Service-oriented webapp construction using a web metaframework

Licensed under Creative Commons Attribution-Share Alike 3.0

© 2013-2014 Juan M. Dodero

seminar

service-oriented webapp construction

using a metaframework

Juan Manuel Dodero [email protected]



agenda issue webapp construction

context web of data service-oriented web frameworks

techniques ReST services JSON data

tooling spring ROO framework

practice



issue



modern webapp construction



goal

[easily] implement service-oriented web apps



context


service-oriented



webofdata



web app architecture


architectural abstraction MVC pattern data access tier abstraction ORM pattern


constructing with web frameworks


spring framework

client code

abstraction e.g. MVC pattern inversion of control e.g. Spring DI & AOP


constructing with frameworks


framework

control flow

client code

class MyObject extends Object { myMethod() {...} }

o.myMethod();

abstraction design patterns inversion of control dependency injection



framework trends



techniques


example

Requirements

PizzaShop must build and deploy a set of web services to enable clients:

!  get a list of pizzas

!  get info on a specific pizza

!  submit a pizza purchase order

!  etc



Request [XML doc]

Response [XML doc]

web

ser

ver

SOAP envelope

HTTP POST aURL

HTTP Response

getPizzaList()

Request [XML doc]

Response [XML doc]

HTTP POST aURL

HTTP Response

getPizza(id) SOAP server

Request [XML doc]

HTTP POST aURL

submit(PizzaOrder) Response [XML doc]

HTTP Response

SOAP implementation



web

ser

ver

HTTP GET request /pizzas

HTTP response

Response (HTML/XML/JSON doc)

HTTP GET request

HTTP response

HTTP POST /pizzaorder/id

HTTP response URL to submitted Order

Request (HTML/XML/JSON)

Pizza List

Pizza

Pizza Order

ReST implementation


/pizza/id

Response (HTML/XML/JSON doc)


ReST design



JSON data serialization


$ curl -s -H "Accept: application/json" http://localhost:8080/pizzashop/pizzas | jq . [ { "version": 1, "toppings": [ { "version": 1, "name": "Mozzarella", "id": 9 }, { "version": 1, "name": "Anchovy fillets", "id": 10 } ], "price": 7.5, "name": "Napolitana", "id": 8, "base": { "version": 1, "name": "Thin Crust", "id": 1 } } ]



tooling



“fundamentally improve Java developer productivity without compromising engineering integrity or flexibility"!


spring ROO features

! 100% java: based on other solid, well-known frameworks

(spring, hibernate, apache tiles, aspectj, flexJSON, dojoToolkit, etc.)

! convention over configuration

! meta-framework (generates source code)

! generated/manual code keep in sync

! works in build-time (not run-time)

! command console

! extensible by add-ons



roo architecture



ReST URI pattern



demo roo console



demo web app



demo domain model



demo roo script // Create a new project project --topLevelPackage com.springsource.pizzashop // Setup JPA persistence using EclipseLink and H2 jpa setup --provider ECLIPSELINK --database H2_IN_MEMORY // Create domain entities entity jpa --class ~.domain.Base --activeRecord false --testAutomatically field string --fieldName name --sizeMin 2 –notNull entity jpa --class ~.domain.Topping --activeRecord false --testAutomatically field string --fieldName name --sizeMin 2 –notNull entity jpa --class ~.domain.Pizza --activeRecord false --testAutomatically field string --fieldName name --notNull --sizeMin 2 field number --fieldName price --type java.math.BigDecimal field set --fieldName toppings --type ~.domain.Topping field reference --fieldName base --type ~.domain.Base entity jpa --class ~.domain.PizzaOrder --testAutomatically --activeRecord false --identifierType ~.domain.PizzaOrderPk field string --fieldName name --notNull --sizeMin 2 field string --fieldName address --sizeMax 30 field number --fieldName total --type java.math.BigDecimal field date --fieldName deliveryDate --type java.util.Date field set --fieldName pizzas --type ~.domain.Pizza field string --fieldName shopCountry --class ~.domain.PizzaOrderPk field string --fieldName shopCity field string --fieldName shopName

// Define a repository layer for persistence repository jpa --interface ~.repository.ToppingRepository --entity ~.domain.Topping repository jpa --interface ~.repository.BaseRepository --entity ~.domain.Base repository jpa --interface ~.repository.PizzaRepository --entity ~.domain.Pizza repository jpa --interface ~.repository.PizzaOrderRepository --entity ~.domain.PizzaOrder

// Define a service/façade layer service type --interface ~.service.ToppingService --entity ~.domain.Topping service type --interface ~.service.BaseService --entity ~.domain.Base service type --interface ~.service.PizzaService --entity ~.domain.Pizza service type --interface ~.service.PizzaOrderService --entity ~.domain.PizzaOrder

// Offer JSON remoting for all domain types through Spring MVC json all --deepSerialize web mvc json setup web mvc json all --package ~.web web mvc setup web mvc all --package ~.web



demo json data


$ curl -s -H "Accept: application/json" http://localhost:8080/pizzashop/pizzas | jq . [ { "version": 1, "toppings": [ { "version": 1, "name": "Mozzarella", "id": 9 }, { "version": 1, "name": "Anchovy fillets", "id": 10 } ], "price": 7.5, "name": "Napolitana", "id": 8, "base": { "version": 1, "name": "Thin Crust", "id": 1 } } ]


~.dom

ain.Pizza


@RooJavaBean @RooToString @RooJpaEntity @RooJson(deepSerialize = true) public class Pizza {

@NotNull @Size(min = 2) private String name;

private BigDecimal price;

@ManyToMany(cascade = CascadeType.ALL) private Set<Topping> toppings = new HashSet<Topping>();

@ManyToOne private Base base; }


Pizza_Roo_JavaBean.aj


privileged aspect Pizza_Roo_JavaBean {

public String Pizza.getName() { return this.name; }

public void Pizza.setName(String name) { this.name = name; }

...

public Set<Topping> Pizza.getToppings() { return this.toppings; }

public void Pizza.setToppings(Set<Topping> toppings) { this.toppings = toppings; }

public Base Pizza.getBase() { return this.base; }

public void Pizza.setBase(Base base) { this.base = base; }

}


Pizza_Roo_Json.aj


privileged aspect Pizza_Roo_Json {

...

public String Pizza.toJson(String[] fields) { return new JSONSerializer() .include(fields).exclude("*.class").deepSerialize(this); }

public static Pizza Pizza.fromJsonToPizza(String json) { return new JSONDeserializer<Pizza>() .use(null, Pizza.class).deserialize(json); }

public static String Pizza.toJsonArray(Collection<Pizza> collection) { return new JSONSerializer() .exclude("*.class").deepSerialize(collection); }

...

public static Collection<Pizza> Pizza.fromJsonArrayToPizzas(String json) { return new JSONDeserializer<List<Pizza>>() .use("values", Pizza.class).deserialize(json); }

}



http://dodero.github.io/sosc-wmf/

practice


references




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