Arquitetura: chega de mesmice

Arquitetura: chega de mesmiceGuilherme Silveira

Tuesday, October 12, 2010

Guilherme Silveiraguilherme.silveira@caelum.com.br

são paulo

Guilherme Silveiraguilherme.silveira@caelum.com.br

2002 guj.com.br2003 vraptor2004 caelum.com.br xp, xstream2006 scrum2009 restfulie, lean2010 tectura.com.br

calendar.com

travel.com company.com

bank.com

CORBAheaven?

EJBheaven?

SOAPheaven?

what is REST?

what is the future of integration over the web?

what was REST?

Restful

Services

Restful

Servicescreate a saas account

Restful

freeze account

Restful

freeze account

reactivate account

Restful Services

port 80

Restful Services

port 80

firewall heaven

Restful

ServicesWeb

Restful

Services

xml, json

Restful

Services

xml, json

get, post, ...

Restful ServicesWeb

But what about Hypermidia?What about consumers?

as of 2009

Restful ServicesWeb

There is much more!

But what about Hypermidia?What about consumers?

as of 2009

unresttrips.com: flight details

<?xml version="1.0" encoding="UTF-8" standalum="yes"?><flight> <information> <from>sao paulo</from> <to>seoul</to> </information> <value>900.00</value></flight>

service locator when integrating:

coupling++

guilherme

unresttrips.com

unrest pay

service locator when integrating:

coupling++

guilherme

unresttrips.com

unrest pay

resttrips.com: flight details

<?xml version="1.0" encoding="UTF-8" standalum="yes"?><flight> <information> <from>sao paulo</from> <to>seoul</to> </information> <value>900.00</value> <link rel="payment" href="http://resttrips.com/payment/custom"/></flight>

resttrips.com: flight details

<?xml version="1.0" encoding="UTF-8" standalum="yes"?><flight> <information> <from>sao paulo</from> <to>seoul</to> </information> <value>900.00</value> <link rel="payment" href="http://resttrips.com/payment/custom"/></flight>

resttrips.com: making the payment

flight = Client.at('http://resttrips.com/f/574XR4').get();

confirmation = flight.getLink("payment"). patch(cardInformation, value);

resttrips.com: making the payment

confirmation = flight.getLink("payment"). patch(cardInformation, value);

resttrips.com: changing its payment provider

<?xml version="1.0" encoding="UTF-8" standalum="yes"?><flight> <information> <from>sao paulo</from> <to>seoul</to> </information> <value>900.00</value> <link rel="payment" href="http://paysite.com/custom"/></flight>

resttrips.com: changing its payment provider

<?xml version="1.0" encoding="UTF-8" standalum="yes"?><flight> <information> <from>sao paulo</from> <to>seoul</to> </information> <value>900.00</value> <link rel="payment" href="http://paysite.com/custom"/></flight>

dependency injection when integrating:

coupling--

guilherme

resttrips.com

paysite.com

restrips pay

dependency injection when integrating:

coupling--

guilherme

resttrips.com

paysite.com

restrips pay

trip = resource

payment = resource

http://kayak.com/f/574XR4

any_uri_unknown_at_compile_time

não viajo sozinho

meu amigo @sergio_caelum

Bilu biluTuesday, October 12, 2010

confirmation = flight.getLink("payment"). patch(cardInformation, value/2);

// send the payment link to another part of the web

resttrips.com: sharing a trip

myself = Client.at('http://users.calendar.com') .with(auth).get();

myself.link("calendar").patch(flight.link("self"));

calendar: integrating my systems

myself = Client.at('http://users.calendar.com') .with(auth).get();

myself.link("calendar").patch(flight.link("self"));

calendar: integrating my systems

me.link("calendar").patch(link_to_birthday_list)me.link("calendar").patch(link_to_hotel_reservation)me.link("calendar").patch(link_to_trip_details)

calendar: more examples

so what?

Any update on the flight ==> reflects hereAny update on the hotel ==> reflects hereAny update on the meeting ==> reflects here

so what?

Any update on the flight ==> reflects hereAny update on the hotel ==> reflects hereAny update on the meeting ==> reflects here

don’t just u

se, integrate!

so what? that was just keeping an URI.

Remove ==> Cancels the flightRemove ==> Cancels the reservationRemove ==> Emails your coworkers

do not central

ize control!

integration over the web

INTEGRATION is DECENTRALIZING the CONTROLdelegating to multiple agents

distributed systems

does our ‘rest’ sites in 2010 work

this way?

but which format?

mas qual o formato dopagamento ou calendário?

#json, #xml, #soap #etc?

qual #json, #xml #etc?

exercise

who is that guy?

quem é essa?

fácil? e ela?

não é minha filha!

conteúdo sem semânticanão tem valor!

so what?

micro formats, media types, rdf etc

so what?

micro formats, media types, rdf etc

micro formats

with hyperlinks!

integration over the web

#json, @sergio_caelum

de onde veio o # e o @?

“watching @guilhermecaelum #qconsp *10 great talk”

Atenção: esse tweet é só uma sugestão!

controlled vocabulary

emergiu no twitter, por exemplo

inventar antes o controlled vocabulary?

top down? Big Design Up Front

O monstro do lago SOAP, longa de 2001

economizando

# busca um voodef voos_de(site) base = Restfulie.at(site).get voos = base.link("opensearch").get.fill("flight").with(:from => "GRU", :to => "JFK").getend

voos = voos_de("kayak")voos << voos_de("tam")voos << voos_de("gol")voos << voos_de("cvc")

voo_mais_barato(voos).link("payment").post(inferno_do_cartao)

voo = voo_mais_barato(voos)

banco = Restfulie.at("meubanco").auth(eu).get

auth = banco.cartoes["lisa"] .authorization(1.min, voo.preco)voo.link("payment").post(auth)

mais_barato(voos).link("payment")...

guilherme super viagem

caelum

Put your server to RESTleonard richardsons model

Server Maturity1 uri, 1 http verb

/services.do?action=install&...

Server Maturity1 uri, 1 http verb

@Path("/services")public class Services {

@GET public Response services( @QueryParam("action") String action) {

ServiceFactory factory = new ServiceFactory(); Service service = factory.getServiceFor(action); return service.execute(); }

}Tuesday, October 12, 2010

Server Maturity

public class InstallService {

public Response execute() { return Response.ok() .type("application/xml") .entity("<service>...</service>") .build(); }

1 uri, 1 http verb

I know them all beforehand.

1 uri, 1 http verb

Any change will break all our clients!

a priori knowledge

a priori knowledge=

coupling++

Server MaturityMultiple uris, 1 http verb

/install?...

Server MaturityMultiple uris, 1 http verb

/install?...

@GET @Path("install") public Response install() { return new InstallService().execute(); }

@GET @Path("uninstall") public Response uninstall() { return new UninstallService().execute(); }

but...

GET should not imply in undesireable effects

GET hell

GET could help us with cache!

POST hell

Server MaturityMultiple uris, multiple verbs

POST /cloudGET /cloud/1547437/softwarePOST /cloud/1547437/software

rails + restfulierubyonrails.org

rails + restfulieclass SoftwaresController < ApplicationController acts_as_restfulie respond_to :xml, :json def create @item = Item.create(params[:item]) respond_with @item, :status => :created end def show @item = Item.find(params[:id]) respond_with @item endend

rubyonrails.org

Vraptorvraptor.org/en

Vraptor

@Resourcepublic class SoftwareResource {

public void install() { Software software = SoftwareRepository.register (software); response.created(software); }

public void uninstall() { response.deleted(software); }

vraptor.org/en

JAX-RS

@Path("/softwares")public class SoftwareResource {

@POST @Consumes("application/xml") public Response install(Software software) { software = SoftwareRepository.register(software); long id = software.getId(); URI uri = UriBuilder.fromPath("/softwares/" + id) .build(); software.install(); return Response.created(uri).build(); }

JAX-RS

@DELETE @Path("{id}") public Response uninstall(@PathParam("id") Long id) { Software software = SoftwareRepository.retrieve(id); software.uninstall(); return Response.ok().build(); }

Uniform Interface++Resources++

Http verbs examplePOST creates

PUT replaces

PATCH updates

DELETE removes

GET retrieves

OPTIONS tells me what i can do

Is a Restful servicea cute CRUD?

but there is more!

enter amazon.com

hypermedia

enter amazon.com

search (GET)

hypermedia

enter amazon.com

search (GET)

create a payment (POST)

hypermedia

enter amazon.com

search (GET)

hypermedia

enter amazon.com

search (GET)

create a basket (POST)

hypermedia

enter amazon.com

search (GET)

follow links

hypermedia

enter amazon.com

search (GET)

follow links

fill forms

hypermedia

Cloud API

GET /user/15 retrieves an user

Cloud API

follow GET machines accesses its machines

Cloud API

follow POST self installs a new machine

Cloud API

follow POST self installs a new machine

follow POST payment pay for it

$ curl http://localhost:9998/user/574 -iHTTP/1.1 200 OK...

retrieves an user

<?xml version="1.0" encoding="UTF-8" standalone="yes"?><user> <link rel="machines" href="/user/574/machines"/> <name>guilherme silveira</name> <website>www.caelum.com.br</site> <link rel="payment" href="/payment/custom"/> ...</user>

$ curl http://localhost:9998/user/574/machines -iHTTP/1.1 200 OKContent-Type: application/xml

maschine maschine maschine

maschine<?xml version="1.0" encoding="UTF-8" standalone="yes"?><machines xmlns:ns2="http://www.w3.org/2005/Atom"> <machine> <ns2:link rel="self" href="/user/574/machines/1"/> <ns2:link rel="software" href="/machines1/softwares"/> <id>1</id> <host>www.caelum.com.br</host> <softwares> <software> <id>1234</id> <ns2:link rel="self" href="/softwares/1234"/> </software> </softwares> </machine></machines>

payment

#buthow?

Machine.java

@XmlRootElement@XmlType(propOrder= {"id", "host", "softwares", "links"})public class Machine { private final all variables here;

@XmlElement(name="link", namespace="http://www.w3.org/2005/Atom") public List<Link> getLinks() { return Arrays.asList( Link.to("/machines/" + getId(), "self"), Link.to("/machines/" + getId() + "/softwares", "softwares") ); }

@XmlElementWrapper(name="softwares") @XmlElement(name="software") public List<Software> getSoftwares() { return softwares; }

public void install(Software software) { getSoftwares().add(software); }

public void uninstall(Software software) { getSoftwares().remove(software); }

Machine.java

@XmlRootElement@XmlType(propOrder= {"id", "host", "softwares", "links"})public class Machine { private final all variables here;

@XmlElement(name="link", namespace="http://www.w3.org/2005/Atom") public List<Link> getLinks() { return Arrays.asList( Link.to("/machines/" + getId(), "self"), Link.to("/machines/" + getId() + "/softwares", "softwares") ); }

@XmlElementWrapper(name="softwares") @XmlElement(name="software") public List<Software> getSoftwares() { return softwares; }

public void install(Software software) { getSoftwares().add(software); }

public void uninstall(Software software) { getSoftwares().remove(software); }

@Path("/machines")public class MachineResource {

@Path("{id}/softwares") public SoftwareResource softwares(@PathParam("id") Long id) { Machine machine = new MachineRepository().retrieve(id); if (machine != null) { SoftwareResource softwareResource = new SoftwareResource(); softwareResource.setMachine(machine); return softwareResource; } throw new WebApplicationException(404); }

@POST @Consumes("application/xml") public Response create(Machine machine) { Long id = new MachineRepository().save(machine); return Response.created(UriBuilder.fromPath("/" + id).build()).build(); }

@GET @Path("{id}") @Produces("application/xml") public Machine show(@PathParam("id") Long id) { return new MachineRepository().retrieve(id); }

@GET @Produces("application/xml") public Machines list() { Machines machines = new Machines(); machines.setMachine(new MachineRepository().list()); return machines; }}

MachineResource

@Path("{id}/softwares") public SoftwareResource softwares(@PathParam("id") Long id) { Machine machine = new MachineRepository().retrieve(id); if (machine != null) { SoftwareResource softwareResource = new SoftwareResource(); softwareResource.setMachine(machine); return softwareResource; } throw new WebApplicationException(404); }

@POST @Consumes("application/xml") public Response create(Machine machine) { Long id = new MachineRepository().save(machine); return Response.created(UriBuilder.fromPath("/" + id).build()).build(); }

@GET @Path("{id}") @Produces("application/xml") public Machine show(@PathParam("id") Long id) { return new MachineRepository().retrieve(id); }

@GET @Produces("application/xml") public Machines list() { Machines machines = new Machines(); machines.setMachine(new MachineRepository().list()); return machines; }}

MachineResource

Server Modelaccording toLeonard Richardson, 2008

one uri + one verb

multipleuris

one uri + one verb

multipleuris

one uri + one verb

Less ugly

multipleverbs

multipleuris

one uri + one verb

multipleverbs

multipleuris

one uri + one verb

cute CRUD

multipleverbs

multipleuris

hypermedia

one uri + one verb

JAX-RS wishlist

VRaptor and Restfulie

examplesvraptor.org/en

1. conventions?

@GET public Response services( @QueryParam("action") String action) {

ServiceFactory factory = new ServiceFactory(); Service service = factory.getServiceFor(action); return service.execute(); }

Convention over Configuration

@Resourcepublic class Services { private final ServiceFactory factory; public Services(ServiceFactory factory) { this.factory = factory; }

public void services(String action) { factory.getServiceFor(action).execute(); }

do you want to avoid copy+paste?

2. TDD: hard to test@Path("/products")public class Products {

@GET public Response create( @QueryParam("what") String what) {

// persists return Response.ok() .type("application/xml") .entity("<product>...</product>") .build(); }

coupled to the implementation

TDD: mock it

@Resourcepublic class Services { private final Response response; public Services(Response response) { this.response = response; }

public void services(String action) { response.getServiceFor(action).execute(); }

coupled to the interfacecouple--

TDD: mock it

@Resourcepublic class Services { private final Response response; public Services(Response response) { this.response = response; }

public void services(String action) { response.getServiceFor(action).execute(); }

coupled to the interfacecouple--

3. Content negotiation by hand

Let us do it for you.

@Post @Consumes public void install(Software software) { software = SoftwareRepository.register(software); response.created(software); }

Let us do it for you.

@Post @Consumes public void install(Software software) { software = SoftwareRepository.register(software); response.created(software); }

4. URI coupling

@GET @Path("/softwares/{id}") public Response install(@QueryParam("id") Software software) { // ... }

writing the URI once

4. URI coupling

writing the URI again several times

4. URI coupling

ZERO uri replication

@Post @Consumes public void install(Software software) { // ... response.use(SoftwareResource.class).show(software); }

ZERO uri replication

@Post @Consumes public void install(Software software) { // ... response.use(SoftwareResource.class).show(software); }

@Path("{id}/softwares") public SoftwareResource softwares(@PathParam("id") Long id) { Machine machine = new MachineRepository().retrieve(id); if (machine == null) { throw new WebApplicationException(404); } // ... }

5. Parameter list

Yes, we can do it.

@Resourcepublic class MachineResource {

@Post ("{m.id}/softwares") public SoftwareResource softwares(Machine m) { Machine machine = new MachineRepository().retrieve(m); // ... }

parameter converter chain of responsabilityTuesday, October 12, 2010

Yes, we can do it.

@Resourcepublic class MachineResource {

@Post ("{m.id}/softwares") public SoftwareResource softwares(Machine m) { Machine machine = new MachineRepository().retrieve(m); // ... }

parameter converter chain of responsabilityTuesday, October 12, 2010

examplerestfulie.caelumobjects.com

Response response = client.at ("http://localhost:9998/user/574").get();

6. Client internal DSLs

Response response = client.at ("http://localhost:9998/user/574").get();

User user = response.getResource();System.out.println("user: " + user.getName());

6. Client internal DSLs

User user = response.getResource();System.out.println("user: " + user.getName());

Link link = resource(user).getLink("machine");response = link.follow().post(new Machine());

double amount = resource(user).refresh(). getAmountDue();

link = resource(user).getLink("payment");Payment payment = new Payment(amount);response = link.follow().post(payment);

System.out.println("payment completed");

i was looking for a DSL and i did not know it!

bottom up

microformato

mime type?

design by committe

controlled vocabulary

hypermídiaviabilizando a integração através da web

obrigado

code samples

Lucas Cavalcanti(java server)@lucascs

Anderson Leite (ruby)@anderson_leite

Further reading

Roy Fielding dissertation

Further reading

Rest in Practice, Jim Webber and others

Further reading

Restful Webservices Cookbook, Subbu Allamaraju

Further reading

Restful Web Services, Richardson and Ruby

Further reading

JAX-RS specification

Further reading

Infoq articles on REST

Further reading

Infoq articles on REST

Restfulie guide

Further reading

Interviews and Presentations

Stefan Tilkov interview on InfoQ

http://bit.ly/9RUXKL

Leonard Richardson’s presentation at QCon

http://bit.ly/dj2W66

Martin Fowler on REST

http://bit.ly/bx61ci

Ian Robinson and Jim Webber interview

http://bit.ly/aEuzj3

Jan Algermissen classification

http://bit.ly/cycFBF

Guilherme Silveira on REST clients

http://bit.ly/aHCglv

code samples

JAX-RS

code samples

JAX-RS

http://jcp.org/en/jsr/detail?id=311

code samples

JAX-RS

code samples

JAX-RS

http://rubyonrails.org

code samples

JAX-RS

Restfulie

code samples

JAX-RS

Restfulie

http://restfulie.caelumobjects.com

code samples

JAX-RS

Restfulie

VRaptor

code samples

JAX-RS

Restfulie

VRaptor

http://vraptor.org/en

code samples

Arquitetura: chega de mesmice

Technology

Transcript of Arquitetura: chega de mesmice

Material design mesmice ou inovação

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