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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.retry.backoff;
Strategy interface to control back off between attempts in a single retry operation.

Implementations are expected to be thread-safe and should be designed for concurrent access. Configuration for each implementation is also expected to be thread-safe but need not be suitable for high load concurrent access.

For each block of retry operations the start(org.springframework.batch.retry.RetryContext) method is called and implementations can return an implementation-specific BackOffContext that can be used to track state through subsequent back off invocations.

Each back off process is handled via a call to backOff(org.springframework.batch.retry.backoff.BackOffContext). The org.springframework.batch.retry.support.RetryTemplate will pass in the corresponding BackOffContext object created by the call to start(org.springframework.batch.retry.RetryContext).

Author(s):
Rob Harrop
Dave Syer
public interface BackOffPolicy {

Start a new block of back off operations. Implementations can choose to pause when this method is called, but normally it returns immediately.

Parameters:
context the current retry context, which might contain information that we can use to decide how to proceed.
Returns:
the implementation-specific BackOffContext or 'null'.
Back off/pause in an implementation-specific fashion. The passed in BackOffContext corresponds to the one created by the call to start(org.springframework.batch.retry.RetryContext) for a given retry operation set.

Throws:
BackOffInterruptedException if the attempt at back off is interrupted.
	void backOff(BackOffContext backOffContextthrows BackOffInterruptedException;
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