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| -rw-r--r-- | users/tazjin/presentations/erlang-2016/README.md | 6 | ||||
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| -rw-r--r-- | users/tazjin/presentations/erlang-2016/presentation.pdf | bin | 0 -> 1777976 bytes | |||
| -rw-r--r-- | users/tazjin/presentations/erlang-2016/src/hello.erl | 5 | ||||
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| -rw-r--r-- | users/tazjin/presentations/erlang-2016/src/hello_server.erl | 12 | ||||
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diff --git a/users/tazjin/presentations/erlang-2016/.skip-subtree b/users/tazjin/presentations/erlang-2016/.skip-subtree new file mode 100644 index 000000000000..e69de29bb2d1 --- /dev/null +++ b/users/tazjin/presentations/erlang-2016/.skip-subtree diff --git a/users/tazjin/presentations/erlang-2016/README.md b/users/tazjin/presentations/erlang-2016/README.md new file mode 100644 index 000000000000..e1b6c83b99cc --- /dev/null +++ b/users/tazjin/presentations/erlang-2016/README.md @@ -0,0 +1,6 @@ +These are the slides for a presentation I gave for the Oslo javaBin meetup in +2016. + +Unfortunately there is no recording of the presentation due to a technical error +(video was recorded, but no audio). This is a bit of a shame because I think +these are some of the best slides I've ever made. diff --git a/users/tazjin/presentations/erlang-2016/presentation.md b/users/tazjin/presentations/erlang-2016/presentation.md new file mode 100644 index 000000000000..526564b88268 --- /dev/null +++ b/users/tazjin/presentations/erlang-2016/presentation.md @@ -0,0 +1,222 @@ +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` diff --git a/users/tazjin/presentations/erlang-2016/presentation.pdf b/users/tazjin/presentations/erlang-2016/presentation.pdf new file mode 100644 index 000000000000..ec8d996704b2 --- /dev/null +++ b/users/tazjin/presentations/erlang-2016/presentation.pdf Binary files differdiff --git a/users/tazjin/presentations/erlang-2016/src/hello.erl b/users/tazjin/presentations/erlang-2016/src/hello.erl new file mode 100644 index 000000000000..56404a0c5a20 --- /dev/null +++ b/users/tazjin/presentations/erlang-2016/src/hello.erl @@ -0,0 +1,5 @@ +-module(hello). +-export([hello_joe/0]). + +hello_joe() -> + hello_joe. diff --git a/users/tazjin/presentations/erlang-2016/src/hello1.erl b/users/tazjin/presentations/erlang-2016/src/hello1.erl new file mode 100644 index 000000000000..ca78261399e1 --- /dev/null +++ b/users/tazjin/presentations/erlang-2016/src/hello1.erl @@ -0,0 +1,5 @@ +-module(hello1). +-export([hello_joe/0]). + +hello_joe() -> + hello_joe. diff --git a/users/tazjin/presentations/erlang-2016/src/hello2.erl b/users/tazjin/presentations/erlang-2016/src/hello2.erl new file mode 100644 index 000000000000..2d1f6c84c401 --- /dev/null +++ b/users/tazjin/presentations/erlang-2016/src/hello2.erl @@ -0,0 +1,11 @@ +-module(hello2). +-export([hello/1]). + +hello(Name) -> + io:format("Hey ~s!~n", [Name]). + +% 3> c(hello2). +% {ok,hello2} +% 4> hello2:hello("Joe"). +% Hello Joe! +% ok diff --git a/users/tazjin/presentations/erlang-2016/src/hello_server.erl b/users/tazjin/presentations/erlang-2016/src/hello_server.erl new file mode 100644 index 000000000000..01df14ac57d5 --- /dev/null +++ b/users/tazjin/presentations/erlang-2016/src/hello_server.erl @@ -0,0 +1,12 @@ +-module(hello_server). +-export([start_server/0, server/0]). + +start_server() -> + spawn(fun() -> server() end). + +server() -> + receive + {greet, Name} -> + io:format("Hello ~s!~n", [Name]), + hello_server:server() + end. diff --git a/users/tazjin/presentations/erlang-2016/src/hello_server2.erl b/users/tazjin/presentations/erlang-2016/src/hello_server2.erl new file mode 100644 index 000000000000..24bb934ee503 --- /dev/null +++ b/users/tazjin/presentations/erlang-2016/src/hello_server2.erl @@ -0,0 +1,36 @@ +-module(hello_server2). +-behaviour(gen_server). +-compile(export_all). + +%%% Start callback for supervisor +start_link() -> + gen_server:start_link({local, ?MODULE}, ?MODULE, [], []). + +%%% gen_server callbacks + +init([]) -> + {ok, sets:new()}. + +handle_call({greet, Name}, _From, State) -> + io:format("Hello ~s!~n", [Name]), + NewState = sets:add_element(Name, State), + {reply, ok, NewState}; + +handle_call({bye, Name}, _From, State) -> + io:format("Goodbye ~s!~n", [Name]), + NewState = sets:del_element(Name, State), + {reply, ok, NewState}. + +terminate(normal, State) -> + [io:format("Goodbye ~s!~n", [Name]) || Name <- State], + ok. + +%%% Unused gen_server callbacks +code_change(_OldVsn, State, _Extra) -> + {ok, State}. + +handle_info(_Info, State) -> + {noreply, State}. + +handle_cast(_Request, State) -> + {noreply, State}. diff --git a/users/tazjin/presentations/erlang-2016/src/hello_sup.erl b/users/tazjin/presentations/erlang-2016/src/hello_sup.erl new file mode 100644 index 000000000000..7fee0928c575 --- /dev/null +++ b/users/tazjin/presentations/erlang-2016/src/hello_sup.erl @@ -0,0 +1,24 @@ +-module(hello_sup). +-behaviour(supervisor). +-export([start_link/0, init/1]). + +%%% Module API + +start_link() -> + supervisor:start_link({local, ?MODULE}, ?MODULE, []). + +%%% Supervisor callbacks + +init([]) -> + Children = [hello_spec()], + {ok, { {one_for_one, 5, 10}, Children}}. + +%%% Private + +hello_spec() -> + #{id => hello_server2, + start => {hello_server2, start_link, []}, + restart => permanent, + shutdown => 5000, + type => worker, + module => [hello_server2]}. |