spring-retry BackOffPolicy 源码
spring-retry BackOffPolicy 代码
文件路径：/src/main/java/org/springframework/retry/backoff/BackOffPolicy.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.retry.backoff;
import org.springframework.retry.RetryContext;
/**
* Strategy interface to control back off between attempts in a single
* {@link org.springframework.retry.support.RetryTemplate 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 {@link #start} method is called and
* implementations can return an implementation-specific
*
* {@link BackOffContext} that can be used to track state through subsequent back off
* invocations. Each back off process is handled via a call to {@link #backOff}.
*
* The {@link org.springframework.retry.support.RetryTemplate} will pass in the
* corresponding {@link BackOffContext} object created by the call to {@link #start}.
*
* @author Rob Harrop
* @author 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.
* @param context the {@link RetryContext} context, which might contain information
* that we can use to decide how to proceed.
* @return the implementation-specific {@link BackOffContext} or '<code>null</code>'.
*/
BackOffContext start(RetryContext context);
/**
* Back off/pause in an implementation-specific fashion. The passed in
* {@link BackOffContext} corresponds to the one created by the call to {@link #start}
* for a given retry operation set.
* @param backOffContext the {@link BackOffContext}
* @throws BackOffInterruptedException if the attempt at back off is interrupted.
*/
void backOff(BackOffContext backOffContext) throws BackOffInterruptedException;
}
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