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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.backoff;
Simple base class for BackOffPolicy implementations that maintain no state across invocations.

Rob Harrop
Dave Syer
public abstract class StatelessBackOffPolicy implements BackOffPolicy {

Delegates directly to the doBackOff() method without passing on the BackOffContext argument which is not needed for stateless implementations.
	public final void backOff(BackOffContext backOffContextthrows BackOffInterruptedException {

Returns 'null'. Subclasses can add behaviour, e.g. initial sleep before first attempt.
	public BackOffContext start(RetryContext status) {
		return null;

Sub-classes should implement this method to perform the actual back off.
	protected abstract void doBackOff() throws BackOffInterruptedException;
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