master/pt/examples/cdi-events.html - tomee-site-pub - Git at Google

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               <h1>CDI Events - Acoplamento Solto e Extensibilidade</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div id="preamble">
 <div class="sectionbody">
 <div class="paragraph">
 <p>O CDI permite estender o código de negócios pelo padrão Notificador / Observador.</p>
 </div>
 <div class="paragraph">
 <p>Para fazer isso, basta injetar um campo <code>Event</code> na classe notifier. Essa classe é um modelo e o tipo de parâmetro é o tipo de objeto a ser disparado. Então, quando você quiser notificar observadores, você simplesmente chamará o método fire do objeto de evento passando como parâmetro o próprio evento.
 (sua própria classe!)</p>
 </div>
 <div class="paragraph">
 <p>Do outro lado, você anotou um parâmetro de método <code>@ Observes</code> e o tipo de parâmetro é o tipo enviado pelo notificador.</p>
 </div>
 <div class="admonitionblock note">
 <table>
 <tr>
 <td class="icon">
 <i class="fa icon-note" title="Note"></i>
 </td>
 <td class="content">
 Você pode adicionar qualificadores para ser mais preciso em seus eventos.
 </td>
 </tr>
 </table>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_exemplo">Exemplo</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>O exemplo é bem simples: um ejb usa a anotação <code>@ Schedule</code> para receber uma notificação a cada segundo.
 A cada segundo este EJB enviará a data atual por meio de eventos do CDI.</p>
 </div>
 <div class="paragraph">
 <p>Este é o nosso código de "negócios". É um comportamento simples (nada).</p>
 </div>
 <div class="paragraph">
 <p>Em nosso teste (que é considerado como uma extensão) criamos um observador (classe <code>Observer</code>)
 que simplesmente armazena e registra cada data recebida.</p>
 </div>
 <div class="paragraph">
 <p>O teste em si (<code>EventTest</code>) simplesmente verifica as datas que foram recebidas.</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_conclusão">Conclusão</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>CDI permite implementar facilmente plugins através deste mecanismo de eventos.</p>
 </div>
 <div class="paragraph">
 <p>Se você for mais longe e olhar para a API do plugin CDI, perceberá que é simplesmente o mesmo tipo
 de eventos. Os eventos do CDI são realmente a base do CDI.</p>
 </div>
 </div>
 </div>
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	<div class="col-md-12">
	<div class='page-header'>

	<h1>CDI Events - Acoplamento Solto e Extensibilidade</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<div id="preamble">
	<div class="sectionbody">
	<div class="paragraph">
	<p>O CDI permite estender o código de negócios pelo padrão Notificador / Observador.</p>
	</div>
	<div class="paragraph">
	<p>Para fazer isso, basta injetar um campo <code>Event</code> na classe notifier. Essa classe é um modelo e o tipo de parâmetro é o tipo de objeto a ser disparado. Então, quando você quiser notificar observadores, você simplesmente chamará o método fire do objeto de evento passando como parâmetro o próprio evento.
	(sua própria classe!)</p>
	</div>
	<div class="paragraph">
	<p>Do outro lado, você anotou um parâmetro de método <code>@ Observes</code> e o tipo de parâmetro é o tipo enviado pelo notificador.</p>
	</div>
	<div class="admonitionblock note">
	<table>
	<tr>
	<td class="icon">
	<i class="fa icon-note" title="Note"></i>
	</td>
	<td class="content">
	Você pode adicionar qualificadores para ser mais preciso em seus eventos.
	</td>
	</tr>
	</table>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_exemplo">Exemplo</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>O exemplo é bem simples: um ejb usa a anotação <code>@ Schedule</code> para receber uma notificação a cada segundo.
	A cada segundo este EJB enviará a data atual por meio de eventos do CDI.</p>
	</div>
	<div class="paragraph">
	<p>Este é o nosso código de "negócios". É um comportamento simples (nada).</p>
	</div>
	<div class="paragraph">
	<p>Em nosso teste (que é considerado como uma extensão) criamos um observador (classe <code>Observer</code>)
	que simplesmente armazena e registra cada data recebida.</p>
	</div>
	<div class="paragraph">
	<p>O teste em si (<code>EventTest</code>) simplesmente verifica as datas que foram recebidas.</p>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_conclusão">Conclusão</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>CDI permite implementar facilmente plugins através deste mecanismo de eventos.</p>
	</div>
	<div class="paragraph">
	<p>Se você for mais longe e olhar para a API do plugin CDI, perceberá que é simplesmente o mesmo tipo
	de eventos. Os eventos do CDI são realmente a base do CDI.</p>
	</div>
	</div>
	</div>
	</div>

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