[jira] [Updated] (FLINK-6053) Gauge should only take subclasses of Number, rather than everything

["Till Rohrmann (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-6053?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Till Rohrmann updated FLINK-6053:
---------------------------------
    Fix Version/s: 1.8.0

> 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: 1.7.0, 1.8.0
>
>
> 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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