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https://issues.apache.org/jira/browse/FLINK-4920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15664157#comment-15664157
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Chesnay Schepler commented on FLINK-4920:
-----------------------------------------
Currently, in order to create a Gauge that simply returns 4 in Scala you have
to write the following:
{code}
MetricGroup heap = ...
heap.gauge[Long, Gauge[Long]]("Max", new Gauge[Long] {
override def getValue: Long = 4
})
{code}
This issue is about allowing something the following:
{code}
MetricGroup heap = ...
heap.gauge[Long, Gauge[Long]]("Max", new ScalaGauge[Long](() => 4))
{code}
ScalaGauge will implement the Gauge interface.
The above example should be supportable by adding a constructor like
ScalaGauge(fun: () => T).
But there's probably a lot more wizard stuff you can do with a Scala-specific
gauge type; someone else will have to chime in with suggestions.
> Add a Scala Function Gauge
> --------------------------
>
> Key: FLINK-4920
> URL: https://issues.apache.org/jira/browse/FLINK-4920
> Project: Flink
> Issue Type: Improvement
> Components: Metrics, Scala API
> Reporter: Stephan Ewen
> Labels: easyfix, starter
>
> A useful metrics utility for the Scala API would be to add a Gauge that
> obtains its value by calling a Scala Function0.
> That way, one can add Gauges in Scala programs using Scala lambda notation or
> function references.
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