spring-retry RetryState 源码
spring-retry RetryState 代码
文件路径：/src/main/java/org/springframework/retry/RetryState.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;
/**
* Stateful retry is characterised by having to recognise the items that are being
* processed, so this interface is used primarily to provide a cache key in between failed
* attempts. It also provides a hints to the {@link RetryOperations} for optimisations to
* do with avoidable cache hits and switching to stateless retry if a rollback is not
* needed.
*
* @author Dave Syer
*
*/
public interface RetryState {
/**
* Key representing the state for a retry attempt. Stateful retry is characterised by
* having to recognise the items that are being processed, so this value is used as a
* cache key in between failed attempts.
* @return the key that this state represents
*/
Object getKey();
/**
* Indicate whether a cache lookup can be avoided. If the key is known ahead of the
* retry attempt to be fresh (i.e. has never been seen before) then a cache lookup can
* be avoided if this flag is true.
* @return true if the state does not require an explicit check for the key
*/
boolean isForceRefresh();
/**
* Check whether this exception requires a rollback. The default is always true, which
* is conservative, so this method provides an optimisation for switching to stateless
* retry if there is an exception for which rollback is unnecessary. Example usage
* would be for a stateful retry to specify a validation exception as not for
* rollback.
* @param exception the exception that caused a retry attempt to fail
* @return true if this exception should cause a rollback
*/
boolean rollbackFor(Throwable exception);
}
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