org.apache.storm.state

## Class InMemoryKeyValueStateProvider

- java.lang.Object
- - org.apache.storm.state.InMemoryKeyValueStateProvider

- All Implemented Interfaces:
    StateProvider

      public class InMemoryKeyValueStateProvider
      extends Object
      implements StateProvider

  Provides `InMemoryKeyValueState`.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `InMemoryKeyValueStateProvider()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `State` | `newState(String namespace, Map<String,Object> topoConf, TopologyContext context)` Returns a new state instance.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### InMemoryKeyValueStateProvider

          public InMemoryKeyValueStateProvider()

  - ### Method Detail

    - #### newState

          public State newState(String namespace,
                                Map<String,Object> topoConf,
                                TopologyContext context)

      Description copied from interface: `StateProvider`

      Returns a new state instance. Each state belongs unique namespace which is typically the componentid-task of the task, so that each task can have its own unique state.

      Specified by:
        `newState` in interface `StateProvider`
      Parameters:
        `namespace` - a namespace of the state
        `topoConf` - the storm topology configuration
        `context` - the `TopologyContext`
      Returns:
        a previously saved state if one exists otherwise a newly initialized state.

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