From fac2474ac66cd9a561844b1a6a8f9a91aa45e160 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Thu, 22 Sep 2016 15:37:17 +0200
Subject: [PATCH] Add the rest of the damn presentation

---
 presentation.md       | 96 ++++++++++++++++++++++++++++++++++++++++---
 src/hello2.erl        |  2 +-
 src/hello_server.erl  | 12 ++++++
 src/hello_server2.erl | 36 ++++++++++++++++
 src/hello_sup.erl     | 24 +++++++++++
 5 files changed, 164 insertions(+), 6 deletions(-)
 create mode 100644 src/hello_server.erl
 create mode 100644 src/hello_server2.erl
 create mode 100644 src/hello_sup.erl

diff --git a/presentation.md b/presentation.md
index b61d68911..dfc914f3e 100644
--- a/presentation.md
+++ b/presentation.md
@@ -114,16 +114,102 @@ hello(Name) ->
 % 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.
+```
 
 ---
 
-## Drag & Drop images
+## [fit] Some issues with that ...
 
-### Simply *drop an image onto the Deckset window* and the Markdown you need to display the image is automatically created and *copied to the clipboard.*
+- What about unused messages?
+- What if the server crashes?
 
 ---
 
-* This works with both local files and web images
-* You don’t _need_ to drag the file, you can also type the Markdown yourself if you know how
+## [fit] Part 2: Open Telecom Platform
 
-![left,filtered](http://deckset-assets.s3-website-us-east-1.amazonaws.com/colnago1.jpg)
+### **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
+
+![inline](http://erlang.org/doc/design_principles/sup6.gif)
+
+^ 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 out for the Oslo BEAM meetup group
diff --git a/src/hello2.erl b/src/hello2.erl
index 42406919e..2d1f6c84c 100644
--- a/src/hello2.erl
+++ b/src/hello2.erl
@@ -2,7 +2,7 @@
 -export([hello/1]).
 
 hello(Name) ->
-    io:format("Hello ~s!~n", [Name]).
+    io:format("Hey ~s!~n", [Name]).
 
 % 3> c(hello2).
 % {ok,hello2}
diff --git a/src/hello_server.erl b/src/hello_server.erl
new file mode 100644
index 000000000..01df14ac5
--- /dev/null
+++ b/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/src/hello_server2.erl b/src/hello_server2.erl
new file mode 100644
index 000000000..24bb934ee
--- /dev/null
+++ b/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/src/hello_sup.erl b/src/hello_sup.erl
new file mode 100644
index 000000000..7fee0928c
--- /dev/null
+++ b/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]}.