MapReducerAggStateUpdater (Storm 2.7.1 API)

java.lang.Object
- org.apache.storm.trident.state.map.MapReducerAggStateUpdater

All Implemented Interfaces:

Serializable, Operation, StateUpdater<MapState>
```
public class MapReducerAggStateUpdater
extends Object
implements StateUpdater<MapState>
```
See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

MapReducerAggStateUpdater(ReducerAggregator agg, Fields groupFields, Fields inputFields)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`cleanup()`	When running in local mode, called when the local cluster is being shut down.
`void`	`prepare(Map<String,Object> conf, TridentOperationContext context)`	Called when the `Operation` is first initialized.
`void`	`updateState(MapState map, List<TridentTuple> tuples, TridentCollector collector)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - MapReducerAggStateUpdater
```
public MapReducerAggStateUpdater(ReducerAggregator agg,
                                 Fields groupFields,
                                 Fields inputFields)
```
- Method Detail
  - updateState
```
public void updateState(MapState map,
                        List<TridentTuple> tuples,
                        TridentCollector collector)
```
    Specified by:
    
    updateState in interface StateUpdater<MapState>
  - prepare
```
public void prepare(Map<String,Object> conf,
                    TridentOperationContext context)
```
    Description copied from interface: Operation
    
    Called when the `Operation` is first initialized.
    
    Specified by:
    
    prepare in interface Operation
    
    Parameters:
    
    conf - the Storm configuration map
    
    context - the operation context which provides information such as the number of partitions in the stream, and the current partition index. It also provides methods for registering operation-specific metrics.
    
    See Also:
    
    TridentOperationContext
  - cleanup
```
public void cleanup()
```
    Description copied from interface: Operation
    
    When running in local mode, called when the local cluster is being shut down.
    
    Specified by:
    
    cleanup in interface Operation