org.springframework.batch.core.partition.support

Interface Partitioner

All Known Implementing Classes:

ColumnRangePartitioner, MultiResourcePartitioner, SimplePartitioner

public interface Partitioner

Central strategy interface for creating input parameters for a partitioned step in the form of ExecutionContext instances. The usual aim is to create a set of distinct input values, e.g. a set of non-overlapping primary key ranges, or a set of unique filenames.

Since:

2.0

Author:

Dave Syer

Method Summary

Modifier and Type	Method and Description
java.util.Map<java.lang.String,ExecutionContext>	partition(int gridSize) Create a set of distinct ExecutionContext instances together with a unique identifier for each one.

Method Detail

partition

java.util.Map<java.lang.String,ExecutionContext> partition(int gridSize)

Create a set of distinct ExecutionContext instances together with a unique identifier for each one. The identifiers should be short, mnemonic values, and only have to be unique within the return value (e.g. use an incrementer).

Parameters:

gridSize - the size of the map to return

Returns:

a map from identifier to input parameters