Class MinimalMetricsSupport

All Implemented Interfaces:
MetricsSupport, RestServiceSupport, Service

public class MinimalMetricsSupport extends HelidonRestServiceSupport implements MetricsSupport
Minimal implementation of MetricsSupport.

Apps and other Helidon components which use MetricSupport (such as the MP metrics component) can very easily take advantage of the minimal implementation of the metrics registries and the metrics themselves if metrics is disabled via configuration or settings simply by using the MetricsSupport factory methods which, based on the metrics settings, might choose this implementation.

This implementation sets up the usual metrics-related endpoints but always sends a 404 response with an explanatory message.

  • Method Details

    • createEndpointForDisabledMetrics

      public static void createEndpointForDisabledMetrics(String endpointContext, Routing.Rules serviceEndpointRoutingRules)
      Adds routing rules so metrics-related requests go to the "not available" endpoint.
      endpointContext - web context for metrics
      serviceEndpointRoutingRules - routing rules for the metrics service
    • postConfigureEndpoint

      protected void postConfigureEndpoint(Routing.Rules defaultRules, Routing.Rules serviceEndpointRoutingRules)
      Description copied from class: HelidonRestServiceSupport
      Concrete implementations override this method to perform any service-specific routing set-up.
      Specified by:
      postConfigureEndpoint in class HelidonRestServiceSupport
      defaultRules - default Routing.Rules to be updated
      serviceEndpointRoutingRules - actual rules (if different from the default ones) to be updated for the service endpoint
    • prepareMetricsEndpoints

      public void prepareMetricsEndpoints(String endpointContext, Routing.Rules serviceEndpointRoutingRules)
      Description copied from interface: MetricsSupport
      Prepares the family of /metrics endpoints.

      By default, requests to the metrics endpoints trigger a 404 response with an explanatory message that metrics are disabled. Implementations of this interface can provide more informative endpoints.

      Specified by:
      prepareMetricsEndpoints in interface MetricsSupport
      endpointContext - context (typically /metrics)
      serviceEndpointRoutingRules - routing rules to update with the disabled metrics endpoints
    • update

      public void update(Routing.Rules rules)
      Description copied from interface: Service
      Updates Routing.Rules with handlers representing this service.
      Specified by:
      update in interface MetricsSupport
      Specified by:
      update in interface Service
      rules - a routing rules to update
    • configureVendorMetrics

      public void configureVendorMetrics(String routingName, Routing.Rules routingRules)
      Description copied from interface: MetricsSupport
      Sets up vendor metrics routing using the specified routing name and routing builder.
      Specified by:
      configureVendorMetrics in interface MetricsSupport
      routingName - routing name to use in setting up the vendor metrics
      routingRules - routing rules to modify