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 /*
  * 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
  *
  *      http://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;


Interface for listeners to the batch process. Implementers can provide enhance the behaviour of a batch in small cross-cutting modules. The framework provides callbacks at key points in the processing.

Author(s):
Dave Syer
public interface RepeatListener {
Called by the framework before each batch item. Implementers can halt a batch by setting the complete flag on the context.

Parameters:
context the current batch context.
	void before(RepeatContext context);

Called by the framework after each item has been processed, unless the item processing results in an exception. This method is called as soon as the result is known.

Parameters:
context the current batch context
result the result of the callback
	void after(RepeatContext contextRepeatStatus result);

Called once at the start of a complete batch, before any items are processed. Implementers can use this method to acquire any resources that might be needed during processing. Implementers can halt the current operation by setting the complete flag on the context. To halt all enclosing batches (the whole job), the would need to use the parent context (recursively).

Parameters:
context the current batch context
	void open(RepeatContext context);

Called when a repeat callback fails by throwing an exception. There will be one call to this method for each exception thrown during a repeat operation (e.g. a chunk).
There is no need to re-throw the exception here - that will be done by the enclosing framework.

Parameters:
context the current batch context
e the error that was encountered in an item callback.
	void onError(RepeatContext contextThrowable e);

Called once at the end of a complete batch, after normal or abnormal completion (i.e. even after an exception). Implementers can use this method to clean up any resources.

Parameters:
context the current batch context.
	void close(RepeatContext context);
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