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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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.springframework.batch.retry;

A RetryPolicy is responsible for allocating and managing resources needed by RetryOperations. The RetryPolicy allows retry operations to be aware of their context. Context can be internal to the retry framework, e.g. to support nested retries. Context can also be external, and the RetryPolicy provides a uniform API for a range of different platforms for the external context.

Dave Syer
public interface RetryPolicy {

context the current retry status
true if the operation can proceed
	boolean canRetry(RetryContext context);

Acquire resources needed for the retry operation. The callback is passed in so that marker interfaces can be used and a manager can collaborate with the callback to set up some state in the status token.

parent the parent context if we are in a nested retry.
a RetryContext object specific to this manager.

context a retry status created by the open(org.springframework.batch.retry.RetryContext) method of this manager.
	void close(RetryContext context);

Called once per retry attempt, after the callback fails.

context the current status object.
	void registerThrowable(RetryContext contextThrowable throwable);
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