[jira] [Created] (SLING-10967) Improve Gauge support in metrics

["Joerg Hoh (Jira)" <ji...@apache.org>]

Joerg Hoh created SLING-10967:
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             Summary: Improve Gauge support in metrics
                 Key: SLING-10967
                 URL: https://issues.apache.org/jira/browse/SLING-10967
             Project: Sling
          Issue Type: Improvement
          Components: Commons
    Affects Versions: Commons Metrics 1.2.8
            Reporter: Joerg Hoh


Currently Sling Metrics only support Gauges via the whiteboard approach (see SLING-5966).

To leverage gauges you have to register a gauge instance by yourself using the OSGI Framework API and also its whole livecycle. The Sling MetricsService should be able to handle this for you as well like it does for the other metric types (e.g. counter).

I propose to extend the MetricsService by a new method:
{code}
Gauge<T> registerGauge (String name, Supplier<T> supplier);
{code}

which registers a Gauge which on every request to {{getValue()}} calls the provided supplier. In most cases the returned Gauge object is not used, but it is returned for consistency with other methods of the MetricsService.










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