Package org.apache.kafka.streams.processor

Provides a low-level programming model (Processor API, aka, PAPI) to express a (stateful) data flow computation over input topics.

See: Description

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).
CommitCallback	Stores can register this callback to be notified upon successful commit.
ConnectedStoreProvider	Provides a set of StoreBuilders that will be automatically added to the topology and connected to the associated processor.
Processor<K,V>	Deprecated Since 3.0.
ProcessorContext	Processor context interface.
ProcessorSupplier<K,V>	Deprecated Since 3.0.
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 a Processor
StandbyUpdateListener
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.
StateStoreContext	State store context interface.
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>	Deprecated Since 3.0.
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 subtopology (aka topicGroupId) plus the assigned partition ID.
TaskMetadata	Deprecated since 3.0, use TaskMetadata instead.
ThreadMetadata	Deprecated since 3.0 use ThreadMetadata instead
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.
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.
StandbyUpdateListener.SuspendReason

Package org.apache.kafka.streams.processor Description

Provides a low-level programming model (Processor API, aka, PAPI) to express a (stateful) data flow computation over input topics. Use Topology as the entry point for your program.