public abstract class ReductionCheckedDataReservation<A,E> extends ReductionDataReservation<A,E>
ReductionDataCollector to specify a piece of data it needs to export from the shard.
 This data may, or may not, exist. The ReductionDataCollector need not check while importing/exporting since
 the Reader/Writers handle all checking.| Modifier and Type | Field and Description | 
|---|---|
| protected BooleanSupplier | exists | 
applier, extractor| Modifier | Constructor and Description | 
|---|---|
| protected  | ReductionCheckedDataReservation(A applier,
                               E extractor,
                               BooleanSupplier exists) | 
createReadStream, createWriteStreamprotected final BooleanSupplier exists
protected ReductionCheckedDataReservation(A applier, E extractor, BooleanSupplier exists)
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