Package org.apache.storm.state
Interface StateProvider
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- All Known Implementing Classes:
InMemoryKeyValueStateProvider,RedisKeyValueStateProvider
public interface StateProviderUsed by theStateFactoryto create a new state instances.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description StatenewState(String namespace, Map<String,Object> topoConf, TopologyContext context)Returns a new state instance.
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Method Detail
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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.- Parameters:
namespace- a namespace of the statetopoConf- the storm topology configurationcontext- theTopologyContext- Returns:
- a previously saved state if one exists otherwise a newly initialized state.
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