:index-group: REST
:jbake-type: page
:jbake-status: status=published

= REST Simples

Definir um serviço REST é fácil, simplesmente adicione a anotação ``@Path`` na classe, então defina o método HTTP (``@GET``, ``@POST``, ...) ao método da classe que deseja usar.

= O código

== O Serviço REST: ``@Path``, ``@GET``, ``@POST``

Aqui nós temos um REST simples, anotamos a classe com ``@Path("/greeting")`` para indicar a rota correspondente a classe ``GreetingService``. Definimos ``message()`` como ``@GET`` e ``lowerCase()`` como ``@POST`` para esta rota ``/greeting``. Pronto, temos um serviço! Simples não?

[source,java]
----
package org.superbiz.rest;

import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;

@Path("/greeting")
public class GreetingService {
    @GET
    public String message() {
        return "Hi REST!";
    }

    @POST
    public String lowerCase(final String message) {
        return "Hi REST!".toLowerCase();
    }
}
----

== Testando

=== Teste para o serviço JAXRS

Usamos o OpenEJB ``ApplicationComposer`` para facilitar o teste.

A ideia é primeiro ativar os serviços ``jaxrs``. Isto é feito usando a anotação ``@EnableServices``.

Então nós criamos a aplicação simplesmente retornando um objeto representando o ``web.xml``. Aqui nós simplesmente o usamos para definir o contexto raiz mas você também pode usar para definir sua aplicação REST também. E para completar a aplicação nós adicionamos a anotação ``@Classes`` para definir o conjunto de classes a ser utilizado nesse app.

Finalmente para testar nós usamos o client API do ``cfx`` para chamar o serviço REST nos métodos ``get()`` e ``post()``.

[source,java]
----
package org.superbiz.rest;

import org.apache.cxf.jaxrs.client.WebClient;
import org.apache.openejb.jee.SingletonBean;
import org.apache.openejb.junit.ApplicationComposer;
import org.apache.openejb.testing.EnableServices;
import org.apache.openejb.testing.Module;
import org.junit.Test;
import org.junit.runner.RunWith;

import java.io.IOException;

import static org.junit.Assert.assertEquals;

@EnableServices(value = "jaxrs")
@RunWith(ApplicationComposer.class)
public class GreetingServiceTest {
    @Module
    public SingletonBean app() {
        return (SingletonBean) new SingletonBean(GreetingService.class).localBean();
    }

    @Test
    public void get() throws IOException {
        final String message = WebClient.create("http://localhost:4204").path("/GreetingServiceTest/greeting/").get(String.class);
        assertEquals("Hi REST!", message);
    }

    @Test
    public void post() throws IOException {
        final String message = WebClient.create("http://localhost:4204").path("/GreetingServiceTest/greeting/").post("Hi REST!", String.class);
        assertEquals("hi rest!", message);
    }
}
----

= Running

Executar o exemplo é bastante simples. No diretório ``simple-rest`` dê o seguinte comando:
[source,java]
----
$ mvn clean install
----
Com isso, provavelmente você terá a seguinte saida.
[source,java]
----
INFO - Cannot find the configuration file [conf/openejb.xml].  Will attempt to create one for the beans deployed.
INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service)
INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager)
INFO - Creating TransactionManager(id=Default Transaction Manager)
INFO - Creating SecurityService(id=Default Security Service)
INFO - Initializing network services
INFO - Creating ServerService(id=httpejbd)
INFO - Creating ServerService(id=cxf-rs)
INFO - Initializing network services
INFO - Starting service httpejbd
INFO - Started service httpejbd
INFO - Starting service cxf-rs
INFO - Started service cxf-rs
INFO -   ** Bound Services **
INFO -   NAME                 IP              PORT
INFO -   httpejbd             127.0.0.1       4204
INFO - -------
INFO - Ready!
INFO - Configuring enterprise application: /opt/dev/openejb/openejb-trunk/examples/GreetingServiceTest
INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
INFO - Auto-creating a container for bean org.superbiz.rest.GreetingServiceTest: Container(type=MANAGED, id=Default Managed Container)
INFO - Creating Container(id=Default Managed Container)
INFO - Using directory /tmp for stateful session passivation
INFO - Enterprise application "/opt/dev/openejb/openejb-trunk/examples/GreetingServiceTest" loaded.
INFO - Assembling app: /opt/dev/openejb/openejb-trunk/examples/GreetingServiceTest
INFO - Existing thread singleton service in SystemInstance() null
INFO - Created new singletonService org.apache.openejb.cdi.ThreadSingletonServiceImpl@12c9b196
INFO - Succeeded in installing singleton service
INFO - OpenWebBeans Container is starting...
INFO - Adding OpenWebBeansPlugin : [CdiPlugin]
INFO - All injection points are validated successfully.
INFO - OpenWebBeans Container has started, it took 11 ms.
INFO - Deployed Application(path=/opt/dev/openejb/openejb-trunk/examples/GreetingServiceTest)
INFO - Setting the server's publish address to be http://127.0.0.1:4204/test
INFO - REST Service: http://127.0.0.1:4204/test/greeting/.*  -> Pojo org.superbiz.rest.GreetingService
INFO - Undeploying app: /opt/dev/openejb/openejb-trunk/examples/GreetingServiceTest
INFO - Stopping network services
INFO - Stopping server services
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.004 sec

Results :

Tests run: 2, Failures: 0, Errors: 0, Skipped: 0
----