This document describes the architecture of a distributed application in Erlang using supervision trees, behaviors like gen_server, gen_fsm, and gen_event, and the application module. It shows how to load and start the echo application which contains a supervisor that starts an echo server process to handle echo requests, with the server monitoring for slang words.

2. Large scale
Fault Tolerant
Distributed application

3. Supervision tree

4. Behaviour

5. Non functional code

6. Functional Code

7. application
gen_server (client/server)
gen_fsm (finite state machine)
gen_event (event handling)
supervisor

9. Event Handler
slang_event_handler.erl

10. echo_server.erl

11. superVISOR
echo_supervisor.erl

12. Application
echo_app.erl echo.app

13. 2> application:load(echo).
ok
3> application:loaded_applications().
[{echo,"A dummy echo server with a simple slang detection :p", "0.0.1"},
{kernel,"ERTS CXC 138 10","2.14.3"},
{sasl,"SASL CXC 138 11","2.1.9.3"},
{stdlib,"ERTS CXC 138 10","1.17.3"}]
4> application:start(echo).
Starting supervisor.
Alarm handler switched.
Supervisor configuration:
{ok, {{one_for_one, 3, 10}, [{echo_server1,
{echo_server,start_link,[]},
permanent,5000,worker,[echo_server]}]}}
echo_server starting
ok
5> echo_server:echo("fuck you son of a bitch").
=INFO REPORT==== 12-Aug-2012::18:26:23 ===
Don't send slangs mother fucker!
=INFO REPORT==== 12-Aug-2012::18:26:23 ===
Don't send slangs son of a bitch!
"fuck you son of a bitch"

14. Monitoring

15. Thank you!
toff63