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https://issues.apache.org/jira/browse/LOG4J2-1797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15884153#comment-15884153
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Matt Sicker commented on LOG4J2-1797:
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I found a potentially useful interface already in Java for a callback:
[CompletionHandler|https://docs.oracle.com/javase/8/docs/api/java/nio/channels/CompletionHandler.html].
> Add asynchronous/non-blocking SPIs for appenders
> ------------------------------------------------
>
> Key: LOG4J2-1797
> URL: https://issues.apache.org/jira/browse/LOG4J2-1797
> Project: Log4j 2
> Issue Type: Improvement
> Components: Appenders
> Reporter: Matt Sicker
>
> Some appenders (e.g., Kafka and Cassandra) support using an asynchronous SPI
> with callbacks (to make them non-blocking). In a Scala-based API, this could
> be easily handled with the Future class, and with Java 8, this could be
> easily handled with a CompleteableFuture class. However, if this API
> improvement is desired for Java 7, then we'd need to create a basic callback
> API that would ideally be easy to update to CompleteableFuture later on.
> In theory, such an SPI could also be adapted to use the Flow classes in Java
> 9. This may be an interesting API to follow as we could use the Reactive
> Streams standard API or a compatible API.
> Some main things that would be desirable in such an SPI would include
> asynchronous error handling (e.g., to trigger a failover appender). This
> should be adapted to work well with the generic AsyncAppender and AsyncLogger
> as well.
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