Interface StateProvider

All Known Implementing Classes:
InMemoryKeyValueStateProvider, RedisKeyValueStateProvider

public interface StateProvider
Used by the StateFactory to create a new state instances.
  • Method Details

    • newState

      State newState(String namespace, Map<String,Object> topoConf, TopologyContext context)
      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.
      namespace - a namespace of the state
      topoConf - the storm topology configuration
      context - the TopologyContext
      a previously saved state if one exists otherwise a newly initialized state.