Package org.apache.kafka.streams.processor

Interface Summary

Interface	Description
BatchingStateRestoreCallback	Interface for batching restoration of a StateStore It is expected that implementations of this class will not call the StateRestoreCallback.restore(byte[], byte[]) method.
Cancellable	Cancellable interface returned in ProcessorContext.schedule(Duration, PunctuationType, Punctuator).
ConnectedStoreProvider	Provides a set of StoreBuilders that will be automatically added to the topology and connected to the associated processor.
PartitionGrouper	Deprecated since 2.4 release; will be removed in 3.0.0 via KAFKA-7785
Processor<K,V>	A processor of key-value pair records.
ProcessorContext	Processor context interface.
ProcessorSupplier<K,V>	A processor supplier that can create one or more Processor instances.
Punctuator	A functional interface used as an argument to ProcessorContext.schedule(Duration, PunctuationType, Punctuator).
RecordContext	The context associated with the current record being processed by an Processor
StateRestoreCallback	Restoration logic for log-backed state stores upon restart, it takes one record at a time from the logs to apply to the restoring state.
StateRestoreListener	Class for listening to various states of the restoration process of a StateStore.
StateStore	A storage engine for managing state maintained by a stream processor.
StreamPartitioner<K,V>	Determine how records are distributed among the partitions in a Kafka topic.
TimestampExtractor	An interface that allows the Kafka Streams framework to extract a timestamp from an instance of ConsumerRecord.
TopicNameExtractor<K,V>	An interface that allows to dynamically determine the name of the Kafka topic to send at the sink node of the topology.

Class Summary

Class	Description
AbstractProcessor<K,V>	An abstract implementation of Processor that manages the ProcessorContext instance and provides default no-op implementation of AbstractProcessor.close().
DefaultPartitionGrouper	Deprecated since 2.4 release; will be removed in 3.0.0 via KAFKA-7785
FailOnInvalidTimestamp	Retrieves embedded metadata timestamps from Kafka messages.
LogAndSkipOnInvalidTimestamp	Retrieves embedded metadata timestamps from Kafka messages.
MockProcessorContext	MockProcessorContext is a mock of ProcessorContext for users to test their Processor, Transformer, and ValueTransformer implementations.
MockProcessorContext.CapturedForward
MockProcessorContext.CapturedPunctuator	MockProcessorContext.CapturedPunctuator holds captured punctuators, along with their scheduling information.
TaskId	The task ID representation composed as topic group ID plus the assigned partition ID.
TaskMetadata	Represents the state of a single task running within a KafkaStreams application.
ThreadMetadata	Represents the state of a single thread running within a KafkaStreams application.
To	This class is used to provide the optional parameters when sending output records to downstream processor using ProcessorContext.forward(Object, Object, To).
UsePartitionTimeOnInvalidTimestamp	Retrieves embedded metadata timestamps from Kafka messages.
UsePreviousTimeOnInvalidTimestamp	Deprecated since 2.5.
WallclockTimestampExtractor	Retrieves current wall clock timestamps as System.currentTimeMillis().

Enum Summary

Enum	Description
PunctuationType	Controls what notion of time is used for punctuation scheduled via ProcessorContext.schedule(Duration, PunctuationType, Punctuator) schedule}: STREAM_TIME - uses "stream time", which is advanced by the processing of messages in accordance with the timestamp as extracted by the TimestampExtractor in use.