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<h1>Tolerância a falhas (Fault Tolerance) no MicroProfile - Timeout (Tempo de espera)</h1>
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<div class="paragraph">
<p>Este é um exemplo de como usar o Microprofile <code>@Timeout</code> no TomEE.</p>
</div>
<h2 id="_funcionalidade_de_tiempo_de_espera_timeout" class="discrete">Funcionalidade de tiempo de espera (Timeout)</h2>
<div class="paragraph">
<p><code>Fault Tolerance Timeout</code> permite especificar quanto tempo pode tomar uma tarefa em completar sua execução e abortá-lo caso demore mais que o tempo especificado. A funcionalidade de Timeout pode ser usada em conjunto com outras anotações para guiar a execução e resultado de uma tarefa. Olhe para o
<a href="https://download.eclipse.org/microprofile/microprofile-fault-tolerance-1.1/microprofile-fault-tolerance-spec.html#_timeout_usage">especificación</a>
para mais detalles.</p>
</div>
<div class="paragraph">
<p>A anotação <code>@Timeout</code> permite configurar:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><strong>value:</strong> o valor do tempo de espera</p>
</li>
<li>
<p><strong>unit:</strong> a unidade do tempo de espera</p>
</li>
</ul>
</div>
<h2 id="_exemplo" class="discrete">Exemplo</h2>
<h3 id="_execute_o_aplicativo" class="discrete">Execute o aplicativo</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-bash" data-lang="bash">mvn clean install tomee:run</code></pre>
</div>
</div>
<h3 id="_como_funciona_isto" class="discrete">Como funciona isto?</h3>
<div class="paragraph">
<p>O método <code>statusOfDayByAccuWeather</code> falha quando se atinge o limiar da
anotação <code>@Timeout</code> devido a uma larga execução do método
<code>longProcessingTask</code>. Para responder bem a solicitação, se executará um
método alternativo para completar a solicitação exitosamente. O método
alternativo está determinado pela anotação <code>@Fallback</code>.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@RequestScoped
public class WeatherGateway {
private static final Logger LOGGER = Logger.getLogger(WeatherGateway.class.getName());
@Timeout(50)
@Fallback(fallbackMethod = "statusOfWeekByMetEireann")
public String statusOfDayByAccuWeather(){
return longProcessingTask();
}
public String statusOfWeekByMetEireann(){
LOGGER.log(Level.WARNING, "MetEireann backup service has been requested due to AccuWeather timeout");
return "Beautiful day";
}
private String longProcessingTask(){
try {
Thread.sleep(80);
} catch (InterruptedException e) {
LOGGER.log(Level.WARNING,"AccuWeather task has been interrupted.");
}
return null;
}
...
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Chamada para o estado do dia</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-text" data-lang="text">GET http://localhost:8080/mp-faulttolerance-timeout/weather/day/status</code></pre>
</div>
</div>
<div class="paragraph">
<p>Logs do Servidor</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-text" data-lang="text">WARNING AccuWeather task has been interrupted.
WARNING MetEireann fallback service has been requested due to AccuWeather timeout.</code></pre>
</div>
</div>
<div class="paragraph">
<p>Resposta HTTP</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-text" data-lang="text">Beautiful day!</code></pre>
</div>
</div>
<h3 id="_executando_os_testes" class="discrete">Executando os testes</h3>
<div class="paragraph">
<p>Você também pode experimentá-lo usando o
<a href="src/test/java/org/superbiz/rest/WeatherServiceTest.java">WeatherServiceTest.java</a> disponível no projeto.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-text" data-lang="text">mvn clean test</code></pre>
</div>
</div>
<div class="listingblock">
<div class="content">
<pre>[INFO] Results:
[INFO]
[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0</pre>
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