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https://issues.apache.org/jira/browse/FLINK-6053?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Weijie Guo updated FLINK-6053:
------------------------------
Labels: 2.0-related pull-request-available (was: pull-request-available)
> 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: Sub-task
> Components: Runtime / Metrics
> Affects Versions: 1.2.0
> Reporter: Bowen Li
> Priority: Minor
> Labels: 2.0-related, pull-request-available
> Fix For: 2.0.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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