#devoxxfr #ngjava @sebastienpertus @agoncal
Enterprise Java MicroProfile
TypeScript and Angular
Sebastien Pertus
Antonio Goncalves
#devoxxfr #ngjava @sebastienpertus @agoncal
Agenda
• Enterprise Java MicroProfile
• TypeScript
• Docker
• Angular 2
• Break
• Exposing & consuming REST APIs with Angular 2
• Tips and tricks:
• APIs, Swagger, Cors, Hateoas, Etag, JWT, Scaling
Ask questions
#devoxxfr #ngjava @sebastienpertus @agoncal
Sebastien Pertus
• Microsoft Technical Evangelist
• OSS Lover
• Full Stack developer
• Node.JS & .Net Core advocate
• SQL Server man
• Develops on Windows (yeah yeah)
#devoxxfr #ngjava @sebastienpertus @agoncal
Antonio Goncalves
• Java Champion
• Loves back-end
• Hates front-end
• Develops on Mac
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
The Conference App
#devoxxfr #ngjava @sebastienpertus @agoncal
Demo Time !
The Conference App
https://github.com/agoncal/agoncal-
application-conference
#devoxxfr #ngjava @sebastienpertus @agoncal
Optimizing Enterprise Javafor a Microservices Architecture
#devoxxfr #ngjava @sebastienpertus @agoncal
Fundamental Shifts in Computing
Cloud
Microservices
Reduce time to market
Address unpredictable loads
Pay as you go
Containerization
Deliver new features more quickly
Smaller, more agile teams
Deliver business features as discrete services
Scale services independently
#devoxxfr #ngjava @sebastienpertus @agoncal
• Began as a of independent discussions
• Many “microservices” efforts exist in Java EE
• WildFly Swarm
• WebSphere Liberty
• Payara
• TomEE
• New features to address microservices architectures
• Java EE already being used for microservices…
• ...but we can do better
MicroProfile Background
#devoxxfr #ngjava @sebastienpertus @agoncal
Release Schedule
Sep 2016
MicroProfile
1.0
Q4 2016 2017 2017
Move to
Foundation
MicroProfile
1.1
MicroProfile
1.2
JAX-RS
CDI
JSON-P
#devoxxfr #ngjava @sebastienpertus @agoncal
MicroProfile 1.1 Underway
Security: JWT Token Exchange
Health Check
Configuration
Fault Tolerance
Second Quarter
2017!
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
WildFly Swarm
• Based on good old JBoss AS
• « Rightsize your services »
• Bundles several fractions
• Java EE
• Netflix OSS (Ribbon, Hystrix, RxJava)
• Spring
• Logstash
• Swagger
• ...
#devoxxfr #ngjava @sebastienpertus @agoncal
Setting up Swarm and MicroProfile
<profile>
<id>swarm</id>
<dependencies><dependency>
<groupId>org.wildfly.swarm</groupId>
<artifactId>microprofile</artifactId>
</dependency></dependencies>
<build>
<plugins><plugin>
<groupId>org.wildfly.swarm</groupId>
<artifactId>wildfly-swarm-plugin</artifactId>
</plugin></plugins>
</build>
</profile>
#devoxxfr #ngjava @sebastienpertus @agoncal
Demo Time !
Skinny War
Fat Jar
#devoxxfr #ngjava @sebastienpertus @agoncal
TypeScript:
JavaScript that
Scales
#devoxxfr #ngjava @sebastienpertus @agoncal
BRENDAN EICH ANDERS HEJLSBERG
Do you know those guys ?
Javascript creator
CTO / CEO Mozilla Foundation
Brave Software CEO
C# creator
Technical Fellow @ Microsoft
TypeScript creator and lead team
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
ES6 / EcmaScript 2015 / ES2015
ES6 is the most
important update
of JavaScript
Brendan Eich : - “We want to go faster. “
- “Every year, a new spec that will be shipped in nighty versions of moderns browsers”
#devoxxfr #ngjava @sebastienpertus @agoncal
Ecmascript evolution
ES 8
ES 7 (ES 2016)
ES 6(ES 2015)
ES 5
ES 3Core features
1997 ~~ 1999
new functions
strict mode, json
2009
class, promises, generators, arrow
functions, new syntax and
concepts …
2015
Exponential (**), array.includes,
2016
#devoxxfr #ngjava @sebastienpertus @agoncal
Rise of the transpilers: Typescript 2.0
#devoxxfr #ngjava @sebastienpertus @agoncal
TRANSPILER COMPILER
Transpiler vs Compiler
is a specific term for taking source code written in one language and transforming into another language that has a similar level of abstraction
TypeScript (subclass of JavaScript) to JavaScript
is the general term for taking source code written in one language and transforming into another
C# to IL
Java to ByteCode
"CoffeeScript is to Ruby as TypeScript is to Java/C#/C++." - Luke Hoban
Reference : Steve Fenton – 2012 - https://www.stevefenton.co.uk/2012/11/compiling-vs-transpiling
#devoxxfr #ngjava @sebastienpertus @agoncal
A statically typed superset of
JavaScript
that compiles to plain JavaScript.
Oh wait … that transpiles
B R O W S E R
H O S T
O S
#devoxxfr #ngjava @sebastienpertus @agoncal
Open Source
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
The feature gap
#devoxxfr #ngjava @sebastienpertus @agoncal
TypeScript IDE
#devoxxfr #ngjava @sebastienpertus @agoncal
One year, four releases
1.5
1.6
1.7
1.8
#devoxxfr #ngjava @sebastienpertus @agoncal
TypeScript 2.0
• Control flow based type analysis
• Non-nullable types
• Async/await downlevel support
• Readonly properties
• Private and protected Constructor
• Type “never”
#devoxxfr #ngjava @sebastienpertus @agoncal
TypeScript 2.1, 2.2
• New JS language service in Visual Studio
• Better and more refactoring support
• Extensions methods
• Mixin classes
• Better .jsx react native support
#devoxxfr #ngjava @sebastienpertus @agoncal
Nullable types
number
stringboolean
#devoxxfr #ngjava @sebastienpertus @agoncal
Non-nullable types
number
stringboolean
#devoxxfr #ngjava @sebastienpertus @agoncal
Non-nullable types
number
stringboolean
undefined null
#devoxxfr #ngjava @sebastienpertus @agoncal
Non-nullable typesstring
undefined null
string | null | undefined
#devoxxfr #ngjava @sebastienpertus @agoncal
Demo Time !
Non Nullables Types
Control Flow
Async / await
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Docker
• « Build, Ship, Run »
• Containers, containers, containers
• Docker to run containers
• Docker-compose to compose several containers
• WildFly containers
• JRE container
#devoxxfr #ngjava @sebastienpertus @agoncal
Dockerfile Skinny War
FROM jboss/wildfly:10.1.0.Final
EXPOSE 8080
# Setting the Wildfly Admin console (user/pwd admin/admin)
RUN $JBOSS_HOME/bin/add-user.sh admin admin --silent
CMD $JBOSS_HOME/bin/standalone.sh -b 0.0.0.0 -bmanagement 0.0.0.0
COPY venue.war $JBOSS_HOME/standalone/deployments/
#devoxxfr #ngjava @sebastienpertus @agoncal
Dockerfile Far Jar
FROM openjdk:8-jre-alpine
EXPOSE 8080
COPY venue-swarm.jar /opt/venue-swarm.jar
ENTRYPOINT ["java", "-jar", "/opt/venue-swarm.jar"]
#devoxxfr #ngjava @sebastienpertus @agoncal
Dockerfile Angular Distribution
FROM nginx
EXPOSE 80
COPY ./dist /usr/share/nginx/html
#devoxxfr #ngjava @sebastienpertus @agoncal
Demo Time !
Skinny War Image
Fat Jar Image
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Angular : In a nutshell
Modules
Components
Services
#devoxxfr #ngjava @sebastienpertus @agoncal
Angular Component
#devoxxfr #ngjava @sebastienpertus @agoncal
Angular Module
#devoxxfr #ngjava @sebastienpertus @agoncal
Angular Dependency Injection
#devoxxfr #ngjava @sebastienpertus @agoncal
Angular & Webpack
#devoxxfr #ngjava @sebastienpertus @agoncal
ES7 THEN ES8 PROPOSAL ALREADY IMPLEMENTED IN TS
Decorators
Pattern that allow us to extend /
modify the behavior of a class /
function / propery
As you can see ….
It’s used A LOT in Angular 2
#devoxxfr #ngjava @sebastienpertus @agoncal
Decorators
class Person {
public lastName: string;
public firstName: string;
constructor(ln: string, fn: string) {
this.lastName = ln;
this.firstName = fn;
}
@log(false)
public getFullName(fnFirst: boolean = true) {
if (fnFirst)
return this.firstName + " " + this.lastName;
else
return this.lastName + " " + this.firstName;
}
}
#devoxxfr #ngjava @sebastienpertus @agoncal
Decorators
function (target: any, propertyKey: string, descriptor: PropertyDescriptor) {
var desc = {value: function (...args: any[]) {
// get the paramsvar params = args.map(arg => JSON.stringify(arg)).join();
// get the resultvar result = descriptor.value.apply(this, args);var resultString = JSON.stringify(result);
console.log(`function ${propertyKey} invoked. Params: ${params}. Result: ${resultString}`);
return result;}
}return desc;
}
#devoxxfr #ngjava @sebastienpertus @agoncal
Angular CLI
Angular Command Line Interface
#devoxxfr #ngjava @sebastienpertus @agoncal
Demo Time !
Angular CLI
- Component
- Service
#devoxxfr #ngjava @sebastienpertus @agoncal
Agenda
• Enterprise Java MicroProfile
• TypeScript
• Docker
• Angular 2
• Break
• Exposing & consuming REST APIs with Angular 2
• Tips and tricks:
• APIs, Swagger, Cors, Hateoas, Etag, JWT, Scaling
Ask questions
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Exposing REST Endpoints
#devoxxfr #ngjava @sebastienpertus @agoncal
Conference Micro Services
#devoxxfr #ngjava @sebastienpertus @agoncal
Exposing « beautiful » APIs
• JSon:API
• OData
• Jsend
• HAL
• CPHL
• SIREN
• Google’s JSon Style Guide
• Do it your own
#devoxxfr #ngjava @sebastienpertus @agoncal
« Kind of » JSon:API
GET http://host/schedule/api/sessions
GET http://host/schedule/api/sessions?page=2
GET http://host/schedule/api/sessions?sort=title
GET http://host/schedule/api/sessions?sort=-title,date
POST http://host/schedule/api/sessions
GET http://host/schedule/api/sessions/abcd
REMOVE http://host/schedule/api/sessions/abcd
GET http://host/speaker/api/speakers/abcd
GET http://host/speaker/api/speakers/abcd?expand=false
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Swagger
• Simple yet powerful representation of your RESTful API
• API documentation
• What do you call?
• What are the parameters?
• What are the status code?
• Contract written in JSon (or Yaml)
• Donated to the Open API Initiative
#devoxxfr #ngjava @sebastienpertus @agoncal
Swagger’s ecosystem
#devoxxfr #ngjava @sebastienpertus @agoncal
Swagger APIs
@Path("/speakers")
@Api(description = "Speakers REST Endpoint")
public class SpeakerEndpoint {
@POST
@ApiOperation(value = "Adds a new speaker to the conference")
@ApiResponses(value = {
@ApiResponse(code = 400, message = "Invalid input")})
public Response add(@NotNull Speaker speaker) { ... }
@GET @Path("/{id}")
@ApiOperation(value = "Finds a speaker by ID")
public Response retrieve(@PathParam("id") String id) { ... }
}
#devoxxfr #ngjava @sebastienpertus @agoncal
Swagger Maven Plugin
<plugin>
<groupId>com.github.kongchen</groupId>
<artifactId>swagger-maven-plugin</artifactId>
<configuration>
<apiSources><apiSource>
<locations>org.agoncal.conference.venue.rest</locations>
<schemes>http,https</schemes>
<host>localhost:8080</host>
<basePath>/api</basePath>
<info>
<title>Room</title>
<version>1.0.0</version>
<description>Rooms of the venue</description>
</info>
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Swagger TypeScript for Angular generation
public add(room: models.Room): Observable<{}> {
return this.http.request(path, requestOptions).map((response: Response) => { … });
}
public retrieve(id: string, extraHttpRequestParams?: any): Observable<models.Room> {
return this.http.request(path, requestOptions).map((response: Response) => { … });
}
#devoxxfr #ngjava @sebastienpertus @agoncal
Demo Time !
Generate Angular from Swagger
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Proxy
#devoxxfr #ngjava @sebastienpertus @agoncal
CORS
• Cross-Origin Resource Sharing
• Specification (https://www.w3.org/TR/cors/)
• Access across domain-boundaries
• JavaScript and web programming has grown
• But the same-origin policy still remains
• Prevents JavaScript from making requests across domain
boundaries
#devoxxfr #ngjava @sebastienpertus @agoncal
HTTP Header
Access-Control-Allow-Origin
Access-Control-Allow-Credentials
Access-Control-Expose-Headers
Access-Control-Max-Age
Access-Control-Allow-Methods
Access-Control-Allow-Headers
Access-Control-Request-Method
Access-Control-Request-Headers
#devoxxfr #ngjava @sebastienpertus @agoncal
CORS@Provider
public class CORSFilter implements ContainerResponseFilter {
public void filter(ContainerRequestContext request,
ContainerResponseContext response) throws IOException {
response.getHeaders().add("Access-Control-Allow-Origin", "*");
response.getHeaders().add("Access-Control-Allow-Headers",
"origin, content-type, accept, authorization, Etag");
response.getHeaders().add("Access-Control-Allow-Credentials",
"true");
response.getHeaders().add("Access-Control-Allow-Methods",
"GET, POST, PUT, DELETE, OPTIONS, HEAD");
}
}
#devoxxfr #ngjava @sebastienpertus @agoncal
Demo Time !
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
HateOAS
• « Hypermedia as the engine of application state »
• At its core is the concept of « hypermedia »
• Or in other words: the idea of links
• Client application goes from one state to the next by following a link
• Runtime contract
• Nothing in Java EE, maybe in MicroProfile
• JAX-RS has a Link API
#devoxxfr #ngjava @sebastienpertus @agoncal
Links
links: {
self: "http://host/schedule/api/sessions?page=1",
first: "http://host/schedule/api/sessions?page=1",
last: "http://host/schedule/api/sessions?page=14",
next: "http://host/schedule/api/sessions?page=2",
monday: "http://host/schedule/api/sessions/monday",
tuesday: "http://host/schedule/api/sessions/tuesday"
},
data: [ {
links: {
self: "http://host/schedule/api/sessions/uni_room9_tuesd"
},
id: "uni_room9_tuesday_8_9h30_12h30",
title: ”Java EE and Angular 2",
#devoxxfr #ngjava @sebastienpertus @agoncal
http://www.iana.org/assignments/link-relations/link-relations.xml
#devoxxfr #ngjava @sebastienpertus @agoncal
Links
@XmlType(name = "links")
public abstract class LinkableResource implements Identifiable {
private Map<String, URI> links;
public void addSelfLink(URI uri) {
addLink(SELF, uri);
}
public void addCollectionLink(URI uri) {
addLink(COLLECTION, uri);
}
}
#devoxxfr #ngjava @sebastienpertus @agoncal
Links
if (body.links) {this.links = {};for (let key in body.links) {
this.links[key] = body.links[key] !== undefined ? body.links[key] : null;}
}
#devoxxfr #ngjava @sebastienpertus @agoncal
Demo Time !
HateOAS
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Caching
• HTTP has temporary storage (caching)
• Reduce bandwidth usage
• Reduce server load
• Reduce perceived lag
• ETags, or entity-tags: "conditional" requests.
• Checksum
• If-None-Match
#devoxxfr #ngjava @sebastienpertus @agoncal
Etag Generation
@GET @Path("/{id}")
public Response retrieve(@PathParam("id") String id,
@Context Request request) {
Talk talk = talkRepository.findById(id);
EntityTag etag = new EntityTag(talk.hashCode());
Response.ResponseBuilder preconditions =
request.evaluatePreconditions(etag);
if (preconditions == null) {
preconditions = Response.ok(talk).tag(etag);
}
return preconditions.build();
}
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Demo Time !
ETag & caching
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
JSon Web Token
• Lightweigh token
• Contains « some » data (claims)
• Base64
• Encrypted
• Passed in the HTTP Header
• Sent at each request
• Not in Java EE nor Microprofile (yet)
• Many librairies
#devoxxfr #ngjava @sebastienpertus @agoncal
A Token
Bearer
eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJhZ29uY2FsIiwiaXNzIjoi
aHR0cDovL2NvbmZlcmVuY2UuZG9ja2VyLmxvY2FsaG9zd
Do5MC9jb25mZXJlbmNlLWF0dGVuZGVlL2FwaS9hdHRlbm
RlZXMvbG9naW4iLCJpYXQiOjE0Nzc0OTk3NTUsImV4cCI6
MTQ3NzUwMDY1NX0.aL0a_q5wC3cesBKhkXChg30zr3W
WOsYhFhpJ0lQ479LtLjrPvTQiDH0N_YnFuARuEuy299S4u
O0yXGmX0tSs-Q
#devoxxfr #ngjava @sebastienpertus @agoncal
A Token
Bearer
eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJhZ29uY2FsIiwiaXNzIjoi
aHR0cDovL2NvbmZlcmVuY2UuZG9ja2VyLmxvY2FsaG9zd
Do5MC9jb25mZXJlbmNlLWF0dGVuZGVlL2FwaS9hdHRlbm
RlZXMvbG9naW4iLCJpYXQiOjE0Nzc0OTk3NTUsImV4cCI6
MTQ3NzUwMDY1NX0.aL0a_q5wC3cesBKhkXChg30zr3W
WOsYhFhpJ0lQ479LtLjrPvTQiDH0N_YnFuARuEuy299S4u
O0yXGmX0tSs-Q
#devoxxfr #ngjava @sebastienpertus @agoncal
A Token
HEADER: { "alg": "HS512" }
PAYLOAD:{
"sub": "agoncal",
"iss": "http://host/attendee/api/login",
"iat": 1477499755,
"exp": 1477500655
}
VERIFY SIGNATURE HMACSHA256(...)
#devoxxfr #ngjava @sebastienpertus @agoncal
JWT Generation
@Path("/attendees")
public class AttendeeEndpoint {
@POST @Path("/login")
@Consumes(APPLICATION_FORM_URLENCODED)
public Response auth(@FormParam("login") String login,
@FormParam("password") String password) {
// Authentication, security exception and so on...
return Response.ok().header(AUTHORIZATION, "Bearer " +
issueToken(login)).build();
}
}
#devoxxfr #ngjava @sebastienpertus @agoncal
Filter to Check the Token@JWTTokenNeeded
@Provider @Priority(Priorities.AUTHENTICATION)
public class JWTTokenNeededFilter implements ContainerRequestFilter{
public void filter(ContainerRequestContext ctx) {
String auth = ctx.getHeaderString(HttpHeaders.AUTHORIZATION);
if (auth == null || !authorizationHeader.startsWith("Bearer")) {
throw new NotAuthorizedException("No Bearer");
}
String token = auth.substring("Bearer".length()).trim();
Jwts.parser().setSigningKey(key).parseClaimsJws(token);
}
}
#devoxxfr #ngjava @sebastienpertus @agoncal
Check the Token@Path("/ratings")
public class RatingEndpoint {
@JWTTokenNeeded
@POST
public Response rate(...) {
}
@GET
public Response retrieve(...) {
}
}
#devoxxfr #ngjava @sebastienpertus @agoncal
JWT Consumptionreturn this.http
.post(this.basePath, body, requestOptions)
.map((response: Response) => {if (response.status !== 200) {
return undefined;}this.jwt = response.headers.get('authorization');
if (!this.jwt)return undefined;
return this.jwt;
}).catch((error: any) => {
return undefined});
#devoxxfr #ngjava @sebastienpertus @agoncal
@Injectable()export class AuthGuardService implements CanActivate {
constructor(private authService: AuthService, private router: Router) { }
canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean{
let url: string = state.url;
return this.checkLogin(url);}
checkLogin(url: string): boolean {if (this.authService.isLoggedIn) {
return true;}
this.router.navigate(['/login'], { queryParams: { redirectTo: url } });return false;
}}
#devoxxfr #ngjava @sebastienpertus @agoncal
Demo Time !
Passing a token around
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Scaling
• Stateless architecture
• No cookie
• No HTTP session
• No local cache
• Stateless scales better than statefull
• Clients can round robin
• Dynamic proxy
• Meet Traeffik
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Proxy
#devoxxfr #ngjava @sebastienpertus @agoncal
Demo Time !
Traeffik
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Going in production with Angular
• By default, Angular (in dev mode) is about … 4 mb !
• Angular cli and webpack will:
• Uglify your JavaScript code
• Create a standalone bundle file
• Gzip compress
• Apply a tree shaking to delete unused code (it’s not dead code, btw !)
• Could use AOT compilation
#devoxxfr #ngjava @sebastienpertus @agoncal
JIT vs AOT Compilation
Source Code
JIT Compilation
Code Generation
VM execution
Source Code
AOT Compilation
Code Generation
VM execution
BUILD
RUN
#devoxxfr #ngjava @sebastienpertus @agoncal
With AOT, AN Angular project could be 60 – 70 % less code
http://slides.com/wassimchegham/demystifying-ahead-of-time-compilation-in-angular-2-aot-jit#/32
#devoxxfr #ngjava @sebastienpertus @agoncal
Demo Time !
Angular Production ready
#devoxxfr #ngjava @sebastienpertus @agoncal
Conclusion
• MicroProfile 1.1 will bring more MicroServices features
• Configuration
• Security: JWT Token Exchange
• Health Check
• Fault Tolerance
• More to come
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Conclusion
• Angular 4
• Native Script
• TypeScript 2.x
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
#devoxxfr #ngjava @sebastienpertus @agoncal
Enterprise Java MicroProfile
TypeScript and Angular
Sebastien Pertus
Antonio Goncalves
https://github.com/agoncal/agoncal-application-conference