org.apache.storm.hooks

## Interface IWorkerHook

- All Superinterfaces:
    Serializable
  All Known Implementing Classes:
    BaseWorkerHook

      public interface IWorkerHook
      extends Serializable

  An IWorkerHook represents a topology component that can be executed when a worker starts, and when a worker shuts down. It can be useful when you want to execute operations before topology processing starts, or cleanup operations before your workers shut down.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `shutdown()` This method is called right before a worker shuts down.
    `void` | `start(Map<String,Object> topoConf, WorkerTopologyContext context)` This method is called when a worker is started.

- - ### Method Detail

    - #### start

          void start(Map<String,Object> topoConf,
                     WorkerTopologyContext context)

      This method is called when a worker is started.

      Parameters:
        `topoConf` - The Storm configuration for this worker
        `context` - This object can be used to get information about this worker’s place within the topology

    - #### shutdown

          void shutdown()

      This method is called right before a worker shuts down.

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