t

nl.grons.metrics.scala

CheckedBuilder

trait CheckedBuilder extends BaseBuilder

The mixin trait for creating a class which creates health checks.

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Abstract Value Members

  1. abstract val registry: HealthCheckRegistry

    The com.codahale.metrics.health.HealthCheckRegistry where created metrics are registered.

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. final def asInstanceOf[T0]: T0
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  5. def clone(): AnyRef
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  8. def finalize(): Unit
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  9. final def getClass(): Class[_]
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  10. def hashCode(): Int
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  11. def healthCheck[T](name: String, unhealthyMessage: String = "Health check failed")(checker: ⇒ T)(implicit toMagnet: (ByName[T]) ⇒ HealthCheckMagnet): HealthCheck

    Converts a code block to a com.codahale.metrics.health.HealthCheck and registers it.

    Converts a code block to a com.codahale.metrics.health.HealthCheck and registers it.

    Use it as follows:

    object Application {
  // The application wide health check registry.
  val healthCheckRegistry = new com.codahale.metrics.health.HealthCheckRegistry()
}
trait Checked extends CheckedBuilder {
  val registry = Application.healthCheckRegistry
}

class ExampleWorker extends Checked {
  healthCheck("alive") { workerThreadIsActive() }
}

    The code block must have a result of type Boolean, Try, Either, Future, com.codahale.metrics.health.HealthCheck.Result, or simply Unit.

    • A check result of true indicates healthy, false indicates unhealthy.
    • A check result of type Success indicates healthy, Failure indicates unhealthy. The embedded value (after applying .toString) or throwable is used as (un)healthy message.
    • A check result of type Future will have 3 seconds to execute (by default). The result of the execution will be treated as Success or Failure.
    • A check result of type Right indicates healthy, Left[Any] or Left[Throwable] indicates unhealthy. The embedded value (after applying .toString) or throwable is used as (un)healthy message.
    • If the check result is of type com.codahale.metrics.health.HealthCheck.Result, the result is passed unchanged.
    • A check result of type Unit indicates healthy.
    • If a checker throws an exception, the result is considered unhealthy with the throwable as unhealthy message.

    It is also possible to override the health check base name. For example:

    class ExampleWorker extends Checked {
  override lazy val metricBaseName = MetricName("Overridden.Base.Name")
  healthCheck("alive") { workerThreadIsActive() }
}

    To change the timeout for Future execution, set an implicit duration:

    class ExampleWorker extends Checked {
  implicit private val timeout = 10.seconds
  healthCheck("alive")(Future { workerThreadIsActive() })
}
    name

    the name of the health check

    unhealthyMessage

    the unhealthy message for checkers that return false, defaults to "Health check failed"

    checker

    the code block that does the health check

  12. final def isInstanceOf[T0]: Boolean
    Definition Classes
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  13. lazy val metricBaseName: MetricName

    The base name for all metrics created from this builder.

    The base name for all metrics created from this builder.

    Definition Classes
    BaseBuilder
  14. final def ne(arg0: AnyRef): Boolean
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  15. final def notify(): Unit
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  16. final def notifyAll(): Unit
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  17. final def synchronized[T0](arg0: ⇒ T0): T0
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  18. def toString(): String
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  19. final def wait(): Unit
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  20. final def wait(arg0: Long, arg1: Int): Unit
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    @throws( ... )
  21. final def wait(arg0: Long): Unit
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