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| <h1>CDI @Qualifier</h1> |
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| |
| <div class="col-md-12"> |
| <div class="sect1"> |
| <h2 id="_introduction">Introduction</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Sometimes we need write several implementation for a interface of rule business, to increase uncoupling let’s inject only interface and CDI choose the right implementation, to help CDI with this choice was created the <strong>Qualifiers</strong>.</p> |
| </div> |
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| </div> |
| <div class="sect1"> |
| <h2 id="_example">Example</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>In this example, we have an interface <code>Payment</code> and theirs implementations: |
| * Cash |
| * CreditCard</p> |
| </div> |
| <div class="paragraph"> |
| <p>In our test (Payment Test) we inject only the interface Payment, without the Qualifier feature the CDI would not known which implementation to inject in test.</p> |
| </div> |
| <div class="paragraph"> |
| <p>We created a <strong>Qualifier</strong> called <code>PaymentQualifier</code> a single qualifier with only one difference, the annotation <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>This qualifier has a method named <code>type()</code>, this method will help the CDI to inject correctly implementation. see this 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>now see an implementation</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>Each implementation should marked with this qualifier.</p> |
| </div> |
| <div class="paragraph"> |
| <p>How to inject? see simplicity</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) //qualifier informing the CDI about the correctly implementation |
| private Payment paymentCreditCard; |
| |
| @Inject |
| @PaymentQualifier(type=PaymentType.CASH) //qualifier informing the CDI about the correctly implementation |
| 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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