Post on 16-Apr-2017
#Devoxx #AwesomeElixir @koenighotze
Bootstrap |> Elixir
EASY FUN FOR BUSY DEVELOPERS
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@koenighotze / David Schmitz
Senacor Technologies Programmer!
Bad, bad fighter!
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WET YOUR APPETITE FOR ELIXIR SHOW OFF SOME COOL FEATURES
CODE A DISTRIBUTED PIZZA PARLOUR
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学⼀一⻔门语⾔言，就是多⼀一个观察世界的窗户。To learn a language is to have one more window from which to look at the world
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Two minor caveats
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I AM THE JON SNOW OF ELIXIR AND ERLANG/OTP
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THIS IS NOT A README!
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YET ANOTHER PROGRAMMING LANGUANGE?
Y A P L
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Elixir in a Nutshell
+Elixir in a Nutshell
+
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Principle of Conciseness Principle of Consistency Principle of Flexibility
Why Ruby is awesome
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Battle-proven BEAM and OTP
Ever seen WhatsApp crash?
Reactive before Reactive-is-HipTm
Actors before Actors-are—HipTm
Why Erlang is awesome
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Why Clojure is awesome
Because Rich Hickey is always right
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WHY NOT JUST USE RUBY, ERLANG OR CLOJURE?
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It didn't take long, but pretty soon my gut feeling kicked in. This is good $hit. …, they both compile to instructions for the EVM
- Joe Armstrong (Creator of Erlang)
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Programmer focussed OTP Power + Ruby Love Functional but pragmatic
Standard Toolset
Why Elixir is awesome
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Erlang/OTP
ERLANG/BEAM TOOLS
LIBRARIES PATTERNS
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Elixir
ERLANG/BEAM TOOLS
LIBRARIES PATTERNS
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Pizza Parlour - Version 1“Take my money! I want a salami pizza!”
“I am hungry!!”
“3 €, please!”
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Pizza Parlour - Version 1 Demo
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WHAT ABOUT 99.9999999?
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Pillars of Resilience and ReliabilityMessage-passing between
isolated processes Automatic recovery and
monitoring Transparent distribution
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Elixir Power Tools
Messaging with GenServer modules Supervisor for transparent resilience
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Shared resources Shared state Shared stability
SHARED STATE
COMPUTATION COMPUTATION COMPUTATION
HEAVY WEIGHT PROCESS
COMPUTATION COMPUTATION COMPUTATION
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Light Weight Processes
MAILBOX
STATE
COMPUTATION
AsynchronousSynchronous
GENSERVER
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GenericServer in a Nutshell
loop(current_state): wait for message handle message send reply loop(new_state)
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GenericServer in a Nutshell
loop(current_state): wait for message handle message send reply loop(new_state)
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GenericServer in a Nutshell
loop(current_state): wait for message handle message send reply loop(new_state)
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GenericServer in a Nutshell
loop(current_state): wait for message handle message send reply loop(new_state)
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Architecture build around tiny Processes
PROCESS
PROCESS
PROCESS
PROCESS
PROCESS
PROCESS
PROCESS
PROCESS
PROCESS
PROCESS
PROCESS
HEAVY WEIGHT PROCESS
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Message driven Pizza - The request{:pizza, “Salami”}
handle_call({:pizza, “Salami”}, from, state)
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%{order_number: 123, price: 10.50}
Message driven Pizza - The reply
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Pizza Parlour - Version 2 Demo
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NOW REALLY, WHAT ABOUT
RESILIENCE???
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“HAVE YOU TRIED TURNING IT OFF AND ON AGAIN?”
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The WHAT IF scenario
{:pizza, “Salami”}
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Risk at the Bottom of the Supervision TreeAPPLICATION
SUPERVISOR
Here be dragons…
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APPLICATION
SUPERVISOR
Supervisors watch their Children
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APPLICATION
SUPERVISOR
Supervisors watch their Children
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APPLICATION
SUPERVISOR
Supervisors watch their Children
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Pizza Parlour - Version 3 Demo
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There is so much more
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Protocols for polymorphism
defimpl String.Chars do def to_string(bitmap), for: [Bitmap] do … end end
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Hygienic Macrosdefmacro unless(clause, do:expression) do quote do if(!unquote(clause) do unquote(expression)) end end end
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Hygienic Macrosdefmacro unless(clause, do:expression) do quote do if(!unquote(clause) do unquote(expression)) end end end
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Zero downtime Hot code replacement
def code_change(ver, old_state, extra) do new_state = … {:ok, new_state} end
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Real-time apps with Ecto and Phoenix
defmodule Video do def alphabetical(query) do from q in query, order_by: q.name end end
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Real-time apps with Ecto and Phoenix
def alphabetical(query) do …
Video |> Video.alphabetical |> Repo.all
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SHOULD WE ALL START BUILDING EVERYTHING
WITH ELIXIR?
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WELL….MAYBE NOT?!
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AND OF COURSE…
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MICROSERVICE AND CLOUD READY ;)
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New insights and ideas Clean patterns as part of the core Architecture and Tooling for IoT Vibrant and friendly Community
Come for OTP, stay for…
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Elixir Homepage, http://elixir-lang.org/
Dave Thomas, Programming Elixir
Fred Hebert, Stuff Goes Bad: Erlang in Anger
Do you want to know more?
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Thank you very much!<david.schmitz@senacor.com>