Package org.apache.kafka.streams.kstream

Interface Summary

Interface	Description
Aggregator<K,V,VA>	The Aggregator interface for aggregating values of the given key.
ForeachAction<K,V>	The ForeachAction interface for performing an action on a key-value pair.
GlobalKTable<K,V>	GlobalKTable is an abstraction of a changelog stream from a primary-keyed table.
Initializer<VA>	The Initializer interface for creating an initial value in aggregations.
KeyValueMapper<K,V,VR>	The KeyValueMapper interface for mapping a key-value pair to a new value of arbitrary type.
KGroupedStream<K,V>	KGroupedStream is an abstraction of a grouped record stream of KeyValue pairs.
KGroupedTable<K,V>	KGroupedTable is an abstraction of a re-grouped changelog stream from a primary-keyed table, usually on a different grouping key than the original primary key.
KStream<K,V>	KStream is an abstraction of a record stream of KeyValue pairs, i.e., each record is an independent entity/event in the real world.
KTable<K,V>	KTable is an abstraction of a changelog stream from a primary-keyed table.
Merger<K,V>	The interface for merging aggregate values for SessionWindows with the given key.
Predicate<K,V>	The Predicate interface represents a predicate (boolean-valued function) of a KeyValue pair.
Reducer<V>	The Reducer interface for combining two values of the same type into a new value.
SessionWindowedKStream<K,V>	SessionWindowedKStream is an abstraction of a windowed record stream of KeyValue pairs.
TimeWindowedKStream<K,V>	TimeWindowedKStream is an abstraction of a windowed record stream of KeyValue pairs.
Transformer<K,V,R>	The Transformer interface for stateful mapping of an input record to zero, one, or multiple new output records (both key and value type can be altered arbitrarily).
TransformerSupplier<K,V,R>	A TransformerSupplier interface which can create one or more Transformer instances.
ValueJoiner<V1,V2,VR>	The ValueJoiner interface for joining two values into a new value of arbitrary type.
ValueMapper<V,VR>	The ValueMapper interface for mapping a value to a new value of arbitrary type.
ValueTransformer<V,VR>	The ValueTransformer interface for stateful mapping of a value to a new value (with possible new type).
ValueTransformerSupplier<V,VR>	A ValueTransformerSupplier interface which can create one or more ValueTransformer instances.

Class Summary

Class	Description
Joined<K,V,VO>	The Joined class represents optional params that can be passed to KStream.join(org.apache.kafka.streams.kstream.KStream<K, VO>, org.apache.kafka.streams.kstream.ValueJoiner<? super V, ? super VO, ? extends VR>, org.apache.kafka.streams.kstream.JoinWindows), KStream.leftJoin(org.apache.kafka.streams.kstream.KStream<K, VO>, org.apache.kafka.streams.kstream.ValueJoiner<? super V, ? super VO, ? extends VR>, org.apache.kafka.streams.kstream.JoinWindows), and KStream.outerJoin(org.apache.kafka.streams.kstream.KStream<K, VO>, org.apache.kafka.streams.kstream.ValueJoiner<? super V, ? super VO, ? extends VR>, org.apache.kafka.streams.kstream.JoinWindows) operations.
JoinWindows	The window specifications used for joins.
KStreamBuilder	Deprecated Use StreamsBuilder instead
Materialized<K,V,S extends StateStore>	Used to describe how a StateStore should be materialized.
Printed<K,V>	An object to define the options used when printing a KStream.
Produced<K,V>	This class is used to provide the optional parameters when producing to new topics using KStream.through(String, Produced) or KStream.to(String, Produced).
Serialized<K,V>	The class that is used to capture the key and value Serdes used when performing KStream.groupBy(KeyValueMapper, Serialized) and KStream.groupByKey(Serialized) operations.
SessionWindows	A session based window specification used for aggregating events into sessions.
TimeWindows	The fixed-size time-based window specifications used for aggregations.
UnlimitedWindows	The unlimited window specifications used for aggregations.
Window	A single window instance, defined by its start and end timestamp.
Windowed<K>	The result key type of a windowed stream aggregation.
Windows<W extends Window>	The window specification interface for fixed size windows that is used to define window boundaries and window maintain duration.