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| <h1>CDI Dynamic Inject</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 dinamicamente a implementação em tempo de execução.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_exemplo_1">Exemplo 1</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Neste exemplo, temos uma interface <code>Payment</code> e suas implementações:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Cash</p> |
| </li> |
| <li> |
| <p>CreditCard</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Em nosso teste (<code>FinalizePaymentTest</code>) nós injetamos a classe FinalizePayment, e chamamos o método <code>finishWithCash</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Esse método irá injetar dinamicamente a implementação correta usando os recursos do CDI</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">public String finishWithCash() { |
| |
| paymentChoosed = paymentsLazy.select(Cash.class).get(); |
| return paymentChoosed.pay(); |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>observe que está sendo usado uma variável chamada de <code>paymentsLazy</code> essa variável irá conter todas as implementações da interface <code>Payment</code></p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">@Inject |
| @Any |
| private Instance<Payment> paymentsLazy;</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Nessa variável estamos usando:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Anotação <code>@inject</code></p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Indica ao CDI que gostariamos de realizar um injeção de dependencia</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Anotação <code>@Any</code></p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Indicar que deve ser listada todas as implementações possíveis.</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Objeto <code>Instance</code></p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Objeto responsável por conhecer todas as implementações possíveis e instancia-las no momento desejado.</p> |
| </div> |
| <div class="paragraph"> |
| <p>com essa variável pronta podemos chama-la usando o:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">paymentsLazy.select(Cash.class).get();</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>onde <code>Cash.class</code> informa qual e a implementação e <code>.get()</code> retorna a instancia pronta para uso.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_exemplo_2">Exemplo 2</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Neste exemplo, temos uma interface <code>Payment</code> e suas implementações:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Cash</p> |
| </li> |
| <li> |
| <p>CreditCard</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Em nosso teste (<code>FinalizePaymentQualifierTest</code>) nós injetamos a classe FinalizePayment, e chamamos o método <code>finishByQualifier</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Esse método irá injetar dinamicamente a implementação correta usando um <code>Qualifier</code>(PaymentType).</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">public String finishByQualifier(PaymentType type) { |
| |
| paymentChoosed = paymentsLazy.select( new PayByQualifier(type) ).get(); |
| return paymentChoosed.pay(); |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Para essa abordagem funcionar precisaremos criar uma nova classe chamada <code>PayByQualifier</code> que extende <code>AnnotationLiteral</code> que espera a passagem de um qualifier em seu parametro <code>T extends Annotation</code>(Generics).</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">public class PayByQualifier extends AnnotationLiteral<PaymentQualifier> implements PaymentQualifier { |
| |
| private PaymentType type; |
| |
| public PayByQualifier(PaymentType type) { |
| |
| this.type = type; |
| } |
| |
| @Override |
| public PaymentType type() { |
| return this.type; |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>o importante e implementar o método da Anotação em nosso caso o <code>public PaymentType type();</code></p> |
| </div> |
| <div class="paragraph"> |
| <p>Para faciliar essa implementação recebemos esse valor por construtor de nossa nova classe</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">public PayByQualifier(PaymentType type) { |
| |
| this.type = type; |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Com essa classe pronta podemos usa-la em nossa classe de negócio:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">paymentChoosed = paymentsLazy.select( new PayByQualifier(type) ).get();</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Obs: A estrutura de qualifier foi reaproveitada do project <a href="https://github.com/cassunde/tomee/tree/master/examples/cdi-qualifier" class="bare">https://github.com/cassunde/tomee/tree/master/examples/cdi-qualifier</a></p> |
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