# Package org.apache.storm.streams

- Class Summary
  Class | Description
  --- | ---
  Pair<T1,​T2> | A pair of values.
  PairStream<K,​V> | Represents a stream of key-value pairs.
  ProcessorNode | Node that wraps a processor in the stream.
  RefCountedTuple | Provides reference counting of tuples.
  Stream<T> | Represents a stream of values.
  StreamBuilder | A builder for constructing a `StormTopology` via storm streams api (DSL).
  StreamState<K,​V> | A wrapper for the stream state which can be used to query the state via `Stream.stateQuery(StreamState)`.
  StreamUtil |
  WindowNode | Node that captures the windowing configurations.