spring-batch NestedRepeatCallback 源码
spring-batch NestedRepeatCallback 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/repeat/callback/NestedRepeatCallback.java
/*
* Copyright 2006-2007 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.batch.repeat.callback;
import org.springframework.batch.repeat.RepeatCallback;
import org.springframework.batch.repeat.RepeatContext;
import org.springframework.batch.repeat.RepeatOperations;
import org.springframework.batch.repeat.RepeatStatus;
/**
* Callback that delegates to another callback, via a {@link RepeatOperations} instance.
* Useful when nesting or composing batches in one another, e.g. for breaking a batch down
* into chunks.
*
* @author Dave Syer
*
*/
public class NestedRepeatCallback implements RepeatCallback {
private RepeatOperations template;
private RepeatCallback callback;
/**
* Constructor setting mandatory fields.
* @param template the {@link RepeatOperations} to use when calling the delegate
* callback
* @param callback the {@link RepeatCallback} delegate
*/
public NestedRepeatCallback(RepeatOperations template, RepeatCallback callback) {
super();
this.template = template;
this.callback = callback;
}
/**
* Simply calls template.execute(callback). Clients can use this to repeat a batch
* process, or to break a process up into smaller chunks (e.g. to change the
* transaction boundaries).
*
* @see org.springframework.batch.repeat.RepeatCallback#doInIteration(RepeatContext)
*/
@Override
public RepeatStatus doInIteration(RepeatContext context) throws Exception {
return template.iterate(callback);
}
}
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