Shubin Ruan created FLINK-27007:
-----------------------------------
Summary: Should the MailboxDefaultAction interface be annotated
with @FunctionalInterface?
Key: FLINK-27007
URL: https://issues.apache.org/jira/browse/FLINK-27007
Project: Flink
Issue Type: Improvement
Components: Runtime / Task
Reporter: Shubin Ruan
When StreamTask initializes mailboxProcessor, it passes in the
MailboxDefaultAction parameter through \{this::processInput}.
{code:java}
this.mailboxProcessor =
new MailboxProcessor(
this::processInput, mailbox, actionExecutor,
numMailsProcessedCounter);{code}
Since the parameter can be passed by Lambda expression, it means that
MailboxDefaultAction is a functional interface, that is, there is only one
unimplemented method. To increase code readability, should the
MailboxDefaultAction interface be annotated with @FunctionalInterface? should
the MailboxDefaultAction interface be annotated with @FunctionalInterface?
{code:java}
@Internal
@FunctionalInterface
public interface MailboxDefaultAction {
...
} {code}
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