1 /*
2 * Copyright 2006-2013 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.springframework.batch.core.partition.support;
18
19 import java.util.HashMap;
20 import java.util.Map;
21
22 import org.springframework.batch.item.ExecutionContext;
23
24 /**
25 * Simplest possible implementation of {@link Partitioner}. Just creates a set
26 * of empty {@link ExecutionContext} instances, and labels them as
27 * <code>{partition0, partition1, ..., partitionN}</code>, where <code>N</code> is the grid
28 * size.
29 *
30 * @author Dave Syer
31 * @since 2.0
32 */
33 public class SimplePartitioner implements Partitioner {
34
35 private static final String PARTITION_KEY = "partition";
36
37 @Override
38 public Map<String, ExecutionContext> partition(int gridSize) {
39 Map<String, ExecutionContext> map = new HashMap<String, ExecutionContext>(gridSize);
40 for (int i = 0; i < gridSize; i++) {
41 map.put(PARTITION_KEY + i, new ExecutionContext());
42 }
43 return map;
44 }
45
46 }