001/* 002 * Copyright 2006-2013 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.batch.core.partition.support; 018 019import java.util.HashMap; 020import java.util.Map; 021 022import org.springframework.batch.item.ExecutionContext; 023 024/** 025 * Simplest possible implementation of {@link Partitioner}. Just creates a set 026 * of empty {@link ExecutionContext} instances, and labels them as 027 * <code>{partition0, partition1, ..., partitionN}</code>, where <code>N</code> is the grid 028 * size. 029 * 030 * @author Dave Syer 031 * @since 2.0 032 */ 033public class SimplePartitioner implements Partitioner { 034 035 private static final String PARTITION_KEY = "partition"; 036 037 @Override 038 public Map<String, ExecutionContext> partition(int gridSize) { 039 Map<String, ExecutionContext> map = new HashMap<String, ExecutionContext>(gridSize); 040 for (int i = 0; i < gridSize; i++) { 041 map.put(PARTITION_KEY + i, new ExecutionContext()); 042 } 043 return map; 044 } 045 046}