spring-retry RetrySynchronizationManager 源码
spring-retry RetrySynchronizationManager 代码
文件路径：/src/main/java/org/springframework/retry/support/RetrySynchronizationManager.java
/*
* Copyright 2006-2022 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.support;
import org.springframework.retry.RetryCallback;
import org.springframework.retry.RetryContext;
import org.springframework.retry.RetryOperations;
/**
* Global variable support for retry clients. Normally it is not necessary for clients to
* be aware of the surrounding environment because a {@link RetryCallback} can always use
* the context it is passed by the enclosing {@link RetryOperations}. But occasionally it
* might be helpful to have lower level access to the ongoing {@link RetryContext} so we
* provide a global accessor here. The mutator methods ({@link #clear()} and
* {@link #register(RetryContext)} should not be used except internally by
* {@link RetryOperations} implementations.
*
* @author Dave Syer
*
*/
public final class RetrySynchronizationManager {
private RetrySynchronizationManager() {
}
private static final ThreadLocal<RetryContext> context = new ThreadLocal<>();
/**
* Public accessor for the locally enclosing {@link RetryContext}.
* @return the current retry context, or null if there isn't one
*/
public static RetryContext getContext() {
RetryContext result = context.get();
return result;
}
/**
* Method for registering a context - should only be used by {@link RetryOperations}
* implementations to ensure that {@link #getContext()} always returns the correct
* value.
* @param context the new context to register
* @return the old context if there was one
*/
public static RetryContext register(RetryContext context) {
RetryContext oldContext = getContext();
RetrySynchronizationManager.context.set(context);
return oldContext;
}
/**
* Clear the current context at the end of a batch - should only be used by
* {@link RetryOperations} implementations.
* @return the old value if there was one.
*/
public static RetryContext clear() {
RetryContext value = getContext();
RetryContext parent = value == null ? null : value.getParent();
RetrySynchronizationManager.context.set(parent);
return value;
}
}
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