master/examples/mp-custom-healthcheck.html - tomee-site-pub - Git at Google

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               <h1>MicroProfile Custom Health Check</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div class="paragraph">
 <p>This is an example of how to use MicroProfile Custom Health Check in TomEE.</p>
 </div>
 <h4 id="_health_feature" class="discrete">Health Feature</h4>
 <div class="paragraph">
 <p>Health checks are used to probe the state of services and resources that an application might depend on or even to expose its
 state, e.g. in a cluster environment, where an unhealthy node needs to be discarded (terminated, shutdown) and eventually
 replaced by another healthy instance.</p>
 </div>
 <div class="paragraph">
 <p>By default, <a href="https://github.com/eclipse/microprofile-health">microprofile-health-api</a> provides a basic output of a node by
  simply hitting the endpoint <a href="http://host:port/health" class="bare">http://host:port/health</a>.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-json" data-lang="json">{"checks":[],"outcome":"UP","status":"UP"}</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>To provide a customized output, Let&#8217;s say we have an application that uses a Weather API, and if the service becomes
 unavailable, we should report the service as DOWN.</p>
 </div>
 <div class="paragraph">
 <p>To begin with a customized output, is needed to implement the interface <a href="https://github.com/eclipse/microprofile-health/blob/master/api/src/main/java/org/eclipse/microprofile/health/HealthCheck.java">HealthCheck</a>,
 make the class a managed bean by annotating it with <code>@ApplicationScoped</code> plus with <code>@Health</code> annotation to active the custom check.
 See more here <a href="https://github.com/apache/geronimo-health/blob/master/geronimo-health/src/main/java/org/apache/geronimo/microprofile/impl/health/cdi/GeronimoHealthExtension.java">GeronimoHealthExtension.java</a></p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">@Health
 @ApplicationScoped
 public class WeatherServiceHealthCheck implements HealthCheck {

     @Inject WeatherGateway weatherGateway;

     @Override
     public HealthCheckResponse call() {
         HealthCheckResponseBuilder responseBuilder = HealthCheckResponse.named("OpenWeatherMap");
         try {
             WeatherApiStatus status = weatherGateway.getApiStatus();
             return responseBuilder.withData("weatherServiceApiUrl", status.getUrl())
                     .withData("weatherServiceApiVersion", status.getVersion())
                     .withData("weatherServiceMessage", status.getMessage())
                     .up().build();
         } catch (WeatherException e) {
             return responseBuilder.withData("weatherServiceErrorMessage", e.getMessage()).down().build();
         }
     }
 }</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>In the example above, the health probe name is <a href="https://openweathermap.org/appid">OpenWeatherMap</a> (<em>illustrative only</em>) which provides a
 subscription plan to access its services and if the limit of calls is exceeded the API becomes unavailable until it&#8217;s renewed.</p>
 </div>
 <h3 id="_examples" class="discrete">Examples</h3>
 <div class="listingblock">
 <div class="title">Running the application</div>
 <div class="content">
 <pre>    mvn clean install tomee:run</pre>
 </div>
 </div>
 <h4 id="_example_1" class="discrete">Example 1</h4>
 <div class="paragraph">
 <p>When hitting /health endpoint, OpenWeatherMap tell us that our remaining calls are running out and we should take
 an action before it gets unavailable.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre>curl http://localhost:8080/mp-custom-healthcheck/health</pre>
 </div>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-json" data-lang="json">{
    "checks":[
       {
          "data":{
             "weatherServiceApiVersion":"2.5",
             "weatherServiceMessage":"Your account will become unavailable soon due to limitation of your
                                     subscription type. Remaining API calls are 1",
             "weatherServiceApiUrl":"http://api.openweathermap.org/data/2.5/"
          },
          "name":"OpenWeatherMap",
          "state":"UP"
       }
    ],
    "outcome":"UP",
    "status":"UP"
 }</code></pre>
 </div>
 </div>
 <h4 id="_example_2" class="discrete">Example 2</h4>
 <div class="paragraph">
 <p>Weather API still working fine.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre>curl http://localhost:8080/mp-custom-healthcheck/weather/day/status</pre>
 </div>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-text" data-lang="text">Hi, today is a sunny day!</code></pre>
 </div>
 </div>
 <h4 id="_example_3" class="discrete">Example 3</h4>
 <div class="paragraph">
 <p>When hitting one more time /health endpoint, OpenWeatherMap tell us that our account is temporary blocked and this
 service is being reported as DOWN.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre>curl http://localhost:8080/mp-custom-healthcheck/health</pre>
 </div>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-json" data-lang="json">{
    "checks":[
       {
          "data":{
             "weatherServiceErrorMessage":"Your account is temporary blocked due to exceeding of
             requests limitation of your subscription type. Please choose the proper subscription
             http://openweathermap.org/price"
          },
          "name":"weatherservice",
          "state":"DOWN"
       }
    ],
    "outcome":"DOWN",
    "status":"DOWN"
 }</code></pre>
 </div>
 </div>
 <h4 id="_example_4" class="discrete">Example 4</h4>
 <div class="paragraph">
 <p>Weather API has stopped.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre>curl http://localhost:8080/mp-custom-healthcheck/weather/day/status</pre>
 </div>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-text" data-lang="text">Weather Service is unavailable at moment, retry later.</code></pre>
 </div>
 </div>
 <h5 id="_running_the_tests" class="discrete">Running the tests</h5>
 <div class="paragraph">
 <p>You can also try it out using the <a href="src/test/java/org/superbiz/rest/WeatherServiceTest.java">WeatherServiceTest.java</a> available in the project.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre>mvn clean test</pre>
 </div>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre>[INFO] Results:
 [INFO]
 [INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped:</pre>
 </div>
 </div>
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	<h1>MicroProfile Custom Health Check</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<div class="paragraph">
	<p>This is an example of how to use MicroProfile Custom Health Check in TomEE.</p>
	</div>
	<h4 id="_health_feature" class="discrete">Health Feature</h4>
	<div class="paragraph">
	<p>Health checks are used to probe the state of services and resources that an application might depend on or even to expose its
	state, e.g. in a cluster environment, where an unhealthy node needs to be discarded (terminated, shutdown) and eventually
	replaced by another healthy instance.</p>
	</div>
	<div class="paragraph">
	<p>By default, <a href="https://github.com/eclipse/microprofile-health">microprofile-health-api</a> provides a basic output of a node by
	simply hitting the endpoint <a href="http://host:port/health" class="bare">http://host:port/health</a>.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-json" data-lang="json">{"checks":[],"outcome":"UP","status":"UP"}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>To provide a customized output, Let’s say we have an application that uses a Weather API, and if the service becomes
	unavailable, we should report the service as DOWN.</p>
	</div>
	<div class="paragraph">
	<p>To begin with a customized output, is needed to implement the interface <a href="https://github.com/eclipse/microprofile-health/blob/master/api/src/main/java/org/eclipse/microprofile/health/HealthCheck.java">HealthCheck</a>,
	make the class a managed bean by annotating it with <code>@ApplicationScoped</code> plus with <code>@Health</code> annotation to active the custom check.
	See more here <a href="https://github.com/apache/geronimo-health/blob/master/geronimo-health/src/main/java/org/apache/geronimo/microprofile/impl/health/cdi/GeronimoHealthExtension.java">GeronimoHealthExtension.java</a></p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">@Health
	@ApplicationScoped
	public class WeatherServiceHealthCheck implements HealthCheck {

	@Inject WeatherGateway weatherGateway;

	@Override
	public HealthCheckResponse call() {
	HealthCheckResponseBuilder responseBuilder = HealthCheckResponse.named("OpenWeatherMap");
	try {
	WeatherApiStatus status = weatherGateway.getApiStatus();
	return responseBuilder.withData("weatherServiceApiUrl", status.getUrl())
	.withData("weatherServiceApiVersion", status.getVersion())
	.withData("weatherServiceMessage", status.getMessage())
	.up().build();
	} catch (WeatherException e) {
	return responseBuilder.withData("weatherServiceErrorMessage", e.getMessage()).down().build();
	}
	}
	}</code></pre>
	</div>
	</div>
	<div class="paragraph">
	<p>In the example above, the health probe name is <a href="https://openweathermap.org/appid">OpenWeatherMap</a> (<em>illustrative only</em>) which provides a
	subscription plan to access its services and if the limit of calls is exceeded the API becomes unavailable until it’s renewed.</p>
	</div>
	<h3 id="_examples" class="discrete">Examples</h3>
	<div class="listingblock">
	<div class="title">Running the application</div>
	<div class="content">
	<pre> mvn clean install tomee:run</pre>
	</div>
	</div>
	<h4 id="_example_1" class="discrete">Example 1</h4>
	<div class="paragraph">
	<p>When hitting /health endpoint, OpenWeatherMap tell us that our remaining calls are running out and we should take
	an action before it gets unavailable.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre>curl http://localhost:8080/mp-custom-healthcheck/health</pre>
	</div>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-json" data-lang="json">{
	"checks":[
	{
	"data":{
	"weatherServiceApiVersion":"2.5",
	"weatherServiceMessage":"Your account will become unavailable soon due to limitation of your
	subscription type. Remaining API calls are 1",
	"weatherServiceApiUrl":"http://api.openweathermap.org/data/2.5/"
	},
	"name":"OpenWeatherMap",
	"state":"UP"
	}
	],
	"outcome":"UP",
	"status":"UP"
	}</code></pre>
	</div>
	</div>
	<h4 id="_example_2" class="discrete">Example 2</h4>
	<div class="paragraph">
	<p>Weather API still working fine.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre>curl http://localhost:8080/mp-custom-healthcheck/weather/day/status</pre>
	</div>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-text" data-lang="text">Hi, today is a sunny day!</code></pre>
	</div>
	</div>
	<h4 id="_example_3" class="discrete">Example 3</h4>
	<div class="paragraph">
	<p>When hitting one more time /health endpoint, OpenWeatherMap tell us that our account is temporary blocked and this
	service is being reported as DOWN.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre>curl http://localhost:8080/mp-custom-healthcheck/health</pre>
	</div>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-json" data-lang="json">{
	"checks":[
	{
	"data":{
	"weatherServiceErrorMessage":"Your account is temporary blocked due to exceeding of
	requests limitation of your subscription type. Please choose the proper subscription
	http://openweathermap.org/price"
	},
	"name":"weatherservice",
	"state":"DOWN"
	}
	],
	"outcome":"DOWN",
	"status":"DOWN"
	}</code></pre>
	</div>
	</div>
	<h4 id="_example_4" class="discrete">Example 4</h4>
	<div class="paragraph">
	<p>Weather API has stopped.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre>curl http://localhost:8080/mp-custom-healthcheck/weather/day/status</pre>
	</div>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-text" data-lang="text">Weather Service is unavailable at moment, retry later.</code></pre>
	</div>
	</div>
	<h5 id="_running_the_tests" class="discrete">Running the tests</h5>
	<div class="paragraph">
	<p>You can also try it out using the <a href="src/test/java/org/superbiz/rest/WeatherServiceTest.java">WeatherServiceTest.java</a> available in the project.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre>mvn clean test</pre>
	</div>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre>[INFO] Results:
	[INFO]
	[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped:</pre>
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