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diff --git a/presentations/erlang-2016/presentation.md b/presentations/erlang-2016/presentation.md deleted file mode 100644 index 526564b88268..000000000000 --- a/presentations/erlang-2016/presentation.md +++ /dev/null @@ -1,222 +0,0 @@ -slidenumbers: true -Erlang. -====== - -### Fault-tolerant, concurrent programming. - ---- - -## A brief history of Erlang - ---- - - - - -^ Telefontornet in Stockholm, around 1890. Used until 1913. - ---- - - - -^ Telephones were operated manually at Switchboards. Anyone old enough to remember? I'm certainly not. - ---- - - - -^ Eventually we did that in software, and we got better at it over time. Ericsson AXD 301, first commercial Erlang switch. But lets take a step back. - ---- - -## Phone switches must be ... - -Highly concurrent - -Fault-tolerant - -Distributed - -(Fast!) - - - ---- - -## ... and so is Erlang! - ---- - -## Erlang as a whole: - -- Unique process model (actors!) -- Built-in fault-tolerance & error handling -- Distributed processes -- Three parts! - ---- - -## Part 1: Erlang, the language - -- Functional -- Prolog-inspired syntax -- Everything is immutable -- *Extreme* pattern-matching - ---- -### Hello Joe - -```erlang -hello_joe. -``` - ---- -### Hello Joe - -```erlang --module(hello1). --export([hello_joe/0]). - -hello_joe() -> - hello_joe. -``` - ---- -### Hello Joe - -```erlang --module(hello1). --export([hello_joe/0]). - -hello_joe() -> - hello_joe. - -% 1> c(hello1). -% {ok,hello1} -% 2> hello1:hello_joe(). -% hello_joe -``` - ---- -### Hello Joe - -```erlang --module(hello2). --export([hello/1]). - -hello(Name) -> - io:format("Hello ~s!~n", [Name]). - -% 3> c(hello2). -% {ok,hello2} -% 4> hello2:hello("Joe"). -% Hello Joe! -% ok -``` - ---- - -## [fit] Hello ~~world~~ Joe is boring! -## [fit] Lets do it with processes. - ---- -### Hello Server - -```erlang --module(hello_server). --export([start_server/0]). - -start_server() -> - spawn(fun() -> server() end). - -server() -> - receive - {greet, Name} -> - io:format("Hello ~s!~n", [Name]), - server() - end. -``` - ---- - -## [fit] Some issues with that ... - -- What about unused messages? -- What if the server crashes? - ---- - -## [fit] Part 2: Open Telecom Platform - -### **It's called Erlang/OTP for a reason.** - ---- - -# OTP: An Application Framework - -- Supervision - keep processes alive! - -- OTP Behaviours - common process patterns - -- Extensive standard library - -- Error handling, debuggers, testing, ... - -- Lots more! - -^ Standard library includes lots of things from simple network libraries over testing frameworks to cryptography, complete LDAP clients etc. - ---- - -# Supervision - - - -^ Supervision keeps processes alive, different restart behaviours, everything should be supervised to avoid "process" (and therefore memory) leaks - ---- - -# OTP Behaviours - -* `gen_server` -* `gen_statem` -* `gen_event` -* `supervisor` - -^ gen = generic. explain server, explain statem, event = event handling with registered handlers, supervisor ... - ---- - -`gen_server` - ---- - -## [fit] Part 3: BEAM - -### Bogdan/Bjørn Erlang Abstract machine - ---- - -## A VM for Erlang - -* Many were written, BEAM survived -* Concurrent garbage-collection -* Lower-level bytecode than JVM -* Very open to new languages - (Elixir, LFE, Joxa, ...) - ---- - -## What next? - -* Ole's talk, obviously! -* Learn You Some Erlang! - www.learnyousomeerlang.com -* Watch *Erlang the Movie* -* (soon!) Join the Oslo BEAM meetup group - ---- - -# [fit] Questions? - -`@tazjin` |