org.apache.storm.topology

## Interface IWindowedBolt

- All Superinterfaces:
    IComponent, Serializable
  All Known Subinterfaces:
    IStatefulWindowedBolt<T>
  All Known Implementing Classes:
    BaseStatefulWindowedBolt, BaseWindowedBolt, JoinBolt, SlidingWindowSumBolt, TestWindowBolt, TimeDataVerificationBolt, VerificationBolt

      public interface IWindowedBolt
      extends IComponent

  A bolt abstraction for supporting time and count based sliding & tumbling windows.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `cleanup()`
    `void` | `execute(TupleWindow inputWindow)` Process the tuple window and optionally emit new tuples based on the tuples in the input window.
    `TimestampExtractor` | `getTimestampExtractor()` Return a `TimestampExtractor` for extracting timestamps from a tuple for event time based processing, or null for processing time.
    `void` | `prepare(Map<String,Object> topoConf, TopologyContext context, OutputCollector collector)` This is similar to the `IBolt.prepare(Map, TopologyContext, OutputCollector)` except that while emitting, the tuples are automatically anchored to the tuples in the inputWindow.

    - ### Methods inherited from interface org.apache.storm.topology.IComponent

      `declareOutputFields, getComponentConfiguration`

- - ### Method Detail

    - #### prepare

          void prepare(Map<String,Object> topoConf,
                       TopologyContext context,
                       OutputCollector collector)

      This is similar to the `IBolt.prepare(Map, TopologyContext, OutputCollector)` except that while emitting, the tuples are automatically anchored to the tuples in the inputWindow.

    - #### execute

          void execute(TupleWindow inputWindow)

      Process the tuple window and optionally emit new tuples based on the tuples in the input window.

    - #### cleanup

          void cleanup()

    - #### getTimestampExtractor

          TimestampExtractor getTimestampExtractor()

      Return a `TimestampExtractor` for extracting timestamps from a tuple for event time based processing, or null for processing time.

      Returns:
        the timestamp extractor

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