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| <h1>MicroProfile Fault Tolerance - Fallback</h1> |
| </div> |
| </div> |
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| |
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| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Este é um exemplo de como usar o Microprofile @Fallback no TomEE.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_recurso_de_fallback">Recurso de Fallback</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Fault Tolerance Fallback fornece uma alternativa no caso de falha de uma execução. Esta alternativa será chamada quando |
| um <code>Retry</code> ou <code>CircuitBreaker</code> falhar.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Para usar esta funcionalidade é necessario anotar o método com <code>@Fallback</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>As politicas do Fallback permitem configurar :</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><strong>value</strong>: Uma classe que implementa o <code>FallbackHandler</code></p> |
| </li> |
| <li> |
| <p><strong>fallbackMethod</strong>: O método que será executado.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Os Parâmetros <code>value</code> e `fallbackMethod`eles não podem ser especificados ao mesmo tempo.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Para mais detalhes, verifique a <a href="http://download.eclipse.org/microprofile/microprofile-fault-tolerance-1.1/microprofile-fault-tolerance-spec.html">Especificação</a> .</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_exemplos">Exemplos</h2> |
| <div class="sectionbody"> |
| <div class="sect2"> |
| <h3 id="_executando_o_aplicativo">Executando o aplicativo</h3> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>mvn clean install tomee:run</pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_exemplo_1">Exemplo 1</h3> |
| <div class="paragraph"> |
| <p>O método <code>statusOfDay</code> sempre falhará lançando <code>WeatherException</code> e como a anotação |
| <code>@CircuitBreaker</code> esta configurada com <code>failOn</code> no caso de uma exceção, o fallback, |
| <code>WeatherDayStatusFallbackHandler#handle</code> será invocado.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">@RequestScoped |
| public class WeatherService { |
| ... |
| @GET |
| @Path("/day/status") |
| @CircuitBreaker(failOn = WeatherException.class) |
| @Fallback(WeatherDayStatusFallbackHandler.class) |
| public String dayStatus() { |
| throw new WeatherException(); |
| } |
| ... |
| } |
| |
| public class WeatherDayStatusFallbackHandler implements FallbackHandler<String> { |
| |
| @Override |
| public String handle(ExecutionContext executionContext) { |
| return "Hi, today is a sunny day!"; |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Chamada de status do dia</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>GET http://localhost:8080/mp-faulttolerance-fallback/weather/day/status</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Log do servidor</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code>SEVERE [http-nio-8080-exec-2] org.superbiz.rest.WeatherDayStatusFallbackHandler.handle WeatherDayStatusFallbackHandler was triggered due a fail</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Resposta</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code>Hi, today is a sunny day!</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_exemplo_2">Exemplo 2</h3> |
| <div class="paragraph"> |
| <p>O método <code>statusOfDay</code> sempre falhará lançando <code>WeatherException</code> e como a anotação |
| <code>@Retry</code> está configurada com <code>maxRetries = 1</code> no caso de falha, o método fallback, |
| <code>fallbackForWeekStatus</code> será invocado após tentar novamente uma vez.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code class="language-java" data-lang="java">@RequestScoped |
| public class WeatherService { |
| ... |
| @GET |
| @Path("/week/status") |
| @Retry(maxRetries = 1) |
| @Fallback(fallbackMethod = "fallbackForWeekStatus") |
| public String weekStatus() { |
| throw new WeatherException(); |
| } |
| |
| public String fallbackForWeekStatus() { |
| return "Hi, week will be mostly sunny!"; |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Chamada de status do dia</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>GET http://localhost:8080/mp-faulttolerance-fallback/weather/week/status</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Log do servidor</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code>SEVERE [http-nio-8080-exec-2] org.superbiz.rest.WeatherService.fallbackForWeekStatus Fallback was triggered due a fail</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Resposta</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code>Hi, week will be mostly sunny!</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="_execução_dos_testes">Execução dos testes</h3> |
| <div class="paragraph"> |
| <p>Você também pode usar o teste <a href="src/test/java/org/superbiz/rest/WeatherServiceTest.java">WeatherServiceTest.java</a> disponivel neste projeto.</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>mvn clean test</pre> |
| </div> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlight"><code>[INFO] Results: |
| [INFO] |
| [INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0</code></pre> |
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