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https://issues.apache.org/jira/browse/FLINK-6053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16367997#comment-16367997
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ASF GitHub Bot commented on FLINK-6053:
---------------------------------------
Github user bowenli86 commented on the issue:
https://github.com/apache/flink/pull/5501
LGTM generally.
I still feel having all the `instanceof` in `notifyOfAddedMetric` and
`notifyOfRemovedMetric` is a bit inelegant. I'm fine with it since there'll
(hopefully) be only a limited number of metric types, so the `instanceof`
clauses won't grow insanely.
> Gauge<T> should only take subclasses of Number, rather than everything
> ----------------------------------------------------------------------
>
> Key: FLINK-6053
> URL: https://issues.apache.org/jira/browse/FLINK-6053
> Project: Flink
> Issue Type: Improvement
> Components: Metrics
> Affects Versions: 1.2.0
> Reporter: Bowen Li
> Assignee: Chesnay Schepler
> Priority: Major
> Fix For: 1.5.0
>
>
> Currently, Flink's Gauge is defined as
> ```java
> public interface Gauge<T> extends Metric {
> T getValue();
> }
> ```
> But it doesn't make sense to have Gauge take generic types other than Number.
> And it blocks I from finishing FLINK-6013, because I cannot assume Gauge is
> only about Number. So the class should be like
> ```java
> public interface Gauge<T extends Number> extends Metric {
> T getValue();
> }
> ```
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