Package org.zalando.nakadiproducer.eventlog

Interface CompactionKeyExtractor<X>

Type Parameters:

X - The (Java) type of objects for which the compaction key will be computed.

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface CompactionKeyExtractor<X>

This is a functional interface to be implemented by applications which want to produce compacted events. In many cases it's possible to implement this with a method reference to a getter (like Order::getNumber), in more complex cases it's usually still possible as a one-line Lambda.

See Also:

EventLogWriter.registerCompactionKeyExtractor(String, Class, CompactionKeyExtractor)

Method Summary

Modifier and Type	Method	Description
String	getCompactionKeyFor(X data)	Extracts a compaction key of a data object.

Method Detail

getCompactionKeyFor

String getCompactionKeyFor(X data)

Extracts a compaction key of a data object.

Parameters:

data - The data/payload to be sent in the event.

Returns:

the compaction key to be written in the metadata.