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| <h1 class="page"><code>HealthCheckService</code></h1> |
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| <p>This SPI service integrates with Spring Boot’s <a href="https://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/actuate/health/HealthIndicator.html">HealthIndicator</a> SPI, surfaced through the <a href="https://docs.spring.io/spring-boot/docs/current/reference/html/production-ready-features.html">Spring Boot Actuator</a>.</p> |
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| <p>This service was introduced to allow deployment infrastructure to monitor the app and (potentially) restart it if required. |
| For example, if deploying to Docker then both Docker Swarm and Kubernetes are orchestrators that can perform this task.</p> |
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| <h2 id="spi"><a class="anchor" href="#spi"></a>SPI</h2> |
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| <p>The SPI defined by <code>HealthCheckService</code> is:</p> |
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| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public interface HealthCheckService { |
| |
| Health check(); |
| |
| }</code></pre> |
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| <h2 id="implementation"><a class="anchor" href="#implementation"></a>Implementation</h2> |
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| <div class="paragraph"> |
| <p>The framework provides no default implementation, but the <a href="../../../docs/latest/starters/simpleapp.html" class="page">simpleapp</a> starter app provides a sample implementation:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@Service |
| @Named("domainapp.HealthCheckServiceImpl") |
| @Log4j2 |
| public class HealthCheckServiceImpl implements HealthCheckService { |
| |
| private final SimpleObjects simpleObjects; |
| |
| @Inject |
| public HealthCheckServiceImpl(SimpleObjects simpleObjects) { |
| this.simpleObjects = simpleObjects; |
| } |
| |
| @Override |
| public Health check() { |
| try { |
| simpleObjects.ping(); |
| return Health.ok(); |
| } catch (Exception ex) { |
| return Health.error(ex); |
| } |
| } |
| }</code></pre> |
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| <h2 id="related-services"><a class="anchor" href="#related-services"></a>Related Services</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The internal domain service <code>o.a.i.core.webapp.health.HealthIndicatorUsingHealthCheckService</code> acts as the bridge between Spring and the `HealthCheckService' SPI.</p> |
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