latest/pt/examples/cdi-qualifier.html - tomee-site-pub - Git at Google

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               <h1>CDI @Qualifier</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div class="sect1">
 <h2 id="_introdução">Introdução</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>As vezes precisamos escrever várias implementações para uma interface de regras de negócios, para aumentar o desacoplamento vamos injetar apenas a interface e o CDI vai escolher a implementação correta, para ajudar o CDI com esta escolha nós criamos os <strong>qualificadores</strong>.</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_exemplo">Exemplo</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>Neste exemplo, temos uma interface <code>Payment</code> e suas implementações:
 * Cash
 * CreditCard</p>
 </div>
 <div class="paragraph">
 <p>Em nosso teste (Payment Test) nós injetamos somente a interface Payment, sem o recurso Qualificador, o CDI não saberia qual implementação injetar no teste.</p>
 </div>
 <div class="paragraph">
 <p>Nós criamos um <strong>qualificador</strong> chamado <code>PaymentQualifier</code> um único qualificador com uma diferença, a anotação <code>@Qualifier</code>.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">@Retention(RUNTIME)
 @Target({ TYPE, FIELD, METHOD })
 @Qualifier
 public @interface PaymentQualifier {

 	PaymentType type();
 }</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>Este qualificador tem um método chamado <code>type()</code>, esse método ajudará o CDI a injetar corretamente a implementação. veja este enum:</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">public enum PaymentType {

 	CASH,
 	CREDITCARD
 }</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>agora veja uma implementação</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">@PaymentQualifier(type=PaymentType.CASH)
 public class Cash implements Payment {

 	@Override
 	public String pay() {

 		return "cash";
 	}
 }</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>Cada implementação deve ser marcada com este qualificador.</p>
 </div>
 <div class="paragraph">
 <p>Como injetar ? veja a simplicidade</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">public class PaymentTest {

     private static EJBContainer container;

     @Inject
     @PaymentQualifier(type=PaymentType.CREDITCARD) //qualificador informando o CDI sobre a implementação correta
     private Payment paymentCreditCard;

     @Inject
     @PaymentQualifier(type=PaymentType.CASH) //qualificador informando o CDI sobre a implementação correta
     private Payment paymentCash;

     @BeforeClass
     public static void start() {
         container = EJBContainer.createEJBContainer();
     }

     @Before
     public void setUp() throws Exception {
         container.getContext().bind("inject", this);
     }

     @Test
     public void mustReturnCreditCard() {

         assertEquals(paymentCreditCard.pay(), "creditCard");
     }

     @Test
     public void mustReturnCash() {

         assertEquals(paymentCash.pay(), "cash");
     }

     @AfterClass
     public static void stop() {
         container.close();
     }
 }</code></pre>
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	<div class='page-header'>

	<h1>CDI @Qualifier</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<div class="sect1">
	<h2 id="_introdução">Introdução</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>As vezes precisamos escrever várias implementações para uma interface de regras de negócios, para aumentar o desacoplamento vamos injetar apenas a interface e o CDI vai escolher a implementação correta, para ajudar o CDI com esta escolha nós criamos os <strong>qualificadores</strong>.</p>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_exemplo">Exemplo</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>Neste exemplo, temos uma interface <code>Payment</code> e suas implementações:
	* Cash
	* CreditCard</p>
	</div>
	<div class="paragraph">
	<p>Em nosso teste (Payment Test) nós injetamos somente a interface Payment, sem o recurso Qualificador, o CDI não saberia qual implementação injetar no teste.</p>
	</div>
	<div class="paragraph">
	<p>Nós criamos um <strong>qualificador</strong> chamado <code>PaymentQualifier</code> um único qualificador com uma diferença, a anotação <code>@Qualifier</code>.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">@Retention(RUNTIME)
	@Target({ TYPE, FIELD, METHOD })
	@Qualifier
	public @interface PaymentQualifier {

	PaymentType type();
	}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>Este qualificador tem um método chamado <code>type()</code>, esse método ajudará o CDI a injetar corretamente a implementação. veja este enum:</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">public enum PaymentType {

	CASH,
	CREDITCARD
	}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>agora veja uma implementação</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">@PaymentQualifier(type=PaymentType.CASH)
	public class Cash implements Payment {

	@Override
	public String pay() {

	return "cash";
	}
	}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>Cada implementação deve ser marcada com este qualificador.</p>
	</div>
	<div class="paragraph">
	<p>Como injetar ? veja a simplicidade</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">public class PaymentTest {

	private static EJBContainer container;

	@Inject
	@PaymentQualifier(type=PaymentType.CREDITCARD) //qualificador informando o CDI sobre a implementação correta
	private Payment paymentCreditCard;

	@Inject
	@PaymentQualifier(type=PaymentType.CASH) //qualificador informando o CDI sobre a implementação correta
	private Payment paymentCash;

	@BeforeClass
	public static void start() {
	container = EJBContainer.createEJBContainer();
	}

	@Before
	public void setUp() throws Exception {
	container.getContext().bind("inject", this);
	}

	@Test
	public void mustReturnCreditCard() {

	assertEquals(paymentCreditCard.pay(), "creditCard");
	}

	@Test
	public void mustReturnCash() {

	assertEquals(paymentCash.pay(), "cash");
	}

	@AfterClass
	public static void stop() {
	container.close();
	}
	}</code></pre>
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