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<h1>Tolerancia a fallos (Fault Tolerance) en MicroProfile - Timeout (Tiempo de espera)</h1>
</div>
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<div class="col-md-12">
<div class="paragraph">
<p>Este es un ejemplo de como usar Microprofile <code>@Timeout</code> en TomEE.</p>
</div>
<h2 id="_funcionalidad_de_tiempo_de_espera_timeout" class="discrete">Funcionalidad de tiempo de espera (Timeout)</h2>
<div class="paragraph">
<p><code>Fault Tolerance Timeout</code> permite especificar cuánto tiempo puede tomar una tarea en completar su ejecución y abortarla en caso que tarde más del tiempo especificado. La funcionalidad de Timeout puede ser usada en conjunto con otras anotaciones para guiar la ejecución y resultado de una tarea. Mira la
<a href="https://download.eclipse.org/microprofile/microprofile-fault-tolerance-1.1/microprofile-fault-tolerance-spec.html#_timeout_usage">especificación</a>
para mas detalles.</p>
</div>
<div class="paragraph">
<p>La anotación <code>@Timeout</code> permite configurar:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><strong>value:</strong> el valor del tiempo de espera</p>
</li>
<li>
<p><strong>unit:</strong> la unidad del tiempo de espera</p>
</li>
</ul>
</div>
<h2 id="_ejemplo" class="discrete">Ejemplo</h2>
<h3 id="_ejecuta_la_aplicación" class="discrete">Ejecuta la aplicación</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_esto" class="discrete">Como funciona esto?</h3>
<div class="paragraph">
<p>El método <code>statusOfDayByAccuWeather</code> falla cuando se alcanza el umbral de la
anotación <code>@Timeout</code> debido a una larga ejecución del método
<code>longProcessingTask</code>. Para responder bien a la solicitud, se ejecutará un
método alternativo para completar la solicitud exitosamente. El método
alternativo está determinado por la anotación <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>Llamada al estado del día</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 en el 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>Respuesta 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="_ejecutando_las_pruebas" class="discrete">Ejecutando las pruebas</h3>
<div class="paragraph">
<p>También puedes probarlo usando el
<a href="src/test/java/org/superbiz/rest/WeatherServiceTest.java">WeatherServiceTest.java</a> disponible en el proyecto.</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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