oo'
'.oo' -> '.o.'
'.o.' -> 'oo.'
'oo.' -> 'ooo'
'ooo' -> 'o.o'
'o.o' -> 'o..'
'o..' -> '...'
end
end](https://image.slidesharecdn.com/cukeupnyciandeesonelixirerlangandcucumberl-131003044011-phpapp01/75/Cukeup-nyc-ian-dees-on-elixir-erlang-and-cucumberl-58-2048.jpg)
Uploaded bySkills Matter
Cukeup nyc ian dees on elixir, erlang, and cucumberl
The document discusses the benefits of using Elixir for concurrency, highlighting its actor-style concurrency model and pattern matching capabilities, making it safer and easier compared to traditional methods using locks. It includes examples of implementing a feature for managing LED states via the Cucumber testing framework, demonstrating how to define behaviors and run tests in Elixir. Additionally, it notes some limitations of the cucumberl framework in relation to the Elixir runtime.
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Cukeup nyc ian dees on elixir, erlang, and cucumberl
- 1. Cucumber and Elixir IanDees • @undees CukeUp! NYC 2013
- 2. Why Elixir? The sadstate of concurrency
- 3. int HandleMessage(MessageType type, unsignedlong arg1, unsigned long arg2) { switch (type) { case SOME_MESSAGE: INFO* info = *((INFO*)arg2); doSomethingWith(info.field); return MEANINGFUL_ERROR_CODE; // ... } // ... }
- 4. Semaphore& s =resourceSemaphore(); s.acquire(); laboriouslyCopyDataFromResource(); s.release(); doSomethingWithData();
- 5. • Dangerous andhard-to-use message types • Corruption- and deadlock-prone locks
- 6. It doesn’t haveto be this way!
- 7. A taste ofElixir http://elixir-lang.org Ruby style, Erlang substance
- 8.
- 9. defmodule Ackermann do defack(0, n), do: n + 1 def ack(m, 0), do: ack(m - 1, 1) def ack(m, n), do: ack(m - 1, ack(m, n - 1)) end IO.puts Ackermann.ack(3, 9)
- 10.
- 11. defmodule ShoutyEcho do defecho_loop do receive do {sender, msg} -> sender <- {:ok, String.upcase(msg)} echo_loop end end end
- 12. defmodule ShoutyEcho do defecho_loop do receive do {sender, msg} -> sender <- {:ok, String.upcase(msg)} echo_loop end end end
- 13. defmodule ShoutyEcho do defecho_loop do receive do {sender, msg} -> sender <- {:ok, String.upcase(msg)} echo_loop end end end
- 14. defmodule ShoutyEcho do defecho_loop do receive do {sender, msg} -> sender <- {:ok, String.upcase(msg)} echo_loop end end end
- 15. defmodule ShoutyEcho do defecho_loop do receive do {sender, msg} -> sender <- {:ok, String.upcase(msg)} echo_loop end end end
- 16. pid = spawn(ShoutyEcho,:echo_loop, []) pid <- {self, "Your name here"} receive do {:ok, response} -> IO.puts response after 500 -> IO.puts "Done" end
- 17. pid = spawn(ShoutyEcho,:echo_loop, []) pid <- {self, "Your name here"} receive do {:ok, response} -> IO.puts response after 500 -> IO.puts "Done" end
- 18. pid = spawn(ShoutyEcho,:echo_loop, []) pid <- {self, "Your name here"} receive do {:ok, response} -> IO.puts response after 500 -> IO.puts "Done" end
- 19. pid = spawn(ShoutyEcho,:echo_loop, []) pid <- {self, "Your name here"} receive do {:ok, response} -> IO.puts response after 500 -> IO.puts "Done" end
- 20.
- 21. Feature: Gray Code Scenario:Reset Given the LEDs read "ooo"
- 22. -module(graycode). -export([given/3, main/0]). given([the, leds,read, _Input], State, _) -> {ok, State}. main() -> cucumberl:run("./features/graycode.feature").
- 23. $ cucumberl Feature: GrayCode Scenario: Reset Given the LEDs read "ooo" 1 scenarios 1 steps
- 24. Feature: Gray Code Scenario:Reset Given the LEDs read "ooo" When I reset the counter
- 25. ---------NO-STEP-------- a step definitionsnippet... 'when'([i,reset,the,counter], State, _) -> undefined.
- 26. ---------NO-STEP-------- a step definitionsnippet... 'when'([i,reset,the,counter], State, _) -> undefined.
- 27. -module(graycode). -export([given/3, 'when'/3, main/0]). %%... 'when'([i, reset, the, counter], State, _) -> {ok, State}. %% ...
- 28. $ cucumberl Feature: GrayCode Scenario: Reset Given the LEDs read "ooo" When I reset the counter 1 scenarios 2 steps
- 29. I know whatyou’re thinking...
- 30. What happens withthe next “When” step?
- 31. Feature: Gray Code Scenario:... ... When I reset the counter Scenario: ... ... When I press the button
- 32.
- 33. 'when'([i, reset, the,counter], State, _) -> {ok, State}; 'when'([i, press, the, button], State, _) -> {ok, State}.
- 34. $ find .-type f ./ebin/graycode.beam ./features/graycode.feature ./src/graycode.erl
- 35. $ find .-type f ./ebin/graycode.beam ./features/graycode.feature ./src/graycode.erl
- 36. Just a .beamfile!
- 37. And now inElixir!
- 38. Feature: Gray Code Scenario:Reset Given the LEDs read "ooo"
- 39. -module(graycode). -export([given/3, main/0]). given([the, leds,read, _Input], State, _) -> {ok, State}. main() -> cucumberl:run("./features/graycode.feature").
- 40. defmodule :graycode do defgiven([:the, :leds, :read, input], _state, _) do {:ok, input} end def main() do :cucumberl.run("./features/graycode.feature") end end
- 41.
- 42. $ find .-type f ./ebin/graycode.beam ./features/graycode.feature ./src/graycode.ex
- 43. $ cucumberl Feature: GrayCode Scenario: Reset Given the LEDs read "ooo" 1 scenarios 1 steps
- 44. Feature: Gray Code Scenario:Reset Given the LEDs read "ooo" When I reset the counter
- 45. ---------NO-STEP-------- a step definitionsnippet... 'when'([i,reset,the,counter], State, _) -> undefined.
- 46. ---------NO-STEP-------- a step definitionsnippet... 'when'([i,reset,the,counter], State, _) -> undefined.
- 47. def 'when'([:i, :reset,:the, :counter], _state, _) do {:ok, '...'} end ➡ == Compilation error on file src/graycode.ex == ** (SyntaxError) ./src/graycode.ex:6: syntax error before: ')'
- 48.
- 49.
- 50. %% cucumberl_gen.erl When =process_clauses('when', lists:reverse( sets:to_list(dict:fetch('when', Dict)))), ➡ When_ = process_clauses(when_, lists:reverse( sets:to_list(dict:fetch(when_, Dict)))),
- 51. %% cucumberl_gen.erl When =process_clauses('when', lists:reverse( sets:to_list(dict:fetch('when', Dict)))), ➡ When_ = process_clauses(when_, lists:reverse( sets:to_list(dict:fetch(when_, Dict)))),
- 52. %% cucumberl_parser.erl string_to_atoms(StrWords) -> lists:map(fun(Y) -> list_to_atom(string:to_lower(Y)) end, string:tokens(StrWords, " ")). ➡ list_to_valid_atom("when") -> list_to_atom("when_"); list_to_valid_atom(Str) -> list_to_atom(Str). string_to_atoms(StrWords) -> lists:map(fun (Y) -> list_to_valid_atom(string:to_lower(Y)) end, string:tokens(StrWords, " ")).
- 53. %% cucumberl_parser.erl string_to_atoms(StrWords) -> lists:map(fun(Y) -> list_to_atom(string:to_lower(Y)) end, string:tokens(StrWords, " ")). ➡ list_to_valid_atom("when") -> list_to_atom("when_"); list_to_valid_atom(Str) -> list_to_atom(Str). string_to_atoms(StrWords) -> lists:map(fun (Y) -> list_to_valid_atom(string:to_lower(Y)) end, string:tokens(StrWords, " ")).
- 54. def when_([:i, :press,:the, :button], state, _) do {:ok, _next(state)} end
- 55. $ cucumberl Feature: GrayCode Scenario: Reset Given the LEDs read "ooo" When I reset the counter 1 scenarios 2 steps
- 56. def then([:the, :leds,:should, :read, expected], state, _) do {expected === state, state} end
- 57. Scenario Outline: Counter Giventhe LEDs read "<n>" When I press the button Then the LEDs should read "<nplus1>" Examples: | n | nplus1 | | ... | ..o | | ..o | .oo | | .oo | .o. | | .o. | oo. | | oo. | ooo | | ooo | o.o | | o.o | o.. | | o.. | ... |
- 58. def when_([:i, :press,:the, :button], state, _) do {:ok, _next(state)} end defp _next(leds) do case leds do '...' -> '..o' '..o' -> '.oo' '.oo' -> '.o.' '.o.' -> 'oo.' 'oo.' -> 'ooo' 'ooo' -> 'o.o' 'o.o' -> 'o..' 'o..' -> '...' end end
- 59.
- 60. 1. Cucumberl hasno idea about the Elixir runtime
- 61. 2.Who will dowhat about When?
- 62.