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https://issues.apache.org/jira/browse/KAFKA-16879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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jiandu updated KAFKA-16879:
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Description:
Currently, the {{SystemTime}} class, which provides system time-related
functionalities such as getting the current timestamp 、sleep、and await can be
instantiated multiple times.
Howerver, system time is unique，In an application, the time obtained in
different places should be consistent, But now the time obtained by using the
Java System class to interact with the underlying layer is the same。
So I suggest changing it to a singleton mode， reflect the uniqueness of system
time in design
[https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/common/utils/SystemTime.java|https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/common/utils/SystemTime.java]
was:
Currently, the {{SystemTime}} class, which provides system time-related
functionalities such as getting the current timestamp 、sleep、and await can be
instantiated multiple times.
Howerver, system time is unique，In an application, the time obtained in
different places should be consistent, But now the time obtained by using the
Java System class to interact with the underlying layer is the same。
So I suggest changing it to a singleton mode， reflect the uniqueness of system
time in design
> SystemTime should use singleton mode
> ------------------------------------
>
> Key: KAFKA-16879
> URL: https://issues.apache.org/jira/browse/KAFKA-16879
> Project: Kafka
> Issue Type: Improvement
> Reporter: jiandu
> Priority: Minor
>
> Currently, the {{SystemTime}} class, which provides system time-related
> functionalities such as getting the current timestamp 、sleep、and await can be
> instantiated multiple times.
> Howerver, system time is unique，In an application, the time obtained in
> different places should be consistent, But now the time obtained by using
> the Java System class to interact with the underlying layer is the same。
> So I suggest changing it to a singleton mode， reflect the uniqueness of
> system time in design
>
> [https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/common/utils/SystemTime.java|https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/common/utils/SystemTime.java]
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