| 1 | /* |
| 2 | * Copyright 2006-2007 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.repeat.callback; |
| 18 | |
| 19 | import org.springframework.batch.repeat.ExitStatus; |
| 20 | import org.springframework.batch.repeat.RepeatCallback; |
| 21 | import org.springframework.batch.repeat.RepeatContext; |
| 22 | import org.springframework.batch.repeat.RepeatOperations; |
| 23 | |
| 24 | /** |
| 25 | * Callback that delegates to another callback, via a {@link RepeatOperations} instance. |
| 26 | * Useful when nesting or composing batches in one another, e.g. for breaking a |
| 27 | * batch down into chunks. |
| 28 | * |
| 29 | * @author Dave Syer |
| 30 | * |
| 31 | */ |
| 32 | public class NestedRepeatCallback implements RepeatCallback { |
| 33 | |
| 34 | private RepeatOperations template; |
| 35 | |
| 36 | private RepeatCallback callback; |
| 37 | |
| 38 | /** |
| 39 | * Constructor setting mandatory fields. |
| 40 | * |
| 41 | * @param template the {@link RepeatOperations} to use when calling the delegate |
| 42 | * callback |
| 43 | * @param callback the {@link RepeatCallback} delegate |
| 44 | */ |
| 45 | public NestedRepeatCallback(RepeatOperations template, RepeatCallback callback) { |
| 46 | super(); |
| 47 | this.template = template; |
| 48 | this.callback = callback; |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * Simply calls template.execute(callback). Clients can use this to repeat a |
| 53 | * batch process, or to break a process up into smaller chunks (e.g. to |
| 54 | * change the transaction boundaries). |
| 55 | * |
| 56 | * @see org.springframework.batch.repeat.RepeatCallback#doInIteration(RepeatContext) |
| 57 | */ |
| 58 | public ExitStatus doInIteration(RepeatContext context) throws Exception { |
| 59 | return template.iterate(callback); |
| 60 | } |
| 61 | } |