t

nl.grons.metrics4.scala

FreshRegistries

trait FreshRegistries extends AnyRef

A mixin trait to get a fresh empty metric and health check registry every time.

Often a singleton service class defines a gauge with a static name. However, during testing multiple instances are needed. Unfortunately the metrics registry doesn't allow registering a gauge under the same name twice. This is not a problem when a new registry is used for each instance.

The same is the case for health checks (since dropwizard-metrics 4.1).

*Example*

With the following gauge in class Example:

class Example(db: Database) extends nl.grons.metrics4.scala.DefaultInstrumented {
  // Define a gauge with a static name
  metrics.gauge("aGauge") { db.rowCount() }
}

This trait can be mixed in with any instance of Example:

val example = new Example(db) with FreshRegistries

See also FreshMetricRegistry and FreshHealthCheckRegistry in case your class only extends InstrumentedBuilder or CheckedBuilder respectively.

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FreshRegistries with InstrumentedBuilder with CheckedBuilder
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