spring BackOff 源码
spring BackOff 代码
文件路径：/spring-core/src/main/java/org/springframework/util/backoff/BackOff.java
/*
* Copyright 2002-2016 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.util.backoff;
/**
* Provide a {@link BackOffExecution} that indicates the rate at which
* an operation should be retried.
*
* <p>Users of this interface are expected to use it like this:
*
* <pre class="code">
* BackOffExecution exec = backOff.start();
*
* // In the operation recovery/retry loop:
* long waitInterval = exec.nextBackOff();
* if (waitInterval == BackOffExecution.STOP) {
* // do not retry operation
* }
* else {
* // sleep, e.g. Thread.sleep(waitInterval)
* // retry operation
* }
* }</pre>
*
* Once the underlying operation has completed successfully,
* the execution instance can be simply discarded.
*
* @author Stephane Nicoll
* @since 4.1
* @see BackOffExecution
*/
@FunctionalInterface
public interface BackOff {
/**
* Start a new back off execution.
* @return a fresh {@link BackOffExecution} ready to be used
*/
BackOffExecution start();
}
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