THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
...
Code Block |
---|
public interface StateStoreContext { ... /** * Return the metadata of the current recordtopic/partition/offset if available. Processors may be invoked to * processThis ametadata source record from an input topic, to run in a scheduledStateStore punctuation is * (see {@link org.apache.kafka.streams.processor.api.ProcessorContext#schedule(Duration, PunctuationType, Punctuator)}), * or because a parent processor called {@link org.apache.kafka.streams.processor.api.ProcessorContext#forward(Record)}. * <p> * In the case of a punctuation, there is no source record, so this metadata would bedefined as the metadata of the record * undefined. Note that when a punctuator invokes {@link ProcessorContext#forward(Record)}, * downstream processors will receive the forwarded record as a regular * {@link Processor#process(Record)} invocation. In other words, it wouldn't be apparent to * downstream processors whether or not the record is currently being processed cameby fromthe anStreamTask input topic * or punctuation and therefore whether or not this metadata is defined. This is why * the return type of this method is {@link Optional}that holds the store. * <p> * If there is any possibility of punctuators upstream, any access * to this field should consider the case of * "<code>recordMetadata().isPresent() == false</code>".Note that the metadata is not defined during all store interactions, for * Of courseexample, itwhile wouldthe beStreamTask safestis torunning always guard this conditiona punctuation. */ Optional<RecordMetadata> Optional<RecordMetadata> recordMetadata(); ... } |
Compatibility, Deprecation, and Migration Plan
...